Method DrawString

Rendering/GL2PSOpenGL2/vtkOpenGLGL2PSHelperImpl.cxx:283–422

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//------------------------------------------------------------------------------
void vtkOpenGLGL2PSHelperImpl::DrawString(const std::string& str, vtkTextProperty* tprop,
  double pos[3], double backgroundDepth, vtkRenderer* ren)
{
  if (str.empty())
  {
    return;
  }

  vtkTextRenderer* tren(vtkTextRenderer::GetInstance());
  if (tren == nullptr)
  {
    vtkErrorMacro("vtkTextRenderer unavailable.");
    return;
  }

  int dpi = this->RenderWindow->GetDPI();

  // Draw the background if needed:
  if (tprop->GetBackgroundOpacity() > 0.)
  {
    vtkTextRenderer::Metrics metrics;
    if (tren->GetMetrics(tprop, str, metrics, dpi))
    {
      double bgPos[3] = { pos[0], pos[1], backgroundDepth };

      GL2PSvertex bgVerts[5];

      double bgColor[4];
      tprop->GetBackgroundColor(bgColor);
      bgColor[3] = tprop->GetBackgroundOpacity();
      std::copy(bgColor, bgColor + 4, bgVerts[0].rgba);
      std::copy(bgColor, bgColor + 4, bgVerts[1].rgba);
      std::copy(bgColor, bgColor + 4, bgVerts[2].rgba);
      std::copy(bgColor, bgColor + 4, bgVerts[3].rgba);
      std::copy(bgColor, bgColor + 4, bgVerts[4].rgba);

      bgVerts[0].xyz[0] = static_cast<float>(bgPos[0] + metrics.TopLeft[0]);
      bgVerts[0].xyz[1] = static_cast<float>(bgPos[1] + metrics.TopLeft[1]);
      bgVerts[0].xyz[2] = static_cast<float>(bgPos[2]);
      bgVerts[1].xyz[0] = static_cast<float>(bgPos[0] + metrics.BottomLeft[0]);
      bgVerts[1].xyz[1] = static_cast<float>(bgPos[1] + metrics.BottomLeft[1]);
      bgVerts[1].xyz[2] = static_cast<float>(bgPos[2]);
      bgVerts[2].xyz[0] = static_cast<float>(bgPos[0] + metrics.BottomRight[0]);
      bgVerts[2].xyz[1] = static_cast<float>(bgPos[1] + metrics.BottomRight[1]);
      bgVerts[2].xyz[2] = static_cast<float>(bgPos[2]);
      bgVerts[3].xyz[0] = static_cast<float>(bgPos[0] + metrics.TopRight[0]);
      bgVerts[3].xyz[1] = static_cast<float>(bgPos[1] + metrics.TopRight[1]);
      bgVerts[3].xyz[2] = static_cast<float>(bgPos[2]);
      bgVerts[4].xyz[0] = bgVerts[0].xyz[0];
      bgVerts[4].xyz[1] = bgVerts[0].xyz[1];
      bgVerts[4].xyz[2] = bgVerts[0].xyz[2];

      gl2psAddPolyPrimitive(GL2PS_TRIANGLE, 3, bgVerts, 0, 0, 0, 0xffff, 0, 0, 0, 0, 0);
      gl2psAddPolyPrimitive(GL2PS_TRIANGLE, 3, bgVerts + 2, 0, 0, 0, 0xffff, 0, 0, 0, 0, 0);
    }
  }

  // Is this mathtext?