legend.hpp

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#ifndef LEGEND_HPP
#define LEGEND_HPP

#include <glm/vec2.hpp>
#include <glm/glm.hpp> 
#include <glm/gtx/epsilon.hpp>
#include <GL/glew.h>
#include <GLFW/glfw3.h>

#include "sceneObject.hpp"
#include "shader.hpp"
#include "texture.hpp"
#include "mouseSemantics.hpp"

#include <ft2build.h>
#include FT_FREETYPE_H

#define MOUSE_MIN_MOVE 0.3
#define MOUSE_MAX_MOVE 3.5
#define MOUSE_CUTOFF 200
#define STANDARD_TEXTSIZE 15.0f


struct Glyph {
    Glyph(FT_Pos _ax, FT_Pos _ay, unsigned int _bw, unsigned int _bh, FT_Int _bl, FT_Int _bt) {
        ax = _ax;
        ay = _ay;
        bw = _bw;
        bh = _bh;
        bl = _bl;
        bt = _bt;
    }

    FT_Pos ax;
    FT_Pos ay;
    unsigned int bw;
    unsigned int bh;
    FT_Int bl;
    FT_Int bt;
};


class LegendBackground : public SceneObject {
private:
    GLuint hudTex;
    GLuint vboPositions;
    Texture *texture;

public:
    LegendBackground(Scene *_scene, Texture *_texture);
    virtual ~LegendBackground();

    void draw();
    void setShader(Shader *_shader);
    void renderBackground(float x, float y, float sx, float sy);
};


class Legend : public SceneObject {
private:

    //Text, HUD alignment
    float upperleftx;
    float upperlefty;
    float ystep;
    float xstep;
    float xreset;
    float yreset;
    float maxXposText;
    float maxYposText;
    float offsetX;
    float offsetY;

    std::string selectorText;

    //Engine
    glm::vec2 latestPos;
    GLFWwindow *window;
    MouseSemantics *mouse;
    LegendBackground *background;
    int frameCount;
    double accumulatedTime;
    int FPS;

    //Font
    FT_Library ft;
    FT_Face face;

    //Opengl
    std::map<char, GLuint> charTexHandleMap;
    std::map<char, Glyph> charGlyphMap;
    GLuint vboPositions;
    Texture *texture;

    float calculateScaleFactor();
    void renderText(const char *text, float x, float y, float sx, float sy);
    void updatePosition(bool reset);
    void calcFPS(double deltaT);

public:
    Legend(Scene* _scene, MouseSemantics *_mouse, Texture *_texture, float upperleftx, float upperlefty, float xstep, float ystep);
    virtual ~Legend();

    void setShader(Shader *shader);
    void draw();
    void update(double deltaT);

    void prepareText();
    void setActiveSelector(std::string _sText) { selectorText = _sText; }
};

#endif //LEGEND_HPP