FlatCAM/flatcamParsers/ParseGerber.py

from camlib import Geometry, ApertureMacro, parse_gerber_number, arc, arctan2, arc_angle
import FlatCAMApp
import FlatCAMTranslation as fcTranslate

from shapely.geometry import Polygon, Point, LineString, MultiPolygon
from shapely.ops import cascaded_union
import shapely.affinity as affinity
from shapely.geometry import box as shply_box
import re
import traceback
from copy import deepcopy

import gettext
import builtins

import numpy as np
from numpy import Inf
from math import sqrt, pi, sin, cos
import sys

import logging

if '_' not in builtins.__dict__:
    _ = gettext.gettext

log = logging.getLogger('base2')
log.setLevel(logging.DEBUG)

formatter = logging.Formatter('[%(levelname)s] %(message)s')
handler = logging.StreamHandler()
handler.setFormatter(formatter)
log.addHandler(handler)

class Gerber(Geometry):
    """
    Here it is done all the Gerber parsing.

    **ATTRIBUTES**

    * ``apertures`` (dict): The keys are names/identifiers of each aperture.
      The values are dictionaries key/value pairs which describe the aperture. The
      type key is always present and the rest depend on the key:

    +-----------+-----------------------------------+
    | Key       | Value                             |
    +===========+===================================+
    | type      | (str) "C", "R", "O", "P", or "AP" |
    +-----------+-----------------------------------+
    | others    | Depend on ``type``                |
    +-----------+-----------------------------------+
    | solid_geometry      | (list)                  |
    +-----------+-----------------------------------+
    * ``aperture_macros`` (dictionary): Are predefined geometrical structures
      that can be instantiated with different parameters in an aperture
      definition. See ``apertures`` above. The key is the name of the macro,
      and the macro itself, the value, is a ``Aperture_Macro`` object.

    * ``flash_geometry`` (list): List of (Shapely) geometric object resulting
      from ``flashes``. These are generated from ``flashes`` in ``do_flashes()``.

    * ``buffered_paths`` (list): List of (Shapely) polygons resulting from
      *buffering* (or thickening) the ``paths`` with the aperture. These are
      generated from ``paths`` in ``buffer_paths()``.

    **USAGE**::

        g = Gerber()
        g.parse_file(filename)
        g.create_geometry()
        do_something(s.solid_geometry)

    """

    # defaults = {
    #     "steps_per_circle": 128,
    #     "use_buffer_for_union": True
    # }

    def __init__(self, steps_per_circle=None):
        """
        The constructor takes no parameters. Use ``gerber.parse_files()``
        or ``gerber.parse_lines()`` to populate the object from Gerber source.

        :return: Gerber object
        :rtype: Gerber
        """

        # How to approximate a circle with lines.
        self.steps_per_circle = int(self.app.defaults["gerber_circle_steps"])

        # Initialize parent
        Geometry.__init__(self, geo_steps_per_circle=int(self.app.defaults["gerber_circle_steps"]))

        # Number format
        self.int_digits = 3
        """Number of integer digits in Gerber numbers. Used during parsing."""

        self.frac_digits = 4
        """Number of fraction digits in Gerber numbers. Used during parsing."""

        self.gerber_zeros = self.app.defaults['gerber_def_zeros']
        """Zeros in Gerber numbers. If 'L' then remove leading zeros, if 'T' remove trailing zeros. Used during parsing.
        """

        # ## Gerber elements # ##
        '''
        apertures = {
            'id':{
                'type':string, 
                'size':float, 
                'width':float,
                'height':float,
                'geometry': [],
            }
        }
        apertures['geometry'] list elements are dicts
        dict = {
            'solid': [],
            'follow': [],
            'clear': []
        }
        '''

        # store the file units here:
        self.gerber_units = self.app.defaults['gerber_def_units']

        # aperture storage
        self.apertures = {}

        # Aperture Macros
        self.aperture_macros = {}

        # will store the Gerber geometry's as solids
        self.solid_geometry = Polygon()

        # will store the Gerber geometry's as paths
        self.follow_geometry = []

        # made True when the LPC command is encountered in Gerber parsing
        # it allows adding data into the clear_geometry key of the self.apertures[aperture] dict
        self.is_lpc = False

        self.source_file = ''

        # Attributes to be included in serialization
        # Always append to it because it carries contents
        # from Geometry.
        self.ser_attrs += ['int_digits', 'frac_digits', 'apertures',
                           'aperture_macros', 'solid_geometry', 'source_file']

        # ### Parser patterns ## ##
        # FS - Format Specification
        # The format of X and Y must be the same!
        # L-omit leading zeros, T-omit trailing zeros, D-no zero supression
        # A-absolute notation, I-incremental notation
        self.fmt_re = re.compile(r'%?FS([LTD])?([AI])X(\d)(\d)Y\d\d\*%?$')
        self.fmt_re_alt = re.compile(r'%FS([LTD])?([AI])X(\d)(\d)Y\d\d\*MO(IN|MM)\*%$')
        self.fmt_re_orcad = re.compile(r'(G\d+)*\**%FS([LTD])?([AI]).*X(\d)(\d)Y\d\d\*%$')

        # Mode (IN/MM)
        self.mode_re = re.compile(r'^%?MO(IN|MM)\*%?$')

        # Comment G04|G4
        self.comm_re = re.compile(r'^G0?4(.*)$')

        # AD - Aperture definition
        # Aperture Macro names: Name = [a-zA-Z_.$]{[a-zA-Z_.0-9]+}
        # NOTE: Adding "-" to support output from Upverter.
        self.ad_re = re.compile(r'^%ADD(\d\d+)([a-zA-Z_$\.][a-zA-Z0-9_$\.\-]*)(?:,(.*))?\*%$')

        # AM - Aperture Macro
        # Beginning of macro (Ends with *%):
        # self.am_re = re.compile(r'^%AM([a-zA-Z0-9]*)\*')

        # Tool change
        # May begin with G54 but that is deprecated
        self.tool_re = re.compile(r'^(?:G54)?D(\d\d+)\*$')

        # G01... - Linear interpolation plus flashes with coordinates
        # Operation code (D0x) missing is deprecated... oh well I will support it.
        self.lin_re = re.compile(r'^(?:G0?(1))?(?=.*X([\+-]?\d+))?(?=.*Y([\+-]?\d+))?[XY][^DIJ]*(?:D0?([123]))?\*$')

        # Operation code alone, usually just D03 (Flash)
        self.opcode_re = re.compile(r'^D0?([123])\*$')

        # G02/3... - Circular interpolation with coordinates
        # 2-clockwise, 3-counterclockwise
        # Operation code (D0x) missing is deprecated... oh well I will support it.
        # Optional start with G02 or G03, optional end with D01 or D02 with
        # optional coordinates but at least one in any order.
        self.circ_re = re.compile(r'^(?:G0?([23]))?(?=.*X([\+-]?\d+))?(?=.*Y([\+-]?\d+))' +
                                  '?(?=.*I([\+-]?\d+))?(?=.*J([\+-]?\d+))?[XYIJ][^D]*(?:D0([12]))?\*$')

        # G01/2/3 Occurring without coordinates
        self.interp_re = re.compile(r'^(?:G0?([123]))\*')

        # Single G74 or multi G75 quadrant for circular interpolation
        self.quad_re = re.compile(r'^G7([45]).*\*$')

        # Region mode on
        # In region mode, D01 starts a region
        # and D02 ends it. A new region can be started again
        # with D01. All contours must be closed before
        # D02 or G37.
        self.regionon_re = re.compile(r'^G36\*$')

        # Region mode off
        # Will end a region and come off region mode.
        # All contours must be closed before D02 or G37.
        self.regionoff_re = re.compile(r'^G37\*$')

        # End of file
        self.eof_re = re.compile(r'^M02\*')

        # IP - Image polarity
        self.pol_re = re.compile(r'^%?IP(POS|NEG)\*%?$')

        # LP - Level polarity
        self.lpol_re = re.compile(r'^%LP([DC])\*%$')

        # Units (OBSOLETE)
        self.units_re = re.compile(r'^G7([01])\*$')

        # Absolute/Relative G90/1 (OBSOLETE)
        self.absrel_re = re.compile(r'^G9([01])\*$')

        # Aperture macros
        self.am1_re = re.compile(r'^%AM([^\*]+)\*([^%]+)?(%)?$')
        self.am2_re = re.compile(r'(.*)%$')

        self.use_buffer_for_union = self.app.defaults["gerber_use_buffer_for_union"]

    def aperture_parse(self, apertureId, apertureType, apParameters):
        """
        Parse gerber aperture definition into dictionary of apertures.
        The following kinds and their attributes are supported:

        * *Circular (C)*: size (float)
        * *Rectangle (R)*: width (float), height (float)
        * *Obround (O)*: width (float), height (float).
        * *Polygon (P)*: diameter(float), vertices(int), [rotation(float)]
        * *Aperture Macro (AM)*: macro (ApertureMacro), modifiers (list)

