绘制管道图
void pipe_draw(int bs);
//bs:pipe_start创建的存储句柄示例
bs=pipe_start(100,150,5,21);
pipe_set(bs,0,"BU2R2D3L2E0L1",1,2);
pipe_draw(bs);说明：
- 连续调用会产生管道流动的效果，一般需要在控件的ontimer事件中调用本函数，用于产生管道流动的效果；
void pipe_draw(int bs);
//bs:pipe_start创建的存储句柄bs=pipe_start(100,150,5,21);
pipe_set(bs,0,"BU2R2D3L2E0L1",1,2);
pipe_draw(bs);