FlatCAM/FlatCAM.py

import threading
from gi.repository import Gtk, Gdk, GLib, GObject
import simplejson as json

from matplotlib.figure import Figure
from numpy import arange, sin, pi
from matplotlib.backends.backend_gtk3agg import FigureCanvasGTK3Agg as FigureCanvas
#from matplotlib.backends.backend_gtk3cairo import FigureCanvasGTK3Cairo as FigureCanvas
#from matplotlib.backends.backend_cairo import FigureCanvasCairo as FigureCanvas

from camlib import *
import sys


########################################
##            FlatCAMObj              ##
########################################
class FlatCAMObj:
    """
    Base type of objects handled in FlatCAM. These become interactive
    in the GUI, can be plotted, and their options can be modified
    by the user in their respective forms.
    """

    # Instance of the application to which these are related.
    # The app should set this value.
    app = None

    def __init__(self, name):
        self.options = {"name": name}
        self.form_kinds = {"name": "entry_text"}  # Kind of form element for each option
        self.radios = {}  # Name value pairs for radio sets
        self.radios_inv = {}  # Inverse of self.radios
        self.axes = None  # Matplotlib axes
        self.kind = None  # Override with proper name

    def setup_axes(self, figure):
        """
        1) Creates axes if they don't exist. 2) Clears axes. 3) Attaches
        them to figure if not part of the figure. 4) Sets transparent
        background. 5) Sets 1:1 scale aspect ratio.

        :param figure: A Matplotlib.Figure on which to add/configure axes.
        :type figure: matplotlib.figure.Figure
        :return: None
        :rtype: None
        """
        if self.axes is None:
            print "New axes"
            self.axes = figure.add_axes([0.05, 0.05, 0.9, 0.9],
                                        label=self.options["name"])
        elif self.axes not in figure.axes:
            print "Clearing and attaching axes"
            self.axes.cla()
            figure.add_axes(self.axes)
        else:
            print "Clearing Axes"
            self.axes.cla()

        # Remove all decoration. The app's axes will have
        # the ticks and grid.
        self.axes.set_frame_on(False)  # No frame
        self.axes.set_xticks([])  # No tick
        self.axes.set_yticks([])  # No ticks
        self.axes.patch.set_visible(False)  # No background
        self.axes.set_aspect(1)

    def to_form(self):
        """
        Copies options to the UI form.

        :return: None
        """
        for option in self.options:
            self.set_form_item(option)

    def read_form(self):
        """
        Reads form into ``self.options``.

        :return: None
        :rtype: None
        """
        for option in self.options:
            self.read_form_item(option)

    def build_ui(self):
        """
        Sets up the UI/form for this object.

        :return: None
        :rtype: None
        """

        # Where the UI for this object is drawn
        box_selected = self.app.builder.get_object("box_selected")

        # Remove anything else in the box
        box_children = box_selected.get_children()
        for child in box_children:
            box_selected.remove(child)

        osw = self.app.builder.get_object("offscrwindow_" + self.kind)  # offscreenwindow
        sw = self.app.builder.get_object("sw_" + self.kind)  # scrollwindows
        osw.remove(sw)  # TODO: Is this needed ?
        vp = self.app.builder.get_object("vp_" + self.kind)  # Viewport
        vp.override_background_color(Gtk.StateType.NORMAL, Gdk.RGBA(1, 1, 1, 1))

        # Put in the UI
        box_selected.pack_start(sw, True, True, 0)

        entry_name = self.app.builder.get_object("entry_text_" + self.kind + "_name")
        entry_name.connect("activate", self.app.on_activate_name)
        self.to_form()
        sw.show()

    def set_form_item(self, option):
        """
        Copies the specified options to the UI form.

        :param option: Name of the option (Key in ``self.options``).
        :type option: str
        :return: None
        """
        fkind = self.form_kinds[option]
        fname = fkind + "_" + self.kind + "_" + option

        if fkind == 'entry_eval' or fkind == 'entry_text':
            self.app.builder.get_object(fname).set_text(str(self.options[option]))
            return
        if fkind == 'cb':
            self.app.builder.get_object(fname).set_active(self.options[option])
            return
        if fkind == 'radio':
            self.app.builder.get_object(self.radios_inv[option][self.options[option]]).set_active(True)
            return
        print "Unknown kind of form item:", fkind

    def read_form_item(self, option):
        fkind = self.form_kinds[option]
        fname = fkind + "_" + self.kind + "_" + option

        if fkind == 'entry_text':
            self.options[option] = self.app.builder.get_object(fname).get_text()
            return
        if fkind == 'entry_eval':
            self.options[option] = self.app.get_eval(fname)
            return
        if fkind == 'cb':
            self.options[option] = self.app.builder.get_object(fname).get_active()
            return
        if fkind == 'radio':
            self.options[option] = self.app.get_radio_value(self.radios[option])
            return
        print "Unknown kind of form item:", fkind

    def plot(self, figure):
        """
        Extend this method! Sets up axes if needed and
        clears them. Descendants must do the actual plotting.
        """
        # Creates the axes if necessary and sets them up.
        self.setup_axes(figure)

        # Clear axes.
        # self.axes.cla()
        # return

    def serialize(self):
        """
        Returns a representation of the object as a dictionary so
        it can be later exported as JSON. Override this method.
        @return: Dictionary representing the object
        @rtype: dict
        """
        return

    def deserialize(self, obj_dict):
        """
        Re-builds an object from its serialized version.
        @param obj_dict: Dictionary representing a FlatCAMObj
        @type obj_dict: dict
        @return None
        """
        return


class FlatCAMGerber(FlatCAMObj, Gerber):
    """
    Represents Gerber code.
    """

    def __init__(self, name):
        Gerber.__init__(self)
        FlatCAMObj.__init__(self, name)

        self.kind = "gerber"

        # The 'name' is already in self.options from FlatCAMObj
        self.options.update({
            "plot": True,
            "mergepolys": True,
            "multicolored": False,
            "solid": False,
            "isotooldia": 0.4 / 25.4,
            "cutoutmargin": 0.2,
            "cutoutgapsize": 0.15,
            "gaps": "tb",
            "noncoppermargin": 0.0,
            "bboxmargin": 0.0,
            "bboxrounded": False
        })

        # The 'name' is already in self.form_kinds from FlatCAMObj
        self.form_kinds.update({
            "plot": "cb",
            "mergepolys": "cb",
            "multicolored": "cb",
            "solid": "cb",
            "isotooldia": "entry_eval",
            "cutoutmargin": "entry_eval",
            "cutoutgapsize": "entry_eval",
            "gaps": "radio",
            "noncoppermargin": "entry_eval",
            "bboxmargin": "entry_eval",
            "bboxrounded": "cb"
        })

        self.radios = {"gaps": {"rb_2tb": "tb", "rb_2lr": "lr", "rb_4": "4"}}
        self.radios_inv = {"gaps": {"tb": "rb_2tb", "lr": "rb_2lr", "4": "rb_4"}}

        # Attributes to be included in serialization
        # Always append to it because it carries contents
        # from predecessors.
        self.ser_attrs += ['options', 'kind']

    def convert_units(self, units):
        """
        Converts the units of the object by scaling dimensions in all geometry
        and options.

        :param units: Units to which to convert the object: "IN" or "MM".
        :type units: str
        :return: None
        :rtype: None
        """
        factor = Gerber.convert_units(self, units)

        self.options['isotooldia'] *= factor
        self.options['cutoutmargin'] *= factor
        self.options['cutoutgapsize'] *= factor
        self.options['noncoppermargin'] *= factor
        self.options['bboxmargin'] *= factor

    def plot(self, figure):
        FlatCAMObj.plot(self, figure)

        self.create_geometry()

        if self.options["mergepolys"]:
            geometry = self.solid_geometry
        else:
            geometry = self.buffered_paths + \
                       [poly['polygon'] for poly in self.regions] + \
                       self.flash_geometry

        if self.options["multicolored"]:
            linespec = '-'
        else:
            linespec = 'k-'

        for poly in geometry:
            x, y = poly.exterior.xy
            self.axes.plot(x, y, linespec)
            for ints in poly.interiors:
                x, y = ints.coords.xy
                self.axes.plot(x, y, linespec)

        self.app.canvas.queue_draw()

    def serialize(self):
        return {
            "options": self.options,
            "kind": self.kind
        }


class FlatCAMExcellon(FlatCAMObj, Excellon):
    """
    Represents Excellon code.
    """

    def __init__(self, name):
        Excellon.__init__(self)
        FlatCAMObj.__init__(self, name)

        self.kind = "excellon"

        self.options.update({
            "plot": True,
            "solid": False,
            "multicolored": False,
            "drillz": -0.1,
            "travelz": 0.1,
            "feedrate": 5.0,
            "toolselection": ""
        })

        self.form_kinds.update({
            "plot": "cb",
            "solid": "cb",
            "multicolored": "cb",
            "drillz": "entry_eval",
            "travelz": "entry_eval",
            "feedrate": "entry_eval",
            "toolselection": "entry_text"
        })