        :param apertureId: Id of the aperture being defined.
        :param apertureType: Type of the aperture.
        :param apParameters: Parameters of the aperture.
        :type apertureId: str
        :type apertureType: str
        :type apParameters: str
        :return: Identifier of the aperture.
        :rtype: str
        """
        if self.app.abort_flag:
            # graceful abort requested by the user
            raise FlatCAMApp.GracefulException

        # Found some Gerber with a leading zero in the aperture id and the
        # referenced it without the zero, so this is a hack to handle that.
        apid = str(int(apertureId))

        try:  # Could be empty for aperture macros
            paramList = apParameters.split('X')
        except:
            paramList = None

        if apertureType == "C":  # Circle, example: %ADD11C,0.1*%
            self.apertures[apid] = {"type": "C",
                                    "size": float(paramList[0])}
            return apid

        if apertureType == "R":  # Rectangle, example: %ADD15R,0.05X0.12*%
            self.apertures[apid] = {"type": "R",
                                    "width": float(paramList[0]),
                                    "height": float(paramList[1]),
                                    "size": sqrt(float(paramList[0]) ** 2 + float(paramList[1]) ** 2)}  # Hack
            return apid

        if apertureType == "O":  # Obround
            self.apertures[apid] = {"type": "O",
                                    "width": float(paramList[0]),
                                    "height": float(paramList[1]),
                                    "size": sqrt(float(paramList[0]) ** 2 + float(paramList[1]) ** 2)}  # Hack
            return apid

        if apertureType == "P":  # Polygon (regular)
            self.apertures[apid] = {"type": "P",
                                    "diam": float(paramList[0]),
                                    "nVertices": int(paramList[1]),
                                    "size": float(paramList[0])}  # Hack
            if len(paramList) >= 3:
                self.apertures[apid]["rotation"] = float(paramList[2])
            return apid

        if apertureType in self.aperture_macros:
            self.apertures[apid] = {"type": "AM",
                                    "macro": self.aperture_macros[apertureType],
                                    "modifiers": paramList}
            return apid

        log.warning("Aperture not implemented: %s" % str(apertureType))
        return None

    def parse_file(self, filename, follow=False):
        """
        Calls Gerber.parse_lines() with generator of lines
        read from the given file. Will split the lines if multiple
        statements are found in a single original line.

        The following line is split into two::

            G54D11*G36*

        First is ``G54D11*`` and seconds is ``G36*``.

        :param filename: Gerber file to parse.
        :type filename: str
        :param follow: If true, will not create polygons, just lines
            following the gerber path.
        :type follow: bool
        :return: None
        """

        with open(filename, 'r') as gfile:

            def line_generator():
                for line in gfile:
                    line = line.strip(' \r\n')
                    while len(line) > 0:

                        # If ends with '%' leave as is.
                        if line[-1] == '%':
                            yield line
                            break

                        # Split after '*' if any.
                        starpos = line.find('*')
                        if starpos > -1:
                            cleanline = line[:starpos + 1]
                            yield cleanline
                            line = line[starpos + 1:]

                        # Otherwise leave as is.
                        else:
                            # yield clean line
                            yield line
                            break

            processed_lines = list(line_generator())
            self.parse_lines(processed_lines)

    # @profile
    def parse_lines(self, glines):
        """
        Main Gerber parser. Reads Gerber and populates ``self.paths``, ``self.apertures``,
        ``self.flashes``, ``self.regions`` and ``self.units``.

        :param glines: Gerber code as list of strings, each element being
            one line of the source file.
        :type glines: list
        :return: None
        :rtype: None
        """

        # Coordinates of the current path, each is [x, y]
        path = []

        # this is for temporary storage of solid geometry until it is added to poly_buffer
        geo_s = None

        # this is for temporary storage of follow geometry until it is added to follow_buffer
        geo_f = None

        # Polygons are stored here until there is a change in polarity.
        # Only then they are combined via cascaded_union and added or
        # subtracted from solid_geometry. This is ~100 times faster than
        # applying a union for every new polygon.
        poly_buffer = []

        # store here the follow geometry
        follow_buffer = []

        last_path_aperture = None
        current_aperture = None

        # 1,2 or 3 from "G01", "G02" or "G03"
        current_interpolation_mode = None

        # 1 or 2 from "D01" or "D02"
        # Note this is to support deprecated Gerber not putting
        # an operation code at the end of every coordinate line.
        current_operation_code = None

        # Current coordinates
        current_x = None
        current_y = None
        previous_x = None
        previous_y = None

        current_d = None

        # Absolute or Relative/Incremental coordinates
        # Not implemented
        absolute = True

        # How to interpret circular interpolation: SINGLE or MULTI
        quadrant_mode = None

        # Indicates we are parsing an aperture macro
        current_macro = None

        # Indicates the current polarity: D-Dark, C-Clear
        current_polarity = 'D'

        # If a region is being defined
        making_region = False

        # ### Parsing starts here ## ##
        line_num = 0
        gline = ""

        s_tol = float(self.app.defaults["gerber_simp_tolerance"])

        self.app.inform.emit('%s %d %s.' % (_("Gerber processing. Parsing"), len(glines), _("lines")))
        try:
            for gline in glines:
                if self.app.abort_flag:
                    # graceful abort requested by the user
                    raise FlatCAMApp.GracefulException

                line_num += 1
                self.source_file += gline + '\n'

                # Cleanup #
                gline = gline.strip(' \r\n')
                # log.debug("Line=%3s %s" % (line_num, gline))

                # ###################
                # Ignored lines #####
                # Comments      #####
                # ###################
                match = self.comm_re.search(gline)
                if match:
                    continue

                # Polarity change ###### ##
                # Example: %LPD*% or %LPC*%
                # If polarity changes, creates geometry from current
                # buffer, then adds or subtracts accordingly.
                match = self.lpol_re.search(gline)
                if match:
                    new_polarity = match.group(1)
                    # log.info("Polarity CHANGE, LPC = %s, poly_buff = %s" % (self.is_lpc, poly_buffer))
                    self.is_lpc = True if new_polarity == 'C' else False
                    if len(path) > 1 and current_polarity != new_polarity:

                        # finish the current path and add it to the storage
                        # --- Buffered ----
                        width = self.apertures[last_path_aperture]["size"]

                        geo_dict = dict()
                        geo_f = LineString(path)
                        if not geo_f.is_empty:
                            follow_buffer.append(geo_f)
                            geo_dict['follow'] = geo_f

                        geo_s = LineString(path).buffer(width / 1.999, int(self.steps_per_circle / 4))
                        if not geo_s.is_empty:
                            if self.app.defaults['gerber_simplification']:
                                poly_buffer.append(geo_s.simplify(s_tol))
                            else:
                                poly_buffer.append(geo_s)
                            if self.is_lpc is True:
                                geo_dict['clear'] = geo_s
                            else:
                                geo_dict['solid'] = geo_s

                        if last_path_aperture not in self.apertures:
                            self.apertures[last_path_aperture] = dict()
                        if 'geometry' not in self.apertures[last_path_aperture]:
                            self.apertures[last_path_aperture]['geometry'] = []
                        self.apertures[last_path_aperture]['geometry'].append(deepcopy(geo_dict))

                        path = [path[-1]]

                    # --- Apply buffer ---
                    # If added for testing of bug #83
                    # TODO: Remove when bug fixed
                    if len(poly_buffer) > 0:
                        if current_polarity == 'D':
                            # self.follow_geometry = self.follow_geometry.union(cascaded_union(follow_buffer))
                            self.solid_geometry = self.solid_geometry.union(cascaded_union(poly_buffer))

                        else:
                            # self.follow_geometry = self.follow_geometry.difference(cascaded_union(follow_buffer))
                            self.solid_geometry = self.solid_geometry.difference(cascaded_union(poly_buffer))

                        # follow_buffer = []
                        poly_buffer = []

                    current_polarity = new_polarity
                    continue

                # ############################################################# ##
                # Number format ############################################### ##
                # Example: %FSLAX24Y24*%
                # ############################################################# ##
                # TODO: This is ignoring most of the format. Implement the rest.
                match = self.fmt_re.search(gline)
                if match:
                    absolute = {'A': 'Absolute', 'I': 'Relative'}[match.group(2)]
                    if match.group(1) is not None:
                        self.gerber_zeros = match.group(1)
                    self.int_digits = int(match.group(3))
                    self.frac_digits = int(match.group(4))
                    log.debug("Gerber format found. (%s) " % str(gline))

                    log.debug(
                        "Gerber format found. Gerber zeros = %s (L-omit leading zeros, T-omit trailing zeros, "
                        "D-no zero supression)" % self.gerber_zeros)
                    log.debug("Gerber format found. Coordinates type = %s (Absolute or Relative)" % absolute)
                    continue

