vtk-m2/vtkm/rendering/ColorBarAnnotation.h

//============================================================================
//  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.
//============================================================================
#ifndef vtk_m_rendering_ColorBarAnnotation_h
#define vtk_m_rendering_ColorBarAnnotation_h

#include <vtkm/cont/DataSet.h>
#include <vtkm/rendering/AxisAnnotation2D.h>
#include <vtkm/rendering/Camera.h>
#include <vtkm/rendering/Canvas.h>
#include <vtkm/rendering/ColorTable.h>


namespace vtkm {
namespace rendering {

class ColorBarAnnotation
{
protected:
  vtkm::rendering::ColorTable colortable;
  vtkm::rendering::AxisAnnotation2D axis;
public:
  ColorBarAnnotation()
  {
  }
  void SetColorTable(const vtkm::rendering::ColorTable &ct)
  {
    colortable = ct;
  }
  void SetRange(vtkm::Float64 l, vtkm::Float64 h, int nticks)
  {
    std::vector<vtkm::Float64> pos, prop;
    axis.SetMinorTicks(pos, prop); // clear any minor ticks

    for (int i=0; i<nticks; ++i)
    {
      vtkm::Float64 p = static_cast<vtkm::Float64>(i) / static_cast<vtkm::Float64>(nticks-1);
      vtkm::Float64 v = l + p*(h-l);
      pos.push_back(v);
      prop.push_back(p);
    }
    axis.SetMajorTicks(pos, prop);
  }
  void SetRange(const vtkm::Range &range, int nticks)
  {
    this->SetRange(range.Min, range.Max, nticks);
  }

  virtual void Render(const vtkm::rendering::Camera &camera,
                      const vtkm::rendering::WorldAnnotator &worldAnnotator,
                      vtkm::rendering::Canvas &canvas)
  {
    vtkm::Float32 l = -0.88f, r = +0.88f;
    vtkm::Float32 b = +0.87f, t = +0.92f;

    canvas.AddColorBar(l, t, r-l, b-t,
                              colortable, true);

    axis.SetColor(Color(1,1,1));
    axis.SetLineWidth(1);
    axis.SetScreenPosition(l,b, r,b);
    axis.SetMajorTickSize(0, .02, 1.0);
    axis.SetMinorTickSize(0,0,0); // no minor ticks
    axis.SetLabelAlignment(TextAnnotation::HCenter,
                           TextAnnotation::Top);
    axis.Render(camera, worldAnnotator, canvas);
  }
};

}} //namespace vtkm::rendering

#endif // vtk_m_rendering_ColorBarAnnotation_h