field_of_view.h

/* Copyright (C) 2013-2014 Michal Brzozowski (rusolis@poczta.fm)

   This file is part of KeeperRL.

   KeeperRL 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 2
   of the License, or (at your option) any later version.

   KeeperRL 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/ . */

#pragma once

#include "util.h"

class Square;
class SquareArray;
class ContentFactory;

class FieldOfView {
  public:
  FieldOfView(Level*, VisionId, const ContentFactory*);
  bool canSee(Vec2 from, Vec2 to);
  const vector<SVec2>& getVisibleTiles(Vec2 from);
  void squareChanged(Vec2 pos);

  SERIALIZATION_DECL(FieldOfView)

  static constexpr int sightRange = 30;

  private:


  class Visibility {
    public:

    bool checkVisible(int x,int y) const;
    const vector<SVec2>& getVisibleTiles() const;

    Visibility(Rectangle bounds, const Table<bool>& blocking, int x, int y);

    SERIALIZATION_DECL(Visibility)

    private:
    array<bitset<sightRange * 2 + 1>, sightRange * 2 + 1> visible;
    vector<SVec2> SERIAL(visibleTiles);
    void setVisible(Rectangle bounds, int, int);

    int px;
    int py;
  };

  Level* SERIAL(level) = nullptr;
  Table<unique_ptr<Visibility>> visibility;
  VisionId SERIAL(vision);
  Table<bool> SERIAL(blocking);
};