                # ## Mode (IN/MM)
                # Example: %MOIN*%
                match = self.mode_re.search(gline)
                if match:
                    self.gerber_units = match.group(1)
                    log.debug("Gerber units found = %s" % self.gerber_units)
                    # Changed for issue #80
                    self.convert_units(match.group(1))
                    continue

                # ############################################################# ##
                # Combined Number format and Mode --- Allegro does this ####### ##
                # ############################################################# ##
                match = self.fmt_re_alt.search(gline)
                if match:
                    absolute = {'A': 'Absolute', 'I': 'Relative'}[match.group(2)]
                    if match.group(1) is not None:
                        self.gerber_zeros = match.group(1)
                    self.int_digits = int(match.group(3))
                    self.frac_digits = int(match.group(4))
                    log.debug("Gerber format found. (%s) " % str(gline))
                    log.debug(
                        "Gerber format found. Gerber zeros = %s (L-omit leading zeros, T-omit trailing zeros, "
                        "D-no zero suppression)" % self.gerber_zeros)
                    log.debug("Gerber format found. Coordinates type = %s (Absolute or Relative)" % absolute)

                    self.gerber_units = match.group(5)
                    log.debug("Gerber units found = %s" % self.gerber_units)
                    # Changed for issue #80
                    self.convert_units(match.group(5))
                    continue

                # ############################################################# ##
                # Search for OrCAD way for having Number format
                # ############################################################# ##
                match = self.fmt_re_orcad.search(gline)
                if match:
                    if match.group(1) is not None:
                        if match.group(1) == 'G74':
                            quadrant_mode = 'SINGLE'
                        elif match.group(1) == 'G75':
                            quadrant_mode = 'MULTI'
                        absolute = {'A': 'Absolute', 'I': 'Relative'}[match.group(3)]
                        if match.group(2) is not None:
                            self.gerber_zeros = match.group(2)

                        self.int_digits = int(match.group(4))
                        self.frac_digits = int(match.group(5))
                        log.debug("Gerber format found. (%s) " % str(gline))
                        log.debug(
                            "Gerber format found. Gerber zeros = %s (L-omit leading zeros, T-omit trailing zeros, "
                            "D-no zerosuppressionn)" % self.gerber_zeros)
                        log.debug("Gerber format found. Coordinates type = %s (Absolute or Relative)" % absolute)

                        self.gerber_units = match.group(1)
                        log.debug("Gerber units found = %s" % self.gerber_units)
                        # Changed for issue #80
                        self.convert_units(match.group(5))
                        continue

                # ############################################################# ##
                # Units (G70/1) OBSOLETE
                # ############################################################# ##
                match = self.units_re.search(gline)
                if match:
                    obs_gerber_units = {'0': 'IN', '1': 'MM'}[match.group(1)]
                    log.warning("Gerber obsolete units found = %s" % obs_gerber_units)
                    # Changed for issue #80
                    self.convert_units({'0': 'IN', '1': 'MM'}[match.group(1)])
                    continue

                # ############################################################# ##
                # Absolute/relative coordinates G90/1 OBSOLETE ######## ##
                # ##################################################### ##
                match = self.absrel_re.search(gline)
                if match:
                    absolute = {'0': "Absolute", '1': "Relative"}[match.group(1)]
                    log.warning("Gerber obsolete coordinates type found = %s (Absolute or Relative) " % absolute)
                    continue

                # ############################################################# ##
                # Aperture Macros ##################################### ##
                # Having this at the beginning will slow things down
                # but macros can have complicated statements than could
                # be caught by other patterns.
                # ############################################################# ##
                if current_macro is None:  # No macro started yet
                    match = self.am1_re.search(gline)
                    # Start macro if match, else not an AM, carry on.
                    if match:
                        log.debug("Starting macro. Line %d: %s" % (line_num, gline))
                        current_macro = match.group(1)
                        self.aperture_macros[current_macro] = ApertureMacro(name=current_macro)
                        if match.group(2):  # Append
                            self.aperture_macros[current_macro].append(match.group(2))
                        if match.group(3):  # Finish macro
                            # self.aperture_macros[current_macro].parse_content()
                            current_macro = None
                            log.debug("Macro complete in 1 line.")
                        continue
                else:  # Continue macro
                    log.debug("Continuing macro. Line %d." % line_num)
                    match = self.am2_re.search(gline)
                    if match:  # Finish macro
                        log.debug("End of macro. Line %d." % line_num)
                        self.aperture_macros[current_macro].append(match.group(1))
                        # self.aperture_macros[current_macro].parse_content()
                        current_macro = None
                    else:  # Append
                        self.aperture_macros[current_macro].append(gline)
                    continue

                # ## Aperture definitions %ADD...
                match = self.ad_re.search(gline)
                if match:
                    # log.info("Found aperture definition. Line %d: %s" % (line_num, gline))
                    self.aperture_parse(match.group(1), match.group(2), match.group(3))
                    continue

                # ############################################################# ##
                # Operation code alone ###################### ##
                # Operation code alone, usually just D03 (Flash)
                # self.opcode_re = re.compile(r'^D0?([123])\*$')
                # ############################################################# ##
                match = self.opcode_re.search(gline)
                if match:
                    current_operation_code = int(match.group(1))
                    current_d = current_operation_code

                    if current_operation_code == 3:

                        # --- Buffered ---
                        try:
                            log.debug("Bare op-code %d." % current_operation_code)
                            geo_dict = dict()
                            flash = self.create_flash_geometry(
                                Point(current_x, current_y), self.apertures[current_aperture],
                                self.steps_per_circle)

                            geo_dict['follow'] = Point([current_x, current_y])

                            if not flash.is_empty:
                                if self.app.defaults['gerber_simplification']:
                                    poly_buffer.append(flash.simplify(s_tol))
                                else:
                                    poly_buffer.append(flash)
                                if self.is_lpc is True:
                                    geo_dict['clear'] = flash
                                else:
                                    geo_dict['solid'] = flash

                                if current_aperture not in self.apertures:
                                    self.apertures[current_aperture] = dict()
                                if 'geometry' not in self.apertures[current_aperture]:
                                    self.apertures[current_aperture]['geometry'] = []
                                self.apertures[current_aperture]['geometry'].append(deepcopy(geo_dict))

                        except IndexError:
                            log.warning("Line %d: %s -> Nothing there to flash!" % (line_num, gline))

                    continue

                # ############################################################# ##
                # Tool/aperture change
                # Example: D12*
                # ############################################################# ##
                match = self.tool_re.search(gline)
                if match:
                    current_aperture = match.group(1)
                    # log.debug("Line %d: Aperture change to (%s)" % (line_num, current_aperture))

                    # If the aperture value is zero then make it something quite small but with a non-zero value
                    # so it can be processed by FlatCAM.
                    # But first test to see if the aperture type is "aperture macro". In that case
                    # we should not test for "size" key as it does not exist in this case.
                    if self.apertures[current_aperture]["type"] is not "AM":
                        if self.apertures[current_aperture]["size"] == 0:
                            self.apertures[current_aperture]["size"] = 1e-12
                    # log.debug(self.apertures[current_aperture])

                    # Take care of the current path with the previous tool
                    if len(path) > 1:
                        if self.apertures[last_path_aperture]["type"] == 'R':
                            # do nothing because 'R' type moving aperture is none at once
                            pass
                        else:
                            geo_dict = dict()
                            geo_f = LineString(path)
                            if not geo_f.is_empty:
                                follow_buffer.append(geo_f)
                                geo_dict['follow'] = geo_f

                            # --- Buffered ----
                            width = self.apertures[last_path_aperture]["size"]
                            geo_s = LineString(path).buffer(width / 1.999, int(self.steps_per_circle / 4))
                            if not geo_s.is_empty:
                                if self.app.defaults['gerber_simplification']:
                                    poly_buffer.append(geo_s.simplify(s_tol))
                                else:
                                    poly_buffer.append(geo_s)
                                if self.is_lpc is True:
                                    geo_dict['clear'] = geo_s
                                else:
                                    geo_dict['solid'] = geo_s

                            if last_path_aperture not in self.apertures:
                                self.apertures[last_path_aperture] = dict()
                            if 'geometry' not in self.apertures[last_path_aperture]:
                                self.apertures[last_path_aperture]['geometry'] = []
                            self.apertures[last_path_aperture]['geometry'].append(deepcopy(geo_dict))

                            path = [path[-1]]

                    continue

                # ############################################################# ##
                # G36* - Begin region
                # ############################################################# ##
                if self.regionon_re.search(gline):
                    if len(path) > 1:
                        # Take care of what is left in the path

                        geo_dict = dict()
                        geo_f = LineString(path)
                        if not geo_f.is_empty:
                            follow_buffer.append(geo_f)
                            geo_dict['follow'] = geo_f

