思路是设计一个矩形辅助窗口，并利用“四边形对角线交换”技术来获得简单多边形的三角剖分。
The TSP problem is solved by designing an auxiliary square window and utilizing a "quadrilateral diagonal exchanging" technique.
平行四边形的位置确定图像在屏幕上的位置，矩形的大小以及平行四边形的大小和形状确定所绘制图像的缩放和剪切。
The position of the parallelogram locates the image on the screen, and the size of the rectangle and the size and shape of the parallelogram determines the scaling and shearing of the drawn image.
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