io/boards/dgtalBoard2D-4-colormaps.cpp

This example shows you how to use colormaps with Board2D streams. Note how we redefine the style of a specific mode for the drawable element.

visualization of resulting export.

 
#include <cmath>
#include <iostream>
#include "DGtal/base/Common.h"
#include "DGtal/io/boards/Board2D.h"
#include "DGtal/io/Color.h"
#include "DGtal/io/colormaps/GradientColorMap.h"
#include "DGtal/shapes/Shapes.h"
#include "DGtal/helpers/StdDefs.h"
 
using namespace std;
using namespace DGtal;
using namespace Z2i;
 
 
int main()
{
  trace.beginBlock ( "Example dgtalBoard2D-4-colormaps" );
 
  Point p1( -10, -7 );
  Point p2( 10, 7 );
  Domain domain( p1, p2 );
  Point c1( -5, -1 );
  Point c2( 5, 1 );
  DigitalSet shape_set( domain );
  Shapes<Domain>::addNorm1Ball( shape_set, c1, 5 );
  Shapes<Domain>::addNorm1Ball( shape_set, c2, 5 );
  shape_set.erase( c1 );
  shape_set.erase( c2 );
 
  // Creating colormap.
  GradientColorMap<int> cmap_grad( 0, 15 );
  cmap_grad.addColor( Color( 50, 50, 255 ) );
  cmap_grad.addColor( Color( 255, 0, 0 ) );
  cmap_grad.addColor( Color( 255, 255, 10 ) );
 
  // Creating board.
  Board2D board;
  board << SetMode( domain.className(), "Paving" )
  << domain
  << SetMode( p1.className(), "Paving" );
  // This is the name of the style for a Point in mode "Paving".
  string specificStyle =  p1.className() + "/Paving";
  for ( DigitalSet::ConstIterator it = shape_set.begin();
  it != shape_set.end();
  ++it )
    {
      unsigned int d = (unsigned int) ceil( ( *it - c1 ).norm() );
      // specific color depending on the distance to point c1.
      board << CustomStyle( specificStyle,
          new CustomColors( Color::Black,
                cmap_grad( d ) ) )
      << *it;
    }
  board.saveSVG( "dgtalBoard2D-4-colormaps.svg");
  board.saveEPS( "dgtalBoard2D-4-colormaps.eps");
  board.saveTikZ( "dgtalBoard2D-4-colormaps.tikz");
 
#ifdef WITH_CAIRO
  board.saveCairo("dgtalBoard2D-4-colormaps-cairo.pdf", Board2D::CairoPDF);
  board.saveCairo("dgtalBoard2D-4-colormaps-cairo.png", Board2D::CairoPNG);
  board.saveCairo("dgtalBoard2D-4-colormaps-cairo.ps", Board2D::CairoPS);
  board.saveCairo("dgtalBoard2D-4-colormaps-cairo.svg", Board2D::CairoSVG);
#endif
 
  trace.endBlock();
  return 0;
}
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