                        # --- Buffered ----
                        width = self.apertures[last_path_aperture]["size"]
                        geo_s = LineString(path).buffer(width / 1.999, int(self.steps_per_circle / 4))
                        if not geo_s.is_empty:
                            if self.app.defaults['gerber_simplification']:
                                poly_buffer.append(geo_s.simplify(s_tol))
                            else:
                                poly_buffer.append(geo_s)
                            if self.is_lpc is True:
                                geo_dict['clear'] = geo_s
                            else:
                                geo_dict['solid'] = geo_s

                        if last_path_aperture not in self.apertures:
                            self.apertures[last_path_aperture] = dict()
                        if 'geometry' not in self.apertures[last_path_aperture]:
                            self.apertures[last_path_aperture]['geometry'] = []
                        self.apertures[last_path_aperture]['geometry'].append(deepcopy(geo_dict))

                        path = [path[-1]]

                    making_region = True
                    continue

                # ############################################################# ##
                # G37* - End region
                # ############################################################# ##
                if self.regionoff_re.search(gline):
                    making_region = False

                    if '0' not in self.apertures:
                        self.apertures['0'] = {}
                        self.apertures['0']['type'] = 'REG'
                        self.apertures['0']['size'] = 0.0
                        self.apertures['0']['geometry'] = []

                    # if D02 happened before G37 we now have a path with 1 element only; we have to add the current
                    # geo to the poly_buffer otherwise we loose it
                    if current_operation_code == 2:
                        if len(path) == 1:
                            # this means that the geometry was prepared previously and we just need to add it
                            geo_dict = dict()
                            if geo_f:
                                if not geo_f.is_empty:
                                    follow_buffer.append(geo_f)
                                    geo_dict['follow'] = geo_f
                            if geo_s:
                                if not geo_s.is_empty:
                                    if self.app.defaults['gerber_simplification']:
                                        poly_buffer.append(geo_s.simplify(s_tol))
                                    else:
                                        poly_buffer.append(geo_s)
                                    if self.is_lpc is True:
                                        geo_dict['clear'] = geo_s
                                    else:
                                        geo_dict['solid'] = geo_s

                            if geo_s or geo_f:
                                self.apertures['0']['geometry'].append(deepcopy(geo_dict))

                            path = [[current_x, current_y]]  # Start new path

                    # Only one path defines region?
                    # This can happen if D02 happened before G37 and
                    # is not and error.
                    if len(path) < 3:
                        # print "ERROR: Path contains less than 3 points:"
                        # path = [[current_x, current_y]]
                        continue

                    # For regions we may ignore an aperture that is None

                    # --- Buffered ---
                    geo_dict = dict()
                    region_f = Polygon(path).exterior
                    if not region_f.is_empty:
                        follow_buffer.append(region_f)
                        geo_dict['follow'] = region_f

                    region_s = Polygon(path)
                    if not region_s.is_valid:
                        region_s = region_s.buffer(0, int(self.steps_per_circle / 4))

                    if not region_s.is_empty:
                        if self.app.defaults['gerber_simplification']:
                            poly_buffer.append(region_s.simplify(s_tol))
                        else:
                            poly_buffer.append(region_s)
                        if self.is_lpc is True:
                            geo_dict['clear'] = region_s
                        else:
                            geo_dict['solid'] = region_s

                    if not region_s.is_empty or not region_f.is_empty:
                        self.apertures['0']['geometry'].append(deepcopy(geo_dict))

                    path = [[current_x, current_y]]  # Start new path
                    continue

                # ## G01/2/3* - Interpolation mode change
                # Can occur along with coordinates and operation code but
                # sometimes by itself (handled here).
                # Example: G01*
                match = self.interp_re.search(gline)
                if match:
                    current_interpolation_mode = int(match.group(1))
                    continue

                # ## G01 - Linear interpolation plus flashes
                # Operation code (D0x) missing is deprecated... oh well I will support it.
                # REGEX: r'^(?:G0?(1))?(?:X(-?\d+))?(?:Y(-?\d+))?(?:D0([123]))?\*$'
                match = self.lin_re.search(gline)
                if match:
                    # Dxx alone?
                    # if match.group(1) is None and match.group(2) is None and match.group(3) is None:
                    #     try:
                    #         current_operation_code = int(match.group(4))
                    #     except:
                    #         pass  # A line with just * will match too.
                    #     continue
                    # NOTE: Letting it continue allows it to react to the
                    #       operation code.

                    # Parse coordinates
                    if match.group(2) is not None:
                        linear_x = parse_gerber_number(match.group(2),
                                                       self.int_digits, self.frac_digits, self.gerber_zeros)
                        current_x = linear_x
                    else:
                        linear_x = current_x
                    if match.group(3) is not None:
                        linear_y = parse_gerber_number(match.group(3),
                                                       self.int_digits, self.frac_digits, self.gerber_zeros)
                        current_y = linear_y
                    else:
                        linear_y = current_y

                    # Parse operation code
                    if match.group(4) is not None:
                        current_operation_code = int(match.group(4))

                    # Pen down: add segment
                    if current_operation_code == 1:
                        # if linear_x or linear_y are None, ignore those
                        if current_x is not None and current_y is not None:
                            # only add the point if it's a new one otherwise skip it (harder to process)
                            if path[-1] != [current_x, current_y]:
                                path.append([current_x, current_y])

                            if making_region is False:
                                # if the aperture is rectangle then add a rectangular shape having as parameters the
                                # coordinates of the start and end point and also the width and height
                                # of the 'R' aperture
                                try:
                                    if self.apertures[current_aperture]["type"] == 'R':
                                        width = self.apertures[current_aperture]['width']
                                        height = self.apertures[current_aperture]['height']
                                        minx = min(path[0][0], path[1][0]) - width / 2
                                        maxx = max(path[0][0], path[1][0]) + width / 2
                                        miny = min(path[0][1], path[1][1]) - height / 2
                                        maxy = max(path[0][1], path[1][1]) + height / 2
                                        log.debug("Coords: %s - %s - %s - %s" % (minx, miny, maxx, maxy))

                                        geo_dict = dict()
                                        geo_f = Point([current_x, current_y])
                                        follow_buffer.append(geo_f)
                                        geo_dict['follow'] = geo_f

                                        geo_s = shply_box(minx, miny, maxx, maxy)
                                        if self.app.defaults['gerber_simplification']:
                                            poly_buffer.append(geo_s.simplify(s_tol))
                                        else:
                                            poly_buffer.append(geo_s)

                                        if self.is_lpc is True:
                                            geo_dict['clear'] = geo_s
                                        else:
                                            geo_dict['solid'] = geo_s

                                        if current_aperture not in self.apertures:
                                            self.apertures[current_aperture] = dict()
                                        if 'geometry' not in self.apertures[current_aperture]:
                                            self.apertures[current_aperture]['geometry'] = []
                                        self.apertures[current_aperture]['geometry'].append(deepcopy(geo_dict))
                                except Exception as e:
                                    pass
                            last_path_aperture = current_aperture
                            # we do this for the case that a region is done without having defined any aperture
                            if last_path_aperture is None:
                                if '0' not in self.apertures:
                                    self.apertures['0'] = {}
                                    self.apertures['0']['type'] = 'REG'
                                    self.apertures['0']['size'] = 0.0
                                    self.apertures['0']['geometry'] = []
                                last_path_aperture = '0'
                        else:
                            self.app.inform.emit('[WARNING] %s: %s' %
                                                 (_("Coordinates missing, line ignored"), str(gline)))
                            self.app.inform.emit('[WARNING_NOTCL] %s' %
                                                 _("GERBER file might be CORRUPT. Check the file !!!"))

                    elif current_operation_code == 2:
                        if len(path) > 1:
                            geo_s = None

                            geo_dict = dict()
                            # --- BUFFERED ---
                            # this treats the case when we are storing geometry as paths only
                            if making_region:
                                # we do this for the case that a region is done without having defined any aperture
                                if last_path_aperture is None:
                                    if '0' not in self.apertures:
                                        self.apertures['0'] = {}
                                        self.apertures['0']['type'] = 'REG'
                                        self.apertures['0']['size'] = 0.0
                                        self.apertures['0']['geometry'] = []
                                    last_path_aperture = '0'
                                geo_f = Polygon()
                            else:
                                geo_f = LineString(path)

                            try:
                                if self.apertures[last_path_aperture]["type"] != 'R':
                                    if not geo_f.is_empty:
                                        follow_buffer.append(geo_f)
                                        geo_dict['follow'] = geo_f
                            except Exception as e:
                                log.debug("camlib.Gerber.parse_lines() --> %s" % str(e))
                                if not geo_f.is_empty:
                                    follow_buffer.append(geo_f)
                                    geo_dict['follow'] = geo_f

                            # this treats the case when we are storing geometry as solids
                            if making_region:
                                # we do this for the case that a region is done without having defined any aperture
                                if last_path_aperture is None:
                                    if '0' not in self.apertures:
                                        self.apertures['0'] = {}
                                        self.apertures['0']['type'] = 'REG'
                                        self.apertures['0']['size'] = 0.0
                                        self.apertures['0']['geometry'] = []
                                    last_path_aperture = '0'

