椭圆

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1. cDbObjectId FymEllipse::Add(const AcGePoint3d& ptCenter, const AcGeVector3d& vecNormal, const AcGeVector3d& majorAxis, double ratio)
2. {//缺省的两个参数为椭圆起始弧度与终止弧度,ratio为大半径与小半径比
3.         AcDbEllipse* pEllipse = new AcDbEllipse(ptCenter, vecNormal, majorAxis, ratio);
4.         return FymDatabase::PostToModelSpace(pEllipse);
5. }
7. AcDbObjectId FymEllipse::Add(const AcGePoint2d& pt1, const AcGePoint2d& pt2) {
9.         AcGePoint3d ptCenter;
10.         ptCenter = FymGeometry::GetMiddlePt(FymConverUtil::ToPoint3d(pt1), FymConverUtil::ToPoint3d(pt2));
11.         AcGeVector3d vecNormal(0, 0, 1);
12.         AcGeVector3d majorAxis(fabs(pt1.x - pt2.x) / 2, 0, 0);
13.         double ratio = fabs((pt1.y - pt2.y) / (pt1.x - pt2.x));
14.         return Add(ptCenter, vecNormal, majorAxis, ratio);
15. }
17. AcDbObjectId FymEllipse::Add(const AcGePoint2d& pt1, const AcGePoint2d& pt2, const AcGePoint2d& pt3)
18. {
19.         AcGePoint3d ptCenter;
20.         ptCenter = FymGeometry::GetMiddlePt(FymConverUtil::ToPoint3d(pt1), FymConverUtil::ToPoint3d(pt2));
21.         AcGeVector3d vecNormal(0, 0, 1);
22.         double ellipseAsq = pow(pt1.x - ptCenter.x, 2) + pow(pt1.y - ptCenter.y, 2);
23.         double ellipseBsq = pow(pt3.x - ptCenter.x, 2) + pow(pt3.y - ptCenter.y, 2);
25.         AcGeVector3d majorAxis;
26.         double ratio;
27.         if (ellipseAsq > ellipseBsq)
28.         {
29.                 majorAxis = AcGeVector3d((ptCenter.x - pt1.x), (ptCenter.y - pt1.y), 0.0);
30.                 ratio = sqrt(ellipseBsq/ellipseAsq);
31.         }
32.         else
33.         {
34.                 majorAxis = AcGeVector3d((ptCenter.x - pt3.x), (ptCenter.y - pt3.y), 0.0);
35.                 ratio = sqrt(ellipseAsq/ellipseBsq);
36.         }
37.         return Add(ptCenter, vecNormal, majorAxis, ratio);
38. }

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