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engines/bladerunner/obstacles.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 BLADERUNNER_OBSTACLES_H
+#define BLADERUNNER_OBSTACLES_H
+
+#include "bladerunner/rect_float.h"
+#include "bladerunner/vector.h"
+
+namespace BladeRunner {
+
+class BladeRunnerEngine;
+class SaveFileReadStream;
+class SaveFileWriteStream;
+
+class Obstacles {
+	static const int kVertexCount        = 150;
+	static const int kPolygonCount       =  50;
+	static const int kPolygonVertexCount = 160;
+	static const int kMaxPathSize        = 500;
+
+	enum VertexType {
+		BOTTOM_LEFT,
+		TOP_LEFT,
+		TOP_RIGHT,
+		BOTTOM_RIGHT
+	};
+
+	struct LineSegment {
+		Vector2 start;
+		Vector2 end;
+	};
+
+	struct Polygon {
+		bool       isPresent;
+		int        verticeCount;
+		RectFloat  rect;
+		Vector2    vertices[kPolygonVertexCount];
+		VertexType vertexType[kPolygonVertexCount];
+
+		Polygon() : isPresent(false), verticeCount(0), vertexType()
+		{}
+	};
+
+	BladeRunnerEngine *_vm;
+
+	Polygon *_polygons;
+	Polygon *_polygonsBackup;
+	Vector2 *_path;
+	int      _pathSize;
+	int      _count;
+	bool     _backup;
+
+	static bool lineLineIntersection(LineSegment a, LineSegment b, Vector2 *intersectionPoint);
+	static bool linePolygonIntersection(LineSegment lineA, VertexType lineAType, Polygon *polyB, Vector2 *intersectionPoint, int *intersectionIndex, int pathLengthSinceLastIntersection);
+
+	bool mergePolygons(Polygon &polyA, Polygon &PolyB);
+
+public:
+	Obstacles(BladeRunnerEngine *vm);
+	~Obstacles();
+
+	void clear();
+	void add(RectFloat rect);
+	void add(float x0, float z0, float x1, float z1) { add(RectFloat(x0, z0, x1, z1)); }
+	int findEmptyPolygon() const;
+	static float getLength(float x0, float z0, float x1, float z1);
+	bool findNextWaypoint(const Vector3 &from, const Vector3 &to, Vector3 *next);
+
+	bool findIntersectionNearest(int polygonIndex, Vector2 from, Vector2 to,
+	                             int *outVertexIndex, float *outDistance, Vector2 *out) const;
+	bool findIntersectionFarthest(int polygonIndex, Vector2 from, Vector2 to,
+	                              int *outVertexIndex, float *outDistance, Vector2 *out) const;
+
+	float pathTotalDistance(const Vector2 *path, int pathSize, Vector2 from, Vector2 to) const;
+	bool findPolygonVerticeByXZ(int *polygonIndex, int *verticeIndex, int *verticeCount, float x, float z) const;
+	bool findPolygonVerticeByXZWithinTolerance(float x, float z, int *polygonIndex, int *verticeIndex, int startSearchFromPolygonIdx) const;
+
+	void clearPath();
+	int  buildNegativePath(int polyIndex, int vertStartIndex, Vector2 startPos, int vertEndIndex, Vector2 endPos, Vector2 *path, int pathCapacity, bool *pathBlocked);
+	int  buildPositivePath(int polyIndex, int vertStartIndex, Vector2 startPos, int vertEndIndex, Vector2 endPos, Vector2 *path, int pathCapacity, bool *pathBlocked);
+
+	bool verticesCanIntersect(int lineType0, int lineType1, float x0, float y0, float x1, float y1) const;
+	bool findFarthestAvailablePathVertex(Vector2 *path, int pathSize, Vector3 start, Vector3 *next) const;
+
+	void backup();
+	void restore();
+	void reset();
+
+	void draw();
+	void save(SaveFileWriteStream &f);
+	void load(SaveFileReadStream &f);
+};
+
+} // End of namespace BladeRunner
+
+#endif