                                try:
                                    geo_s = Polygon(path)
                                except ValueError:
                                    log.warning("Problem %s %s" % (gline, line_num))
                                    self.app.inform.emit('[ERROR] %s: %s' %
                                                         (_("Region does not have enough points. "
                                                            "File will be processed but there are parser errors. "
                                                            "Line number"), str(line_num)))
                            else:
                                if last_path_aperture is None:
                                    log.warning("No aperture defined for curent path. (%d)" % line_num)
                                width = self.apertures[last_path_aperture]["size"]  # TODO: WARNING this should fail!
                                geo_s = LineString(path).buffer(width / 1.999, int(self.steps_per_circle / 4))

                            try:
                                if self.apertures[last_path_aperture]["type"] != 'R':
                                    if not geo_s.is_empty:
                                        if self.app.defaults['gerber_simplification']:
                                            poly_buffer.append(geo_s.simplify(s_tol))
                                        else:
                                            poly_buffer.append(geo_s)

                                        if self.is_lpc is True:
                                            geo_dict['clear'] = geo_s
                                        else:
                                            geo_dict['solid'] = geo_s
                            except Exception as e:
                                log.debug("camlib.Gerber.parse_lines() --> %s" % str(e))
                                if self.app.defaults['gerber_simplification']:
                                    poly_buffer.append(geo_s.simplify(s_tol))
                                else:
                                    poly_buffer.append(geo_s)

                                if self.is_lpc is True:
                                    geo_dict['clear'] = geo_s
                                else:
                                    geo_dict['solid'] = geo_s

                            if last_path_aperture not in self.apertures:
                                self.apertures[last_path_aperture] = dict()
                            if 'geometry' not in self.apertures[last_path_aperture]:
                                self.apertures[last_path_aperture]['geometry'] = []
                            self.apertures[last_path_aperture]['geometry'].append(deepcopy(geo_dict))

                        # if linear_x or linear_y are None, ignore those
                        if linear_x is not None and linear_y is not None:
                            path = [[linear_x, linear_y]]  # Start new path
                        else:
                            self.app.inform.emit('[WARNING] %s: %s' %
                                                 (_("Coordinates missing, line ignored"), str(gline)))
                            self.app.inform.emit('[WARNING_NOTCL] %s' %
                                                 _("GERBER file might be CORRUPT. Check the file !!!"))

                    # Flash
                    # Not allowed in region mode.
                    elif current_operation_code == 3:

                        # Create path draw so far.
                        if len(path) > 1:
                            # --- Buffered ----
                            geo_dict = dict()

                            # this treats the case when we are storing geometry as paths
                            geo_f = LineString(path)
                            if not geo_f.is_empty:
                                try:
                                    if self.apertures[last_path_aperture]["type"] != 'R':
                                        follow_buffer.append(geo_f)
                                        geo_dict['follow'] = geo_f
                                except Exception as e:
                                    log.debug("camlib.Gerber.parse_lines() --> G01 match D03 --> %s" % str(e))
                                    follow_buffer.append(geo_f)
                                    geo_dict['follow'] = geo_f

                            # this treats the case when we are storing geometry as solids
                            width = self.apertures[last_path_aperture]["size"]
                            geo_s = LineString(path).buffer(width / 1.999, int(self.steps_per_circle / 4))
                            if not geo_s.is_empty:
                                try:
                                    if self.apertures[last_path_aperture]["type"] != 'R':
                                        if self.app.defaults['gerber_simplification']:
                                            poly_buffer.append(geo_s.simplify(s_tol))
                                        else:
                                            poly_buffer.append(geo_s)

                                        if self.is_lpc is True:
                                            geo_dict['clear'] = geo_s
                                        else:
                                            geo_dict['solid'] = geo_s
                                except:
                                    if self.app.defaults['gerber_simplification']:
                                        poly_buffer.append(geo_s.simplify(s_tol))
                                    else:
                                        poly_buffer.append(geo_s)

                                    if self.is_lpc is True:
                                        geo_dict['clear'] = geo_s
                                    else:
                                        geo_dict['solid'] = geo_s

                            if last_path_aperture not in self.apertures:
                                self.apertures[last_path_aperture] = dict()
                            if 'geometry' not in self.apertures[last_path_aperture]:
                                self.apertures[last_path_aperture]['geometry'] = []
                            self.apertures[last_path_aperture]['geometry'].append(deepcopy(geo_dict))

                        # Reset path starting point
                        path = [[linear_x, linear_y]]

                        # --- BUFFERED ---
                        # Draw the flash
                        # this treats the case when we are storing geometry as paths
                        geo_dict = dict()
                        geo_flash = Point([linear_x, linear_y])
                        follow_buffer.append(geo_flash)
                        geo_dict['follow'] = geo_flash

                        # this treats the case when we are storing geometry as solids
                        flash = self.create_flash_geometry(
                            Point([linear_x, linear_y]),
                            self.apertures[current_aperture],
                            self.steps_per_circle
                        )
                        if not flash.is_empty:
                            if self.app.defaults['gerber_simplification']:
                                poly_buffer.append(flash.simplify(s_tol))
                            else:
                                poly_buffer.append(flash)

                            if self.is_lpc is True:
                                geo_dict['clear'] = flash
                            else:
                                geo_dict['solid'] = flash

                        if current_aperture not in self.apertures:
                            self.apertures[current_aperture] = dict()
                        if 'geometry' not in self.apertures[current_aperture]:
                            self.apertures[current_aperture]['geometry'] = []
                        self.apertures[current_aperture]['geometry'].append(deepcopy(geo_dict))

                    # maybe those lines are not exactly needed but it is easier to read the program as those coordinates
                    # are used in case that circular interpolation is encountered within the Gerber file
                    current_x = linear_x
                    current_y = linear_y

                    # log.debug("Line_number=%3s X=%s Y=%s (%s)" % (line_num, linear_x, linear_y, gline))
                    continue

                # ## G74/75* - Single or multiple quadrant arcs
                match = self.quad_re.search(gline)
                if match:
                    if match.group(1) == '4':
                        quadrant_mode = 'SINGLE'
                    else:
                        quadrant_mode = 'MULTI'
                    continue

                # ## G02/3 - Circular interpolation
                # 2-clockwise, 3-counterclockwise
                # Ex. format: G03 X0 Y50 I-50 J0 where the X, Y coords are the coords of the End Point
                match = self.circ_re.search(gline)
                if match:
                    arcdir = [None, None, "cw", "ccw"]

                    mode, circular_x, circular_y, i, j, d = match.groups()

                    try:
                        circular_x = parse_gerber_number(circular_x,
                                                         self.int_digits, self.frac_digits, self.gerber_zeros)
                    except Exception as e:
                        circular_x = current_x

                    try:
                        circular_y = parse_gerber_number(circular_y,
                                                         self.int_digits, self.frac_digits, self.gerber_zeros)
                    except Exception as e:
                        circular_y = current_y

                    # According to Gerber specification i and j are not modal, which means that when i or j are missing,
                    # they are to be interpreted as being zero
                    try:
                        i = parse_gerber_number(i, self.int_digits, self.frac_digits, self.gerber_zeros)
                    except Exception as e:
                        i = 0

                    try:
                        j = parse_gerber_number(j, self.int_digits, self.frac_digits, self.gerber_zeros)
                    except Exception as e:
                        j = 0

                    if quadrant_mode is None:
                        log.error("Found arc without preceding quadrant specification G74 or G75. (%d)" % line_num)
                        log.error(gline)
                        continue

                    if mode is None and current_interpolation_mode not in [2, 3]:
                        log.error("Found arc without circular interpolation mode defined. (%d)" % line_num)
                        log.error(gline)
                        continue
                    elif mode is not None:
                        current_interpolation_mode = int(mode)

                    # Set operation code if provided
                    if d is not None:
                        current_operation_code = int(d)

                    # Nothing created! Pen Up.
                    if current_operation_code == 2:
                        log.warning("Arc with D2. (%d)" % line_num)
                        if len(path) > 1:
                            geo_dict = dict()

                            if last_path_aperture is None:
                                log.warning("No aperture defined for curent path. (%d)" % line_num)

                            # --- BUFFERED ---
                            width = self.apertures[last_path_aperture]["size"]

                            # this treats the case when we are storing geometry as paths
                            geo_f = LineString(path)
                            if not geo_f.is_empty:
                                follow_buffer.append(geo_f)
                                geo_dict['follow'] = geo_f

                            # this treats the case when we are storing geometry as solids
                            buffered = LineString(path).buffer(width / 1.999, int(self.steps_per_circle))
                            if not buffered.is_empty:
                                if self.app.defaults['gerber_simplification']:
                                    poly_buffer.append(buffered.simplify(s_tol))
                                else:
                                    poly_buffer.append(buffered)

