def __update_grid_surface(self, width, height, color = gtk.gdk.color_parse('#C0C0C0')):
self._cached_grid_surface = cairo.ImageSurface(cairo.FORMAT_ARGB32, width, height)
ctx = cairo.Context(self._cached_grid_surface)
space = self._grid_size[self._grid_type]
if space < 1: return
x, y = 0,0
position = x + space
end = x + width
ctx.save()
set_context_color(ctx, color)
ctx.set_line_width(1)
position = x + space
end = x + width
while position < end:
ctx.move_to(position, y)
ctx.line_to(position, y + height)
position += space
position = y + space
end = y + height
while position < end:
ctx.move_to(x, position )
ctx.line_to(x + width, position)
position += space
ctx.stroke()
ctx.restore()
def do_expose_event(self, event):
x , y, width, height = event.area
dimention = min(width,height)
y += (height /2) - (dimention /2)
width, height = dimention, dimention
ctx = event.window.cairo_create()
ctx.translate(x, y)
ctx.set_antialias(cairo.ANTIALIAS_SUBPIXEL)
ctx.rectangle(0, 0, width, height)
ctx.clip_preserve()
set_context_color(ctx, self._color)
ctx.fill_preserve()
ctx.set_line_width(1.0)
set_context_color(ctx, gtk.gdk.color_parse('#000000'))
ctx.stroke()
def draw(self, ctx, x=0, y=0):
points = self._points
if not points: return
ctx.save()
ctx.set_operator(self._operator)
ctx.translate(x,y)
x, y, width, height = self._path_rectangle
ctx.rectangle(x,y, width, height)
ctx.clip()
ctx.set_antialias(cairo.ANTIALIAS_SUBPIXEL)
ctx.set_line_cap(cairo.LINE_CAP_ROUND)
ctx.set_line_join(cairo.LINE_JOIN_ROUND)
set_context_color(ctx, self._color)
ctx.set_line_width(self._stroke_size)
ctx.move_to(points[0].x, points[0].y)
for point in points[1:len(points)]:
ctx.line_to(point.x, point.y)
if len(points) == 1:
ctx.line_to(points[0].x, points[0].y)
ctx.stroke()
ctx.restore()
def __draw_canvas(self, ctx, x,y, width, height, color = gtk.gdk.color_parse('#ffffff')):
ctx.save()
set_context_color(ctx, color)
ctx.set_operator(cairo.OPERATOR_DEST_OVER)
ctx.paint()
ctx.restore()
