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# TheDrawingAreaEventBox.py Manages the drawing component
#
#This file is part of LearningWriting.
#
#LearningWriting is free software: you can redistribute it and/or modify
#it under the terms of the GNU General Public License as published by
#the Free Software Foundation, either version 3 of the License, or
#(at your option) any later version.
#
#LearningWriting is distributed in the hope that it will be useful,
#but WITHOUT ANY WARRANTY; without even the implied warranty of
#MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
#GNU General Public License for more details.
#
#You should have received a copy of the GNU General Public License
#along with LearningWriting. If not, see <http://www.gnu.org/licenses/>.
import pygtk
pygtk.require('2.0')
import gtk
import cairo
import gobject
class TheDrawingAreaEventBox(gtk.EventBox):
'''
A gtk.EventBox wrapping the DrawingArea (or canvas) of the application
We use an EventBox in order to pass events to the contained DrawingArea
'''
__DARK_GREEN = (27.0/255.0, 103.0/255.0,46.0/255.0)
__WHITE = (1.0, 1.0, 1.0)
def __init__(self):
'''
Simple constructor without argument
'''
gtk.EventBox.__init__(self)
self.__setFields()
self.__setConnections()
def __setFields(self):
'''
Gives values to fields
'''
self.__drawingArea = gtk.DrawingArea()
self.add(self.__drawingArea)
self.__figures = []
self.__lineThickness = 5
# number of steps (for the figures overall) currently drawn
# only used in reading mode (which is the starting mode)
self.__drawn_steps = -1
# __overall_maximum_steps stores the steps of all the figures
# only used in reading mode (which is the starting mode)
self.__overall_maximum_steps = -1
# __current_maximum_steps stores the maximum steps the updater thread
# is allowing to draw. In each cycle of the updater thread, this value
# is incremented, giving this impression of a tape reading
# only used in reading mode (which is the starting mode)
self.__current_maximum_steps = -1
# the updater delay in milliseconds
# => at which intervals, in reading mode,
# the redraws should be done
self.__updater_delay_milliseconds = -1
self.__mousePressed = False
self.__readingMode = False
def __setConnections(self):
'''
Define the events connections
'''
self.__drawingArea.connect("expose-event", self.__paintSurface)
self.connect("motion-notify-event", self.__manageMouseMovedEvent)
self.connect("button-press-event", self.__manageButtonPressedEvent)
self.connect("button-release-event", self.__manageButtonReleasedEvent)
def setRecordingMode(self, line_thickness):
'''
Switch drawing area management to recording mode
=> setRecordingMode(line_thickness)
where line_thickness is an integer
'''
self.__readingMode = False
self.__figures = []
self.__drawingArea.queue_draw()
self.__startNewFigure()
self.__setLineThickness(line_thickness)
def setReadingMode(self, intervals_between_steps_milliseconds):
'''
Switch drawing area management to reading mode
=> intervals_between_steps argument is an integer saying delays
in millisecond between steps
=> setReadingMode(intervals_between_steps_milliseconds)
=> intervals_between_steps_milliseconds : integer
'''
self.__updater_delay_milliseconds = intervals_between_steps_milliseconds
self.__drawn_steps = 0
self.__current_maximum_steps = 0
self.__computeOverallMaximumSteps()
self.__drawingArea.queue_draw()
self.__readingMode = True
self.__regularlyUpdatePaintForReadingMode()
def __setLineThickness(self, line_thickness):
'''
Sets lines thickness. Only integers greater than 0 will be taken
in consideration.