        # TODO: Document this.
        self.tool_cbs = {}

        # Attributes to be included in serialization
        # Always append to it because it carries contents
        # from predecessors.
        self.ser_attrs += ['options', 'kind']

    def convert_units(self, units):
        factor = Excellon.convert_units(self, units)

        self.options['drillz'] *= factor
        self.options['travelz'] *= factor
        self.options['feedrate'] *= factor

    def plot(self, figure):
        FlatCAMObj.plot(self, figure)
        #self.setup_axes(figure)
        self.create_geometry()

        # Plot excellon
        for geo in self.solid_geometry:
            x, y = geo.exterior.coords.xy
            self.axes.plot(x, y, 'r-')
            for ints in geo.interiors:
                x, y = ints.coords.xy
                self.axes.plot(x, y, 'g-')

        self.app.on_zoom_fit(None)
        self.app.canvas.queue_draw()

    def show_tool_chooser(self):
        win = Gtk.Window()
        box = Gtk.Box(spacing=2)
        box.set_orientation(Gtk.Orientation(1))
        win.add(box)
        for tool in self.tools:
            self.tool_cbs[tool] = Gtk.CheckButton(label=tool + ": " + str(self.tools[tool]))
            box.pack_start(self.tool_cbs[tool], False, False, 1)
        button = Gtk.Button(label="Accept")
        box.pack_start(button, False, False, 1)
        win.show_all()

        def on_accept(widget):
            win.destroy()
            tool_list = []
            for tool in self.tool_cbs:
                if self.tool_cbs[tool].get_active():
                    tool_list.append(tool)
            self.options["toolselection"] = ", ".join(tool_list)
            self.to_form()

        button.connect("activate", on_accept)
        button.connect("clicked", on_accept)


class FlatCAMCNCjob(FlatCAMObj, CNCjob):
    """
    Represents G-Code.
    """

    def __init__(self, name, units="in", kind="generic", z_move=0.1,
                 feedrate=3.0, z_cut=-0.002, tooldia=0.0):
        CNCjob.__init__(self, units=units, kind=kind, z_move=z_move,
                        feedrate=feedrate, z_cut=z_cut, tooldia=tooldia)
        FlatCAMObj.__init__(self, name)

        self.kind = "cncjob"

        self.options.update({
            "plot": True,
            "solid": False,
            "multicolored": False,
            "tooldia": 0.4 / 25.4  # 0.4mm in inches
        })

        self.form_kinds.update({
            "plot": "cb",
            "solid": "cb",
            "multicolored": "cb",
            "tooldia": "entry_eval"
        })

        # Attributes to be included in serialization
        # Always append to it because it carries contents
        # from predecessors.
        self.ser_attrs += ['options', 'kind']

    def plot(self, figure):
        FlatCAMObj.plot(self, figure)
        #self.setup_axes(figure)
        self.plot2(self.axes, tooldia=self.options["tooldia"])
        self.app.on_zoom_fit(None)
        self.app.canvas.queue_draw()

    def convert_units(self, units):
        factor = CNCjob.convert_units(self, units)
        print "FlatCAMCNCjob.convert_units()"
        self.options["tooldia"] *= factor

class FlatCAMGeometry(FlatCAMObj, Geometry):
    """
    Geometric object not associated with a specific
    format.
    """

    def __init__(self, name):
        FlatCAMObj.__init__(self, name)
        Geometry.__init__(self)

        self.kind = "geometry"

        self.options.update({
            "plot": True,
            "solid": False,
            "multicolored": False,
            "cutz": -0.002,
            "travelz": 0.1,
            "feedrate": 5.0,
            "cnctooldia": 0.4 / 25.4,
            "painttooldia": 0.0625,
            "paintoverlap": 0.15,
            "paintmargin": 0.01
        })

        self.form_kinds.update({
            "plot": "cb",
            "solid": "cb",
            "multicolored": "cb",
            "cutz": "entry_eval",
            "travelz": "entry_eval",
            "feedrate": "entry_eval",
            "cnctooldia": "entry_eval",
            "painttooldia": "entry_eval",
            "paintoverlap": "entry_eval",
            "paintmargin": "entry_eval"
        })

        # Attributes to be included in serialization
        # Always append to it because it carries contents
        # from predecessors.
        self.ser_attrs += ['options', 'kind']

    def scale(self, factor):
        if type(self.solid_geometry) == list:
            self.solid_geometry = [affinity.scale(g, factor, factor, origin=(0, 0))
                                   for g in self.solid_geometry]
        else:
            self.solid_geometry = affinity.scale(self.solid_geometry, factor, factor,
                                                 origin=(0, 0))

    def convert_units(self, units):
        factor = Geometry.convert_units(self, units)

        self.options['cutz'] *= factor
        self.options['travelz'] *= factor
        self.options['feedrate'] *= factor
        self.options['cnctooldia'] *= factor
        self.options['painttooldia'] *= factor
        self.options['paintmargin'] *= factor

        return factor

    def plot(self, figure):
        FlatCAMObj.plot(self, figure)
        #self.setup_axes(figure)

        try:
            _ = iter(self.solid_geometry)
        except TypeError:
            self.solid_geometry = [self.solid_geometry]

        for geo in self.solid_geometry:

            if type(geo) == Polygon:
                x, y = geo.exterior.coords.xy
                self.axes.plot(x, y, 'r-')
                for ints in geo.interiors:
                    x, y = ints.coords.xy
                    self.axes.plot(x, y, 'r-')
                continue

            if type(geo) == LineString or type(geo) == LinearRing:
                x, y = geo.coords.xy
                self.axes.plot(x, y, 'r-')
                continue

            if type(geo) == MultiPolygon:
                for poly in geo:
                    x, y = poly.exterior.coords.xy
                    self.axes.plot(x, y, 'r-')
                    for ints in poly.interiors:
                        x, y = ints.coords.xy
                        self.axes.plot(x, y, 'r-')
                continue

            print "WARNING: Did not plot:", str(type(geo))

        self.app.on_zoom_fit(None)
        self.app.canvas.queue_draw()


########################################
##                App                 ##
########################################
class App:
    """
    The main application class. The constructor starts the GUI.
    """

    def __init__(self):
        """
        Starts the application.

        :return: app
        :rtype: App
        """

        # Needed to interact with the GUI from other threads.
        GObject.threads_init()

        ## GUI ##
        self.gladefile = "FlatCAM.ui"
        self.builder = Gtk.Builder()
        self.builder.add_from_file(self.gladefile)
        self.window = self.builder.get_object("window1")
        self.window.set_title("FlatCAM")
        self.position_label = self.builder.get_object("label3")
        self.grid = self.builder.get_object("grid1")
        self.notebook = self.builder.get_object("notebook1")
        self.info_label = self.builder.get_object("label_status")
        self.progress_bar = self.builder.get_object("progressbar")
        self.progress_bar.set_show_text(True)
        self.units_label = self.builder.get_object("label_units")

        # White (transparent) background on the "Options" tab.
        self.builder.get_object("vp_options").override_background_color(Gtk.StateType.NORMAL,
                                                                        Gdk.RGBA(1, 1, 1, 1))

        # Combo box to choose between project and application options.
        self.combo_options = self.builder.get_object("combo_options")
        self.combo_options.set_active(1)

        ## Event handling ##
        self.builder.connect_signals(self)

        ## Make plot area ##
        self.figure = None
        self.axes = None
        self.canvas = None
        self.setup_plot()

        self.setup_project_list()  # The "Project" tab
        self.setup_component_editor()  # The "Selected" tab

        #### DATA ####
        self.setup_obj_classes()
        self.stuff = {}    # FlatCAMObj's by name
        self.mouse = None  # Mouse coordinates over plot

        # What is selected by the user. It is
        # a key if self.stuff
        self.selected_item_name = None

        # Used to inhibit the on_options_update callback when
        # the options are being changed by the program and not the user.
        self.options_update_ignore = False

        self.toggle_units_ignore = False

        self.defaults = {
            "units": "in"
        }  # Application defaults

        ## Current Project ##
        self.options = {}  # Project options
        self.project_filename = None

        self.form_kinds = {
            "units": "radio"
        }

        self.radios = {"units": {"rb_inch": "IN", "rb_mm": "MM"},
                       "gerber_gaps": {"rb_app_2tb": "tb", "rb_app_2lr": "lr", "rb_app_4": "4"}}
        self.radios_inv = {"units": {"IN": "rb_inch", "MM": "rb_mm"},
                           "gerber_gaps": {"tb": "rb_app_2tb", "lr": "rb_app_2lr", "4": "rb_app_4"}}

