As you see in Figure 4, The solution to the point-in-polygon problem is to draw a horizontal line starting at the point in question.
如图4中所示，点包容问题的解决方案是绘制一条从所关注的点开始的水平线。
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.
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。
Requirements can draw a straight line, arc, elliptical arc, polygon, to custom colors.
实现一个画图程序。要求能够画直线，圆弧，椭圆弧，多边形，能够自定义颜色。
Requirements can draw a straight line, arc, elliptical arc, polygon, to custom colors.
实现一个画图程序。要求能够画直线，圆弧，椭圆弧，多边形，能够自定义颜色。
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