// mower.cc/* ---------------------------------------------------------------The Lawnmower ProblemAn example for how to use gpc++ - The Genetic Programming KernelThis program is free software; you can redistribute it and/or modifyit under the terms of the GNU General Public License as published bythe Free Software Foundation; either version 1, or (at your option)any later version.This program is distributed in the hope that it will be useful, butWITHOUT ANY WARRANTY; without even the implied warranty ofMERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNUGeneral Public License for more details.You should have received a copy of the GNU General Public Licensealong with this program; if not, write to the Free SoftwareFoundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.Copyright 1996, 1997 Thomas WeinbrennerFor comments, improvements, additions (or even money !?) contact:Thomas WeinbrennerGrauensteinstr. 2635789 LaimbachGermanyE-mail: thomasw@emk.e-technik.th-darmstadt.deWWW:    http://www.emk.e-technik.th-darmstadt/~thomasw--------------------------------------------------------------- */#include "gp.h"#include "lawn.h"// Reset lawn and mower.  The lawn grows again, and the mower is// placed on the upper left corner facing south.void Mower::reset (){  for (int x=0; x<LawnHorizontal; x++)    for (int y=0; y<LawnVertical; y++)      lawn[x][y]=1;  mown=0;  direction=3;  pos=Vector (0, 0);}// Print a lawnostream& operator << (ostream &os, Mower &mower){  for (int y=0; y<LawnVertical; y++)    {      for (int x=0; x<LawnHorizontal; x++)	{	  // Mower position?	  if (mower.pos.x==x && mower.pos.y==y)	    os << 'M';	  else	    os << (mower.lawn[x][y] ? 'G' : '.');	}      os << '\n';    }  return os;}// Move from the current position to one which is the addition of new// argvoid Mower::frog (Vector& v){  // New position (vector addition!)  pos=pos+v;        // Mow the grass in the area in which you have moved....  mowArea ();}// Turn the mower leftvoid Mower::left (){  direction = (direction + 1) % 4;}// Move the mower forward and mow that areavoid Mower::mow (){  switch (direction)    {    case 0:      // East      pos.x = (pos.x + 1 ) % LawnHorizontal;      break;    case 1:      // North      pos.y = (pos.y + (LawnVertical-1) ) % LawnVertical;      break;    case 2:      // West      pos.x = (pos.x + (LawnHorizontal-1) ) % LawnHorizontal;      break;    case 3:      // South      pos.y = (pos.y + 1 ) % LawnVertical;      break;    default:      GPExitSystem ("Mower::mow", "Wrong switch statement");    }        // mow the grass in the area in which you have moved....  mowArea ();}// Mow the area at current mower positionvoid Mower::mowArea (){  // Count how many areas are mown already  mown+=lawn[pos.x][pos.y];    // Mow the grass in the area  lawn[pos.x][pos.y]=0;}