        # self.combos = []

        # Options for each kind of FlatCAMObj.
        # Example: 'gerber_plot': 'cb'. The widget name would be: 'cb_app_gerber_plot'
        for FlatCAMClass in [FlatCAMExcellon, FlatCAMGeometry, FlatCAMGerber, FlatCAMCNCjob]:
            obj = FlatCAMClass("no_name")
            for option in obj.form_kinds:
                self.form_kinds[obj.kind + "_" + option] = obj.form_kinds[option]
                # if obj.form_kinds[option] == "radio":
                #     self.radios.update({obj.kind + "_" + option: obj.radios[option]})
                #     self.radios_inv.update({obj.kind + "_" + option: obj.radios_inv[option]})

        self.plot_click_subscribers = {}

        # Initialization
        self.load_defaults()
        self.options.update(self.defaults)  # Copy app defaults to project options
        self.options2form()  # Populate the app defaults form
        self.units_label.set_text("[" + self.options["units"] + "]")

        # For debugging only
        def someThreadFunc(self):
            print "Hello World!"

        t = threading.Thread(target=someThreadFunc, args=(self,))
        t.start()

        ########################################
        ##              START                 ##
        ########################################
        self.window.set_default_size(900, 600)
        self.window.show_all()

    def setup_plot(self):
        """
        Sets up the main plotting area by creating a Matplotlib
        figure in self.canvas, adding axes and configuring them.
        These axes should not be ploted on and are just there to
        display the axes ticks and grid.

        :return: None
        :rtype: None
        """

        self.figure = Figure(dpi=50)
        self.axes = self.figure.add_axes([0.05, 0.05, 0.9, 0.9], label="base", alpha=0.0)
        self.axes.set_aspect(1)
        #t = arange(0.0,5.0,0.01)
        #s = sin(2*pi*t)
        #self.axes.plot(t,s)
        self.axes.grid(True)
        self.figure.patch.set_visible(False)

        self.canvas = FigureCanvas(self.figure)  # a Gtk.DrawingArea
        self.canvas.set_hexpand(1)
        self.canvas.set_vexpand(1)

        # Events
        self.canvas.mpl_connect('button_press_event', self.on_click_over_plot)
        self.canvas.mpl_connect('motion_notify_event', self.on_mouse_move_over_plot)
        self.canvas.set_can_focus(True)  # For key press
        self.canvas.mpl_connect('key_press_event', self.on_key_over_plot)
        #self.canvas.mpl_connect('scroll_event', self.on_scroll_over_plot)
        self.canvas.connect("configure-event", self.on_canvas_configure)

        self.grid.attach(self.canvas, 0, 0, 600, 400)

    def setup_obj_classes(self):
        """
        Sets up application specifics on the FlatCAMObj class.

        :return: None
        """
        FlatCAMObj.app = self

    def setup_project_list(self):
        """
        Sets up list or Tree where whatever has been loaded or created is
        displayed.

        :return: None
        """

        self.store = Gtk.ListStore(str)
        self.tree = Gtk.TreeView(self.store)
        #self.list = Gtk.ListBox()
        self.tree.connect("row_activated", self.on_row_activated)
        self.tree_select = self.tree.get_selection()
        self.signal_id = self.tree_select.connect("changed", self.on_tree_selection_changed)
        renderer = Gtk.CellRendererText()
        column = Gtk.TreeViewColumn("Title", renderer, text=0)
        self.tree.append_column(column)
        self.builder.get_object("box_project").pack_start(self.tree, False, False, 1)

    def setup_component_editor(self):
        """
        Initial configuration of the component editor. Creates
        a page titled "Selection" on the notebook on the left
        side of the main window.

        :return: None
        """

        box_selected = self.builder.get_object("box_selected")

        # Remove anything else in the box
        box_children = box_selected.get_children()
        for child in box_children:
            box_selected.remove(child)

        box1 = Gtk.Box(Gtk.Orientation.VERTICAL)
        label1 = Gtk.Label("Choose an item from Project")
        box1.pack_start(label1, True, False, 1)
        box_selected.pack_start(box1, True, True, 0)
        #box_selected.show()
        box1.show()
        label1.show()

    def info(self, text):
        """
        Show text on the status bar.

        :param text: Text to display.
        :type text: str
        :return: None
        """
        self.info_label.set_text(text)

    def zoom(self, factor, center=None):
        """
        Zooms the plot by factor around a given
        center point. Takes care of re-drawing.

        :param factor: Number by which to scale the plot.
        :type factor: float
        :param center: Coordinates [x, y] of the point around which to scale the plot.
        :type center: list
        :return: None
        """
        xmin, xmax = self.axes.get_xlim()
        ymin, ymax = self.axes.get_ylim()
        width = xmax - xmin
        height = ymax - ymin

        if center is None:
            center = [(xmin + xmax) / 2.0, (ymin + ymax) / 2.0]

        # For keeping the point at the pointer location
        relx = (xmax - center[0]) / width
        rely = (ymax - center[1]) / height

        new_width = width / factor
        new_height = height / factor

        xmin = center[0] - new_width * (1 - relx)
        xmax = center[0] + new_width * relx
        ymin = center[1] - new_height * (1 - rely)
        ymax = center[1] + new_height * rely

        for name in self.stuff:
            self.stuff[name].axes.set_xlim((xmin, xmax))
            self.stuff[name].axes.set_ylim((ymin, ymax))
        self.axes.set_xlim((xmin, xmax))
        self.axes.set_ylim((ymin, ymax))

        self.canvas.queue_draw()

    def build_list(self):
        """
        Clears and re-populates the list of objects in currently
        in the project.

        :return: None
        """
        print "build_list(): clearing"
        self.tree_select.unselect_all()
        self.store.clear()
        print "repopulating...",
        for key in self.stuff:
            print key,
            self.store.append([key])
        print

    def get_radio_value(self, radio_set):
        """
        Returns the radio_set[key] of the radiobutton
        whose name is key is active.

        :param radio_set: A dictionary containing widget_name: value pairs.
        :type radio_set: dict
        :return: radio_set[key]
        """

        for name in radio_set:
            if self.builder.get_object(name).get_active():
                return radio_set[name]

    def plot_all(self):
        """
        Re-generates all plots from all objects.

        :return: None
        """
        self.clear_plots()
        self.set_progress_bar(0.1, "Re-plotting...")

        def thread_func(app_obj):
            percentage = 0.1
            try:
                delta = 0.9 / len(self.stuff)
            except ZeroDivisionError:
                GLib.timeout_add(300, lambda: app_obj.set_progress_bar(0.0, ""))
                return
            for i in self.stuff:
                self.stuff[i].plot(self.figure)
                percentage += delta
                GLib.idle_add(lambda: app_obj.set_progress_bar(percentage, "Re-plotting..."))

            self.on_zoom_fit(None)
            self.axes.grid(True)
            self.canvas.queue_draw()
            GLib.timeout_add(300, lambda: app_obj.set_progress_bar(0.0, ""))

        t = threading.Thread(target=thread_func, args=(self,))
        t.daemon = True
        t.start()

    def clear_plots(self):
        """
        Clears self.axes and self.figure.

        :return: None
        """

        # TODO: Create a setup_axes method that gets called here and in setup_plot?
        self.axes.cla()
        self.figure.clf()
        self.figure.add_axes(self.axes)
        self.axes.set_aspect(1)
        self.axes.grid(True)
        self.canvas.queue_draw()

    def get_eval(self, widget_name):
        """
        Runs eval() on the on the text entry of name 'widget_name'
        and returns the results.

        :param widget_name: Name of Gtk.Entry
        :type widget_name: str
        :return: Depends on contents of the entry text.
        """

        value = self.builder.get_object(widget_name).get_text()
        if value == "":
            value = "None"
        try:
            evald = eval(value)
            return evald
        except:
            self.info("Could not evaluate: " + value)
            return None

    def set_list_selection(self, name):
        """
        Marks a given object as selected in the list ob objects
        in the GUI. This selection will in turn trigger
        ``self.on_tree_selection_changed()``.

        :param name: Name of the object.
        :type name: str
        :return: None
        """

        iter = self.store.get_iter_first()
        while iter is not None and self.store[iter][0] != name:
            iter = self.store.iter_next(iter)
        self.tree_select.unselect_all()
        self.tree_select.select_iter(iter)

        # Need to return False such that GLib.idle_add
        # or .timeout_add do not repear.
        return False

    def new_object(self, kind, name, initialize):
        """
        Creates a new specalized FlatCAMObj and attaches it to the application,
        this is, updates the GUI accordingly, any other records and plots it.

