Method UpdateQuad

Rendering/Core/vtkTextMapper.cxx:395–478

------------------------------------------------------------------------------

//------------------------------------------------------------------------------
void vtkTextMapper::UpdateQuad(vtkActor2D* actor, int dpi)
{
  vtkDebugMacro(<< "UpdateQuad called");

  // Update texture coordinates:
  if (this->Image->GetMTime() > this->TCoordsTime)
  {
    int dims[3];
    this->Image->GetDimensions(dims);

    // The coordinates are calculated to be centered on a texel and
    // trim the padding from the image. (padding is often added to
    // create textures that have power-of-two dimensions)
    float tw = static_cast<float>(this->TextDims[0]);
    float th = static_cast<float>(this->TextDims[1]);
    float iw = static_cast<float>(dims[0]);
    float ih = static_cast<float>(dims[1]);
    float tcXMin = 0;
    float tcYMin = 0;
    float tcXMax = tw / iw;
    float tcYMax = th / ih;
    if (vtkFloatArray* tc =
          vtkArrayDownCast<vtkFloatArray>(this->PolyData->GetPointData()->GetTCoords()))
    {
      vtkDebugMacro(<< "Setting tcoords: xmin, xmax, ymin, ymax: " << tcXMin << ", " << tcXMax
                    << ", " << tcYMin << ", " << tcYMax);
      tc->Reset();
      tc->InsertNextValue(tcXMin);
      tc->InsertNextValue(tcYMin);

      tc->InsertNextValue(tcXMin);
      tc->InsertNextValue(tcYMax);

      tc->InsertNextValue(tcXMax);
      tc->InsertNextValue(tcYMax);

      tc->InsertNextValue(tcXMax);
      tc->InsertNextValue(tcYMin);
      tc->Modified();

      this->TCoordsTime.Modified();
    }
    else
    {
      vtkErrorMacro(<< "Invalid texture coordinate array type.");
    }
  }

  if (this->CoordsTime < actor->GetMTime() || this->CoordsTime < this->TextProperty->GetMTime() ||
    this->CoordsTime < this->TCoordsTime)
  {
    int text_bbox[4];
    vtkTextRenderer* tren = vtkTextRenderer::GetInstance();
    if (tren)
    {
      if (!tren->GetBoundingBox(
            this->TextProperty, this->Input ? this->Input : std::string(), text_bbox, dpi))
      {