Method construct

animations/rb.py:265–277

(self)

            self.play(FadeOut(tree))

    def construct(self):
        self.start_logo(animate=False)
        self.init_message("红黑树插入的3个case",tex=True, tex_map={"case":RED_D, "3":RED})
        # left case 
        self.show_message("节点在左边的情况",tex=True, tex_map={"左边":BLUE_D})
        self.show_colors()
        self.rand(5, 6, fadeout=True)

        # right case 1,2,3
        self.show_message("节点在右边的情况",tex=True, tex_map={"右边":BLUE_D})
        self.rand(3, 6, fadeout=False)

        self.wait()

# 4 case
class RedBlackTreeDelete(RBScene):