VTK初学一，b_PolyVertex多个图形点的绘制

#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 "vtkVertex.h"

#include "vtkPolyVertex.h"

#include "vtkInteractorStyleTrackballCamera.h"

void myShow(vtkSmartPointer<vtkUnstructuredGrid> aGrid);

int main()

{

    //几何数据

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

//    points->SetNumberOfPoints(5);//此行可有可无

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

    points->InsertPoint(1,0.5,0.5,0);

    points->InsertPoint(2,-0.3,-0.2,0);

    points->InsertPoint(3,0.8,-0.5,0);

    points->InsertPoint(4,1,0.5,0.3);

    //拓扑数据

    vtkSmartPointer<vtkPolyVertex>polyVertex=vtkSmartPointer<vtkPolyVertex>::New();

    polyVertex->GetPointIds()->SetNumberOfIds(5);//必须设置Id个数，否则可以编译，不能运行

    polyVertex->GetPointIds()->SetId(0,0);//第一个参数是几何point的ID号，第2个参数是拓扑中的Id号

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

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

    polyVertex->GetPointIds()->SetId(3,3);

    polyVertex->GetPointIds()->SetId(4,4);

    //属性数据

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

    pointsScalars->SetNumberOfTuples(5);//此行可有可无

    pointsScalars->InsertValue(0,0);//第1个参数是points点的Id，第2个参数是该点的属性值

    pointsScalars->InsertValue(1,0);//第1个参数是points点的Id，第2个参数是该点的属性值

    pointsScalars->InsertValue(2,0);//第1个参数是points点的Id，第2个参数是该点的属性值

    pointsScalars->InsertValue(3,0);//第1个参数是points点的Id，第2个参数是该点的属性值

    pointsScalars->InsertValue(4,0);//第1个参数是points点的Id，第2个参数是该点的属性值

    //将以上三部分数据组合成一个结构vtkUnstructureGrid

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

    aGrid->Allocate(1,1);

    aGrid->SetPoints(points);

    aGrid->GetPointData()->SetScalars(pointsScalars);

    aGrid->InsertNextCell(polyVertex->GetCellType(),polyVertex->GetPointIds());

    //在窗口中显示多个Vertex

    myShow(aGrid);

    return 0;

}

void myShow(vtkSmartPointer<vtkUnstructuredGrid> aGrid)

{

    //设置映射器

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

    aMapper->SetInputData(aGrid);

    aMapper->ScalarVisibilityOn();

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

    anActor->SetMapper(aMapper);

    anActor->GetProperty()->SetRepresentationToPoints();

    anActor->GetProperty()->SetDiffuseColor(1,0,0);

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

 //创建显示窗口

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

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

    ren1->AddActor(anActor);

    renWin->AddRenderer(ren1);

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

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

    iren->SetInteractorStyle(style);

    iren->SetRenderWindow(renWin);

    renWin->SetSize(700,700);

    ren1->ResetCamera();

    renWin->Render();

    iren->Start();

}