风车，由外部大圆与内部3片风车叶组成，风车叶有3种颜色，风车不停逆时针旋转-Windmill, by external and internal circle composed of three leaves windmill, windmill leaves in 3 colors, counterclockwise rotation of the windmill kept

运用鼠标来确定点的位置，根据点的前后顺序将点连接画出矩形-Use the mouse to determine the location of the point, according to the order in which the points before and after the point of connection Draw