OCC曲线投影到面上

 1 TopoDS_Edge edge0 = BRepBuilderAPI_MakeEdge(gp_Pnt(0, 0, 0), gp_Pnt(10, 10, 10));
 2     Geometry::instance()->addShape(ShapeType::Curve, edge0);
 3 
 4     gp_Pnt pnt1(0, 10, 0);
 5     gp_Pnt pnt2(10, 10, 0);
 6     gp_Pnt pnt3(10, 0, 0);
 7     gp_Pnt pnt4(0, 0, 0);
 8     TopoDS_Edge edge1 = BRepBuilderAPI_MakeEdge(pnt1, pnt2);
 9     Geometry::instance()->addShape(ShapeType::Curve, edge1);
10     TopoDS_Edge edge2 = BRepBuilderAPI_MakeEdge(pnt2, pnt3);
11     Geometry::instance()->addShape(ShapeType::Curve, edge2);
12     TopoDS_Edge edge3 = BRepBuilderAPI_MakeEdge(pnt3, pnt4);
13     Geometry::instance()->addShape(ShapeType::Curve, edge3);
14     TopoDS_Edge edge4 = BRepBuilderAPI_MakeEdge(pnt4, pnt1);
15     Geometry::instance()->addShape(ShapeType::Curve, edge4);
16 
17     BRepBuilderAPI_MakeWire wire;
18     wire.Add(edge1);
19     wire.Add(edge2);
20     wire.Add(edge3);
21     wire.Add(edge4);
22     wire.Build();
23 
24     BRepBuilderAPI_MakeFace face(wire);
25     Geometry::instance()->addShape(ShapeType::Surface, face);
26 
27     Standard_Real first, last;
28     Handle(Geom_Curve) curve = BRep_Tool::Curve(edge0, first, last);
29     Handle(Geom_TrimmedCurve) trimmedCurve = new  Geom_TrimmedCurve(curve, first, last);
30 
31     Handle(Geom_Surface) surface = BRep_Tool::Surface(face);
32 
33     Handle(Geom_Curve) projCurve = GeomProjLib::Project(trimmedCurve, surface);
34 
35 
36 
37     /** 计算端点投影 */
38             /*@{*/
39     gp_Pnt pntFirst(0, 0, 0);
40     gp_Pnt pntLast(10, 10, 10);
41 
42     GeomAPI_ProjectPointOnSurf projFirst(pntFirst, surface);
43     GeomAPI_ProjectPointOnSurf projLast(pntLast, surface);
44 
45     if (projFirst.NbPoints() != 1 || projLast.NbPoints() != 1 || projFirst.Point(1).Distance(projLast.Point(1)) < Precision::Confusion()) {
46         return;
47     }
48     pntFirst = projFirst.Point(1);
49     pntLast = projLast.Point(1);
50 
51     Standard_Real newFirst, newLast;
52     if (
53         !GeomLib_Tool::Parameter(projCurve, pntFirst, Precision::Confusion(), newFirst) ||
54         !GeomLib_Tool::Parameter(projCurve, pntLast, Precision::Confusion(), newLast)) {
55         return;
56     }
57     /*@}*/
58 
59     BRepBuilderAPI_MakeEdge result(projCurve);
60 
61     Geometry::instance()->addShape(ShapeType::Curve, result);