Python cairo 模块，OPERATOR_SOURCE 实例源码

def draw_line(self, ctx, x, y, width, height):
        ctx.move_to(x, y)
        ctx.rel_line_to(width, height)
        ctx.close_path()
        ctx.set_operator(cairo.OPERATOR_SOURCE)
        ctx.set_line_width(1.0)
        ctx.set_source_rgb(0, 0, 0)
        ctx.stroke()

def transparent_pix(self):

    op = self.ctx.get_operator()
    self.ctx.set_operator(OPERATOR_SOURCE)
    self.ctx.set_source_rgba(*[1, 1, 1, 0.95])
    self.dot(1-self.pix, 1.0-self.pix)
    self.ctx.set_operator(op)

def area_draw(wid, cr):
        """
        area_draw: Çizim Alan?
        Çizilen pencere alan?nda görsel de?i?iklikler yapmam?z? sa?lar. Pencere'nin
        Arkaplan rengini siyah, görünürlü?ünü'de %90 opak yaparak %10 transparan 
        Olmas?n? sa?lad?k ve ard?ndan cizimin yap?lmas?n? istedik.
        """
        cr.set_source_rgba(0, 0, 0, 0.9)
        cr.set_operator(cairo.OPERATOR_SOURCE)
        cr.paint()
        cr.set_operator(cairo.OPERATOR_OVER)

def transparent_pix(self):

    op = self.ctx.get_operator()
    self.ctx.set_operator(OPERATOR_SOURCE)
    self.ctx.set_source_rgba(*[1, 1, 1, 0.95])
    self.dot(1-self.pix, 1.0-self.pix)
    self.ctx.set_operator(op)

def area_draw(self, widget, cr):  # pragma: no cover
        cr.set_source_rgba(.0, .0, .0, 0.0)
        cr.set_operator(cairo.OPERATOR_SOURCE)
        cr.paint()
        cr.set_operator(cairo.OPERATOR_OVER)
        cr.set_source_rgb(0.9, 0.1, 0.1)
        cr.set_line_width(6)
        cr.rectangle(0, 0, self.get_size()[0], self.get_size()[1])
        cr.stroke()