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);
