ExampleChessboard.cpp

Example for drawing a chessboard in an image

Author

MIP

/* 
This file is part of the BIAS library (Basic ImageAlgorithmS).

Copyright (C) 2003-2009    (see file CONTACT for details)
  Multimediale Systeme der Informationsverarbeitung
  Institut fuer Informatik
  Christian-Albrechts-Universitaet Kiel


BIAS is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.

BIAS is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License
along with BIAS; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/


/**
   @example ExampleChessboard.cpp
   @brief Example for drawing a chessboard in an image
   @ingroup g_examples
   @author MIP  
*/

// must be first:
//#include <Base/Common/LeakChecking.h> 

#include <iostream>
#include <Base/Image/ImageBase.hh>
#include <Base/Image/ImageConvert.hh>
#include <Base/Image/ImageIO.hh>

using namespace BIAS;
using namespace std;

int main()
{
  unsigned int size=2048;
  Image<unsigned char> im(size, size, 1);
  unsigned int chess_field_size=128;
  unsigned int x=0, y=0, c=0, r=0;
  unsigned char color=0;
  unsigned char **ida=im.GetImageDataArray();

  

  for (y=chess_field_size; y<=im.GetHeight(); y+=chess_field_size){
    for (x=chess_field_size; x<=im.GetHeight(); x+=chess_field_size){
      if (y==chess_field_size)
        color = (color==0) ? (unsigned char)255 : (unsigned char)0;
      else
        color = (ida[y-chess_field_size-1][x-1]==0) ? 
          (unsigned char)255 : (unsigned char)0;
      for (r=1; r<=chess_field_size; r++){
        for (c=1; c<=chess_field_size; c++){
          ida[y-r][x-c]=color;
        }
      }
    }
  }
  
  //if (ImageIO::Save("chessboard", im)!=0){
  if (ImageIO::Save("chessboard", im)!=0){
    BIASERR("error writing image ");
    return -2;
  }

  if (ImageIO::Save("chessboard", im, ImageIO::FF_ppm)!=0){
    BIASERR("error exporting image ");
    return -2;
  }

  return 0;
}