grid.py 文件源码

def output_png(self, filename):
        surface = cairo.ImageSurface(cairo.FORMAT_ARGB32, 
                                     self.__data.get_width(), 
                                     self.__data.get_height())
        ctx = cairo.Context(self.__buffer_surface)
        self.__data.draw(ctx)
        surface.write_to_png(filename)