VTK学习之路——画画我的小苹果

示例程序的代码如下：

#include "stdafx.h"
#include <vtkPoints.h>
#include <vtkSmartPointer.h>
#include <vtkCellArray.h>
#include <vtkPolyData.h>
#include <vtkPolyDataMapper.h>
#include <vtkRotationalExtrusionFilter.h>
#include <vtkActor.h>
#include <vtkProperty.h>
#include <vtkRenderer.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
int _tmain(int argc, _TCHAR* argv[])
{
     //定义苹果轮廓线的点坐标
    vtkSmartPointer<vtkPoints>pPoints=vtkPoints::New();
    pPoints->InsertPoint(0,0.0,0.0,1.5);
    pPoints->InsertPoint(1,1.0,0.0,1);
    pPoints->InsertPoint(2,2.0,0.0,1.5);
    pPoints->InsertPoint(3,3.0,0.0,2.5);
    pPoints->InsertPoint(4,3.5,0.0,3.0);
    pPoints->InsertPoint(5,4.0,0.0,5.0);
    pPoints->InsertPoint(6,3.5,0.0,6.0);
    pPoints->InsertPoint(7,2.0,0.0,7.0);
    pPoints->InsertPoint(8,1.0,0.0,6.0);
    pPoints->InsertPoint(9,0.0,0.0,5.0);
    //构建线单元，绘制轮廓线
    vtkSmartPointer<vtkCellArray>pLineCell=vtkCellArray::New();
    //构建一个单元，由10个点构成
    pLineCell->InsertNextCell(10);
    //构成单元点集的索引号
    pLineCell->InsertCellPoint(0);
    pLineCell->InsertCellPoint(1);
    pLineCell->InsertCellPoint(2);
    pLineCell->InsertCellPoint(3);
    pLineCell->InsertCellPoint(4);
    pLineCell->InsertCellPoint(5);
    pLineCell->InsertCellPoint(6);
    pLineCell->InsertCellPoint(7);
    pLineCell->InsertCellPoint(8);
    pLineCell->InsertCellPoint(9);
    //定义多边形数据集
    vtkSmartPointer<vtkPolyData>pPolyData=vtkPolyData::New();
    //设置构成多边形的几何数据
    pPolyData->SetPoints(pPoints);
    //设置单元类型，线单元
    pPolyData->SetLines(pLineCell);
    //压制轮廓线，形成苹果实体
    vtkSmartPointer<vtkRotationalExtrusionFilter>pExtruFilter=vtkRotationalExtrusionFilter::New();
    pExtruFilter->SetInput(pPolyData);
    //设置生成苹果表面的光滑度参数,苹果的表面由多少个面构成
    pExtruFilter->SetResolution(10);
    //将数据映射到图形系统进行绘制
    vtkSmartPointer<vtkPolyDataMapper>pMap=vtkPolyDataMapper::New();
   pMap->SetInput(pExtruFilter->GetOutput());
   vtkSmartPointer<vtkActor>pActor=vtkActor::New();
   pActor->SetMapper(pMap);
   pActor->GetProperty()->SetColor(0.0,1.0,0.0);
    //绘制
   vtkSmartPointer<vtkRenderer>pRen=vtkRenderer::New();
   pRen->AddActor(pActor);
   //创建绘制窗体
   vtkSmartPointer<vtkRenderWindow>pRenWin=vtkRenderWindow::New();
   pRenWin->AddRenderer(pRen);
   //创建交互器
   vtkSmartPointer<vtkRenderWindowInteractor>pIren=vtkRenderWindowInteractor::New();
   pIren->SetRenderWindow(pRenWin);
    //设置背景颜色
   pRen->SetBackground(1,1,1);
   //设置窗口尺寸
   pRenWin->SetSize(300,300);
   pRenWin->Render();
   pRen->ResetCamera();
   //开始绘制
   pIren->Initialize();
   pIren->Start();
   return 0;
}