examples/koch.cpp

#include <cstdlib>
#include <ctime>
#include <iostream>
#include <fstream>
#include <cmath>
#include <vector>
#include <utility>
#include "Board.h"
using namespace std;
using namespace LibBoard;

const double dy = 10;

int coordinate( int width ) {
  return 1 + (int) (width * (rand() / (RAND_MAX + 1.0)));
}

void Koch( ShapeList & board, const Color & color,
           Point p1, Point p2,
           int depth ) {
  if ( depth <= 0 ) return;

  Point v = p2 - p1;
  Point a = p1 + ( v / 3.0 );
  Point b = p1 + 2 * ( v / 3.0 );
  Point c = b.rotated( 60 * Board::Degree, a );

  Color col = color;

  col.setRGBi( static_cast<unsigned char>( std::floor( col.red() * 0.75 + 0.5 ) ),
               static_cast<unsigned char>( std::floor( col.green() * 0.75 + 0.5 ) ),
               static_cast<unsigned char>( std::floor( col.blue() * 0.75 + 0.5 ) ) );

  board << Triangle( a, c, b, Color::None, color, 0.0 );
  Koch( board, col, p1, a, depth-1 );
  Koch( board, col, a, c, depth-1 );
  Koch( board, col, c, b, depth-1 );
  Koch( board, col, b, p2, depth-1 );
}

int main( int , char *[] )
{
  Board board;
  board.clear( Color(200,255,200) );

  Point a( -10, 0 );
  Point c( 10, 0 );
  Point b = c.rotated( 60 * Board::Degree, a );

  Group aux;
  Koch( aux, Color::Green, a, b, 8 );
  Koch( aux, Color::Green, b, c, 8 );
  Koch( aux, Color::Green, c, a, 8 );
  aux << Triangle( a, b, c, Color::None, Color::Green, 0 );

  board << aux;

  int n = 4;
  while ( n-- ) {
    board.dup().last().scale( 0.5 );
    board.last()
      .translate( 0.25 * board.last().bbox().width,
                  board.last().bbox().height * 1.5 )
      .rotate( -20 * Board::Degree );
  }

  board << Line( board.bbox().left,
                 board.last().bbox().top - 1,
                 board.bbox().left + board.bbox().width,
                 board.last().bbox().top - 1,
                 Color::Blue, 1 );
  board << Text( -10, board.last().bbox().top + 0.3,
                 "LibBoard Koch's because LibBoard rocks...",
                 Fonts::Helvetica,
                 "NeverExists, 'Monotype Corsiva', Verdana, Arial",
                 24, Color::Blue );
  board.dup().last().rotate( -90 * Board::Degree ).translate( 0, -0.5 );

  board.saveFIG( "koch.fig", 200, 200 );
  board.saveSVG( "koch.svg", 300, 600 );
  board.saveEPS( "koch.eps", Board::A4 );
  exit(0);
}