Chip 2011 November/CHIP_2011_11.iso/Programy/Inne/Gry/Atomic_Tanks/Atomic-Tanks-5.1.exe/src/virtobj.cpp

C/C++ Source or Header | 2009-07-20 | 5KB | 213 lines

/*
 * atanks - obliterate each other with oversize weapons
 * Copyright (C) 2003  Thomas Hudson
 *
 * 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.
 * */

#include "virtobj.h"
#include "environment.h"



VIRTUAL_OBJECT::VIRTUAL_OBJECT()
    {
      _bitmap = NULL;
      _env = NULL;
      _global = NULL;
      x = 0;
      y = 0;
      xv = yv = 0;
      angle = 0;
      destroy = FALSE;
      age = 0;
      maxAge = -1;
      physics = 0;
      _current.x = 0;
      _current.y = 0;
      _current.w = 0;
      _current.h = 0;
      _old.x = 0;
      _old.y = 0;
      _old.w = 0;
      _old.h = 0;
    }




VIRTUAL_OBJECT::~VIRTUAL_OBJECT ()
      {
        _bitmap = NULL;
        // player, _env and _global must be handled by descendants!
      }



/** @brief update
  *
  * This method triggers an update of the canvas (aka drawing area) with the dimensions and position
  * of this object.
  */
void VIRTUAL_OBJECT::update()
{
  if (_requireUpdate)
    {
      int changed;

      if (_current.w)
        {
          if (_align == LEFT)
            {
              _env->make_update (_current.x, _current.y,
                                 _current.w, _current.h);
            }
          else if (_align == RIGHT)
            {
              _env->make_update (_current.x - _current.w,
                                 _current.y - _current.h,
                                 _current.w, _current.h);
            }
          else
            {
              _env->make_update (_current.x - (_current.w / 2),
                                 _current.y - (_current.h / 2),
                                 _current.w + 2, _current.h + 2);
            }
        }

      if ((_old.x == _current.x) &&
          (_old.y == _current.y) &&
          (_old.w == _current.w) &&
          (_old.h == _current.h))
        changed = FALSE;
      else
        changed = TRUE;

      if (changed)
        {
          if (_old.w)
            {
              if (_align == LEFT)
                {
                  _env->make_update (_old.x, _old.y,
                                     _old.w, _old.h);
                }
              else if (_align == RIGHT)
                {
                  _env->make_update (_old.x - _old.w,
                                     _old.y - _old.h,
                                     _old.w, _old.h);
                }
              else
                {
                  _env->make_update (_old.x - (_old.w / 2),
                                     _old.y - (_old.h / 2),
                                     _old.w + 2, _old.h + 2);
                }
            }
          _old.x = _current.x;
          _old.y = _current.y;
          _old.w = _current.w;
          _old.h = _current.h;
        }
      _requireUpdate = FALSE;
    }
}


void VIRTUAL_OBJECT::initialise ()
    {
      age = 0;
      maxAge = -1;
      x = 0;
      y = 0;
      xv = 0;
      yv = 0;
      destroy = false;
      _current.x = 0;
      _current.y = 0;
      _current.w = 0;
      _current.h = 0;
      _old.x = 0;
      _old.y = 0;
      _old.w = 0;
      _old.h = 0;
    }



int VIRTUAL_OBJECT::applyPhysics ()
    {
      x += xv;
      y += yv;

      return (0);
    }



void VIRTUAL_OBJECT::draw (BITMAP *dest)
    {
      if (!destroy)
        {
          rotate_sprite (dest, _bitmap,
                         (int)x - (_bitmap->w / 2),
                         (int)y - (_bitmap->h / 2),
                         itofix (angle));
          if (angle == 0)
            {
              setUpdateArea ((int)x - (_bitmap->w / 2 + 1),
                             (int)y - (_bitmap->h / 2 + 1),
                             _bitmap->w + 2, _bitmap->h + 2);
            }
          else
            {
              int length = MAX (_bitmap->w, _bitmap->h);
              length += MIN (_bitmap->w, _bitmap->h) / 2;
              setUpdateArea ((int)x - (length/2),
                             (int)y - (length/2),
                             length, length);
            }
          requireUpdate ();
        }
    }




void VIRTUAL_OBJECT::setUpdateArea (int left, int top, int width, int height)
    {
      _current.x = left;
      _current.y = top;
      _current.w = width;
      _current.h = height;
    }



void VIRTUAL_OBJECT::addUpdateArea (int left, int top, int width, int height)
    {
      if (left < _current.x)
        _current.x = left;
      if (top < _current.y)
        _current.y = top;
      if (left + width > _current.x + _current.w)
        _current.w = width;
      if (top + height > _current.y + _current.h)
        _current.h = height;
    }