TileEngine.h

/*
 * Copyright 2010-2014 OpenXcom Developers.
 *
 * This file is part of OpenXcom.
 *
 * OpenXcom 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.
 *
 * OpenXcom 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 OpenXcom.  If not, see <http://www.gnu.org/licenses/>.
 */
#ifndef OPENXCOM_TILEENGINE_H
#define OPENXCOM_TILEENGINE_H

#include <vector>
#include "Position.h"
#include "../Ruleset/RuleItem.h"
#include <SDL.h>

namespace OpenXcom
{

class SavedBattleGame;
class BattleUnit;
class BattleItem;
class Tile;
struct BattleAction;

class TileEngine
{
private:
    static const int MAX_VIEW_DISTANCE = 20;
    static const int MAX_VOXEL_VIEW_DISTANCE = MAX_VIEW_DISTANCE * 16;
    static const int MAX_DARKNESS_TO_SEE_UNITS = 9;
    SavedBattleGame *_save;
    std::vector<Uint16> *_voxelData;
    static const int heightFromCenter[11];
    void addLight(const Position &center, int power, int layer);
    int blockage(Tile *tile, const int part, ItemDamageType type, int direction = -1, bool checkingFromOrigin = false);
    bool _personalLighting;
public:
    TileEngine(SavedBattleGame *save, std::vector<Uint16> *voxelData);
    ~TileEngine();
    void calculateSunShading();
    void calculateSunShading(Tile *tile);
    bool calculateFOV(BattleUnit *unit);
    void calculateFOV(const Position &position);
    bool checkReactionFire(BattleUnit *unit);
    void calculateTerrainLighting();
    void calculateUnitLighting();
    BattleUnit *hit(const Position &center, int power, ItemDamageType type, BattleUnit *unit);
    void explode(const Position &center, int power, ItemDamageType type, int maxRadius, BattleUnit *unit = 0);
    Tile *checkForTerrainExplosions();
    int unitOpensDoor(BattleUnit *unit, bool rClick = false, int dir = -1);
    int closeUfoDoors();
    int calculateLine(const Position& origin, const Position& target, bool storeTrajectory, std::vector<Position> *trajectory, BattleUnit *excludeUnit, bool doVoxelCheck = true, bool onlyVisible = false, BattleUnit *excludeAllBut = 0);
    int calculateParabola(const Position& origin, const Position& target, bool storeTrajectory, std::vector<Position> *trajectory, BattleUnit *excludeUnit, double curvature, const Position delta);
    Position getSightOriginVoxel(BattleUnit *currentUnit);
    bool visible(BattleUnit *currentUnit, Tile *tile);
    void togglePersonalLighting();
    int distance(const Position &pos1, const Position &pos2) const;
    int distanceSq(const Position &pos1, const Position &pos2, bool considerZ = true) const;
    int horizontalBlockage(Tile *startTile, Tile *endTile, ItemDamageType type);
    int verticalBlockage(Tile *startTile, Tile *endTile, ItemDamageType type);
    bool psiAttack(BattleAction *action);
    Tile *applyGravity(Tile *t);
    bool validMeleeRange(BattleUnit *attacker, BattleUnit *target, int dir);
    bool validMeleeRange(Position pos, int direction, BattleUnit *attacker, BattleUnit *target, Position *dest);
    int faceWindow(const Position &position);
    int checkVoxelExposure(Position *originVoxel, Tile *tile, BattleUnit *excludeUnit, BattleUnit *excludeAllBut);
    bool canTargetUnit(Position *originVoxel, Tile *tile, Position *scanVoxel, BattleUnit *excludeUnit, BattleUnit *potentialUnit = 0);
    bool canTargetTile(Position *originVoxel, Tile *tile, int part, Position *scanVoxel, BattleUnit *excludeUnit);
    int castedShade(const Position& voxel);
    bool isVoxelVisible(const Position& voxel);
    int voxelCheck(const Position& voxel, BattleUnit *excludeUnit, bool excludeAllUnits = false, bool onlyVisible = false, BattleUnit *excludeAllBut = 0);
    bool detonate(Tile* tile);
    bool validateThrow(BattleAction &action, Position originVoxel, Position targetVoxel, double *curve = 0, int *voxelType = 0);
    void checkAdjacentDoors(Position pos, int part);
    std::vector<BattleUnit *> getSpottingUnits(BattleUnit* unit);
    BattleUnit* getReactor(std::vector<BattleUnit *> spotters, BattleUnit *unit);
    bool canMakeSnap(BattleUnit *unit, BattleUnit *target);
    bool tryReactionSnap(BattleUnit *unit, BattleUnit *target);
    void recalculateFOV();
    int getDirectionTo(const Position &origin, const Position &target) const;
    Position getOriginVoxel(BattleAction &action, Tile *tile);
    void setDangerZone(Position pos, int radius, BattleUnit *unit);

};

}

#endif