walkregion.h

/* 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/>.
 *
 */

/*
 * This code is based on Broken Sword 2.5 engine
 *
 * Copyright (c) Malte Thiesen, Daniel Queteschiner and Michael Elsdoerfer
 *
 * Licensed under GNU GPL v2
 *
 */

#ifndef SWORD25_WALKREGION_H
#define SWORD25_WALKREGION_H

#include "common/array.h"
#include "sword25/kernel/common.h"
#include "sword25/math/region.h"

namespace Sword25 {

typedef Common::Array<Vertex> BS_Path;

class WalkRegion : public Region {
    friend class Region;

protected:
    WalkRegion();
    WalkRegion(InputPersistenceBlock &Reader, uint handle);

public:
    ~WalkRegion() override;

    bool init(const Polygon &contour, const Common::Array<Polygon> *pHoles = 0) override;

    bool queryPath(int x1, int y1, int x2, int y2, BS_Path &path) {
        return queryPath(Vertex(x1, y1), Vertex(x2, y2), path);
    }

    bool queryPath(Vertex startPoint, Vertex endPoint, BS_Path &path);

    void setPos(int x, int y) override;

    const Common::Array<Vertex> &getNodes() const {
        return _nodes;
    }
    const Common::Array< Common::Array<int> > &getVisibilityMatrix() const {
        return _visibilityMatrix;
    }

    bool persist(OutputPersistenceBlock &writer) override;
    bool unpersist(InputPersistenceBlock &reader) override;

private:
    Common::Array<Vertex> _nodes;
    Common::Array< Common::Array<int> > _visibilityMatrix;

    void initNodeVector();
    void computeVisibilityMatrix();
    bool checkAndPrepareStartAndEnd(Vertex &start, Vertex &end) const;
    bool findPath(const Vertex &start, const Vertex &end, BS_Path &path) const;
};

} // End of namespace Sword25

#endif