otbRegionGlComponent.h

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/*=========================================================================

  Program:   ORFEO Toolbox
  Language:  C++
  Date:      $Date$
  Version:   $Revision$


  Copyright (c) Centre National d'Etudes Spatiales. All rights reserved.
  See OTBCopyright.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 notices for more information.

=========================================================================*/
#ifndef __otbRegionGlComponent_h
#define __otbRegionGlComponent_h

#include "otbGlComponent.h"
#include "itkImageRegion.h"

namespace otb
{
class RegionGlComponent
  : public GlComponent
{
public:
  typedef RegionGlComponent             Self;
  typedef GlComponent                   Superclass;
  typedef itk::SmartPointer<Self>       Pointer;
  typedef itk::SmartPointer<const Self> ConstPointer;
  typedef itk::ImageRegion<2>           RegionType;

  // affine transform
  typedef Superclass::AffineTransformType      AffineTransformType;
  typedef AffineTransformType::InputPointType  PointType;
  typedef AffineTransformType::InputVectorType VectorType;
  typedef Superclass::ColorType                ColorType;

  itkTypeMacro(RegionGlComponent, GlComponent);

  itkNewMacro(Self);

  virtual void  Render(const RegionType& /*extent*/, const AffineTransformType * space2ScreenTransform)
  {
    PointType ip1, ip2, sp1, sp2;

    // Get the input region points
    ip1[0] = m_Region.GetIndex()[0] + 1;
    ip1[1] = m_Region.GetIndex()[1] + 1;
    ip2[0] = m_Region.GetIndex()[0] + m_Region.GetSize()[0] - 1;
    ip2[1] = m_Region.GetIndex()[1] + m_Region.GetSize()[1] - 1;

    // Convert to screen points
    sp1 = space2ScreenTransform->TransformPoint(ip1);
    sp2 = space2ScreenTransform->TransformPoint(ip2);

    // draw the box
    glEnable(GL_BLEND);
    glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
    glColor4d(m_Color[0], m_Color[1], m_Color[2], m_Color[3]);

    glBegin(GL_LINE_LOOP);
    glVertex2d(sp1[0], sp1[1]);
    glVertex2d(sp1[0], sp2[1]);
    glVertex2d(sp2[0], sp2[1]);
    glVertex2d(sp2[0], sp1[1]);
    glEnd();

    glDisable(GL_BLEND);
  }

  itkSetMacro(Region, RegionType);
  itkGetConstReferenceMacro(Region, RegionType);

  itkSetMacro(Color, ColorType);
  itkGetConstReferenceMacro(Color, ColorType);

protected:
  RegionGlComponent() : m_Region(), m_Color()
  {
    m_Color.Fill(0);
    m_Color[0] = 1.;
    m_Color[3] = 1.;
  }
  virtual ~RegionGlComponent(){}
  void PrintSelf(std::ostream& os, itk::Indent indent) const
  {
    Superclass::PrintSelf(os, indent);
  }

private:
  RegionGlComponent(const Self&);     // purposely not implemented
  void operator =(const Self&); // purposely not implemented

  // The region to render
  RegionType m_Region;

  // The color of the region to render
  ColorType m_Color;

}; // end class
} // end namespace otb

#endif