Method DrawSegment3D

Imaging/Sources/vtkImageCanvasSource2D.cxx:1073–1108

------------------------------------------------------------------------------ Draw a Segment from point a to point b. No clipping or bounds checking.

// Draw a Segment from point a to point b.
// No clipping or bounds checking.
void vtkImageCanvasSource2D::DrawSegment3D(double* a, double* b)
{
  void* ptr;
  int a0, a1, a2;

  // Pre-multiply coords if needed
  if (this->Ratio[0] != 1.0)
  {
    a[0] = static_cast<int>(a[0] * this->Ratio[0]);
    b[0] = static_cast<int>(b[0] * this->Ratio[0]);
  }
  if (this->Ratio[1] != 1.0)
  {
    a[1] = static_cast<int>(a[1] * this->Ratio[1]);
    b[1] = static_cast<int>(b[1] * this->Ratio[1]);
  }
  if (this->Ratio[2] != 1.0)
  {
    a[2] = static_cast<int>(a[2] * this->Ratio[2]);
    b[2] = static_cast<int>(b[2] * this->Ratio[2]);
  }

  ptr = this->ImageData->GetScalarPointer(static_cast<int>(floor(b[0] + 0.5)),
    static_cast<int>(floor(b[1] + 0.5)), static_cast<int>(floor(b[2] + 0.5)));
  a0 = static_cast<int>(floor(a[0] - b[0] + 0.5));
  a1 = static_cast<int>(floor(a[1] - b[1] + 0.5));
  a2 = static_cast<int>(floor(a[2] - b[2] + 0.5));
  switch (this->ImageData->GetScalarType())
  {
    vtkTemplateMacro(vtkImageCanvasSource2DDrawSegment3D(
      this->ImageData, this->DrawColor, static_cast<VTK_TT*>(ptr), a0, a1, a2));
    default:
      vtkErrorMacro(<< "DrawSegment3D: Cannot handle ScalarType.");
  }
  this->Modified();
}

//------------------------------------------------------------------------------
template <class T>