从点 - 编程之家

如何解决从点

我只想用 opencascade 编写两个简单的函数，以便从 C# winform 应用程序调用：一个用于从点创建曲面，一个用于获取曲面的点。我不是用 C++ 编写的，而是遵循 opencascade 示例并通过文档和代码的和平来实现这一点：

OCCProxy.h

#pragma once

#ifdef OCCTPROXY_EXPORTS
#define OCCTPROXY_API __declspec(dllexport)
#else
#define OCCTPROXY_API __declspec(dllimport)
#endif

extern "C" OCCTPROXY_API void PtsToSrf(double points[][3],int ptsNumber);

extern "C" OCCTPROXY_API void GetSrfPoint(double u,double v,double& x,double& y,double& z);

OCCProxy.cpp

#include "GeomAbs_Shape.hxx"
#include "Geom_BSplinesurface.hxx"
#include "GeomAPI_PointsToBSplinesurface.hxx"
#include "gp_Pnt.hxx"
#include "NCollection_Mat4.hxx"
#include "OCCTProxy.h"
#include "pch.h"
#include "Standard_Handle.hxx"
#include "TColgp_Array2OfPnt.hxx"

//Approximated surface
Handle(Geom_BSplinesurface) srf; //line 12

//Create approximated surface from a list of point
void PtsToSrf(double points[][3],int ptsNumber)
{
    //convert double array points array     
    TColgp_Array2OfPnt pts(0,ptsNumber,0);
    for (int i = 0; i < ptsNumber; i++) 
        for (int j = 0; i < 3; i++)
        {
            gp_Pnt pt = gp_Pnt(
                points[i][0],points[i][1],points[i][2]);
            pts.SetValue(i,pt);
        }   

    //approximate a BSpline surface passing through an array of points
    GeomAPI_PointsToBSplinesurface srf_approximator(   //line 28
        pts,3,8,GeomAbs_C2,0.001);   //line 29
    srf = srf_approximator.Surface();   //line 30   
}

//Get approximated surface point
void GetSrfPoint(double u,double& z)
{
    gp_Pnt p;
    srf->D0(u,v,p);   //line 38
    
    x = p.X();
    y = p.Y();
    z = p.Z();
}

我在“OCCProxy.cpp”中收到以下列表错误：

C2065 'Geom_BSplinesurface'：未声明的标识符 [第 12 行]

C2923“opencascade::handle”：“Geom_BSplinesurface”不是参数“T”的有效模板类型参数[第 12 行]

C2133 'srf'：未知大小 [第 12 行]

C2512 'opencascade::handle'：没有合适的默认构造函数可用 [第 12 行]

C2065 'GeomAPI_PointsToBSplinesurface'：未声明的标识符 [第 28 行]

C2146 语法错误：缺少“;”在标识符 'srf_approximator' 之前 [第 28 行]

C2065 'GeomAbs_C2'：未声明的标识符 [第 29 行]

C3861 'srf_approximator'：未找到标识符 [第 28 行]

C2065 'srf_approximator'：未声明的标识符 [第 30 行]

C2678 二进制“->”：未找到采用“opencascade::handle”类型左侧操作数的运算符（或没有可接受的转换） [第 38 行]

C2039 'D0'：不是 'opencascade::handle' 的成员 [第 38 行]

也许他们是非常愚蠢的问题，但我无法解决。

感谢您的帮助

乔瓦尼

编辑 - Geom_BSplinesurface 的定义

class Geom_BSplinesurface;
DEFINE_STANDARD_HANDLE(Geom_BSplinesurface,Geom_BoundedSurface)

class Geom_BSplinesurface : public Geom_BoundedSurface
{

public:

  Standard_EXPORT Geom_BSplinesurface(const TColgp_Array2OfPnt& Poles,const TColStd_Array1OfReal& UKnots,const TColStd_Array1OfReal& VKnots,const TColStd_Array1OfInteger& UMults,const TColStd_Array1OfInteger& VMults,const Standard_Integer UDegree,const Standard_Integer VDegree,const Standard_Boolean UPeriodic = Standard_False,const Standard_Boolean VPeriodic = Standard_False);

  Standard_EXPORT Geom_BSplinesurface(const TColgp_Array2OfPnt& Poles,const TColStd_Array2OfReal& Weights,const Standard_Boolean VPeriodic = Standard_False);

  ... methods

 Standard_EXPORT Handle(Geom_Geometry) copy() const Standard_OVERRIDE;

  ... other methods And fields
}

解决方法

最后，我可以在我的计算机上复制并解决问题。

问题出在第 #include "pch.h" 行。这是预编译的头文件。 必须首先包含它。请参阅此处了解原因：What is "pch.h" and why is it needed to be included as the first header file?

所以只需将 #include "pch.h" 作为第一行，你会没事的。

#include "pch.h"
#include <GeomAbs_Shape.hxx>
#include <Geom_BSplineSurface.hxx>
#include <GeomAPI_PointsToBSplineSurface.hxx>
#include "gp_Pnt.hxx"
#include "NCollection_Mat4.hxx"
#include "OCCProxy.h"
#include "Standard_Handle.hxx"
#include "TColgp_Array2OfPnt.hxx"




//Approximated surface
Handle(Geom_BSplineSurface) srf; //line 12

//Create approximated surface from a list of point
extern "C" OCCTPROXY_API void PtsToSrf(double points[][3],int ptsNumber)
{
    //convert double array points array     
    TColgp_Array2OfPnt pts(0,ptsNumber,0);
    for (int i = 0; i < ptsNumber; i++)
        for (int j = 0; i < 3; i++)
        {
            gp_Pnt pt = gp_Pnt(
                points[i][0],points[i][1],points[i][2]);
            pts.SetValue(i,pt);
        }

    //approximate a BSpline surface passing through an array of points
    GeomAPI_PointsToBSplineSurface srf_approximator(   //line 28
        pts,3,8,GeomAbs_C2,0.001);   //line 29
    srf = srf_approximator.Surface();   //line 30   
}
//
////Get approximated surface point
extern "C" OCCTPROXY_API void GetSrfPoint(double u,double v,double& x,double& y,double& z)
{
    gp_Pnt p;
    srf->D0(u,v,p);   //line 38

    x = p.X();
    y = p.Y();
    z = p.Z();
}