vtk-m2/vtkm/rendering/ColorBarAnnotation.cxx

//============================================================================
//  Copyright (c) Kitware, Inc.
//  All rights reserved.
//  See LICENSE.txt for details.
//  This software is distributed WITHOUT ANY WARRANTY; without even
//  the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
//  PURPOSE.  See the above copyright notice for more information.
//
//  Copyright 2016 Sandia Corporation.
//  Copyright 2016 UT-Battelle, LLC.
//  Copyright 2016 Los Alamos National Security.
//
//  Under the terms of Contract DE-AC04-94AL85000 with Sandia Corporation,
//  the U.S. Government retains certain rights in this software.
//
//  Under the terms of Contract DE-AC52-06NA25396 with Los Alamos National
//  Laboratory (LANL), the U.S. Government retains certain rights in
//  this software.
//============================================================================

#include <vtkm/rendering/ColorBarAnnotation.h>

namespace vtkm {
namespace rendering {

ColorBarAnnotation::ColorBarAnnotation()
{  }

ColorBarAnnotation::~ColorBarAnnotation()
{  }

void ColorBarAnnotation::SetRange(const vtkm::Range &range,
                                  vtkm::IdComponent numTicks)
{
  std::vector<vtkm::Float64> positions, proportions;
  this->Axis.SetMinorTicks(positions, proportions); // clear any minor ticks

  for (vtkm::IdComponent i=0; i<numTicks; ++i)
  {
    vtkm::Float64 prop =
        static_cast<vtkm::Float64>(i) / static_cast<vtkm::Float64>(numTicks-1);
    vtkm::Float64 pos = range.Min + prop*range.Length();
    positions.push_back(pos);
    proportions.push_back(prop);
  }
  this->Axis.SetMajorTicks(positions, proportions);
}

void ColorBarAnnotation::Render(
    const vtkm::rendering::Camera &camera,
    const vtkm::rendering::WorldAnnotator &worldAnnotator,
    vtkm::rendering::Canvas &canvas)
{
  vtkm::Bounds bounds(vtkm::Range(-0.88, +0.88),
                      vtkm::Range(+0.87, +0.92),
                      vtkm::Range(0, 0));

  canvas.AddColorBar(bounds, this->ColorTable, true);

  this->Axis.SetColor(vtkm::rendering::Color(1,1,1));
  this->Axis.SetLineWidth(1);
  this->Axis.SetScreenPosition(bounds.X.Min, bounds.Y.Min,
                               bounds.X.Max, bounds.Y.Min);
  this->Axis.SetMajorTickSize(0, .02, 1.0);
  this->Axis.SetMinorTickSize(0,0,0); // no minor ticks
  this->Axis.SetLabelAlignment(TextAnnotation::HCenter,
                               TextAnnotation::Top);
  this->Axis.Render(camera, worldAnnotator, canvas);
}

}
} // namespace vtkm::rendering