        :param kind: The kind of object to create. One of 'gerber',
         'excellon', 'cncjob' and 'geometry'.
        :type kind: str
        :param name: Name for the object.
        :type name: str
        :param initialize: Function to run after creation of the object
         but before it is attached to the application. The function is
         called with 2 parameters: the new object and the App instance.
        :type initialize: function
        :return: None
        :rtype: None
        """

        # Check for existing name
        if name in self.stuff:
            self.info("Rename " + name + " in project first.")
            return None

        # Create object
        classdict = {
            "gerber": FlatCAMGerber,
            "excellon": FlatCAMExcellon,
            "cncjob": FlatCAMCNCjob,
            "geometry": FlatCAMGeometry
        }
        obj = classdict[kind](name)
        obj.units = self.options["units"]  # TODO: The constructor should look at defaults.

        # Initialize as per user request
        # User must take care to implement initialize
        # in a thread-safe way as is is likely that we
        # have been invoked in a separate thread.
        initialize(obj, self)

        # Check units and convert if necessary
        if self.options["units"].upper() != obj.units.upper():
            GLib.idle_add(lambda: self.info("Converting units to " + self.options["units"] + "."))
            obj.convert_units(self.options["units"])

        # Set default options from self.options
        for option in self.options:
            if option.find(kind + "_") == 0:
                oname = option[len(kind)+1:]
                obj.options[oname] = self.options[option]

        # Add to our records
        self.stuff[name] = obj

        # Update GUI list and select it (Thread-safe?)
        self.store.append([name])
        #self.build_list()
        GLib.idle_add(lambda: self.set_list_selection(name))
        # TODO: Gtk.notebook.set_current_page is not known to
        # TODO: return False. Fix this??
        GLib.timeout_add(100, lambda: self.notebook.set_current_page(1))

        # Plot
        # TODO: (Thread-safe?)
        obj.plot(self.figure)
        obj.axes.set_alpha(0.0)
        self.on_zoom_fit(None)

        return obj

    def set_progress_bar(self, percentage, text=""):
        """
        Sets the application's progress bar to a given fraction and text.

        :param percentage: The fraction (0.0-1.0) of the progress.
        :type percentage: float
        :param text: Text to display on the progress bar.
        :type text: str
        :return:
        """
        self.progress_bar.set_text(text)
        self.progress_bar.set_fraction(percentage)
        return False

    def save_project(self):
        return

    def get_current(self):
        """
        Returns the currently selected FlatCAMObj in the application.

        :return: Currently selected FlatCAMObj in the application.
        :rtype: FlatCAMObj or None
        """
        try:
            return self.stuff[self.selected_item_name]
        except:
            return None

    def adjust_axes(self, xmin, ymin, xmax, ymax):
        """
        Adjusts axes of all plots while maintaining the use of the whole canvas
        and an aspect ratio to 1:1 between x and y axes. The parameters are an original
        request that will be modified to fit these restrictions.

        :param xmin: Requested minimum value for the X axis.
        :type xmin: float
        :param ymin: Requested minimum value for the Y axis.
        :type ymin: float
        :param xmax: Requested maximum value for the X axis.
        :type xmax: float
        :param ymax: Requested maximum value for the Y axis.
        :type ymax: float
        :return: None
        """
        m_x = 15  # pixels
        m_y = 25  # pixels
        width = xmax - xmin
        height = ymax - ymin
        r = width / height
        Fw, Fh = self.canvas.get_width_height()
        Fr = float(Fw) / Fh
        x_ratio = float(m_x) / Fw
        y_ratio = float(m_y) / Fh

        if r > Fr:
            ycenter = (ymin + ymax) / 2.0
            newheight = height * r / Fr
            ymin = ycenter - newheight / 2.0
            ymax = ycenter + newheight / 2.0
        else:
            xcenter = (xmax + ymin) / 2.0
            newwidth = width * Fr / r
            xmin = xcenter - newwidth / 2.0
            xmax = xcenter + newwidth / 2.0

        for name in self.stuff:
            if self.stuff[name].axes is None:
                continue
            self.stuff[name].axes.set_xlim((xmin, xmax))
            self.stuff[name].axes.set_ylim((ymin, ymax))
            self.stuff[name].axes.set_position([x_ratio, y_ratio,
                                                1 - 2 * x_ratio, 1 - 2 * y_ratio])
        self.axes.set_xlim((xmin, xmax))
        self.axes.set_ylim((ymin, ymax))
        self.axes.set_position([x_ratio, y_ratio,
                                1 - 2 * x_ratio, 1 - 2 * y_ratio])

        self.canvas.queue_draw()

    def load_defaults(self):
        """
        Loads the aplication's default settings from defaults.json into
        ``self.defaults``.

        :return: None
        """
        try:
            f = open("defaults.json")
            options = f.read()
            f.close()
        except:
            self.info("ERROR: Could not load defaults file.")
            return

        try:
            defaults = json.loads(options)
        except:
            e = sys.exc_info()[0]
            print e
            self.info("ERROR: Failed to parse defaults file.")
            return
        self.defaults.update(defaults)

    def read_form(self):
        """
        Reads the options form into self.defaults/self.options.

        :return: None
        :rtype: None
        """
        combo_sel = self.combo_options.get_active()
        options_set = [self.options, self.defaults][combo_sel]
        for option in options_set:
            self.read_form_item(option, options_set)

    def read_form_item(self, name, dest):
        """
        Reads the value of a form item in the defaults/options form and
        saves it to the corresponding dictionary.

        :param name: Name of the form item. A key in ``self.defaults`` or
            ``self.options``.
        :type name: str
        :param dest: Dictionary to which to save the value.
        :type dest: dict
        :return: None
        """
        fkind = self.form_kinds[name]
        fname = fkind + "_" + "app" + "_" + name

        if fkind == 'entry_text':
            dest[name] = self.builder.get_object(fname).get_text()
            return
        if fkind == 'entry_eval':
            dest[name] = self.get_eval(fname)
            return
        if fkind == 'cb':
            dest[name] = self.builder.get_object(fname).get_active()
            return
        if fkind == 'radio':
            dest[name] = self.get_radio_value(self.radios[name])
            return
        print "Unknown kind of form item:", fkind

    def options2form(self):
        """
        Sets the 'Project Options' or 'Application Defaults' form with values from
        ``self.options`` or ``self.defaults``.

        :return: None
        :rtype: None
        """

        # Set the on-change callback to do nothing while we do the changes.
        self.options_update_ignore = True
        self.toggle_units_ignore = True

        combo_sel = self.combo_options.get_active()
        options_set = [self.options, self.defaults][combo_sel]
        for option in options_set:
            self.set_form_item(option, options_set[option])

        self.options_update_ignore = False
        self.toggle_units_ignore = False

    def set_form_item(self, name, value):
        """
        Sets a form item 'name' in the GUI with the given 'value'. The syntax of
        form names in the GUI is <kind>_app_<name>, where kind is one of: rb (radio button),
        cb (check button), entry_eval or entry_text (entry), combo (combo box). name is
        whatever name it's been given. For self.defaults, name is a key in the dictionary.

        :param name: Name of the form field.
        :type name: str
        :param value: The value to set the form field to.
        :type value: Depends on field kind.
        :return: None
        """
        if name not in self.form_kinds:
            print "WARNING: Tried to set unknown option/form item:", name
            return
        fkind = self.form_kinds[name]
        fname = fkind + "_" + "app" + "_" + name
        if fkind == 'entry_eval' or fkind == 'entry_text':
            try:
                self.builder.get_object(fname).set_text(str(value))
            except:
                print "ERROR: Failed to set value of %s to %s" % (fname, str(value))
            return
        if fkind == 'cb':
            try:
                self.builder.get_object(fname).set_active(value)
            except:
                print "ERROR: Failed to set value of %s to %s" % (fname, str(value))
            return
        if fkind == 'radio':
            try:
                self.builder.get_object(self.radios_inv[name][value]).set_active(True)
            except:
                print "ERROR: Failed to set value of %s to %s" % (fname, str(value))
            return
        print "Unknown kind of form item:", fkind

    def save_project(self, filename):
        """
        Saves the current project to the specified file.

        :param filename: Name of the file in which to save.
        :type filename: str
        :return: None
        """

        # Captura the latest changes
        try:
            self.get_current().read_form()
        except:
            pass

        d = {"objs": [self.stuff[o].to_dict() for o in self.stuff],
             "options": self.options}

        try:
            f = open(filename, 'w')
        except:
            print "ERROR: Failed to open file for saving:", filename
            return

        try:
            json.dump(d, f, default=to_dict)
        except:
            print "ERROR: File open but failed to write:", filename
            f.close()
            return

        f.close()

    def open_project(self, filename):
        """
        Loads a project from the specified file.

