Board  0.9.2
examples/arithmetic.cpp
/*
* @file arithmetic.cpp
* @author Sebastien Fourey (GREYC)
*
* @brief Example that shows the usage of the Board library by
* illustating the arithmetic coding principle.
* <p>Files arithm.eps, arithm.fig and arithm.svg are created
* in the current directory.</p>
*
* This source code is part of the Board project, a C++ library whose
* purpose is to allow simple drawings in EPS, FIG or SVG files.
* Copyright (C) 2007 Sebastien Fourey <http://foureys.users.greyc.fr>
*/
#include "Board.h"
#include <cstdlib>
#include <iostream>
#include <fstream>
#include <cmath>
#include <cstring>
using namespace std;
using namespace LibBoard;
int main( int argc, char *argv[] )
{
Board board;
if ( argc == 2 && !strcmp(argv[1],"-h") ) {
cout << "Usage: arithmetic [word] \n\n"
" Where word has letters in {a, b, c, d, e}\n\n";
exit(0);
}
char the_string[1024];
secured_strncpy( the_string, "cccccccbb", 1024 );
if ( argc == 2 ) {
secured_strncpy( the_string, argv[1], 1024 );
}
// char letters[] = "abcde";
double proba[100] = { 0.2, 0.1, 0.6, 0.05, 0.05 };
double lefts[100] = { 0, 0.2, 0.3, 0.9, 0.95 };
Color colors[5] = { Color( 0, 0, 255 ),
Color( 0, 255, 0 ),
Color( 255, 0, 0 ),
Color( 0, 255, 255 ),
Color( 255, 255, 0 ) };
char *pc = the_string;
int h = 0;
double thickness = 0.5 / strlen( the_string );
board.drawRectangle( 0, 0, 1.0, 0.5 );
double left = 0;
double width = 1.0;
double w = 1.0;
double n = 1;
char str[20];
board.setLineWidth( 0.1 );
board.clear( Color( 230, 230, 230 ) );
while ( *pc ) {
int i = *pc - 'a';
left += width * lefts[ i ];
width *= proba[i];
board.setPenColorRGBi( 100, 100, 100 );
w /= 2.0;
n *= 2;
for ( int k = 0; k < n; k++ )
board.drawRectangle( k*w, -h * thickness, w, 0.9*thickness );
board.setPenColor( colors[ i ] );
board.drawRectangle( left, -h * thickness, width, 0.9*thickness );
secured_sprintf( str, 20, "%c", *pc );
board.drawText( (left + width/2.0 ), -(h+0.5) * thickness, str );
++h;
++pc;
}
// Draw the letters rectangles.
for ( int k = 0; k < 5; k++ ) {
board.setPenColor( colors[ k ] );
board.drawRectangle( lefts[k], thickness, proba[k], 0.9*thickness );
secured_sprintf( str, 20, "%c", 'a' + k );
//board.drawText( lefts[k] + proba[k]/2.0, 0.5*thickness, str );
}
board.save( "arithm.eps", Board::A4 );
board.save( "arithm.fig", Board::A4 );
board.save( "arithm.svg", Board::A4 );
exit(0);
}