OpenCASCADE gp包说明

//------------------------------------------------------------------------------
//    Copyright (c) 2012 eryar All Rights Reserved.
//
//        File    : Main.cpp
//        Author  : eryar@163.com
//        Date    : 2012-6-23 21:30
//        Version : 1.0v
//
//    Description : Test primitive Geometric Types in OpenCASCADE.
//
//      The Geometric Processor package, called gp.
//
//      The pg package offers classes for both 2D and 3D objects which
//      are handled by value rather than by reference. When this sort of object
//      is copied, it is copied entirely. Changes in one instance will not be 
//      reflected in another.
//
//==============================================================================
 
// Use Toolkit TKernel.
#pragma comment(lib,"TKernel.lib")
// Use Toolkit TKMath.
#pragma comment(lib, "TKMath.lib")
 
#include <gp.hxx>
#include <gp_Pnt.hxx>
#include <gp_Trsf.hxx>
#include <Precision.hxx>
 
void DumpPoint(const gp_Pnt& p);
 
int main(int argc, char* argv[])
{
    gp_Pnt  aPoint(0, 0, 0);
 
    // 1. Translate a point in a direction.
    // The direction determined by a gp_Vec or two gp_Pnt.
    cout<<"Before translated:";
    DumpPoint(aPoint);
 
    aPoint.Translate(gp_Pnt(2, 2, 3), gp_Pnt(10, 10, 0));
 
    cout<<"After translated:";
    DumpPoint(aPoint);
 
    // 2. Rotate a point.
    // Rotate a point by an axis and the rotate angle.
    cout<<"Before rotated:";
    DumpPoint(aPoint);
 
    // Roate 45 degree about Z axis.
    // Positive angle value will be rotated counterclockwise.
    aPoint.Rotate(gp::OZ(), PI/4);
    
    cout<<"After rotated 45 degree about Z axis:";
    DumpPoint(aPoint);
 
    // 2.1 Test Package Precision.
    if (aPoint.X() < Precision::Confusion() && aPoint.X() > -Precision::Confusion())
    {
        cout<<"Point X value:"<<aPoint.X()<<endl;
        cout<<"Precision::Confusion() value:"<<Precision::Confusion()<<endl;
    }
 
    aPoint.Rotate(gp::OZ(), PI/4);
    cout<<"After rotate 45 degree about Z axis:";
    DumpPoint(aPoint);
 
    // 3. Transform a point by gp_Trsf.
    gp_Trsf transform;
    transform.SetMirror(gp::OX());
 
    cout<<"Before gp_Trsf:";
    DumpPoint(aPoint);
 
    aPoint.Transform(transform);
 
    cout<<"After gp_Trsf:";
    DumpPoint(aPoint);
 
    // 4. Mirror a point.
    // 4.1 Performs the symmetrical transformation of
    // a point with respect to an axis placement which
    // is the axis of the symmetry.
    cout<<"Before mirrored with a symmetric axis:";
    DumpPoint(aPoint);
 
    aPoint.Mirror(gp::OY());
 
    cout<<"After mirrored with a symmetric axis:";
    DumpPoint(aPoint);
 
    // 4.2 Performs the symmetrical transformation of
    // a point with respect to a plane.
    cout<<"Before mirrored with a symmetric plane:";
    DumpPoint(aPoint);
 
    aPoint.Mirror(gp::XOY());
 
    cout<<"After mirrored with a symmetric plane";
    DumpPoint(aPoint);
 
    // 5. Scale a point.
    aPoint.SetCoord(1, 2, 1);
    cout<<"Before Scaled:";
    DumpPoint(aPoint);
 
    /*
    // Scale point source code...
    inline void gp_Pnt::Scale (const gp_Pnt& P,
    const Standard_Real S)
    {
    gp_XYZ XYZ = P.coord;
    XYZ.Multiply (1.0 - S);
    coord.Multiply (S);
    coord.Add      (XYZ);
    }
    */
 
    aPoint.Scale(gp_Pnt(1, 2, 2), 2);
 
    cout<<"After Scaled:";
    DumpPoint(aPoint);
 
    return 0;
}
 
/**
* Description: Dump point information.
*/
void DumpPoint( const gp_Pnt& p )
{
    cout<<"("<<p.X()<<","<<p.Y()<<","<<p.Z()<<")"<<endl;
}

/*
输出结果如下：
   1:  Before translated:(0,0,0)
   2:  After translated:(8,8,-3)
   3:  Before rotated:(8,8,-3)
   4:  After rotated 45 degree about Z axis:(8.88178e-016,11.3137,-3)
   5:  Point X value:8.88178e-016
   6:  Precision::Confusion() value:1e-007
   7:  After rotate 45 degree about Z axis:(-8,8,-3)
   8:  Before gp_Trsf:(-8,8,-3)
   9:  After gp_Trsf:(-8,-8,3)
  10:  Before mirrored with a symmetric axis:(-8,-8,3)
  11:  After mirrored with a symmetric axis:(8,-8,-3)
  12:  Before mirrored with a symmetric plane:(8,-8,-3)
  13:  After mirrored with a symmetric plane(8,-8,3)
  14:  Before Scaled:(1,2,1)
  15:  After Scaled:(1,2,0)
  16:  Press any key to continue . . .
*/