def make_rectangle(self, rect_id, colored='g'):
self.rect = Rectangle(
(self.image.shape[0] / 2 - self.image.shape[1] / 8,
self.image.shape[0] / 2 + self.image.shape[1] / 8),
self.image.shape[0] / 4,
self.image.shape[1] / 4,
color=colored,
linewidth=3,
fill=False)
rect_artist = self.axis.add_artist(self.rect)
rect_artist.set_gid(rect_id)
self.axis.figure.canvas.draw()
return Rectangle.get_gid(self.rect)
