CAD返回曲线组成的闭合区域面积（com接口c#语言）
IMxDrawCurve::GetArea
返回曲线组成的闭合区域面积，具体详细如下：
| 参数 | 说明 |
|---|---|
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[out] DOUBLE* pArea |
返回闭合区域面积 |
C#代码计算闭合区域面积：
MxDrawPolyline pl = new MxDrawPolyline();
MxDrawPoint pt1 = new MxDrawPoint();
pt1.x = 10;
pt1.y = 10;
MxDrawPoint pt2 = new MxDrawPoint();
pt2.x = 20;
pt2.y = 20;
MxDrawPoint pt3 = new MxDrawPoint();
pt3.x = 30.5;
pt3.y = 10;
pl.AddVertexAt(pt1);
pl.AddVertexAt(pt2);
pl.AddVertexAt(pt3);
pl.IsClosedStatus = true;
double dArea = 0.0;
pl.GetArea(out dArea);
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