1.圆的绘制 输入圆心的位置与半径的大小，即可绘制圆。 2.多边形的填充 根据扫描线求交法，排序法，气泡法等，对一个多边形进行填充-1. Circle drawing enter the center location and radius of the size, you can draw round. 2. Polygon scan line in accordance with the filling intersection method, ordering method, bubb