        :param filename:  Name of the file from which to load.
        :type filename: str
        :return: None
        """

        try:
            f = open(filename, 'r')
        except:
            print "WARNING: Failed to open project file:", filename
            return

        try:
            d = json.load(f, object_hook=dict2obj)
        except:
            print "WARNING: Failed to parse project file:", filename
            f.close()

        # Clear the current project
        self.on_file_new(None)

        # Project options
        self.options.update(d['options'])
        self.project_filename = filename
        self.units_label.set_text(self.options["units"])

        # Re create objects
        for obj in d['objs']:
            def obj_init(obj_inst, app_inst):
                obj_inst.from_dict(obj)
            self.new_object(obj['kind'], obj['options']['name'], obj_init)

        self.info("Project loaded from: " + filename)

    ########################################
    ##         EVENT HANDLERS             ##
    ########################################
    def on_toggle_units(self, widget):
        if self.toggle_units_ignore:
            return

        combo_sel = self.combo_options.get_active()
        options_set = [self.options, self.defaults][combo_sel]

        # Options to scale
        dimensions = ['gerber_isotooldia', 'gerber_cutoutmargin', 'gerber_cutoutgapsize',
                      'gerber_noncoppermargin', 'gerber_bboxmargin', 'excellon_drillz',
                      'excellon_travelz', 'excellon_feedrate', 'cncjob_tooldia',
                      'geometry_cutz', 'geometry_travelz', 'geometry_feedrate',
                      'geometry_cnctooldia', 'geometry_painttooldia', 'geometry_paintoverlap',
                      'geometry_paintmargin']

        def scale_options(factor):
            for dim in dimensions:
                options_set[dim] *= factor

        factor = 1/25.4
        if self.builder.get_object('rb_mm').get_active():
            factor = 25.4

        # App units. Convert without warning.
        if combo_sel == 1:
            self.read_form()
            scale_options(factor)
            self.options2form()
            return

        label = Gtk.Label("Changing the units of the project causes all geometrical \n" + \
                            "properties of all objects to be scaled accordingly. Continue?")
        dialog = Gtk.Dialog("Changing Project Units", self.window, 0,
                            (Gtk.STOCK_CANCEL, Gtk.ResponseType.CANCEL,
                             Gtk.STOCK_OK, Gtk.ResponseType.OK))
        dialog.set_default_size(150, 100)
        dialog.set_modal(True)
        box = dialog.get_content_area()
        box.set_border_width(10)
        box.add(label)
        dialog.show_all()
        response = dialog.run()
        dialog.destroy()

        if response == Gtk.ResponseType.OK:
            print "Converting units..."
            print "Converting options..."
            self.read_form()
            scale_options(factor)
            self.options2form()
            for obj in self.stuff:
                units = self.get_radio_value({"rb_mm": "MM", "rb_inch": "IN"})
                print "Converting ", obj, " to ", units
                self.stuff[obj].convert_units(units)
            current = self.get_current()
            if current is not None:
                current.to_form()
            self.plot_all()
        else:
            # Undo toggling
            self.toggle_units_ignore = True
            if self.builder.get_object('rb_mm').get_active():
                self.builder.get_object('rb_inch').set_active(True)
            else:
                self.builder.get_object('rb_mm').set_active(True)
            self.toggle_units_ignore = False

        self.read_form()
        self.units_label.set_text("[" + self.options["units"] + "]")

    def on_file_openproject(self, param):
        """
        Callback for menu item File->Open Project. Opens a file chooser and calls
        ``self.open_project()`` after successful selection of a filename.

        :param param: Ignored.
        :return: None
        """
        def on_success(app_obj, filename):
            app_obj.open_project(filename)

        self.file_chooser_action(on_success)

    def on_file_saveproject(self, param):
        """
        Callback for menu item File->Save Project. Saves the project to
        ``self.project_filename`` or calls ``self.on_file_saveprojectas()``
        if set to None. The project is saved by calling ``self.save_project()``.

        :param param: Ignored.
        :return: None
        """
        if self.project_filename is None:
            self.on_file_saveprojectas(None)
        else:
            self.save_project(self.project_filename)
            self.info("Project saved to: " + self.project_filename)

    def on_file_saveprojectas(self, param):
        """
        Callback for menu item File->Save Project As... Opens a file
        chooser and saves the project to the given file via
        ``self.save_project()``.

        :param param: Ignored.
        :return: None
        """
        def on_success(app_obj, filename):
            assert isinstance(app_obj, App)
            app_obj.save_project(filename)
            self.project_filename = filename
            app_obj.info("Project saved to: " + filename)

        self.file_chooser_save_action(on_success)

    def on_file_saveprojectcopy(self, param):
        """
        Callback for menu item File->Save Project Copy... Opens a file
        chooser and saves the project to the given file via
        ``self.save_project``. It does not update ``self.project_filename`` so
        subsequent save requests are done on the previous known filename.

        :param param: Ignore.
        :return: None
        """
        def on_success(app_obj, filename):
            assert isinstance(app_obj, App)
            app_obj.save_project(filename)
            app_obj.info("Project copy saved to: " + filename)

        self.file_chooser_save_action(on_success)

    def on_options_app2project(self, param):
        """
        Callback for Options->Transfer Options->App=>Project. Copies options
        from application defaults to project defaults.

        :param param: Ignored.
        :return: None
        """
        self.options.update(self.defaults)
        self.options2form()  # Update UI

    def on_options_project2app(self, param):
        """
        Callback for Options->Transfer Options->Project=>App. Copies options
        from project defaults to application defaults.

        :param param: Ignored.
        :return: None
        """
        self.defaults.update(self.options)
        self.options2form()  # Update UI

    def on_options_project2object(self, param):
        """
        Callback for Options->Transfer Options->Project=>Object. Copies options
        from project defaults to the currently selected object.

        :param param: Ignored.
        :return: None
        """
        obj = self.get_current()
        if obj is None:
            print "WARNING: No object selected."
            return
        for option in self.options:
            if option.find(obj.kind + "_") == 0:
                oname = option[len(obj.kind)+1:]
                obj.options[oname] = self.options[option]
        obj.to_form()  # Update UI

    def on_options_object2project(self, param):
        """
        Callback for Options->Transfer Options->Object=>Project. Copies options
        from the currently selected object to project defaults.

        :param param: Ignored.
        :return: None
        """
        obj = self.get_current()
        if obj is None:
            print "WARNING: No object selected."
            return
        obj.read_form()
        for option in obj.options:
            if option in ['name']:  # TODO: Handle this better...
                continue
            self.options[obj.kind + "_" + option] = obj.options[option]
        self.options2form()  # Update UI

    def on_options_object2app(self, param):
        """
        Callback for Options->Transfer Options->Object=>App. Copies options
        from the currently selected object to application defaults.

        :param param: Ignored.
        :return: None
        """
        obj = self.get_current()
        if obj is None:
            print "WARNING: No object selected."
            return
        obj.read_form()
        for option in obj.options:
            if option in ['name']:  # TODO: Handle this better...
                continue
            self.defaults[obj.kind + "_" + option] = obj.options[option]
        self.options2form()  # Update UI

    def on_options_app2object(self, param):
        """
        Callback for Options->Transfer Options->App=>Object. Copies options
        from application defaults to the currently selected object.

        :param param: Ignored.
        :return: None
        """
        obj = self.get_current()
        if obj is None:
            print "WARNING: No object selected."
            return
        for option in self.defaults:
            if option.find(obj.kind + "_") == 0:
                oname = option[len(obj.kind)+1:]
                obj.options[oname] = self.defaults[option]
        obj.to_form()  # Update UI

    def on_file_savedefaults(self, param):
        """
        Callback for menu item File->Save Defaults. Saves application default options
        ``self.defaults`` to defaults.json.

        :param param: Ignored.
        :return: None
        """
        try:
            f = open("defaults.json")
            options = f.read()
            f.close()
        except:
            self.info("ERROR: Could not load defaults file.")
            return

        try:
            defaults = json.loads(options)
        except:
            e = sys.exc_info()[0]
            print e
            self.info("ERROR: Failed to parse defaults file.")
            return

        assert isinstance(defaults, dict)
        defaults.update(self.defaults)

        try:
            f = open("defaults.json", "w")
            json.dump(defaults, f)
            f.close()
        except:
            self.info("ERROR: Failed to write defaults to file.")
            return

        self.info("Defaults saved.")

    def on_options_combo_change(self, widget):
        """
        Called when the combo box to choose between application defaults and
        project option changes value. The corresponding variables are
        copied to the UI.

        :param widget: The widget from which this was called. Ignore.
        :return: None
        """
        combo_sel = self.combo_options.get_active()
        print "Options --> ", combo_sel
        self.options2form()

    def on_options_update(self, widget):
        """
        Called whenever a value in the options/defaults form changes.
        All values are updated. Can be inhibited by setting ``self.options_update_ignore = True``,
        which may be necessary when updating the UI from code and not by the user.

