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import gtk, sys, cairo
from math import pi
pngfile = 'vortex.me.png'
class HandlerClass:
def on_expose(self,widget,data=None):
print "on_expose"
cr = widget.window.cairo_create()
# Sets the operator to clear which deletes everything below
# where an object is drawn
cr.set_operator(cairo.OPERATOR_CLEAR)
# Makes the mask fill the entire window
cr.rectangle(0.0, 0.0, *widget.get_size())
# Deletes everything in the window (since the compositing
# operator is clear and mask fills the entire window
cr.fill()
# Set the compositing operator back to the default
cr.set_operator(cairo.OPERATOR_OVER)
if self.scale:
x, y, w, h = widget.allocation
cr.scale(1.0 *w / self.width, 1.0*h/self.height)
cr.set_source_surface(self.img, 0, 0)
cr.paint()
def __init__(self, halcomp,builder,useropts):
self.builder = builder
win = self.builder.get_object("window1")
#win.set_decorated(False)
self.img = cairo.ImageSurface.create_from_png(pngfile)
self.width = self.img.get_width()
self.height = self.img.get_height()
# Makes the window paintable, so we can draw directly on it
win.set_app_paintable(True)
win.set_size_request(self.width, self.height)
# This sets the windows colormap, so it supports transparency.
# This will only work if the wm support alpha channel
screen = win.get_screen()
rgba = screen.get_rgba_colormap()
win.set_colormap(rgba)
# scaling the bitmap is possible by turning this on
# however the fixed widget does NOT do proportional scaling
self.scale = 1
def get_handlers(halcomp,builder,useropts):
return [HandlerClass(halcomp,builder,useropts)]
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