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例2-4
- 绘制左上角点为P0(100,100),右下角点为P1(600,300)的矩形。矩形边界线为1像素宽的蓝线,矩形内部填充为绿色(Draw the left upper corner is P0 (100100), the lower right corner is P1 (600300) rectangle. The rectangle boundary line is 1 pixels wide blue line, and the inner rectangle is filled with