                                if self.is_lpc is True:
                                    geo_dict['clear'] = buffered
                                else:
                                    geo_dict['solid'] = buffered

                            if last_path_aperture not in self.apertures:
                                self.apertures[last_path_aperture] = dict()
                            if 'geometry' not in self.apertures[last_path_aperture]:
                                self.apertures[last_path_aperture]['geometry'] = []
                            self.apertures[last_path_aperture]['geometry'].append(deepcopy(geo_dict))

                        current_x = circular_x
                        current_y = circular_y
                        path = [[current_x, current_y]]  # Start new path
                        continue

                    # Flash should not happen here
                    if current_operation_code == 3:
                        log.error("Trying to flash within arc. (%d)" % line_num)
                        continue

                    if quadrant_mode == 'MULTI':
                        center = [i + current_x, j + current_y]
                        radius = sqrt(i ** 2 + j ** 2)
                        start = arctan2(-j, -i)  # Start angle
                        # Numerical errors might prevent start == stop therefore
                        # we check ahead of time. This should result in a
                        # 360 degree arc.
                        if current_x == circular_x and current_y == circular_y:
                            stop = start
                        else:
                            stop = arctan2(-center[1] + circular_y, -center[0] + circular_x)  # Stop angle

                        this_arc = arc(center, radius, start, stop,
                                       arcdir[current_interpolation_mode],
                                       self.steps_per_circle)

                        # The last point in the computed arc can have
                        # numerical errors. The exact final point is the
                        # specified (x, y). Replace.
                        this_arc[-1] = (circular_x, circular_y)

                        # Last point in path is current point
                        # current_x = this_arc[-1][0]
                        # current_y = this_arc[-1][1]
                        current_x, current_y = circular_x, circular_y

                        # Append
                        path += this_arc
                        last_path_aperture = current_aperture

                        continue

                    if quadrant_mode == 'SINGLE':

                        center_candidates = [
                            [i + current_x, j + current_y],
                            [-i + current_x, j + current_y],
                            [i + current_x, -j + current_y],
                            [-i + current_x, -j + current_y]
                        ]

                        valid = False
                        log.debug("I: %f  J: %f" % (i, j))
                        for center in center_candidates:
                            radius = sqrt(i ** 2 + j ** 2)

                            # Make sure radius to start is the same as radius to end.
                            radius2 = sqrt((center[0] - circular_x) ** 2 + (center[1] - circular_y) ** 2)
                            if radius2 < radius * 0.95 or radius2 > radius * 1.05:
                                continue  # Not a valid center.

                            # Correct i and j and continue as with multi-quadrant.
                            i = center[0] - current_x
                            j = center[1] - current_y

                            start = arctan2(-j, -i)  # Start angle
                            stop = arctan2(-center[1] + circular_y, -center[0] + circular_x)  # Stop angle
                            angle = abs(arc_angle(start, stop, arcdir[current_interpolation_mode]))
                            log.debug("ARC START: %f, %f  CENTER: %f, %f  STOP: %f, %f" %
                                      (current_x, current_y, center[0], center[1], circular_x, circular_y))
                            log.debug("START Ang: %f, STOP Ang: %f, DIR: %s, ABS: %.12f <= %.12f: %s" %
                                      (start * 180 / pi, stop * 180 / pi, arcdir[current_interpolation_mode],
                                       angle * 180 / pi, pi / 2 * 180 / pi, angle <= (pi + 1e-6) / 2))

                            if angle <= (pi + 1e-6) / 2:
                                log.debug("########## ACCEPTING ARC ############")
                                this_arc = arc(center, radius, start, stop,
                                               arcdir[current_interpolation_mode],
                                               self.steps_per_circle)

                                # Replace with exact values
                                this_arc[-1] = (circular_x, circular_y)

                                # current_x = this_arc[-1][0]
                                # current_y = this_arc[-1][1]
                                current_x, current_y = circular_x, circular_y

                                path += this_arc
                                last_path_aperture = current_aperture
                                valid = True
                                break

                        if valid:
                            continue
                        else:
                            log.warning("Invalid arc in line %d." % line_num)

                # ## EOF
                match = self.eof_re.search(gline)
                if match:
                    continue

                # ## Line did not match any pattern. Warn user.
                log.warning("Line ignored (%d): %s" % (line_num, gline))

            if len(path) > 1:
                # In case that G01 (moving) aperture is rectangular, there is no need to still create
                # another geo since we already created a shapely box using the start and end coordinates found in
                # path variable. We do it only for other apertures than 'R' type
                if self.apertures[last_path_aperture]["type"] == 'R':
                    pass
                else:
                    # EOF, create shapely LineString if something still in path
                    # ## --- Buffered ---

                    geo_dict = dict()
                    # this treats the case when we are storing geometry as paths
                    geo_f = LineString(path)
                    if not geo_f.is_empty:
                        follow_buffer.append(geo_f)
                        geo_dict['follow'] = geo_f

                    # this treats the case when we are storing geometry as solids
                    width = self.apertures[last_path_aperture]["size"]
                    geo_s = LineString(path).buffer(width / 1.999, int(self.steps_per_circle / 4))
                    if not geo_s.is_empty:
                        if self.app.defaults['gerber_simplification']:
                            poly_buffer.append(geo_s.simplify(s_tol))
                        else:
                            poly_buffer.append(geo_s)

                        if self.is_lpc is True:
                            geo_dict['clear'] = geo_s
                        else:
                            geo_dict['solid'] = geo_s

                    if last_path_aperture not in self.apertures:
                        self.apertures[last_path_aperture] = dict()
                    if 'geometry' not in self.apertures[last_path_aperture]:
                        self.apertures[last_path_aperture]['geometry'] = []
                    self.apertures[last_path_aperture]['geometry'].append(deepcopy(geo_dict))

            # TODO: make sure to keep track of units changes because right now it seems to happen in a weird way
            # find out the conversion factor used to convert inside the self.apertures keys: size, width, height
            file_units = self.gerber_units if self.gerber_units else 'IN'
            app_units = self.app.defaults['units']

            conversion_factor = 25.4 if file_units == 'IN' else (1 / 25.4) if file_units != app_units else 1

            # --- Apply buffer ---
            # this treats the case when we are storing geometry as paths
            self.follow_geometry = follow_buffer

            # this treats the case when we are storing geometry as solids

            if len(poly_buffer) == 0:
                log.error("Object is not Gerber file or empty. Aborting Object creation.")
                return 'fail'

            log.warning("Joining %d polygons." % len(poly_buffer))
            self.app.inform.emit('%s: %d.' % (_("Gerber processing. Joining polygons"), len(poly_buffer)))

            if self.use_buffer_for_union:
                log.debug("Union by buffer...")

                new_poly = MultiPolygon(poly_buffer)
                if self.app.defaults["gerber_buffering"] == 'full':
                    new_poly = new_poly.buffer(0.00000001)
                    new_poly = new_poly.buffer(-0.00000001)
                log.warning("Union(buffer) done.")
            else:
                log.debug("Union by union()...")
                new_poly = cascaded_union(poly_buffer)
                new_poly = new_poly.buffer(0, int(self.steps_per_circle / 4))
                log.warning("Union done.")

            if current_polarity == 'D':
                self.app.inform.emit('%s' % _("Gerber processing. Applying Gerber polarity."))
                if new_poly.is_valid:
                    self.solid_geometry = self.solid_geometry.union(new_poly)
                else:
                    # I do this so whenever the parsed geometry of the file is not valid (intersections) it is still
                    # loaded. Instead of applying a union I add to a list of polygons.
                    final_poly = []
                    try:
                        for poly in new_poly:
                            final_poly.append(poly)
                    except TypeError:
                        final_poly.append(new_poly)

                    try:
                        for poly in self.solid_geometry:
                            final_poly.append(poly)
                    except TypeError:
                        final_poly.append(self.solid_geometry)

                    self.solid_geometry = final_poly

                # try:
                #     self.solid_geometry = self.solid_geometry.union(new_poly)
                # except Exception as e:
                #     # in case in the new_poly are some self intersections try to avoid making union with them
                #     for poly in new_poly:
                #         try:
                #             self.solid_geometry = self.solid_geometry.union(poly)
                #         except:
                #             pass
            else:
                self.solid_geometry = self.solid_geometry.difference(new_poly)
        except Exception as err:
            ex_type, ex, tb = sys.exc_info()
            traceback.print_tb(tb)
            # print traceback.format_exc()

            log.error("Gerber PARSING FAILED. Line %d: %s" % (line_num, gline))

            loc = '%s #%d %s: %s\n' % (_("Gerber Line"), line_num, _("Gerber Line Content"), gline) + repr(err)
            self.app.inform.emit('[ERROR] %s\n%s:' %
                                 (_("Gerber Parser ERROR"), loc))

