vtk用数组、迭代器访问元素

#include <vtkSmartPointer.h>
#include <vtkImageViewer2.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkRenderer.h>
#include <vtkBMPReader.h>
#include <vtkImageData.h>

int main(int argc, char* argv[])
{

vtkSmartPointer<vtkBMPReader> reader =
vtkSmartPointer<vtkBMPReader>::New();
reader->SetFileName(",,/tmp.bmp");
reader->Update();

int dims[3];
reader->GetOutput()->GetDimensions(dims);

int nbOfComp;
nbOfComp = reader->GetOutput()->GetNumberOfScalarComponents();

for(int k=0; k<dims[2]; k++)
{
for(int j=0; j<dims[1]; j++)
{
for(int i=0; i<dims[0]; i++)
{
if(i<100 && j<100)
{
unsigned char * pixel =
(unsigned char *) ( reader->GetOutput()->GetScalarPointer(i, j, k) );
*pixel = 0;
*(pixel+1) = 0;
*(pixel+2) = 0;
}
}
}
}

vtkSmartPointer<vtkImageViewer2> imageViewer =
vtkSmartPointer<vtkImageViewer2>::New();
imageViewer->SetInputConnection(reader->GetOutputPort());

vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor =
vtkSmartPointer<vtkRenderWindowInteractor>::New();
imageViewer->SetupInteractor(renderWindowInteractor);
imageViewer->Render();
imageViewer->GetRenderer()->ResetCamera();
imageViewer->Render();

imageViewer->GetRenderer()->SetBackground(1.0, 1.0, 1.0);
imageViewer->SetSize(640, 480);
imageViewer->GetRenderWindow()->SetWindowName("VisitImagePixelDirectlyExample");

renderWindowInteractor->Start();

return EXIT_SUCCESS;
}

#include <vtkSmartPointer.h>
#include <vtkImageViewer2.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkRenderer.h>
#include <vtkBMPReader.h>
#include <vtkImageData.h>
#include <vtkImageIterator.h>

//测试图像：../lena.bmp
int main(int argc, char* argv[])
{
//依旧是正常的读入
vtkSmartPointer<vtkBMPReader> reader =
vtkSmartPointer<vtkBMPReader>::New();
reader->SetFileName("../lena.bmp");
reader->Update();

//设置变换的子区域 六个值分别代表x,y,z的最小值最大值
int subRegion[6] = { 0, 300, 0, 300, 0, 0 };
//两个参数：要访问的图像和访问区域
vtkImageIterator<unsigned char> it(reader->GetOutput(), subRegion);
//注意这里两个while循环
while (!it.IsAtEnd())
{
unsigned char *inSI = it.BeginSpan();
unsigned char *inSIEnd = it.EndSpan();

while (inSI != inSIEnd)//组内
{
*inSI = 255 - *inSI;
++inSI;
}
it.NextSpan();
}

vtkSmartPointer<vtkImageViewer2> imageViewer =
vtkSmartPointer<vtkImageViewer2>::New();
imageViewer->SetInputConnection(reader->GetOutputPort());

vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor =
vtkSmartPointer<vtkRenderWindowInteractor>::New();
imageViewer->SetupInteractor(renderWindowInteractor);
imageViewer->Render();
imageViewer->GetRenderer()->ResetCamera();
imageViewer->Render();

imageViewer->GetRenderer()->SetBackground(1.0, 1.0, 1.0);
imageViewer->SetSize(640, 480);
imageViewer->GetRenderWindow()->SetWindowName("VisitImagePixelIterativelyExample");

renderWindowInteractor->Start();

return EXIT_SUCCESS;
}