i'm having some trouble trying to move a custom widget(in this case an ellipse) in the Drawing Area. It seems to get the required mouse click and motion signals but does not move.
The code :
import gtk
import gtk.gdk
import math
class Ellipse(gtk.DrawingArea):
def __init__(self):
gtk.DrawingArea.__init__(self)
self.add_events(gtk.gdk.BUTTON_PRESS_MASK |
gtk.gdk.BUTTON1_MOTION_MASK)
self.connect("expose_event", self.expose)
self.connect("button_press_event", self.pressing)
self.connect("motion_notify_event", self.moving)
self.desp = 0
def pressing(self, widget, event):
print "Button Press"
self.pressing_x = event.x
def moving(self, widget, event):
print "Move"
if (self.pressing_x - event.x) > 1:
self.desp = self.desp + 0.1
else:
self.desp = self.desp - 0.1
self.pressing_x = event.x
self.draw(self.context)
self.queue_draw()
def expose(self, widget, event):
self.context = widget.window.cairo_create()
self.context.rectangle(event.area.x, event.area.y,
event.area.width, event.area.height)
self.context.clip()
self.draw(self.context)
return False
def draw(self, context):
rect = self.get_allocation()
x = rect.width / 2
y = rect.height / 2
ex = x
ey = y
ew = rect.width / 4.0
eh = rect.height / 12.0
context.save()
context.translate (ex, ey)
context.scale (ew / 2.0 , eh / 2.0)
context.arc (0, 0, 1., 0 + self.desp, (2 * math.pi) + self.desp)
print self.desp
context.set_source_rgb(0, 0, 0)
context.fill_preserve()
context.set_source_rgb(1, 1, 1)
context.stroke()
context.restore ()
def main():
window = gtk.Window()
clock = Ellipse()
window.add(clock)
window.connect("destroy", gtk.main_quit)
window.show_all()
gtk.main()
if __name__ == "__main__":
main()
i tried it out looking at the code :
http://www.oluyede.org/blog/writing-a-widget-using-cairo-and-pygtk-28/
and
http://pupeno.com/blog/making-a-widget-with-pygtk
and
http://www.pygtk.org/articles/cairo-pygtk-widget-signals-es/cairo-pygtk-widget-signals.html
(i don't speak Spanish so i didn't fully understand the inlilne comments and the documentation)
thanks in advance!
regards,
- vihan
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