    @staticmethod
    def create_flash_geometry(location, aperture, steps_per_circle=None):

        # log.debug('Flashing @%s, Aperture: %s' % (location, aperture))

        if type(location) == list:
            location = Point(location)

        if aperture['type'] == 'C':  # Circles
            return location.buffer(aperture['size'] / 2, int(steps_per_circle / 4))

        if aperture['type'] == 'R':  # Rectangles
            loc = location.coords[0]
            width = aperture['width']
            height = aperture['height']
            minx = loc[0] - width / 2
            maxx = loc[0] + width / 2
            miny = loc[1] - height / 2
            maxy = loc[1] + height / 2
            return shply_box(minx, miny, maxx, maxy)

        if aperture['type'] == 'O':  # Obround
            loc = location.coords[0]
            width = aperture['width']
            height = aperture['height']
            if width > height:
                p1 = Point(loc[0] + 0.5 * (width - height), loc[1])
                p2 = Point(loc[0] - 0.5 * (width - height), loc[1])
                c1 = p1.buffer(height * 0.5, int(steps_per_circle / 4))
                c2 = p2.buffer(height * 0.5, int(steps_per_circle / 4))
            else:
                p1 = Point(loc[0], loc[1] + 0.5 * (height - width))
                p2 = Point(loc[0], loc[1] - 0.5 * (height - width))
                c1 = p1.buffer(width * 0.5, int(steps_per_circle / 4))
                c2 = p2.buffer(width * 0.5, int(steps_per_circle / 4))
            return cascaded_union([c1, c2]).convex_hull

        if aperture['type'] == 'P':  # Regular polygon
            loc = location.coords[0]
            diam = aperture['diam']
            n_vertices = aperture['nVertices']
            points = []
            for i in range(0, n_vertices):
                x = loc[0] + 0.5 * diam * (cos(2 * pi * i / n_vertices))
                y = loc[1] + 0.5 * diam * (sin(2 * pi * i / n_vertices))
                points.append((x, y))
            ply = Polygon(points)
            if 'rotation' in aperture:
                ply = affinity.rotate(ply, aperture['rotation'])
            return ply

        if aperture['type'] == 'AM':  # Aperture Macro
            loc = location.coords[0]
            flash_geo = aperture['macro'].make_geometry(aperture['modifiers'])
            if flash_geo.is_empty:
                log.warning("Empty geometry for Aperture Macro: %s" % str(aperture['macro'].name))
            return affinity.translate(flash_geo, xoff=loc[0], yoff=loc[1])

        log.warning("Unknown aperture type: %s" % aperture['type'])
        return None

    def create_geometry(self):
        """
        Geometry from a Gerber file is made up entirely of polygons.
        Every stroke (linear or circular) has an aperture which gives
        it thickness. Additionally, aperture strokes have non-zero area,
        and regions naturally do as well.

        :rtype : None
        :return: None
        """
        pass
        # self.buffer_paths()
        #
        # self.fix_regions()
        #
        # self.do_flashes()
        #
        # self.solid_geometry = cascaded_union(self.buffered_paths +
        #                                      [poly['polygon'] for poly in self.regions] +
        #                                      self.flash_geometry)

    def get_bounding_box(self, margin=0.0, rounded=False):
        """
        Creates and returns a rectangular polygon bounding at a distance of
        margin from the object's ``solid_geometry``. If margin > 0, the polygon
        can optionally have rounded corners of radius equal to margin.

        :param margin: Distance to enlarge the rectangular bounding
         box in both positive and negative, x and y axes.
        :type margin: float
        :param rounded: Wether or not to have rounded corners.
        :type rounded: bool
        :return: The bounding box.
        :rtype: Shapely.Polygon
        """

        bbox = self.solid_geometry.envelope.buffer(margin)
        if not rounded:
            bbox = bbox.envelope
        return bbox

    def bounds(self):
        """
        Returns coordinates of rectangular bounds
        of Gerber geometry: (xmin, ymin, xmax, ymax).
        """
        # fixed issue of getting bounds only for one level lists of objects
        # now it can get bounds for nested lists of objects

        log.debug("camlib.Gerber.bounds()")

        if self.solid_geometry is None:
            log.debug("solid_geometry is None")
            return 0, 0, 0, 0

        def bounds_rec(obj):
            if type(obj) is list and type(obj) is not MultiPolygon:
                minx = Inf
                miny = Inf
                maxx = -Inf
                maxy = -Inf

                for k in obj:
                    if type(k) is dict:
                        for key in k:
                            minx_, miny_, maxx_, maxy_ = bounds_rec(k[key])
                            minx = min(minx, minx_)
                            miny = min(miny, miny_)
                            maxx = max(maxx, maxx_)
                            maxy = max(maxy, maxy_)
                    else:
                        if not k.is_empty:
                            try:
                                minx_, miny_, maxx_, maxy_ = bounds_rec(k)
                            except Exception as e:
                                log.debug("camlib.Gerber.bounds() --> %s" % str(e))
                                return

                            minx = min(minx, minx_)
                            miny = min(miny, miny_)
                            maxx = max(maxx, maxx_)
                            maxy = max(maxy, maxy_)
                return minx, miny, maxx, maxy
            else:
                # it's a Shapely object, return it's bounds
                return obj.bounds

        bounds_coords = bounds_rec(self.solid_geometry)
        return bounds_coords

    def scale(self, xfactor, yfactor=None, point=None):
        """
        Scales the objects' geometry on the XY plane by a given factor.
        These are:

        * ``buffered_paths``
        * ``flash_geometry``
        * ``solid_geometry``
        * ``regions``

        NOTE:
        Does not modify the data used to create these elements. If these
        are recreated, the scaling will be lost. This behavior was modified
        because of the complexity reached in this class.

        :param xfactor: Number by which to scale on X axis.
        :type xfactor: float
        :param yfactor: Number by which to scale on Y axis.
        :type yfactor: float
        :param point: reference point for scaling operation
        :rtype : None
        """
        log.debug("camlib.Gerber.scale()")

        try:
            xfactor = float(xfactor)
        except:
            self.app.inform.emit('[ERROR_NOTCL] %s' %
                                 _("Scale factor has to be a number: integer or float."))
            return

        if yfactor is None:
            yfactor = xfactor
        else:
            try:
                yfactor = float(yfactor)
            except:
                self.app.inform.emit('[ERROR_NOTCL] %s' %
                                     _("Scale factor has to be a number: integer or float."))
                return

        if point is None:
            px = 0
            py = 0
        else:
            px, py = point

        # variables to display the percentage of work done
        self.geo_len = 0
        try:
            for __ in self.solid_geometry:
                self.geo_len += 1
        except TypeError:
            self.geo_len = 1

        self.old_disp_number = 0
        self.el_count = 0

        def scale_geom(obj):
            if type(obj) is list:
                new_obj = []
                for g in obj:
                    new_obj.append(scale_geom(g))
                return new_obj
            else:
                try:
                    self.el_count += 1
                    disp_number = int(np.interp(self.el_count, [0, self.geo_len], [0, 99]))
                    if self.old_disp_number < disp_number <= 100:
                        self.app.proc_container.update_view_text(' %d%%' % disp_number)
                        self.old_disp_number = disp_number

                    return affinity.scale(obj, xfactor, yfactor, origin=(px, py))
                except AttributeError:
                    return obj

        self.solid_geometry = scale_geom(self.solid_geometry)
        self.follow_geometry = scale_geom(self.follow_geometry)

        # we need to scale the geometry stored in the Gerber apertures, too
        try:
            for apid in self.apertures:
                if 'geometry' in self.apertures[apid]:
                    for geo_el in self.apertures[apid]['geometry']:
                        if 'solid' in geo_el:
                            geo_el['solid'] = scale_geom(geo_el['solid'])
                        if 'follow' in geo_el:
                            geo_el['follow'] = scale_geom(geo_el['follow'])
                        if 'clear' in geo_el:
                            geo_el['clear'] = scale_geom(geo_el['clear'])

        except Exception as e:
            log.debug('camlib.Gerber.scale() Exception --> %s' % str(e))
            return 'fail'

        self.app.inform.emit('[success] %s' %
                             _("Gerber Scale done."))
        self.app.proc_container.new_text = ''

        # ## solid_geometry ???
        #  It's a cascaded union of objects.
        # self.solid_geometry = affinity.scale(self.solid_geometry, factor,
        #                                      factor, origin=(0, 0))

        # # Now buffered_paths, flash_geometry and solid_geometry
        # self.create_geometry()

    def offset(self, vect):
        """
        Offsets the objects' geometry on the XY plane by a given vector.
        These are:

        * ``buffered_paths``
        * ``flash_geometry``
        * ``solid_geometry``
        * ``regions``

        NOTE:
        Does not modify the data used to create these elements. If these
        are recreated, the scaling will be lost. This behavior was modified
        because of the complexity reached in this class.

