draw_matrix.h

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// -*- c++ -*-
//*****************************************************************************
//*****************************************************************************

#ifndef polybori_groebner_draw_matrix_h_
#define polybori_groebner_draw_matrix_h_

// include basic definitions
#include "groebner_defs.h"

#ifdef PBORI_HAVE_GD
#include <stdio.h>
#include <gd.h>
#endif

#ifdef PBORI_HAVE_M4RI_PNG
#include <m4ri/io.h>
#include <stdexcept>
#endif

BEGIN_NAMESPACE_PBORIGB


inline void
draw_matrix(mzd_t* mat, const char* filename){

  if ((mat->ncols == 0) || (mat->nrows == 0)) {
    std::cerr << "0-dimensional matrix cannot be drawed, skipping "<< filename<<"" <<std::endl;
    return;
  }

#ifdef PBORI_HAVE_M4RI_PNG

  int err = mzd_to_png(mat, filename, 9, "Generated by PolyBoRi", 0);
  assert(err == 0);

  if (err)
    throw std::runtime_error("Error writing png");

#elif defined(PBORI_HAVE_GD)
  int i,r,c,j;
  c=mat->ncols;
  r=mat->nrows;
  gdImagePtr im = gdImageCreate(c, r) ;
  FILE * out = fopen(filename, "wb") ;
  int black = gdImageColorAllocate(im, 0, 0, 0) ;
  int white = gdImageColorAllocate(im, 255, 255, 255); 
  gdImageFilledRectangle(im, 0, 0, c-1, r-1, white) ;
  
  for(i=0;i<r;i++){
    for(j=0;j<c;j++){
      if (mzd_read_bit(mat, i, j))
        gdImageSetPixel(im, j, i, black );
    }
  }

  gdImagePng(im, out);
  gdImageDestroy(im);
  fclose(out);
  
#else
  std::cerr<<"warning: for drawing matrices compile with png support";
#endif

}

END_NAMESPACE_PBORIGB

#endif /* polybori_groebner_draw_matrix_h_ */

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