TileLayer.h

/*
 * Gamedev Framework (gf)
 * Copyright (C) 2016-2019 Julien Bernard
 *
 * This software is provided 'as-is', without any express or implied
 * warranty.  In no event will the authors be held liable for any damages
 * arising from the use of this software.
 *
 * Permission is granted to anyone to use this software for any purpose,
 * including commercial applications, and to alter it and redistribute it
 * freely, subject to the following restrictions:
 *
 * 1. The origin of this software must not be misrepresented; you must not
 *    claim that you wrote the original software. If you use this software
 *    in a product, an acknowledgment in the product documentation would be
 *    appreciated but is not required.
 * 2. Altered source versions must be plainly marked as such, and must not be
 *    misrepresented as being the original software.
 * 3. This notice may not be removed or altered from any source distribution.
 */
#ifndef GF_TILE_LAYER_H
#define GF_TILE_LAYER_H

#include "Array2D.h"
#include "Flags.h"
#include "Flip.h"
#include "Portability.h"
#include "Stagger.h"
#include "Transformable.h"
#include "VertexArray.h"
#include "VertexBuffer.h"

namespace gf {
#ifndef DOXYGEN_SHOULD_SKIP_THIS
inline namespace v1 {
#endif

  class Texture;

  class GF_API TileLayer : public Transformable {
  public:
    static constexpr int NoTile = -1;

    enum Type {
      Orthogonal, 
      Staggered,  
    };

    TileLayer(Vector2u layerSize, Type type = Orthogonal);

    Vector2u getMapSize() const {
      return m_tiles.getSize();
    }

    void setTexture(const Texture& texture);

    const Texture& getTexture() const {
      return *m_texture;
    }

    bool hasTexture() const {
      return m_texture != nullptr;
    }

    void unsetTexture();

    void setTileSize(Vector2u tileSize);

    Vector2u getTileSize() const {
      return m_tileSize;
    }

    void setMargin(unsigned margin) {
      setMargin({ margin, margin });
    }

    void setMargin(Vector2u margin);

    Vector2u getMargin() const {
      return m_margin;
    }

    void setSpacing(unsigned spacing) {
      setSpacing({ spacing, spacing });
    }

    void setSpacing(Vector2u spacing);

    Vector2u getSpacing() const {
      return m_spacing;
    }

    void setBlockSize(Vector2u blockSize);

    Vector2u getBlockSize() const;

    void setTile(Vector2u position, int tile, Flags<Flip> flip = None);

    int getTile(Vector2u position) const;


    Flags<Flip> getFlip(Vector2u position) const;

    void clear();

    RectF getLocalBounds() const;

    void setAnchor(Anchor anchor);

    VertexBuffer commitGeometry() const;

    virtual void draw(RenderTarget& target, const RenderStates& states) override;

  private:
    struct Cell {
      int tile;
      Flags<Flip> flip;
    };

  private:
    void fillVertexArray(VertexArray& array, RectU rect) const;
    void updateGeometry();

  private:
    Type m_type;
    StaggerIndex m_staggerIndex;
    StaggerAxis m_staggerAxis;

    Vector2u m_layerSize;
    Vector2u m_blockSize;

    const Texture *m_texture;
    Vector2u m_tileSize;
    Vector2u m_margin;
    Vector2u m_spacing;

    Array2D<Cell> m_tiles;

    RectU m_rect;
    VertexArray m_vertices;
  };

#ifndef DOXYGEN_SHOULD_SKIP_THIS
}
#endif
}

#endif // GF_TILE_LAYER_H