vtkTransform实例 1

 1. 4*4矩阵类vtkMatrix4x4

　　接口函数：void SetElement(int i, int j, double value),i行、j列的值为value

#ifndef INITIAL_OPENGL
#define INITIAL_OPENGL
#include <vtkAutoInit.h>
VTK_MODULE_INIT(vtkRenderingOpenGL)
VTK_MODULE_INIT(vtkInteractionStyle)
VTK_MODULE_INIT(vtkRenderingFreeType)
#endif
#include <iostream>
using namespace std;
#include<vtkSmartPointer.h>
#include<vtkPerspectiveTransform.h>
#include <vtkMatrix4x4.h>
#include <vtkTransform.h>

int main()
{
    vtkSmartPointer<vtkMatrix4x4> m=vtkSmartPointer<vtkMatrix4x4>::New();
    double ma[4][4]={{1,2,3,4},
                     {2,2,3,4},
                     {3,2,3,4},
                     {4,2,3,4}};
    for(int i=0;i<4;i++)
    {
        for(int j=0;j<4;j++)
        {
            //void SetElement(int i, int j, double value),i行、j列的值为value
            m->SetElement(i,j,ma[i][j]);
        }
    }
    //普通变换
    vtkSmartPointer<vtkTransform> transform=vtkSmartPointer<vtkTransform>::New();
    transform->SetMatrix(m);
    double p[3]={1,2,3};//原始点
    double normalProjection[3];//投影变换后的点坐标
    transform->TransformPoint(p,normalProjection);
    cout<<"Original point     :"<<p[0]<<","<<p[1]<<","<<p[2]<<endl;
    cout<<"Standard projection:"<<normalProjection[0]<<","<<normalProjection[1]<<","<<normalProjection[2]<<endl;
    //透视投影变换
    double perspectiveProjection[3];
    vtkSmartPointer<vtkPerspectiveTransform>perspectiveTransform=vtkSmartPointer<vtkPerspectiveTransform>::New();
    perspectiveTransform->SetMatrix(m);
    perspectiveTransform->TransformPoint(p,perspectiveProjection);
    cout<<"Perspective projection:"<<perspectiveProjection[0]<<","<<perspectiveProjection[1]<<","<<perspectiveProjection[2]<<endl;
    return 0;
}

#ifndefINITIAL_OPENGL

#defineINITIAL_OPENGL

#include<vtkAutoInit.h>

VTK_MODULE_INIT(vtkRenderingOpenGL)

VTK_MODULE_INIT(vtkInteractionStyle)

VTK_MODULE_INIT(vtkRenderingFreeType)

#endif

#include<iostream>

usingnamespacestd;

#include<vtkSmartPointer.h>

#include<vtkPerspectiveTransform.h>

#include<vtkMatrix4x4.h>

#include<vtkTransform.h>

intmain()

{

vtkSmartPointer<vtkMatrix4x4>m=vtkSmartPointer<vtkMatrix4x4>::New();

doublema[4][4]={{1,2,3,4},

{2,2,3,4},

{3,2,3,4},

{4,2,3,4}};

for(inti=0;i<4;i++)

{

for(intj=0;j<4;j++)

{

//voidSetElement(inti,intj,doublevalue),i行、j列的值为value

m->SetElement(i,j,ma[i][j]);

}

}

//普通变换

vtkSmartPointer<vtkTransform>transform=vtkSmartPointer<vtkTransform>::New();

transform->SetMatrix(m);

doublep[3]={1,2,3};//原始点

doublenormalProjection[3];//投影变换后的点坐标

transform->TransformPoint(p,normalProjection);

cout<<"Originalpoint:"<<p[0]<<","<<p[1]<<","<<p[2]<<endl;

cout<<"Standardprojection:"<<normalProjection[0]<<","<<normalProjection[1]<<","<<normalProjection[2]<<endl;

//透视投影变换

doubleperspectiveProjection[3];

vtkSmartPointer<vtkPerspectiveTransform>perspectiveTransform=vtkSmartPointer<vtkPerspectiveTransform>::New();

perspectiveTransform->SetMatrix(m);

perspectiveTransform->TransformPoint(p,perspectiveProjection);

cout<<"Perspectiveprojection:"<<perspectiveProjection[0]<<","<<perspectiveProjection[1]<<","<<perspectiveProjection[2]<<endl;

return0;

}