VTK初学一，e_Triangle三角形的绘制

#ifndef INITIAL_OPENGL

#define INITIAL_OPENGL

#include <vtkAutoInit.h>

VTK_MODULE_INIT(vtkRenderingOpenGL)

VTK_MODULE_INIT(vtkInteractionStyle)

#endif

#include <iostream>

using namespace std;

#include "vtkPolyDataMapper.h"

#include "vtkWin32OpenGLRenderWindow.h"

#include "vtkRenderWindow.h"

#include "vtkRenderWindowInteractor.h"

#include "vtkRenderer.h"

#include "vtkPoints.h"

#include "vtkWin32RenderWindowInteractor.h"

#include "vtkProperty.h"

#include "vtkFloatArray.h"

#include "vtkPolyData.h"

#include "vtkDataSetMapper.h"

#include "vtkActor2D.h"

#include "vtkContourFilter.h"

#include "vtkContourValues.h"

#include "vtkUnstructuredGrid.h"

#include "vtkPointData.h"

#include "vtkTriangle.h"

#include <vtkInteractorStyleTrackballCamera.h>

void myShow(vtkUnstructuredGrid* aGrid)

{

    vtkSmartPointer<vtkDataSetMapper> aMapper=vtkSmartPointer<vtkDataSetMapper>::New();

    aMapper->SetInputData(aGrid);

    aMapper->ScalarVisibilityOn();

    vtkSmartPointer<vtkActor> anActor=vtkSmartPointer<vtkActor>::New();

    anActor->SetMapper(aMapper);

    anActor->GetProperty()->SetRepresentationToWireframe();

    anActor->GetProperty()->SetDiffuseColor(1,1,1);

    anActor->GetProperty()->SetLineWidth(10);

    vtkSmartPointer<vtkRenderer> ren1=vtkSmartPointer<vtkRenderer>::New();

    vtkSmartPointer<vtkRenderWindow> renWin=vtkSmartPointer<vtkRenderWindow>::New();

    ren1->AddActor(anActor);

    ren1->ResetCamera();

    renWin->AddRenderer(ren1);

    renWin->SetSize(512,512);

    vtkSmartPointer<vtkRenderWindowInteractor> iren=vtkSmartPointer<vtkRenderWindowInteractor>::New();

    vtkSmartPointer<vtkInteractorStyleTrackballCamera> style=vtkSmartPointer<vtkInteractorStyleTrackballCamera>::New();

    iren->SetRenderWindow(renWin);

    iren->SetInteractorStyle(style);

    iren->Start();

}

int main()

{

    //几何数据;

    vtkSmartPointer<vtkPoints> trianglePoints=vtkSmartPointer<vtkPoints>::New();

    trianglePoints->SetNumberOfPoints(3);

    trianglePoints->InsertPoint(0,0,0,0);

    trianglePoints->InsertPoint(1,1,0,0);

    trianglePoints->InsertPoint(2,1,1,1);

    //属性数据

    vtkSmartPointer<vtkFloatArray> triangleScalars=vtkSmartPointer<vtkFloatArray>::New();

    triangleScalars->SetNumberOfTuples(3);

    triangleScalars->InsertValue(0,0);

    triangleScalars->InsertValue(1,0);

    triangleScalars->InsertValue(2,1);

    //拓扑结构

    vtkSmartPointer<vtkTriangle> aTriangle=vtkSmartPointer<vtkTriangle>::New();

    aTriangle->GetPointIds()->SetNumberOfIds(3);

    aTriangle->GetPointIds()->SetId(0,0);

    aTriangle->GetPointIds()->SetId(1,1);

    aTriangle->GetPointIds()->SetId(2,2);

    //将以上三部分组装成一个结构

    vtkSmartPointer<vtkUnstructuredGrid> aTriangleGrid=vtkSmartPointer<vtkUnstructuredGrid>::New();

    aTriangleGrid->Allocate(1,1);

    aTriangleGrid->SetPoints(trianglePoints);

    aTriangleGrid->GetPointData()->SetScalars(triangleScalars);

    aTriangleGrid->InsertNextCell(aTriangle->GetCellType(),aTriangle->GetPointIds());

    //显示triangle

    myShow(aTriangleGrid);

    return 0;

}