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filterstatefulltrans.cpp

/**********************************************************************************
* Copyright (c) 2003, Christoph Rueegg <opendev@cdrnet.ch> and Matthias Bader     *
* All rights reserved.                                                            *
*                                                                                 *
* Project Website: http://www.cdrnet.net/projects/painter/                        *
*                                                                                 *
* Redistribution and use in source and binary forms, with or without modification,*
* are permitted provided that the following conditions are met:                   *
*                                                                                 *
* 1. Redistributions of source code must retain the above copyright notice,       *
* this list of conditions and the following disclaimer.                           *
*                                                                                 *
* 2. Redistributions in binary form must reproduce the above copyright notice,    *
* this list of conditions and the following disclaimer in the documentation       *
* and/or other materials provided with the distribution.                          *
*                                                                                 *
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"     *
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE       *
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE      *
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE        *
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR             *
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF            *
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS        *
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN         *
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)         *
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF          *
* THE POSSIBILITY OF SUCH DAMAGE.                                                 *
**********************************************************************************/

#include "filterstatefulltrans.h"
#include <cmath>

StatefullTransformationFilter::StatefullTransformationFilter() : ChannelFilter<unsigned char>()
{
  src = 0;
  active = false;
  x0 = y0 = 0;
}

StatefullTransformationFilter::~StatefullTransformationFilter()
{
  delete src;
}

void StatefullTransformationFilter::OnMouseEvent(const int button, const int state, int x, int y)
{
  if(button!=0)
  {
    return;
  }
  ChannelFilter<unsigned char>::Normalize(&x,&y);
  if(state == 0 && button == 0) //start
  {
    x0 = x;
    y0 = y;
    trg = ChannelFilter<unsigned char>::GetSubChannel();
    src = new Channel<unsigned char>(ChannelFilter<unsigned char>::GetHeight(),ChannelFilter<unsigned char>::GetWidth());
    for(int x1=0;x1<trg->GetWidth();x1++)
      for(int y1=0;y1<trg->GetHeight();y1++)
        src->Set(x1,y1,trg->Get(x1,y1));
    OnStart(src,trg,x0,y0);
    active = true;
  }
  if(state == 1 && button == 0) //end
  {
    active = false;
    OnEnd(src,trg,x0,y0,x,y);
    for(int x1=0;x1<trg->GetWidth();x1++)
      for(int y1=0;y1<trg->GetHeight();y1++)
        trg->Set(x1,y1,src->Get(x1,y1));
    delete src;
    src = 0;
  }
}

void StatefullTransformationFilter::OnMotionEvent(int x, int y)
{
  if(active)
  {
    ChannelFilter<unsigned char>::Normalize(&x,&y);
    OnRender(src,trg,x0,y0,x,y);
    x0 = x;
    y0 = y;
  }   
}

bool StatefullTransformationFilter::OnIdleEvent()
{
  if(active)
    return(OnRender(src,trg,x0,y0,x0,y0));
  else
    return(false);
}

void StatefullTransformationFilter::ResetChannel()
{
  if(active)
  {
    active = false;
    for(int x1=0;x1<trg->GetWidth();x1++)
      for(int y1=0;y1<trg->GetHeight();y1++)
        trg->Set(x1,y1,src->Get(x1,y1));
    delete src;
    src = 0;
  }
}

inline unsigned char StatefullTransformationFilter::Get(const int x, const int y)
{
  if(active && src != 0)
    return(src->Get(x,y));
  else
    return(ChannelFilter<unsigned char>::Get(x,y));
}

inline void StatefullTransformationFilter::Set(const int x, const int y, const unsigned char val)
{
  if(active && src != 0)
    src->Set(x,y,val);
  else
    ChannelFilter<unsigned char>::Set(x,y,val);;
}

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