数据结构概念树图划分.ppt

四边形类及其对象 属性 aPoint1 aPoint2 aPoint3 aPoint4 服务 Draw( ) move?x, ?y) contains(aPoint) 属性值 属性值 quadrilateral1 quadrilateral2 (35, 10) (50, 10) (35, 25) (50, 25) (45, 65) (50, 45) (65, 66) (60, 70) Draw(