简单线性梯度很容易：画一个四边形多边形的两个顶点设置为一个颜色和它的两个顶点设置为第二个颜色。
A simple linear gradient is easy: draw a quadrilateral polygon with two of its vertices set to one color and two of its vertices set to a second color.
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.
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.
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