圆

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1. AcDbObjectId FymCircle::Add(const AcGePoint3d& centerPt, const AcGeVector3d& normal, double radius)
2. {
3.         AcDbCircle* pcir = new AcDbCircle(centerPt, normal, radius);
4.         return FymDatabase::PostToModelSpace(pcir);
5. }
7. AcDbObjectId FymCircle::Add(const AcGePoint3d& centerPt, double radius)
8. {
9.         AcGeVector3d vec(0, 0, 1);//默认normal
10.         return Add(centerPt, vec, radius);
11. }
13. AcDbObjectId FymCircle::Add(const AcGePoint2d& point1, const AcGePoint2d& point2)//点在圆上
14. {
15.         AcGePoint2d center = FymGeometry::GetMiddlePt(point1, point2);
16.         AcGePoint3d center3d(center.x, center.y, 0.0);
17.         double radius = center.distanceTo(point1);//中点和点1距离
18.         return Add(center3d, radius);
19. }
21. AcDbObjectId FymCircle::AddByMath(const AcGePoint2d& point1, const AcGePoint2d& point2, const AcGePoint2d& point3)
22. {
23.         double xysm = 0, xyse = 0, xy = 0;
24.         AcGePoint3d ptCenter;
25.         double radius = 0;
26.         //sqrt为求平方根函数
27.         xy = pow(point1.x, 2) + pow(point2.y, 2);
28.         xyse = xy - pow(point3.x, 2) - pow(point3.y, 2);
29.         xysm = xy - pow(point2.x, 2) - pow(point2.y, 2);
30.         xy = (point1.x - point2.x) * (point1.y - point3.y) - (point1.x - point3.x) * (point1.y - point2.y);
31.         //fabs为绝对值函数
32.         if (fabs(xy) < 0.000001)
33.         {
34.                 AfxMessageBox(采用T("输入参数无效,不能创建图形!"));
35.                 return AcDbObjectId::kNull;
36.         }
37.         ptCenter.x = (xysm * (point1.y - point3.y) - xyse * (point1.y - point2.y)) / (2 * xy);
38.         ptCenter.y = (xysm * (point1.x - point2.x) - xysm * (point1.x - point3.x)) / (2 * xy);
39.         ptCenter.z = 0.0;
40.         //sqrt为求平方根函数
41.         radius = sqrt((point1.x - ptCenter.x) * (point1.x - ptCenter.x) + (point1.y - ptCenter.y) * (point1.y - ptCenter.y));
42.         if (radius < 0.0000001)
43.         {
44.                 AfxMessageBox(采用T("半径过小!"));//在CAD界面弹出消息框
45.                 return AcDbObjectId::kNull;
46.         }
47.         return Add(ptCenter, radius);
48. }
50. AcDbObjectId FymCircle::Add(const AcGePoint2d& point1, const AcGePoint2d& point2, const AcGePoint2d& point3)
51. {
52.         AcGeCircArc2d geArc(point1, point2, point3);
53.         AcGePoint3d center(geArc.center().x, geArc.center().y, 0.0);
54.         return Add(center, geArc.radius());
55. }

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