绘制分形图: 分形树，先按某一方向画一条直线，然后在此线段上找到一系列节点，

在每一节点处向左右偏转一定角度各画一条分枝。

节点位置和节点处所画分枝的长度可参考编程要求中的分割比例

-Draw Fractal map: fractal tree initially draw a straight line in a direction, then find a series of nodes, each node on the line to the left and right deflection angle to draw a branching. Length node position and node premises of painting branches split ratio can refer to the programming requirements