sugar-toolkit-gtk3/sugar/chat/sketchpad/SketchPad.py

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import pygtk
pygtk.require('2.0')
import gtk
from Sketch import Sketch
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from SVGdraw import drawing
from SVGdraw import svg
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class SketchPad(gtk.DrawingArea):
def __init__(self):
gtk.DrawingArea.__init__(self)
self._active_sketch = None
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self._rgb = (0.0, 0.0, 0.0)
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self._sketches = []
self.add_events(gtk.gdk.BUTTON_PRESS_MASK |
gtk.gdk.BUTTON1_MOTION_MASK)
self.connect("button-press-event", self.__button_press_cb)
self.connect("button-release-event", self.__button_release_cb)
self.connect("motion-notify-event", self.__motion_notify_cb)
self.connect('expose_event', self.expose)
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def clear(self):
self._sketches = []
self.window.invalidate_rect(None, False)
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def expose(self, widget, event):
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"""Draw the background of the sketchpad."""
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rect = self.get_allocation()
ctx = widget.window.cairo_create()
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ctx.set_source_rgb(0.6, 1, 0.4)
ctx.rectangle(0, 0, rect.width, rect.height)
ctx.fill_preserve()
ctx.set_source_rgb(0, 0.3, 0.2)
ctx.stroke()
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for sketch in self._sketches:
sketch.draw(ctx)
return False
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def set_color(self, color):
"""Sets the current drawing color of the sketchpad.
color agument should be 3-item tuple of rgb values between 0 and 1."""
self._rgb = color
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def add_sketch(self, sketch):
self._sketches.append(sketch)
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def add_point(self, event):
if self._active_sketch:
self._active_sketch.add_point(event.x, event.y)
self.window.invalidate_rect(None, False)
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def __button_press_cb(self, widget, event):
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self._active_sketch = Sketch(self._rgb)
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self.add_sketch(self._active_sketch)
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self.add_point(event)
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def __button_release_cb(self, widget, event):
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self.add_point(event)
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self._active_sketch = None
def __motion_notify_cb(self, widget, event):
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self.add_point(event)
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def to_svg(self):
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"""Return a string containing an SVG representation of this sketch."""
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d = drawing()
s = svg()
for sketch in self._sketches:
s.addElement(sketch.draw_to_svg())
d.setSVG(s)
return d.toXml()
def test_quit(w, skpad):
print skpad.to_svg()
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gtk.main_quit()
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if __name__ == "__main__":
window = gtk.Window()
window.set_default_size(400, 300)
window.connect("destroy", lambda w: gtk.main_quit())
sketchpad = SketchPad()
window.add(sketchpad)
sketchpad.show()
window.show()
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window.connect("destroy", test_quit, sketchpad)
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gtk.main()