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- started work in HPGL2 parser

Marius Stanciu 6 년 전
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3개의 변경된 파일1254개의 추가작업 그리고 1개의 파일을 삭제
  1. 4 0
      README.md
  2. 1 1
      camlib.py
  3. 1249 0
      flatcamParsers/ParseHPGL2.py

+ 4 - 0
README.md

@@ -9,6 +9,10 @@ CAD program, and create G-Code for Isolation routing.
 
 
 =================================================
 =================================================
 
 
+11.12.2019
+
+- started work in HPGL2 parser
+
 10.12.2019
 10.12.2019
 
 
 - small changes in the Geometry UI
 - small changes in the Geometry UI

+ 1 - 1
camlib.py

@@ -459,7 +459,7 @@ class Geometry(object):
 
 
     defaults = {
     defaults = {
         "units": 'in',
         "units": 'in',
-        "geo_steps_per_circle": 128
+        "geo_steps_per_circle": 64
     }
     }
 
 
     def __init__(self, geo_steps_per_circle=None):
     def __init__(self, geo_steps_per_circle=None):

+ 1249 - 0
flatcamParsers/ParseHPGL2.py

@@ -0,0 +1,1249 @@
+# ############################################################
+# FlatCAM: 2D Post-processing for Manufacturing              #
+# http://flatcam.org                                         #
+# File Author: Marius Adrina Stanciu (c)                     #
+# Date: 12/11/2019                                           #
+# MIT Licence                                                #
+# ############################################################
+
+from camlib import Geometry, arc, arc_angle
+import FlatCAMApp
+
+import numpy as np
+import re
+import logging
+import traceback
+from copy import deepcopy
+import sys
+
+from shapely.ops import cascaded_union, unary_union
+from shapely.geometry import Polygon, MultiPolygon, LineString, Point
+import shapely.affinity as affinity
+from shapely.geometry import box as shply_box
+
+import FlatCAMTranslation as fcTranslate
+import gettext
+import builtins
+
+if '_' not in builtins.__dict__:
+    _ = gettext.gettext
+
+log = logging.getLogger('base')
+
+
+class HPGL2(Geometry):
+    """
+    HPGL2 parsing.
+    """
+
+    defaults = {
+        "steps_per_circle": 64,
+        "use_buffer_for_union": True
+    }
+
+    def __init__(self, steps_per_circle=None):
+        """
+        The constructor takes no parameters.
+
+        :return: Geometry object
+        :rtype: Geometry
+        """
+
+        # How to approximate a circle with lines.
+        self.steps_per_circle = steps_per_circle if steps_per_circle is not None else \
+            int(self.app.defaults["geometry_circle_steps"])
+
+        self.decimals = self.app.decimals
+
+        # Initialize parent
+        Geometry.__init__(self, geo_steps_per_circle=self.steps_per_circle)
+
+        # Number format
+        self.coord_mm_factor = 0.040
+
+        # store the file units here:
+        self.units = self.app.defaults['gerber_def_units']
+
+        # will store the geometry's as solids
+        self.solid_geometry = None
+
+        # will store the geometry's as paths
+        self.follow_geometry = []
+
+        self.source_file = ''
+
+        # Attributes to be included in serialization
+        # Always append to it because it carries contents
+        # from Geometry.
+        self.ser_attrs += ['solid_geometry', 'follow_geometry', 'source_file']
+
+        # ### Parser patterns ## ##
+
+        # comment
+        self.comment_re = re.compile(r"^CO\s*[\"']([a-zA-Z0-9\s]*)[\"'];?$")
+        # absolute move to x, y
+        self.abs_move_re = re.compile(r"^PA\s*(-?\d+\.\d+?),?\s*(-?\d+\.\d+?)*;?$")
+        # relative move to x, y
+        self.rel_move_re = re.compile(r"^PR\s*(-?\d+\.\d+?),?\s*(-?\d+\.\d+?)*;?$")
+        # pen position
+        self.pen_re = re.compile(r"^(P[U|D]);?$")
+        # Initialize
+        self.mode_re = re.compile(r'^(IN);?$')
+        # select pen
+        self.sp_re = re.compile(r'SP(\d);?$')
+
+
+        self.fmt_re_alt = re.compile(r'%FS([LTD])?([AI])X(\d)(\d)Y\d\d\*MO(IN|MM)\*%$')
+        self.fmt_re_orcad = re.compile(r'(G\d+)*\**%FS([LTD])?([AI]).*X(\d)(\d)Y\d\d\*%$')
+
+        # 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]))?\*$')
+
+        # G02/3... - Circular interpolation with coordinates
+        # 2-clockwise, 3-counterclockwise
+        # Operation code (D0x) missing is deprecated... oh well I will support it.
+        # Optional start with G02 or G03, optional end with D01 or D02 with
