Lines 82 and 83 draw a dotted line at the top and halfway down the Y-axis. This simply makes the graph easier to read.
第82和83行在y轴的顶端和中间各划一条水平虚线，这样做只是为了让查看图时更方便。
Drawing program, so that draw lines, ellipses, polygons and other geometric elements, the results can be saved and can be read out.
画图程序，让画出直线，椭圆，多边形等几何元素，结果可以保存并可读出。
Drawing program, so that draw lines, ellipses, polygons and other geometric elements, the results can be saved and can be read out.
画图程序，让画出直线，椭圆，多边形等几何元素，结果可以保存并可读出。
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