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McDbArc::computeArc 方法

由三点计算圆弧

C++
Mcad::ErrorStatus computeArc(McGePoint3d startPt, McGePoint3d midPt, McGePoint3d endPt);
参数 
说明 
McGePoint3d startPt 
圆弧的开始点 
McGePoint3d midPt 
圆弧上的一点 
McGePoint3d endPt 
圆弧的结束点 

成功返回Mcad::eok

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