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engines/startrek/iwfile.h

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+/* ScummVM - Graphic Adventure Engine
+ *
+ * ScummVM is the legal property of its developers, whose names
+ * are too numerous to list here. Please refer to the COPYRIGHT
+ * file distributed with this source distribution.
+ *
+ * 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 3 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, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#ifndef STARTREK_IWFILE_H
+#define STARTREK_IWFILE_H
+
+#include "startrek/startrek.h"
+
+/**
+ * Files with the ".iw" extension define a set of "key points" through a room used for
+ * pathing. This is a basic interface for that.
+ */
+namespace StarTrek {
+
+const int MAX_KEY_POSITIONS = 32;
+
+class IWFile {
+public:
+	IWFile(StarTrekEngine *vm, const Common::String &filename);
+
+	int getNumEntries() {
+		return _numEntries;
+	}
+	/**
+	 * Returns the index of the nearest "key position" in the room that an object can walk to
+	 * (in a straight line) from a given position.
+	 */
+	int getClosestKeyPosition(int16 x, int16 y);
+
+	///< List of "key positions" used for pathing.
+	Common::Point _keyPositions[MAX_KEY_POSITIONS];
+
+	///< _iwEntries[i][j] is the index of the next key position to move to, when one is
+	///   already at key position "i" and is trying to get to key position "j".
+	byte _iwEntries[MAX_KEY_POSITIONS][MAX_KEY_POSITIONS];
+
+private:
+	StarTrekEngine *_vm;
+
+	uint16 _numEntries;
+};
+
+} // End of namespace StarTrek
+
+#endif