/********************************************************************
**                Image Component Library (ICL)                    **
**                                                                 **
** Copyright (C) 2006-2013 CITEC, University of Bielefeld          **
**                         Neuroinformatics Group                  **
** Website: www.iclcv.org and                                      **
**          http://opensource.cit-ec.de/projects/icl               **
**                                                                 **
** File   : ICLQt/src/ICLQt/DragRectangleMouseHandler.cpp          **
** Module : ICLQt                                                  **
** Authors: Christof Elbrechter                                    **
**                                                                 **
**                                                                 **
** GNU LESSER GENERAL PUBLIC LICENSE                               **
** This file may be used under the terms of the GNU Lesser General **
** Public License version 3.0 as published by the                  **
**                                                                 **
** Free Software Foundation and appearing in the file LICENSE.LGPL **
** included in the packaging of this file.  Please review the      **
** following information to ensure the license requirements will   **
** be met: http://www.gnu.org/licenses/lgpl-3.0.txt                **
**                                                                 **
** The development of this software was supported by the           **
** Excellence Cluster EXC 277 Cognitive Interaction Technology.    **
** The Excellence Cluster EXC 277 is a grant of the Deutsche       **
** Forschungsgemeinschaft (DFG) in the context of the German       **
** Excellence Initiative.                                          **
**                                                                 **
********************************************************************/

#include <ICLQt/DragRectangleMouseHandler.h>
#include <ICLQt/DrawWidget.h>

using namespace icl::utils;
using namespace icl::core;

namespace icl{
  namespace qt{
  
    DragRectangleMouseHandler::DragRectangleMouseHandler(int minDim):
      m_minDim(minDim),m_edge(0,100,255,255),m_fill(0,0,0,0),m_outer(0,100,255,150),
      m_edgeWhileDrag(255,0,0,255),m_fillWhileDrag(0,0,0,0),m_outerWhileDrag(255,0,0,50){
    }
  
  
    void DragRectangleMouseHandler::process(const MouseEvent &e){
      Mutex::Locker l(*this);
      if(e.isRight()){
        m_rect = Rect::null;
        return;
      }
      if(e.isPressEvent()){
        m_origin  = e.getPos();
        m_curr   = e.getPos();
      }else if(e.isDragEvent()){
        m_curr   = e.getPos();
      }
      if(e.isReleaseEvent()){
        if(m_origin != m_curr){
          m_rect = Rect(m_origin, Size(m_curr.x-m_origin.x,m_curr.y-m_origin.y )).normalized();
          if(m_rect.getDim() < m_minDim) {
            m_rect = Rect::null;
          }
        }
        m_origin = m_curr =  Point::null;
      }
    }
    
    static void vis_rect(ICLDrawWidget &w, const Rect &r, int imagew, int imageh, 
                         const Color4D & edgeColor, const Color4D &fillColor, 
                         const Color4D & outerColor){
      w.color(edgeColor);
      w.fill(fillColor);
      w.rect(r);
      
      if(outerColor[3]>0){
        w.color(0,0,0,0);
        w.fill(outerColor);
        w.rect(0,0,r.x,imageh);
        w.rect(r.right(),0,imagew-r.right(),imageh);
        w.rect(r.x,r.bottom(),r.width,imageh-r.bottom());
        w.rect(r.x,0,r.width,r.y);
      }
    }
    
    void DragRectangleMouseHandler::visualize(ICLDrawWidget &w){
      const Size s = w.getImageSize();
      const int &imagew = s.width;
      const int &imageh = s.height;
      Mutex::Locker l(this);
      if(m_rect != Rect::null){
        vis_rect(w, m_rect, imagew, imageh, m_edge, m_fill, m_outer);
      }
      if(m_curr != Point::null || m_origin != Point::null){
        Rect r(m_origin, Size(m_curr.x-m_origin.x,m_curr.y-m_origin.y));
        vis_rect(w, r, imagew, imageh, m_edgeWhileDrag, m_fillWhileDrag, m_outerWhileDrag);
      }
    }
  
    bool DragRectangleMouseHandler::hasRect() const{
      Mutex::Locker l(this);
      return m_rect != Rect::null; 
    }
    bool DragRectangleMouseHandler::hasDraggedRect() const{
      Mutex::Locker l(this);
      return m_curr != Point::null || m_origin != Point::null;
    }
  
    Rect DragRectangleMouseHandler::getRect() const{
      Mutex::Locker l(this);
      return m_rect;
    }
  
    Rect DragRectangleMouseHandler::getDragggedRect() const{
      Mutex::Locker l(this);
      return Rect(m_origin, Size(m_curr.x-m_origin.x,m_curr.y-m_origin.y));
    }
  
  
  } // namespace qt
}