        :param widget: The widget from which this was called. Ignore.
        :return: None
        """
        if self.options_update_ignore:
            return
        self.read_form()

    def on_scale_object(self, widget):
        """
        Callback for request to change an objects geometry scale. The object
        is re-scaled and replotted.

        :param widget: Ignored.
        :return: None
        """
        obj = self.get_current()
        assert isinstance(obj, FlatCAMObj)
        factor = self.get_eval("entry_eval_" + obj.kind + "_scalefactor")
        obj.scale(factor)
        obj.to_form()
        self.on_update_plot(None)

    def on_canvas_configure(self, widget, event):
        """
        Called whenever the canvas changes size. The axes are updated such
        as to use the whole canvas.

        :param widget: Ignored.
        :param event: Ignored.
        :return: None
        """
        print "on_canvas_configure()"

        xmin, xmax = self.axes.get_xlim()
        ymin, ymax = self.axes.get_ylim()
        self.adjust_axes(xmin, ymin, xmax, ymax)

    def on_row_activated(self, widget, path, col):
        """
        Callback for selection activation (Enter or double-click) on the Project list.
        Switches the notebook page to the object properties form. Calls
        ``self.notebook.set_current_page(1)``.

        :param widget: Ignored.
        :param path: Ignored.
        :param col: Ignored.
        :return: None
        """
        self.notebook.set_current_page(1)

    def on_generate_gerber_bounding_box(self, widget):
        """
        Callback for request from the Gerber form to generate a bounding box for the
        geometry in the object. Creates a FlatCAMGeometry with the bounding box.

        :param widget: Ignored.
        :return: None
        """
        gerber = self.get_current()
        gerber.read_form()
        name = self.selected_item_name + "_bbox"

        def geo_init(geo_obj, app_obj):
            assert isinstance(geo_obj, FlatCAMGeometry)
            bounding_box = gerber.solid_geometry.envelope.buffer(gerber.options["bboxmargin"])
            if not gerber.options["bboxrounded"]:
                bounding_box = bounding_box.envelope
            geo_obj.solid_geometry = bounding_box

        self.new_object("geometry", name, geo_init)

    def on_update_plot(self, widget):
        """
        Callback for button on form for all kinds of objects.
        Re-plots the current object only.

        :param widget: The widget from which this was called.
        :return: None
        """
        print "Re-plotting"

        self.get_current().read_form()
        self.set_progress_bar(0.5, "Plotting...")
        #GLib.idle_add(lambda: self.set_progress_bar(0.5, "Plotting..."))

        def thread_func(app_obj):
            assert isinstance(app_obj, App)
            #GLib.idle_add(lambda: app_obj.set_progress_bar(0.5, "Plotting..."))
            #GLib.idle_add(lambda: app_obj.get_current().plot(app_obj.figure))
            app_obj.get_current().plot(app_obj.figure)
            GLib.idle_add(lambda: app_obj.on_zoom_fit(None))
            GLib.timeout_add(300, lambda: app_obj.set_progress_bar(0.0, ""))

        t = threading.Thread(target=thread_func, args=(self,))
        t.daemon = True
        t.start()

    def on_generate_excellon_cncjob(self, widget):
        """
        Callback for button active/click on Excellon form to
        create a CNC Job for the Excellon file.

        :param widget: The widget from which this was called.
        :return: None
        """

        job_name = self.selected_item_name + "_cnc"
        excellon = self.get_current()
        assert isinstance(excellon, FlatCAMExcellon)
        excellon.read_form()

        # Object initialization function for app.new_object()
        def job_init(job_obj, app_obj):
            excellon_ = self.get_current()
            assert isinstance(excellon_, FlatCAMExcellon)
            assert isinstance(job_obj, FlatCAMCNCjob)

            GLib.idle_add(lambda: app_obj.set_progress_bar(0.2, "Creating CNC Job..."))
            job_obj.z_cut = excellon_.options["drillz"]
            job_obj.z_move = excellon_.options["travelz"]
            job_obj.feedrate = excellon_.options["feedrate"]
            # There could be more than one drill size...
            # job_obj.tooldia =   # TODO: duplicate variable!
            # job_obj.options["tooldia"] =
            job_obj.generate_from_excellon_by_tool(excellon_, excellon_.options["toolselection"])

            GLib.idle_add(lambda: app_obj.set_progress_bar(0.5, "Parsing G-Code..."))
            job_obj.gcode_parse()

            GLib.idle_add(lambda: app_obj.set_progress_bar(0.6, "Creating New Geometry..."))
            job_obj.create_geometry()

            GLib.idle_add(lambda: app_obj.set_progress_bar(0.8, "Plotting..."))

        # To be run in separate thread
        def job_thread(app_obj):
            app_obj.new_object("cncjob", job_name, job_init)
            GLib.idle_add(lambda: app_obj.set_progress_bar(1.0, "Done!"))
            GLib.timeout_add_seconds(1, lambda: app_obj.set_progress_bar(0.0, ""))

        # Start the thread
        t = threading.Thread(target=job_thread, args=(self,))
        t.daemon = True
        t.start()

    def on_excellon_tool_choose(self, widget):
        """
        Callback for button on Excellon form to open up a window for
        selecting tools.

        :param widget: The widget from which this was called.
        :return: None
        """
        excellon = self.get_current()
        assert isinstance(excellon, FlatCAMExcellon)
        excellon.show_tool_chooser()

    def on_entry_eval_activate(self, widget):
        """
        Called when an entry is activated (eg. by hitting enter) if
        set to do so. Its text is eval()'d and set to the returned value.
        The current object is updated.

        :param widget:
        :return:
        """
        self.on_eval_update(widget)
        obj = self.get_current()
        assert isinstance(obj, FlatCAMObj)
        obj.read_form()

    def on_gerber_generate_noncopper(self, widget):
        """
        Callback for button on Gerber form to create a geometry object
        with polygons covering the area without copper or negative of the
        Gerber.

        :param widget: The widget from which this was called.
        :return: None
        """
        name = self.selected_item_name + "_noncopper"

        def geo_init(geo_obj, app_obj):
            assert isinstance(geo_obj, FlatCAMGeometry)
            gerber = app_obj.stuff[app_obj.selected_item_name]
            assert isinstance(gerber, FlatCAMGerber)
            gerber.read_form()
            bounding_box = gerber.solid_geometry.envelope.buffer(gerber.options["noncoppermargin"])
            non_copper = bounding_box.difference(gerber.solid_geometry)
            geo_obj.solid_geometry = non_copper

        # TODO: Check for None
        self.new_object("geometry", name, geo_init)

    def on_gerber_generate_cutout(self, widget):
        """
        Callback for button on Gerber form to create geometry with lines
        for cutting off the board.

        :param widget: The widget from which this was called.
        :return: None
        """
        name = self.selected_item_name + "_cutout"

        def geo_init(geo_obj, app_obj):
            # TODO: get from object
            margin = app_obj.get_eval("entry_eval_gerber_cutoutmargin")
            gap_size = app_obj.get_eval("entry_eval_gerber_cutoutgapsize")
            gerber = app_obj.stuff[app_obj.selected_item_name]
            minx, miny, maxx, maxy = gerber.bounds()
            minx -= margin
            maxx += margin
            miny -= margin
            maxy += margin
            midx = 0.5 * (minx + maxx)
            midy = 0.5 * (miny + maxy)
            hgap = 0.5 * gap_size
            pts = [[midx - hgap, maxy],
                   [minx, maxy],
                   [minx, midy + hgap],
                   [minx, midy - hgap],
                   [minx, miny],
                   [midx - hgap, miny],
                   [midx + hgap, miny],
                   [maxx, miny],
                   [maxx, midy - hgap],
                   [maxx, midy + hgap],
                   [maxx, maxy],
                   [midx + hgap, maxy]]
            cases = {"tb": [[pts[0], pts[1], pts[4], pts[5]],
                            [pts[6], pts[7], pts[10], pts[11]]],
                     "lr": [[pts[9], pts[10], pts[1], pts[2]],
                            [pts[3], pts[4], pts[7], pts[8]]],
                     "4": [[pts[0], pts[1], pts[2]],
                           [pts[3], pts[4], pts[5]],
                           [pts[6], pts[7], pts[8]],
                           [pts[9], pts[10], pts[11]]]}
            cuts = cases[app.get_radio_value({"rb_2tb": "tb", "rb_2lr": "lr", "rb_4": "4"})]
            geo_obj.solid_geometry = cascaded_union([LineString(segment) for segment in cuts])

        # TODO: Check for None
        self.new_object("geometry", name, geo_init)

    def on_eval_update(self, widget):
        """
        Modifies the content of a Gtk.Entry by running
        eval() on its contents and puting it back as a
        string.

