The DXF and DWG file formats also support arcs and circles, which you can approximate in your output formats by creating multiple small line segments approximating the circle or arc.
DXF和DWG文件格式还支持弧和圆，您可以在输出格式中通过创建多个小线段来近似模拟圆或弧。
Drawing module is divided into seven small modules: dash, line, rectangle, circle, arc, ellipse and bezier.
在图形的绘制模块中又可以分成七个小的模块：直线、虚线、圆和圆弧、椭圆及椭圆弧、样条曲线。
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