360免费建站可以免费又永久吗,长沙网站开发制作,wordpress点击阅读全部,wordpress 个人资料PCurve这个概念#xff0c;字面上来理解就是参数曲线#xff08;Parametric Curve#xff09;。参数空间曲线是在参数曲面的双参数空间中的二维样条曲线。
二维曲线定义的目的只有一个#xff1a;pCurve#xff0c;参数曲线。OCC采用参数法构建几何结构#xff0c;所有的…PCurve这个概念字面上来理解就是参数曲线Parametric Curve。参数空间曲线是在参数曲面的双参数空间中的二维样条曲线。
二维曲线定义的目的只有一个pCurve参数曲线。OCC采用参数法构建几何结构所有的三维曲线面的边界都对应于二维参数曲线pCurve。二维参数曲线pCurve上的二维点对应实际曲线上的三维点。如下代码我们遍历一个Topo_Face的Edge然后求得Edge对应的pCurve。并显示Face的二维参数面。
// OpenCascade library.
#define WNT
#include TopoDS.hxx
#include TopExp.hxx
#include TopExp_Explorer.hxx
#include BRepPrimAPI_MakeSphere.hxx
#include BRepBuilderAPI_MakeWire.hxx
#include BRep_Tool.hxx
#include BRepBuilderAPI_MakeEdge2d.hxx
#pragma comment(lib, TKernel.lib)
#pragma comment(lib, TKMath.lib)
#pragma comment(lib, TKBRep.lib)
#pragma comment(lib, TKTopAlgo.lib)
#pragma comment(lib, TKPrim.lib)
int main(int argc, char* argv[])
{TopoDS_Face face BRepPrimAPI_MakeSphere(1.0);TopExp_Explorer aWireExp(face, TopAbs_WIRE);for (aWireExp; aWireExp.More(); aWireExp.Next()) {//获取每条wireBRepBuilderAPI_MakeWire wire2d;TopoDS_Wire aTempWire TopoDS::Wire(aWireExp.Current());//获取EdgeTopExp_Explorer aEdgeExp(aTempWire, TopAbs_EDGE);for (aEdgeExp; aEdgeExp.More(); aEdgeExp.Next()) {TopoDS_Edge aTempEdge TopoDS::Edge(aEdgeExp.Current());
//获取PCurveStandard_Real aPFirst, aPLast;Handle(Geom2d_Curve) aPCurve BRep_Tool::CurveOnSurface(aTempEdge, face, aPFirst, aPLast);//获取此时PCurve的端点坐标即UV值。gp_Pnt2d pStart, pEnd;aPCurve-D0(aPFirst, pStart);aPCurve-D0(aPLast, pEnd);std::cout \n;std::cout 起始点坐标[ pStart.X() , pStart.Y() ]\n;std::cout 终止点坐标[ pEnd.X() , pEnd.Y() ]\n;TopoDS_Edge aEdge2d BRepBuilderAPI_MakeEdge2d(aPCurve, aPFirst, aPLast);wire2d.Add(aEdge2d);
}}
return 0;
} 起始点坐标[0,1.5708] 终止点坐标[6.28319,1.5708] 起始点坐标[6.28319,-1.5708] 终止点坐标[6.28319,1.5708] 起始点坐标[0,-1.5708] 终止点坐标[6.28319,-1.5708] 起始点坐标[0,-1.5708] 终止点坐标[0,1.5708]