+        # optional coordinates but at least one in any order.
+        self.circ_re = re.compile(r'^(?:G0?([23]))?(?=.*X([+-]?\d+))?(?=.*Y([+-]?\d+))' +
+                                  '?(?=.*I([+-]?\d+))?(?=.*J([+-]?\d+))?[XYIJ][^D]*(?:D0([12]))?\*$')
+
+        # 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]).*\*$')
+
+        # Absolute/Relative G90/1 (OBSOLETE)
+        self.absrel_re = re.compile(r'^G9([01])\*$')
+
+        # flag to store if a conversion was done. It is needed because multiple units declarations can be found
+        # in a Gerber file (normal or obsolete ones)
+        self.conversion_done = False
+
+        self.use_buffer_for_union = self.app.defaults["gerber_use_buffer_for_union"]
+
+    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:
+            self.parse_lines([line.rstrip('\n') for line in gfile])
+
+    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
+
+                # ## Mode (IN/MM)
+                # Example: %MOIN*%
+                match = self.mode_re.search(gline)
+                if match:
+                    self.units = match.group(1)
+                    log.debug("Gerber units found = %s" % self.units)
+                    # Changed for issue #80
+                    # self.convert_units(match.group(1))
+                    self.conversion_done = True
+                    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
+
+                # ## 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:
+                    # Parse coordinates
+                    if match.group(2) is not None:
+                        linear_x = parse_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_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 !!!"))
+
+                    # 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
+
+                # ## 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_number(circular_x,
+                                                         self.int_digits, self.frac_digits, self.gerber_zeros)
+                    except Exception as e:
+                        circular_x = current_x
+
+                    try:
+                        circular_y = parse_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_number(i, self.int_digits, self.frac_digits, self.gerber_zeros)
+                    except Exception as e:
+                        i = 0
+
+                    try:
+                        j = parse_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 = np.sqrt(i ** 2 + j ** 2)
+                        start = np.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 = np.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 = np.sqrt(i ** 2 + j ** 2)
+
+                            # Make sure radius to start is the same as radius to end.
+                            radius2 = np.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 = np.arctan2(-j, -i)  # Start angle
+                            stop = np.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 / np.pi, stop * 180 / np.pi, arcdir[current_interpolation_mode],
+                                       angle * 180 / np.pi, np.pi / 2 * 180 / np.pi, angle <= (np.pi + 1e-6) / 2))
+
+                            if angle <= (np.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)
+
+
+                # ## Line did not match any pattern. Warn user.
+                log.warning("Line ignored (%d): %s" % (line_num, gline))
+
+            # --- 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 and len(self.solid_geometry) == 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
+
+            else:
+                self.solid_geometry = self.solid_geometry.difference(new_poly)
+
+            # init this for the following operations
+            self.conversion_done = False
+        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))
+
+    def create_geometry(self):
+        """
+        :rtype : None
+        :return: None
+        """
+        pass
+
+    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("parseGerber.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 = np.Inf
+                miny = np.Inf
+                maxx = -np.Inf
+                maxy = -np.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 convert_units(self, obj_units):
+        """
+        Converts the units of the object to ``units`` by scaling all
