otbChangeScaleActionHandler.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 __otbChangeScaleActionHandler_h
#define __otbChangeScaleActionHandler_h

#include "otbImageWidgetActionHandler.h"

namespace otb
{
template <class TModel, class TView, class TViewToUpdate=TView>
class ChangeScaleActionHandler
  : public ImageWidgetActionHandler
{
public:
  typedef ChangeScaleActionHandler      Self;
  typedef ImageWidgetActionHandler      Superclass;
  typedef itk::SmartPointer<Self>       Pointer;
  typedef itk::SmartPointer<const Self> ConstPointer;

  itkNewMacro(Self);

  itkTypeMacro(ChangeScaleActionHandler, ImageWidgetActionHandler);

  typedef TModel                         ModelType;
  typedef typename ModelType::Pointer    ModelPointerType;
  typedef typename ModelType::RegionType RegionType;

  typedef TView                      ViewType;
  typedef typename ViewType::Pointer ViewPointerType;
 
  typedef TViewToUpdate                      ViewToUpdateType;
  typedef typename ViewToUpdateType::Pointer ViewToUpdatePointerType;

  virtual bool HandleWidgetEvent(const std::string& widgetId, int event)
  {
    if (m_View.IsNotNull() && m_Model.IsNotNull() && this->GetIsActive())
      {
      if (widgetId == m_View->GetZoomWidget()->GetIdentifier()
          && event == FL_MOUSEWHEEL)
        {
        otbMsgDevMacro(
          << "ChangeScaleActionHandler::HandleWidgetEvent(): handling (" << widgetId << ", " << event << ")");
        // Get the mousewhell offset
        int dy = Fl::event_dy();

        // Compute new scale
        double newScale = m_View->GetZoomWidget()->GetIsotropicZoom() * vcl_pow(m_ScaleRatio, -dy);

        if (newScale >= 1.0 )
          {
          // compute the new size of the extracted region, if less than
          // 1 pixel dont allow the zoom
          double sizex = m_View->GetZoomWidget()->w() / newScale;
          double sizey = m_View->GetZoomWidget()->h() / newScale;

          if (sizex > 1. && sizey >1.)
            {
            m_View->GetZoomWidget()->SetIsotropicZoom(newScale);
            
            // If set, update the IsotropicZoom of the second view
            if(m_ViewToUpdate.IsNotNull())
              {
              m_ViewToUpdate->GetZoomWidget()->SetIsotropicZoom(newScale);
              }
            
            RegionType region = m_Model->GetScaledExtractRegion();
            
            typename RegionType::IndexType index = region.GetIndex();
            typename RegionType::SizeType size = region.GetSize();
            index[0] += size[0] / 2;
            index[1] += size[1] / 2;
            size[0] = static_cast<unsigned int>(m_View->GetZoomWidget()->w() / m_View->GetZoomWidget()->GetIsotropicZoom());
            size[1] = static_cast<unsigned int>(m_View->GetZoomWidget()->h() / m_View->GetZoomWidget()->GetIsotropicZoom());
            region.SetSize(size);
            m_Model->SetScaledExtractRegion(region);
            m_Model->SetScaledExtractRegionCenter(index);
            // Update the model
            m_Model->Update();
            }
          }
        return true;
        }
      }
    return false;
  }

  itkSetObjectMacro(View, ViewType);
  itkGetObjectMacro(View, ViewType);

  itkSetObjectMacro(ViewToUpdate, ViewToUpdateType);
  itkGetObjectMacro(ViewToUpdate, ViewToUpdateType);

  itkSetObjectMacro(Model, ModelType);
  itkGetObjectMacro(Model, ModelType);

  itkSetMacro(ScaleRatio, double);
  itkGetMacro(ScaleRatio, double);

protected:
  ChangeScaleActionHandler() : m_View(), m_Model(), m_ScaleRatio(1.25)
  {
    m_ViewToUpdate = NULL;
  }

  virtual ~ChangeScaleActionHandler(){}
  void PrintSelf(std::ostream& os, itk::Indent indent) const
  {
    Superclass::PrintSelf(os, indent);
  }

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

  // Pointer to the view
  ViewPointerType m_View;
  ViewToUpdatePointerType m_ViewToUpdate;

  // Pointer to the model
  ModelPointerType m_Model;

  double m_ScaleRatio;

}; // end class
} // end namespace otb
#endif