Question

我已经将C＃位图转换为无符号char数组，并能够使用以下代码显示图像：

void VTKCaller::Render2DImage(unsigned char * iImageBytes, int iWidth, int iHeight, int iBytesPerPixel, int iStrideSize)
{
    vtkSmartPointer<vtkImageData> imageData = vtkSmartPointer<vtkImageData>::New();
    imageData->SetDimensions(iWidth, iHeight, 1);
    imageData->SetOrigin(0.0, 0.0, 0.0);
    imageData->SetSpacing(1.0, 1.0, 1.0);
    imageData->AllocateScalars(VTK_UNSIGNED_CHAR, iBytesPerPixel);
    // Some loops here ...
        imageData->SetScalarComponentFromFloat(...);

    vtkSmartPointer<vtkImageMapper> imageMapper = vtkSmartPointer<vtkImageMapper>::New();
    imageMapper->SetInputData(imageData);
    imageMapper->SetColorWindow(255); // width of the color range to map to
    imageMapper->SetColorLevel(127.5); // center of the color range to map to

    vtkSmartPointer<vtkActor2D> actor = vtkSmartPointer<vtkActor2D>::New();
    actor->SetMapper(imageMapper);

    vtkSmartPointer<vtkRenderer> renderer = vtkSmartPointer<vtkRenderer>::New();
    renderer->AddActor(actor);

    vtkSmartPointer<vtkRenderWindow> renWin = vtkSmartPointer<vtkRenderWindow>::New();
    renWin->AddRenderer(renderer);

    vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor =
        vtkSmartPointer<vtkRenderWindowInteractor>::New();
    renderWindowInteractor->SetRenderWindow(renWin);

    renWin->Render();
    renderWindowInteractor->Start();
}

但是图像不会调整大小。我试图actor-> SetWidth或SetHeight，它不起作用。请指教。非常感谢。

Answer 1

这是如何调整图像大小的方法（来自VTK示例）：

vtkSmartPointer<vtkImageResize> resize =
vtkSmartPointer<vtkImageResize>::New();  
resize->SetInputData(imageData);
resize->SetOutputDimensions(newSizeX, newSizeY, 1);
resize->Update();

而且，我不确定，是否仍然需要将actor标记为已修改，以便刷新输出：

actor->Modified();

持有vtkImageData的vtkActor2D的图像大小调整问题

1 个答案: