Zombie.cc

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/*
 *  Copyright (C) 2000-2001  The Exult Team
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */

#ifdef HAVE_CONFIG_H
#  include <config.h>
#endif


#include "Zombie.h"

/*
 *  Find path from source to destination.
 *
 *  Output: 1 if successful, else 0.
 */
int Zombie::NewPath(Tile_coord s, Tile_coord d, Pathfinder_client *)
{
  src = s;      // Store start, destination.
  dest = d;
  cur = s;      // Get current coords.
  sum = 0;      // Clear accumulator.
  long deltax = Tile_coord::delta(cur.tx, dest.tx);
  long deltay = Tile_coord::delta(cur.ty, dest.ty);
  if (!deltax && !deltay)   // Going nowhere?
    {
    major_distance = 0;
    return (0);
    }   
  unsigned int abs_deltax, abs_deltay;
  int x_dir, y_dir;
  if (deltay >= 0)    // Figure directions.
    {
    y_dir = 1;
    abs_deltay = deltay;
    }
  else
    {
    y_dir = -1;
    abs_deltay = -deltay;
    }
  if (deltax >= 0)
    {
    x_dir = 1;
    abs_deltax = deltax;
    }
  else
    {
    x_dir = -1;
    abs_deltax = -deltax;
    }
  if (abs_deltay >= abs_deltax) // Moving faster along y?
    {
    major_coord = &cur.ty;
    minor_coord = &cur.tx;
    major_dir = y_dir;
    minor_dir = x_dir;
    major_delta = abs_deltay;
    minor_delta = abs_deltax;
    }
  else        // Moving faster along x?
    {
    major_coord = &cur.tx;
    minor_coord = &cur.ty;
    major_dir = x_dir;
    minor_dir = y_dir;
    major_delta = abs_deltax;
    minor_delta = abs_deltay;
    }
  major_distance = major_delta; // How far to go.
  return (1);
}

/*
 *  Get next point on path to go to (in tile coords).
 *
 *  Output: 0 if all done.
 */
int Zombie::GetNextStep(Tile_coord& n, bool& done)
{
  if (major_distance <= 0)
    {
    done = true;
    return (0);
    }
          // Subtract from distance to go.
  major_distance -= major_frame_incr;
          // Accumulate change.
  sum += major_frame_incr * minor_delta;
          // Figure change in slower axis.
  int minor_frame_incr = sum/major_delta;
  sum = sum % major_delta;  // Remove what we used.
          // Update coords. within world.
  *major_coord += major_dir*major_frame_incr;
  *minor_coord += minor_dir*minor_frame_incr;
          // Watch for wrapping.
  *major_coord = (*major_coord + c_num_tiles)%c_num_tiles;
  *minor_coord = (*minor_coord + c_num_tiles)%c_num_tiles;
  n = cur;      // Return new tile.
          // ++++++For now, ignore tz.
  done = (major_distance <= 0); // Indicate if this is the last one.
  return (1);
}

/*
 *  Delete.
 */
Zombie::~Zombie
  (
  )
  {
  }

---