private void RotateImage(RotationOperation operation)
{
vtkImageReslice reslice = vtkImageReslice.New();
vtkTransform transform = vtkTransform.New();
transform.PostMultiply();
double[] center = { 75, 100, 0 };
transform.Translate(-center[0], -center[1], -center[2]);
if (operation == RotationOperation.Forward)
{
transform.RotateZ(90);
}
else if (operation == RotationOperation.Back)
{
transform.RotateZ(-90);
}
transform.Translate(+center[0], +center[1], +center[2]);
transform.Update();
reslice.SetInput(_viewer.GetInput());
reslice.SetResliceTransform(transform);
reslice.Update();
_viewer.SetInput(reslice.GetOutput());
UpdateViewer();
}