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