sliding-puzzle/board.h

#pragma once

#include <SFML/Graphics/RenderWindow.hpp>
#include <SFML/Graphics/RectangleShape.hpp>
#include <SFML/Graphics/VertexArray.hpp>
#include <SFML/Graphics/Texture.hpp>
#include <SFML/Graphics/Sprite.hpp>
#include <array>

using pos = std::pair<int, int>;

enum class DIRECTION
{
    UP,
    DOWN,
    RIGHT,
    LEFT,

    NONE
};

//////////////////////////////////

class Board
{
public:
    explicit Board();
    ~Board();

    bool init(const std::string& path, int splitting, const sf::RenderWindow& window);
    void draw(sf::RenderWindow& window);
    bool isWinCondition() const;

    void setCursorVisibility(bool visible);
    bool tryProcessDirection(const DIRECTION& direction);
    bool moveSelection(const DIRECTION& direction);
    bool swapOnSelection(const DIRECTION& direction);

    // Go to or leave from selection mode
    void onSelectionMode();

private:

    struct Cell
    {
        std::vector<Cell*>::size_type inital_index;
        std::vector<Cell*>::size_type current_index;
        sf::Sprite *sprite;
        static int side_length;
    };

    using Cells = std::vector<Cell*>;

    sf::RectangleShape rect_filling;
    sf::VertexArray rect_selection;
    Cells::size_type selection_index;

    Cells::size_type cells_on_width; // amount of cells on horizontal side of board
    Cells::size_type cells_on_height; // amount of cells on vertical side of board

    Cells vec_field;
    Cells::size_type solved_tiles; // amount of tiles placed on initial positions

    sf::Texture global_texture;
    bool on_selection;
    bool is_cursor_visible;

    void swapCells(Cells::size_type curr_index, Cells::size_type swap_index);

    // Draw selection cursor on given tile
    void setSelectionVertex(Cells::size_type index);

    void calculateBoardProperties(int splitting);

    void splitImageIntoTiles(int tile_length);

    void scaleImageToWindow(const sf::RenderWindow &window);
    float calculateScalingToWindow(const sf::RenderWindow &window) const;
    void scaleTiles(float scaling);
    std::pair<float, float> calculateTileShiftVector(Cells::size_type tile_index, int shift) const;

    void shuffleTiles();
};