Method DrawImage

Imaging/Sources/vtkImageCanvasSource2D.cxx:139–236

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//------------------------------------------------------------------------------
void vtkImageCanvasSource2D::DrawImage(
  int x0, int y0, vtkImageData* image, int sx, int sy, int width, int height)
{
  if (!image)
  {
    return;
  }

  vtkImageClip* clip = vtkImageClip::New();
  clip->SetInputData(image);

  int* extent;
  int ext[6];
  int z = this->DefaultZ;
  image->GetExtent(ext);
  if (sx < 0)
  {
    sx = ext[0];
  }
  if (sy < 0)
  {
    sy = ext[2];
  }
  if (width < 0)
  {
    width = ext[1] - ext[0] + 1;
  }
  else
  {
    width = vtkMath::Min(width, ext[1] - ext[0] + 1);
  }
  if (height < 0)
  {
    height = ext[3] - ext[2] + 1;
  }
  else
  {
    height = vtkMath::Min(height, ext[3] - ext[2] + 1);
  }
  ext[0] = vtkMath::Max(sx, ext[0]);
  ext[1] = vtkMath::Max(sx + width - 1, ext[1]);
  ext[2] = vtkMath::Max(sy, ext[2]);
  ext[3] = vtkMath::Max(sy + height - 1, ext[3]);
  clip->SetOutputWholeExtent(ext);

  vtkImageCast* ic = vtkImageCast::New();
  ic->SetInputConnection(clip->GetOutputPort());
  ic->SetOutputScalarType(this->ImageData->GetScalarType());
  ic->Update();
  int min0, max0, min1, max1;
  min0 = x0;
  min1 = y0;

  max0 = x0 + width - 1;
  max1 = y0 + height - 1;

  // Pre-multiply coords if needed
  if (this->Ratio[0] != 1.0)