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engines/illusions/pathfinder.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 ILLUSIONS_PATHFINDER_H
+#define ILLUSIONS_PATHFINDER_H
+
+#include "illusions/graphics.h"
+#include "common/array.h"
+#include "common/list.h"
+#include "common/rect.h"
+
+namespace Illusions {
+
+struct PathLine {
+	Common::Point p0, p1;
+};
+
+typedef Common::Array<PathLine> PathLines;
+typedef Common::Array<Common::Point> PointArray;
+
+class PathFinder {
+public:
+	PointArray *findPath(Camera *camera, Common::Point sourcePt, Common::Point destPt,
+		PointArray *walkPoints, PathLines *walkRects, WidthHeight bgDimensions);
+protected:
+	PathLine _screenRect;
+	PointArray *_walkPoints;
+	PathLines *_walkRects;
+	WidthHeight _bgDimensions;
+	byte *_pathBytes;
+	PointArray *findPathInternal(Common::Point sourcePt, Common::Point destPt);
+	void postProcess(Common::Point sourcePt, PointArray *foundPath);
+	bool isLineBlocked(PathLine &line);
+	int calcLineDistance(PathLine &line);
+	bool findClosestPt(Common::Point &sourcePt, Common::Point &closestPt, Common::Point &destPt);
+	bool findValidDestLine(Common::Point &destPt);
+	void findValidDestPt(Common::Point &destPt);
+	WidthHeight calcRectDimensions(PathLine &rect);
+	void adjustRectDimensions(WidthHeight &dimensions);
+	void swapDimensions(WidthHeight &dimensions);
+	void clipLineToBg(Common::Point &destPt, WidthHeight &rectDimensions, PathLine &outDestLine);
+	void findDeltaPt(Common::Point pt, Common::Point &outDeltaPt);
+	bool isLineWithinRectangle(PathLine &line, PathLine &rect);
+	void swapLine(PathLine &line, PathLine &outLine);
+	int calcLineStatus(PathLine &sourceLine, PathLine &destRect, Common::Point *outPoint);
+};
+
+} // End of namespace Illusions
+
+#endif // ILLUSIONS_PATHFINDER_H