        :param vect: (x, y) offset vector.
        :type vect: tuple
        :return: None
        """
        log.debug("camlib.Gerber.offset()")

        try:
            dx, dy = vect
        except TypeError:
            self.app.inform.emit('[ERROR_NOTCL] %s' %
                                 _("An (x,y) pair of values are needed. "
                                   "Probable you entered only one value in the Offset field."))
            return

        # variables to display the percentage of work done
        self.geo_len = 0
        try:
            for __ in self.solid_geometry:
                self.geo_len += 1
        except TypeError:
            self.geo_len = 1

        self.old_disp_number = 0
        self.el_count = 0

        def offset_geom(obj):
            if type(obj) is list:
                new_obj = []
                for g in obj:
                    new_obj.append(offset_geom(g))
                return new_obj
            else:
                try:
                    self.el_count += 1
                    disp_number = int(np.interp(self.el_count, [0, self.geo_len], [0, 99]))
                    if self.old_disp_number < disp_number <= 100:
                        self.app.proc_container.update_view_text(' %d%%' % disp_number)
                        self.old_disp_number = disp_number

                    return affinity.translate(obj, xoff=dx, yoff=dy)
                except AttributeError:
                    return obj

        # ## Solid geometry
        self.solid_geometry = offset_geom(self.solid_geometry)
        self.follow_geometry = offset_geom(self.follow_geometry)

        # we need to offset the geometry stored in the Gerber apertures, too
        try:
            for apid in self.apertures:
                if 'geometry' in self.apertures[apid]:
                    for geo_el in self.apertures[apid]['geometry']:
                        if 'solid' in geo_el:
                            geo_el['solid'] = offset_geom(geo_el['solid'])
                        if 'follow' in geo_el:
                            geo_el['follow'] = offset_geom(geo_el['follow'])
                        if 'clear' in geo_el:
                            geo_el['clear'] = offset_geom(geo_el['clear'])

        except Exception as e:
            log.debug('camlib.Gerber.offset() Exception --> %s' % str(e))
            return 'fail'

        self.app.inform.emit('[success] %s' %
                             _("Gerber Offset done."))
        self.app.proc_container.new_text = ''

    def mirror(self, axis, point):
        """
        Mirrors the object around a specified axis passing through
        the given point. What is affected:

        * ``buffered_paths``
        * ``flash_geometry``
        * ``solid_geometry``
        * ``regions``

        NOTE:
        Does not modify the data used to create these elements. If these
        are recreated, the scaling will be lost. This behavior was modified
        because of the complexity reached in this class.

        :param axis: "X" or "Y" indicates around which axis to mirror.
        :type axis: str
        :param point: [x, y] point belonging to the mirror axis.
        :type point: list
        :return: None
        """
        log.debug("camlib.Gerber.mirror()")

        px, py = point
        xscale, yscale = {"X": (1.0, -1.0), "Y": (-1.0, 1.0)}[axis]

        # variables to display the percentage of work done
        self.geo_len = 0
        try:
            for __ in self.solid_geometry:
                self.geo_len += 1
        except TypeError:
            self.geo_len = 1

        self.old_disp_number = 0
        self.el_count = 0

        def mirror_geom(obj):
            if type(obj) is list:
                new_obj = []
                for g in obj:
                    new_obj.append(mirror_geom(g))
                return new_obj
            else:
                try:
                    self.el_count += 1
                    disp_number = int(np.interp(self.el_count, [0, self.geo_len], [0, 99]))
                    if self.old_disp_number < disp_number <= 100:
                        self.app.proc_container.update_view_text(' %d%%' % disp_number)
                        self.old_disp_number = disp_number

                    return affinity.scale(obj, xscale, yscale, origin=(px, py))
                except AttributeError:
                    return obj

        self.solid_geometry = mirror_geom(self.solid_geometry)
        self.follow_geometry = mirror_geom(self.follow_geometry)

        # we need to mirror the geometry stored in the Gerber apertures, too
        try:
            for apid in self.apertures:
                if 'geometry' in self.apertures[apid]:
                    for geo_el in self.apertures[apid]['geometry']:
                        if 'solid' in geo_el:
                            geo_el['solid'] = mirror_geom(geo_el['solid'])
                        if 'follow' in geo_el:
                            geo_el['follow'] = mirror_geom(geo_el['follow'])
                        if 'clear' in geo_el:
                            geo_el['clear'] = mirror_geom(geo_el['clear'])
        except Exception as e:
            log.debug('camlib.Gerber.mirror() Exception --> %s' % str(e))
            return 'fail'

        self.app.inform.emit('[success] %s' %
                             _("Gerber Mirror done."))
        self.app.proc_container.new_text = ''

    def skew(self, angle_x, angle_y, point):
        """
        Shear/Skew the geometries of an object by angles along x and y dimensions.

        Parameters
        ----------
        angle_x, angle_y : float, float
            The shear angle(s) for the x and y axes respectively. These can be
            specified in either degrees (default) or radians by setting
            use_radians=True.

        See shapely manual for more information:
        http://toblerity.org/shapely/manual.html#affine-transformations
        :param angle_x: the angle on X axis for skewing
        :param angle_y: the angle on Y axis for skewing
        :param point: reference point for skewing operation
        :return None
        """
        log.debug("camlib.Gerber.skew()")

        px, py = point

        # variables to display the percentage of work done
        self.geo_len = 0
        try:
            for __ in self.solid_geometry:
                self.geo_len += 1
        except TypeError:
            self.geo_len = 1

        self.old_disp_number = 0
        self.el_count = 0

        def skew_geom(obj):
            if type(obj) is list:
                new_obj = []
                for g in obj:
                    new_obj.append(skew_geom(g))
                return new_obj
            else:
                try:
                    self.el_count += 1
                    disp_number = int(np.interp(self.el_count, [0, self.geo_len], [0, 100]))
                    if self.old_disp_number < disp_number <= 100:
                        self.app.proc_container.update_view_text(' %d%%' % disp_number)
                        self.old_disp_number = disp_number

                    return affinity.skew(obj, angle_x, angle_y, origin=(px, py))
                except AttributeError:
                    return obj

        self.solid_geometry = skew_geom(self.solid_geometry)
        self.follow_geometry = skew_geom(self.follow_geometry)

        # we need to skew the geometry stored in the Gerber apertures, too
        try:
            for apid in self.apertures:
                if 'geometry' in self.apertures[apid]:
                    for geo_el in self.apertures[apid]['geometry']:
                        if 'solid' in geo_el:
                            geo_el['solid'] = skew_geom(geo_el['solid'])
                        if 'follow' in geo_el:
                            geo_el['follow'] = skew_geom(geo_el['follow'])
                        if 'clear' in geo_el:
                            geo_el['clear'] = skew_geom(geo_el['clear'])
        except Exception as e:
            log.debug('camlib.Gerber.skew() Exception --> %s' % str(e))
            return 'fail'

        self.app.inform.emit('[success] %s' % _("Gerber Skew done."))
        self.app.proc_container.new_text = ''

    def rotate(self, angle, point):
        """
        Rotate an object by a given angle around given coords (point)
        :param angle:
        :param point:
        :return:
        """
        log.debug("camlib.Gerber.rotate()")

        px, py = point

        # variables to display the percentage of work done
        self.geo_len = 0
        try:
            for __ in self.solid_geometry:
                self.geo_len += 1
        except TypeError:
            self.geo_len = 1

        self.old_disp_number = 0
        self.el_count = 0

        def rotate_geom(obj):
            if type(obj) is list:
                new_obj = []
                for g in obj:
                    new_obj.append(rotate_geom(g))
                return new_obj
            else:
                try:
                    self.el_count += 1
                    disp_number = int(np.interp(self.el_count, [0, self.geo_len], [0, 100]))
                    if self.old_disp_number < disp_number <= 100:
                        self.app.proc_container.update_view_text(' %d%%' % disp_number)
                        self.old_disp_number = disp_number

                    return affinity.rotate(obj, angle, origin=(px, py))
                except AttributeError:
                    return obj

        self.solid_geometry = rotate_geom(self.solid_geometry)
        self.follow_geometry = rotate_geom(self.follow_geometry)

        # we need to rotate the geometry stored in the Gerber apertures, too
        try:
            for apid in self.apertures:
                if 'geometry' in self.apertures[apid]:
                    for geo_el in self.apertures[apid]['geometry']:
                        if 'solid' in geo_el:
                            geo_el['solid'] = rotate_geom(geo_el['solid'])
                        if 'follow' in geo_el:
                            geo_el['follow'] = rotate_geom(geo_el['follow'])
                        if 'clear' in geo_el:
                            geo_el['clear'] = rotate_geom(geo_el['clear'])
        except Exception as e:
            log.debug('camlib.Gerber.rotate() Exception --> %s' % str(e))
            return 'fail'
        self.app.inform.emit('[success] %s' %
                             _("Gerber Rotate done."))
        self.app.proc_container.new_text = ''