+        the geometry appropriately. This call ``scale()``. Don't call
+        it again in descendants.
+
+        :param obj_units: "IN" or "MM"
+        :type obj_units: str
+        :return: Scaling factor resulting from unit change.
+        :rtype: float
+        """
+
+        if obj_units.upper() == self.units.upper():
+            log.debug("parseGerber.Gerber.convert_units() --> Factor: 1")
+            return 1.0
+
+        if obj_units.upper() == "MM":
+            factor = 25.4
+            log.debug("parseGerber.Gerber.convert_units() --> Factor: 25.4")
+        elif obj_units.upper() == "IN":
+            factor = 1 / 25.4
+            log.debug("parseGerber.Gerber.convert_units() --> Factor: %s" % str(1 / 25.4))
+        else:
+            log.error("Unsupported units: %s" % str(obj_units))
+            log.debug("parseGerber.Gerber.convert_units() --> Factor: 1")
+            return 1.0
+
+        self.units = obj_units
+        self.file_units_factor = factor
+        self.scale(factor, factor)
+        return factor
+
+    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("parseGerber.Gerber.scale()")
+
+        try:
+            xfactor = float(xfactor)
+        except Exception:
+            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 Exception:
+                self.app.inform.emit('[ERROR_NOTCL] %s' %
+                                     _("Scale factor has to be a number: integer or float."))
+                return
+
+        if xfactor == 0 and yfactor == 0:
+            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:
+            self.geo_len = len(self.solid_geometry)
+        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:
+                new_geometry = list()
+                if 'geometry' in self.apertures[apid]:
+                    for geo_el in self.apertures[apid]['geometry']:
+                        new_geo_el = dict()
+                        if 'solid' in geo_el:
+                            new_geo_el['solid'] = scale_geom(geo_el['solid'])
+                        if 'follow' in geo_el:
+                            new_geo_el['follow'] = scale_geom(geo_el['follow'])
+                        if 'clear' in geo_el:
+                            new_geo_el['clear'] = scale_geom(geo_el['clear'])
+                        new_geometry.append(new_geo_el)
+
+                self.apertures[apid]['geometry'] = deepcopy(new_geometry)
+
+                try:
+                    if str(self.apertures[apid]['type']) == 'R' or str(self.apertures[apid]['type']) == 'O':
+                        self.apertures[apid]['width'] *= xfactor
+                        self.apertures[apid]['height'] *= xfactor
+                    elif str(self.apertures[apid]['type']) == 'P':
+                        self.apertures[apid]['diam'] *= xfactor
+                        self.apertures[apid]['nVertices'] *= xfactor
+                except KeyError:
+                    pass
+
+                try:
+                    if self.apertures[apid]['size'] is not None:
+                        self.apertures[apid]['size'] = float(self.apertures[apid]['size'] * xfactor)
+                except KeyError:
+                    pass
+
+        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("parseGerber.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
+
+        if dx == 0 and dy == 0:
+            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("parseGerber.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("parseGerber.Gerber.skew()")
+
+        px, py = point
+
+        if angle_x == 0 and angle_y == 0:
+            return
+
+        # variables to display the percentage of work done
+        self.geo_len = 0
+        try:
+            self.geo_len = len(self.solid_geometry)
+        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("parseGerber.Gerber.rotate()")
+
+        px, py = point
+
+        if angle == 0:
+            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 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 = ''
+
+
+def parse_number(strnumber):
+    """
+    Parse a single number of HPGL2 coordinates.
+
+    :param strnumber: String containing a number
+    from a coordinate data block, possibly with a leading sign.
+    :type strnumber: str
+    :return: The number in floating point.
+    :rtype: float
+    """
+
+    return float(strnumber) * 40.0 # in milimeters
+