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/*
* ksokoban - a Sokoban game for TDE
* Copyright (C) 1998 Anders Widell <d95-awi@nada.kth.se>
*
* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "MoveSequence.h"
#include "LevelMap.h"
#include "Move.h"
MoveSequence::MoveSequence (Move *_move, LevelMap *_map, bool _undo) {
assert (_move->finished_);
move_ = _move;
map_ = _map;
undo_ = _undo;
if (undo_) {
pos_ = move_->moveIndex_-2;
xDest_ = x_ = move_->moves_[move_->moveIndex_-1]&0x7f;
yDest_ = y_ = (move_->moves_[move_->moveIndex_-1]>>8)&0x7f;
} else {
pos_ = 1;
xDest_ = x_ = move_->moves_[0]&0x7f;
yDest_ = y_ = (move_->moves_[0]>>8)&0x7f;
}
newStep ();
}
bool
MoveSequence::newStep () {
if (pos_>=move_->moveIndex_ || pos_<0) return false;
xDest_ = move_->moves_[pos_]&0x7f;
yDest_ = (move_->moves_[pos_]>>8)&0x7f;
if (undo_) push_ = (move_->moves_[pos_+1]&0x80)==0x80;
else push_ = (move_->moves_[pos_]&0x80)==0x80;
xd_ = yd_ = 0;
if (xDest_ < x_) xd_ = -1;
if (xDest_ > x_) xd_ = 1;
if (yDest_ < y_) yd_ = -1;
if (yDest_ > y_) yd_ = 1;
if (undo_) pos_--;
else pos_++;
return true;
}
bool
MoveSequence::next () {
if (x_ == xDest_ && y_ == yDest_ && !newStep ()) return false;
x_ += xd_;
y_ += yd_;
if (undo_) {
if (push_) return map_->unpush (x_, y_);
else return map_->unstep (x_, y_);
} else {
if (push_) return map_->push (x_, y_);
else return map_->step (x_, y_);
}
}
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