        :param widget: The widget from which this was called.
        :return: None
        """
        # TODO: error handling here
        widget.set_text(str(eval(widget.get_text())))

    def on_generate_isolation(self, widget):
        """
        Callback for button on Gerber form to create isolation routing geometry.

        :param widget: The widget from which this was called.
        :return: None
        """
        print "Generating Isolation Geometry:"
        iso_name = self.selected_item_name + "_iso"

        def iso_init(geo_obj, app_obj):
            # TODO: Object must be updated on form change and the options
            # TODO: read from the object.
            tooldia = app_obj.get_eval("entry_eval_gerber_isotooldia")
            geo_obj.solid_geometry = self.get_current().isolation_geometry(tooldia / 2.0)

        # TODO: Do something if this is None. Offer changing name?
        self.new_object("geometry", iso_name, iso_init)

    def on_generate_cncjob(self, widget):
        """
        Callback for button on geometry form to generate CNC job.

        :param widget: The widget from which this was called.
        :return: None
        """
        print "Generating CNC job"
        job_name = self.selected_item_name + "_cnc"

        # Object initialization function for app.new_object()
        def job_init(job_obj, app_obj):
            assert isinstance(job_obj, FlatCAMCNCjob)
            geometry = app_obj.stuff[app_obj.selected_item_name]
            assert isinstance(geometry, FlatCAMGeometry)
            geometry.read_form()

            GLib.idle_add(lambda: app_obj.set_progress_bar(0.2, "Creating CNC Job..."))
            job_obj.z_cut = geometry.options["cutz"]
            job_obj.z_move = geometry.options["travelz"]
            job_obj.feedrate = geometry.options["feedrate"]
            job_obj.options["tooldia"] = geometry.options["cnctooldia"]

            GLib.idle_add(lambda: app_obj.set_progress_bar(0.4, "Analyzing Geometry..."))
            job_obj.generate_from_geometry(geometry)

            GLib.idle_add(lambda: app_obj.set_progress_bar(0.5, "Parsing G-Code..."))
            job_obj.gcode_parse()

            GLib.idle_add(lambda: app_obj.set_progress_bar(0.6, "Creating New Geometry..."))
            job_obj.create_geometry()

            GLib.idle_add(lambda: app_obj.set_progress_bar(0.8, "Plotting..."))

        # To be run in separate thread
        def job_thread(app_obj):
            app_obj.new_object("cncjob", job_name, job_init)
            GLib.idle_add(lambda: app_obj.set_progress_bar(1.0, "Done!"))
            GLib.timeout_add_seconds(1, lambda: app_obj.set_progress_bar(0.0, ""))

        # Start the thread
        t = threading.Thread(target=job_thread, args=(self,))
        t.daemon = True
        t.start()

    def on_generate_paintarea(self, widget):
        """
        Callback for button on geometry form.
        Subscribes to the "Click on plot" event and continues
        after the click. Finds the polygon containing
        the clicked point and runs clear_poly() on it, resulting
        in a new FlatCAMGeometry object.

        :param widget: The  widget from which this was called.
        :return: None
        """
        self.info("Click inside the desired polygon.")
        geo = self.get_current()
        geo.read_form()
        tooldia = geo.options["painttooldia"]
        overlap = geo.options["paintoverlap"]

        # To be called after clicking on the plot.
        def doit(event):
            self.plot_click_subscribers.pop("generate_paintarea")
            self.info("")
            point = [event.xdata, event.ydata]
            poly = find_polygon(geo.solid_geometry, point)

            # Initializes the new geometry object
            def gen_paintarea(geo_obj, app_obj):
                assert isinstance(geo_obj, FlatCAMGeometry)
                assert isinstance(app_obj, App)
                cp = clear_poly(poly.buffer(-geo.options["paintmargin"]), tooldia, overlap)
                geo_obj.solid_geometry = cp

            name = self.selected_item_name + "_paint"
            self.new_object("geometry", name, gen_paintarea)

        self.plot_click_subscribers["generate_paintarea"] = doit

    def on_cncjob_exportgcode(self, widget):
        """
        Called from button on CNCjob form to save the G-Code from the object.

        :param widget: The widget from which this was called.
        :return: None
        """
        def on_success(self, filename):
            cncjob = self.get_current()
            f = open(filename, 'w')
            f.write(cncjob.gcode)
            f.close()
            print "Saved to:", filename

        self.file_chooser_save_action(on_success)

    def on_delete(self, widget):
        """
        Delete the currently selected FlatCAMObj.

        :param widget: The widget from which this was called.
        :return: None
        """
        print "on_delete():", self.selected_item_name

        # Remove plot
        self.figure.delaxes(self.get_current().axes)
        self.canvas.queue_draw()

        # Remove from dictionary
        self.stuff.pop(self.selected_item_name)

        # Update UI
        self.build_list()  # Update the items list

    def on_replot(self, widget):
        """
        Callback for toolbar button. Re-plots all objects.

        :param widget: The widget from which this was called.
        :return: None
        """
        self.plot_all()

    def on_clear_plots(self, widget):
        """
        Callback for toolbar button. Clears all plots.

        :param widget: The widget from which this was called.
        :return: None
        """
        self.clear_plots()

    def on_activate_name(self, entry):
        """
        Hitting 'Enter' after changing the name of an item
        updates the item dictionary and re-builds the item list.

        :param entry: The widget from which this was called.
        :return: None
        """

        # Disconnect event listener
        self.tree.get_selection().disconnect(self.signal_id)

        new_name = entry.get_text()  # Get from form
        self.stuff[new_name] = self.stuff.pop(self.selected_item_name)  # Update dictionary
        self.stuff[new_name].options["name"] = new_name  # update object
        self.info('Name change: ' + self.selected_item_name + " to " + new_name)
        self.selected_item_name = new_name  # Update selection name

        self.build_list()  # Update the items list

        # Reconnect event listener
        self.signal_id = self.tree.get_selection().connect(
            "changed", self.on_tree_selection_changed)

    def on_tree_selection_changed(self, selection):
        """
        Callback for selection change in the project list. This changes
        the currently selected FlatCAMObj.

        :param selection: Selection associated to the project tree or list
        :type selection: Gtk.TreeSelection
        :return: None
        """
        print "on_tree_selection_change(): ",
        model, treeiter = selection.get_selected()

        if treeiter is not None:
            # Save data for previous selection
            obj = self.get_current()
            if obj is not None:
                obj.read_form()

            print "You selected", model[treeiter][0]
            self.selected_item_name = model[treeiter][0]
            obj_new = self.get_current()
            if obj_new is not None:
                GLib.idle_add(lambda: obj_new.build_ui())
        else:
            print "Nothing selected"
            self.selected_item_name = None
            self.setup_component_editor()

    def on_file_new(self, param):
        """
        Callback for menu item File->New. Returns the application to its
        startup state.

        :param param: Whatever is passed by the event. Ignore.
        :return: None
        """
        # Remove everythong from memory
        # Clear plot
        self.clear_plots()

        # Clear object editor
        #self.setup_component_editor()

        # Clear data
        self.stuff = {}

        # Clear list
        #self.tree_select.unselect_all()
        self.build_list()

        # Clear project filename
        self.project_filename = None

        # Re-fresh project options
        self.on_options_app2project(None)

    def on_filequit(self, param):
        """
        Callback for menu item File->Quit. Closes the application.

        :param param: Whatever is passed by the event. Ignore.
        :return: None
        """
        print "quit from menu"
        self.window.destroy()
        Gtk.main_quit()

    def on_closewindow(self, param):
        """
        Callback for closing the main window.

        :param param: Whatever is passed by the event. Ignore.
        :return: None
        """
        print "quit from X"
        self.window.destroy()
        Gtk.main_quit()

    def file_chooser_action(self, on_success):
        """
        Opens the file chooser and runs on_success on a separate thread
        upon completion of valid file choice.

        :param on_success: A function to run upon completion of a valid file
            selection. Takes 2 parameters: The app instance and the filename.
            Note that it is run on a separate thread, therefore it must take the
            appropriate precautions  when accessing shared resources.
        :type on_success: func
        :return: None
        """
        dialog = Gtk.FileChooserDialog("Please choose a file", self.window,
                                       Gtk.FileChooserAction.OPEN,
                                       (Gtk.STOCK_CANCEL, Gtk.ResponseType.CANCEL,
                                        Gtk.STOCK_OPEN, Gtk.ResponseType.OK))
        response = dialog.run()
        if response == Gtk.ResponseType.OK:
            filename = dialog.get_filename()
            dialog.destroy()
            t = threading.Thread(target=on_success, args=(self, filename))
            t.daemon = True
            t.start()
            #on_success(self, filename)
        elif response == Gtk.ResponseType.CANCEL:
            print("Cancel clicked")
            dialog.destroy()

    def file_chooser_save_action(self, on_success):
        """
        Opens the file chooser and runs on_success upon completion of valid file choice.