=> __setLineThickness(line_thickness)
where line_thickness is an integer
'''
if isinstance(line_thickness, int) and line_thickness > 0:
self.__lineThickness = line_thickness
def __paintSurface(self, widget, event):
'''
Paint the whole drawing area
=> __paintSurface(widget, event)
'''
cairoContext = self.__drawingArea.window.cairo_create()
self.__drawBackground(cairoContext)
self.__drawFigures(cairoContext)
return True
def __drawBackground(self, cairoContext):
'''
Paints the background
=> __drawBackground(cairoContext)
where cairoContext is a cairo context of the DrawingArea
'''
cairoContext.set_source_rgb(*TheDrawingAreaEventBox.__DARK_GREEN)
cairoContext.rectangle( 0,0, *(self.window.get_size()) )
cairoContext.fill()
def __drawFigures(self, cairoContext):
'''
Draws the figures
=> __drawFigures(cairoContext)
where cairoContext is a cairo context of the DrawingArea
'''
cairoContext.set_source_rgb(*TheDrawingAreaEventBox.__WHITE)
cairoContext.set_line_width(self.__lineThickness)
cairoContext.set_line_join(cairo.LINE_JOIN_ROUND)
cairoContext.set_line_cap(cairo.LINE_CAP_ROUND)
if self.__readingMode:
self.__drawn_steps = 0
for current_figure in self.__figures:
if len(current_figure) > 0 :
startPoint = current_figure[0]
cairoContext.move_to(*startPoint)
if self.__readingMode:
self.__drawn_steps += 1
for pointIndex in range(1, len(current_figure)):
if self.__readingMode and self.__drawn_steps >= self.__current_maximum_steps :
cairoContext.stroke()
return
endPoint = current_figure[pointIndex]
cairoContext.line_to(*endPoint)
startPoint = endPoint
if self.__readingMode :
self.__drawn_steps += 1
cairoContext.stroke()
def __startNewFigure(self):
'''
Starts a new figure
'''
self.__figures += [[]]
def __addPointToCurrentFigure(self, pointTuple):
'''
Adds a point to the current figure
==> __addPointToCurrentFigure(pointTuple)
where pointTuple is a tuple of the point coordinates
'''
self.__figures[len(self.__figures)-1] += [pointTuple]
def __computeOverallMaximumSteps(self):
'''
Computes the number of steps of all the Figures to draw
'''
self.__overall_maximum_steps = 0
for current_figure in self.__figures :
self.__overall_maximum_steps += len(current_figure)
def __manageMouseMovedEvent(self, widget, event):
'''
Manage mouse move event
=> __manageMouseMovedEvent(widget, event)
'''
if self.__mousePressed:
self.__addPointToCurrentFigure((event.x, event.y))
self.__drawingArea.queue_draw() # repaint the drawing area
return True # we don't need further handling for this event
def __manageButtonPressedEvent(self, widget, event):
'''
Manage button pressed event
=> __manageButtonPressedEvent(widget, event)
'''
self.__startNewFigure()
self.__mousePressed = True
return True # we don't need further handling for this event
def __manageButtonReleasedEvent(self, widget, event):
'''
Manage button released event
=> __manageButtonReleasedEvent(widget, event)
'''
self.__mousePressed = False
return True # we don't need further handling for this event
def __regularlyUpdatePaintForReadingMode(self):
'''
Increases the current maximum drawn steps and repaint all, at
regular delays. (For reading mode)
=> __regularlyUpdatePaintForReadingMode(regular_delay_milliseconds)
regular_delay_milliseconds : integer
'''
if self.__readingMode:
self.__current_maximum_steps += 1
self.__drawingArea.queue_draw()
if self.__current_maximum_steps < self.__overall_maximum_steps :
gobject.timeout_add(
self.__updater_delay_milliseconds,
self.__regularlyUpdatePaintForReadingMode
)
def saveFiguresInTextFile(self, text_file):
'''
Save the points in a file opened with function 'open' in write mode.
Be careful !!! Do not pass a file opened in binary mode !!!
And also, remember to close the file after this method call !!!
=> saveFiguresInTextFile(text_file)
'''
for current_figure in self.__figures :
if current_figure:
text_file.write("New\n")
for point_coordinates in current_figure:
if point_coordinates:
text_file.write("%d#%d " % point_coordinates)
text_file.write("\n")
def readFiguresFromTextFile(self, text_file):
'''
Read the points from a file opened with function 'open' in read mode.
Be careful !!! Do not pass a filed opened in a binary mode !!!
And also, remember to close the file after this method call !!!
=> readFiguresFromTextFile(text_file)
'''
new_figures_array = []
for current_line in text_file.readlines():
if current_line != "New\n" :
new_figure = []
for current_point_string in current_line.split(' '):
if current_point_string:
current_point_string_parts = current_point_string.split('#')
new_figure.append((int(current_point_string_parts[0]),
int(current_point_string_parts[1])))
if new_figure:
new_figures_array.append(new_figure)
self.__figures = new_figures_array
self.__drawingArea.queue_draw()
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