Method DrawQuad

Rendering/ContextOpenGL2/vtkOpenGLContextDevice2D.cxx:1241–1267

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void vtkOpenGLContextDevice2D::DrawQuad(float* f, int n)
{
  if (SkipDraw())
  {
    return;
  }

  if (!f || n <= 0)
  {
    vtkWarningMacro(<< "Points supplied that were not of type float.");
    return;
  }

  // convert quads to triangles
  std::vector<float> tverts;
  int numTVerts = 6 * n / 4;
  tverts.resize(numTVerts * 2);
  int offset[6] = { 0, 1, 2, 0, 2, 3 };
  for (int i = 0; i < numTVerts; i++)
  {
    int index = 2 * (4 * (i / 6) + offset[i % 6]);
    tverts[i * 2] = f[index];
    tverts[i * 2 + 1] = f[index + 1];
  }

  this->CoreDrawTriangles(tverts);
}

void vtkOpenGLContextDevice2D::CoreDrawTriangles(
  std::vector<float>& tverts, unsigned char* colors, int numComp)