        :param on_success: A function to run upon selection of a filename. Takes 2
            parameters: The instance of the application (App) and the chosen filename. This
            gets run immediately in the same thread.
        :return: None
        """
        dialog = Gtk.FileChooserDialog("Save file", self.window,
                                       Gtk.FileChooserAction.SAVE,
                                       (Gtk.STOCK_CANCEL, Gtk.ResponseType.CANCEL,
                                        Gtk.STOCK_SAVE, Gtk.ResponseType.OK))
        dialog.set_current_name("Untitled")
        response = dialog.run()
        if response == Gtk.ResponseType.OK:
            filename = dialog.get_filename()
            dialog.destroy()
            on_success(self, filename)
        elif response == Gtk.ResponseType.CANCEL:
            print("Cancel clicked")
            dialog.destroy()

    def on_fileopengerber(self, param):
        """
        Callback for menu item File->Open Gerber. Defines a function that is then passed
        to ``self.file_chooser_action()``. It requests the creation of a FlatCAMGerber object
        and updates the progress bar throughout the process.

        :param param: Ignore
        :return: None
        """
        # IMPORTANT: on_success will run on a separate thread. Use
        # GLib.idle_add(function, **kwargs) to launch actions that will
        # updata the GUI.
        def on_success(app_obj, filename):
            assert isinstance(app_obj, App)
            GLib.idle_add(lambda: app_obj.set_progress_bar(0.1, "Opening Gerber ..."))

            def obj_init(gerber_obj, app_obj):
                GLib.idle_add(lambda: app_obj.set_progress_bar(0.2, "Parsing ..."))
                gerber_obj.parse_file(filename)
                GLib.idle_add(lambda: app_obj.set_progress_bar(0.6, "Plotting ..."))

            name = filename.split('/')[-1].split('\\')[-1]
            app_obj.new_object("gerber", name, obj_init)

            GLib.idle_add(lambda: app_obj.set_progress_bar(1.0, "Done!"))
            GLib.timeout_add_seconds(1, lambda: app_obj.set_progress_bar(0.0, ""))

        # on_success gets run on a separate thread
        self.file_chooser_action(on_success)

    def on_fileopenexcellon(self, param):
        """
        Callback for menu item File->Open Excellon. Defines a function that is then passed
        to ``self.file_chooser_action()``. It requests the creation of a FlatCAMExcellon object
        and updates the progress bar throughout the process.

        :param param: Ignore
        :return: None
        """
        # IMPORTANT: on_success will run on a separate thread. Use
        # GLib.idle_add(function, **kwargs) to launch actions that will
        # updata the GUI.
        def on_success(app_obj, filename):
            assert isinstance(app_obj, App)
            GLib.idle_add(lambda: app_obj.set_progress_bar(0.1, "Opening Excellon ..."))

            def obj_init(excellon_obj, app_obj):
                GLib.idle_add(lambda: app_obj.set_progress_bar(0.2, "Parsing ..."))
                excellon_obj.parse_file(filename)
                GLib.idle_add(lambda: app_obj.set_progress_bar(0.6, "Plotting ..."))

            name = filename.split('/')[-1].split('\\')[-1]
            app_obj.new_object("excellon", name, obj_init)

            GLib.idle_add(lambda: app_obj.set_progress_bar(1.0, "Done!"))
            GLib.timeout_add_seconds(1, lambda: app_obj.set_progress_bar(0.0, ""))

        # on_success gets run on a separate thread
        self.file_chooser_action(on_success)

    def on_fileopengcode(self, param):
        """
        Callback for menu item File->Open G-Code. Defines a function that is then passed
        to ``self.file_chooser_action()``. It requests the creation of a FlatCAMCNCjob object
        and updates the progress bar throughout the process.

        :param param: Ignore
        :return: None
        """
        # IMPORTANT: on_success will run on a separate thread. Use
        # GLib.idle_add(function, **kwargs) to launch actions that will
        # updata the GUI.
        def on_success(app_obj, filename):
            assert isinstance(app_obj, App)

            def obj_init(job_obj, app_obj):
                assert isinstance(app_obj, App)
                GLib.idle_add(lambda: app_obj.set_progress_bar(0.1, "Opening G-Code ..."))

                f = open(filename)
                gcode = f.read()
                f.close()

                job_obj.gcode = gcode

                GLib.idle_add(lambda: app_obj.set_progress_bar(0.2, "Parsing ..."))
                job_obj.gcode_parse()

                GLib.idle_add(lambda: app_obj.set_progress_bar(0.6, "Creating geometry ..."))
                job_obj.create_geometry()

                GLib.idle_add(lambda: app_obj.set_progress_bar(0.6, "Plotting ..."))

            name = filename.split('/')[-1].split('\\')[-1]
            app_obj.new_object("cncjob", name, obj_init)

            GLib.idle_add(lambda: app_obj.set_progress_bar(1.0, "Done!"))
            GLib.timeout_add_seconds(1, lambda: app_obj.set_progress_bar(0.0, ""))

        # on_success gets run on a separate thread
        self.file_chooser_action(on_success)

    def on_mouse_move_over_plot(self, event):
        """
        Callback for the mouse motion event over the plot. This event is generated
        by the Matplotlib backend and has been registered in ``self.__init__()``.
        For details, see: http://matplotlib.org/users/event_handling.html

        :param event: Contains information about the event.
        :return: None
        """
        try:  # May fail in case mouse not within axes
            self.position_label.set_label("X: %.4f   Y: %.4f" % (
                event.xdata, event.ydata))
            self.mouse = [event.xdata, event.ydata]
        except:
            self.position_label.set_label("")
            self.mouse = None

    def on_click_over_plot(self, event):
        """
        Callback for the mouse click event over the plot. This event is generated
        by the Matplotlib backend and has been registered in ``self.__init__()``.
        For details, see: http://matplotlib.org/users/event_handling.html

        :param event: Contains information about the event, like which button
            was clicked, the pixel coordinates and the axes coordinates.
        :return: None
        """
        # For key presses
        self.canvas.grab_focus()

        try:
            print 'button=%d, x=%d, y=%d, xdata=%f, ydata=%f' % (
                event.button, event.x, event.y, event.xdata, event.ydata)

            for subscriber in self.plot_click_subscribers:
                self.plot_click_subscribers[subscriber](event)
        except Exception, e:
            print "Outside plot!"

    def on_zoom_in(self, event):
        """
        Callback for zoom-in request. This can be either from the corresponding
        toolbar button or the '3' key when the canvas is focused. Calls ``self.zoom()``.

        :param event: Ignored.
        :return: None
        """
        self.zoom(1.5)
        return

    def on_zoom_out(self, event):
        """
        Callback for zoom-out request. This can be either from the corresponding
        toolbar button or the '2' key when the canvas is focused. Calls ``self.zoom()``.

        :param event: Ignored.
        :return: None
        """
        self.zoom(1 / 1.5)

    def on_zoom_fit(self, event):
        """
        Callback for zoom-out request. This can be either from the corresponding
        toolbar button or the '1' key when the canvas is focused. Calls ``self.adjust_axes()``
        with axes limits from the geometry bounds of all objects.

        :param event: Ignored.
        :return: None
        """
        xmin, ymin, xmax, ymax = get_bounds(self.stuff)
        width = xmax - xmin
        height = ymax - ymin
        xmin -= 0.05 * width
        xmax += 0.05 * width
        ymin -= 0.05 * height
        ymax += 0.05 * height
        self.adjust_axes(xmin, ymin, xmax, ymax)

    # def on_scroll_over_plot(self, event):
    #     print "Scroll"
    #     center = [event.xdata, event.ydata]
    #     if sign(event.step):
    #         self.zoom(1.5, center=center)
    #     else:
    #         self.zoom(1/1.5, center=center)
    #
    # def on_window_scroll(self, event):
    #     print "Scroll"

    def on_key_over_plot(self, event):
        """
        Callback for the key pressed event when the canvas is focused. Keyboard
        shortcuts are handled here. So far, these are the shortcuts:

        ==========  ============================================
        Key         Action
        ==========  ============================================
        '1'         Zoom-fit. Fits the axes limits to the data.
        '2'         Zoom-out.
        '3'         Zoom-in.
        ==========  ============================================

        :param event: Ignored.
        :return: None
        """
        print 'you pressed', event.key, event.xdata, event.ydata

        if event.key == '1':  # 1
            self.on_zoom_fit(None)
            return

        if event.key == '2':  # 2
            self.zoom(1 / 1.5, self.mouse)
            return

        if event.key == '3':  # 3
            self.zoom(1.5, self.mouse)
            return


app = App()
Gtk.main()