設置3點，base點為固定，b點延base,b點方向伸縮，a點延著由3點定義的封閉曲線移動。
setting tree points ,the base point is fixed,and point B move back and forth along the direction of bace-B, point A move along the closed polyline which is define by three points.
當base-a線中點碰到b點，base-a線折成b-a線
if the mid point of line base-A come across point B,line base-A would change into line B-A.
當b-a線碰到base-b線中點，base-b線折為base-a線。
已此為一循環
if line B-A come across the mid point of line base-B,line base-B would change into line base-A.
it become a circulation.
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