1 files changed, 81 insertions, 0 deletions
diff --git a/ksokoban/MoveSequence.cpp b/ksokoban/MoveSequence.cpp
new file mode 100644
index 00000000..b5a5c824
--- /dev/null
+++ b/ksokoban/MoveSequence.cpp
@@ -0,0 +1,81 @@
+/*
+ *  ksokoban - a Sokoban game for KDE
+ *  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_);
+  }
+}