opencascade(十一) 几何算法

1.1     OCGeomAPI_IntCS

(1)    功能说明：线面求交

(2)    构造函数：

public OCGeomAPI_IntCS(OCGeom_Curve C, OCGeom_Surface S)

(3)    主要方法：

public bool IsDone();//求交是否执行成功

public int NbPoints();//曲线与曲面有多少个交点

public int NbSegments();//曲线与曲面有多少个相交的线段（有代验证）

public OCgp_Pnt Point(int Index);//获取交点

public OCGeom_Curve Segment(int Index);//获取线段

 

(4)    实例

OCGeom_BSplineCurve SPL;  OCGeom_BSplineSurface BSS1;

OCGeomAPI_IntCS CS = new OCGeomAPI_IntCS(SPL, BSS1);

OCGeom_Curve segment;

if (CS.IsDone())

  {

    int NbSeg = CS.NbSegments();

   //取线段并显示

    for (int k = 1; k <= NbSeg; k++)

    {

        segment = CS.Segment(k);

        OCBRepBuilderAPI_MakeEdge MEdge1 =

new OCBRepBuilderAPI_MakeEdge(segment);

        OCAIS_Shape aCurve1 = new OCAIS_Shape(MEdge1.Edge());                   

        context.Display(aCurve1, false);

     }

     //取交点并显示

     for (int k = 1; k <= CS.NbPoints(); k++)

        {

          OCgp_Pnt aPoint = CS.Point(k);

          OCTopoDS_Vertex V1 = new OCBRepBuilderAPI_MakeVertex(aPoint).Vertex();

          OCAIS_Shape Point1 = new OCAIS_Shape(V1);

          context.Display(Point1, false);

          }

}

1.2     OCGeomAPI_IntSS

(1)    功能说明：面面求交

(2)    构造函数：

public OCGeomAPI_IntSS(OCGeom_Surface S1, OCGeom_Surface S2, double Tol)

参数：TOL，定义曲线计算的精确度，默认值为：1.0e-7

(3)    主要方法：

public bool IsDone();//是否求交成功

public OCGeom_Curve Line(int Index);//返回曲线相交的曲线

public int NbLines();//曲线求交产生多少条线

 

(4)    实例

OCGeomFill_BSplineCurves BSS,BSS1;

 

OCGeomAPI_IntSS SS = new OCGeomAPI_IntSS(BSS, BSS1, 1.0e-7);

            OCGeom_Curve segment;

            if (SS.IsDone())

            {

                int NbSeg = SS.NbLines();

                for (int k = 1; k <= NbSeg; k++)

                {

                    segment = SS.Line(k);

                    OCBRepBuilderAPI_MakeEdge MEdge1 = new OCBRepBuilderAPI_MakeEdge(segment);

                    OCAIS_Shape aCurve1 = new OCAIS_Shape(MEdge1.Edge());

                    context.Display(aCurve1, false);

                }               

            }

1.3     OCGeomAPI_ExtremaCurveCurve

(1)    功能说明：两条曲线求极值，可用于曲线的求交