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二维的画图类,可以进行点,线,三角形,矩形,椭圆,圆等形状的画图,并可进行缩放,是一个完整的类,直接调入自己的程序里面使用就可以的。-two-dimensional drawing class, for point, line, triangular, rectangular, oval, round shapes such as drawing, to carry out the zoom, is a complete category, transferred directly inside their use on the can.