#include <SDL2/SDL.h>
#include <SDL2/SDL2_gfxPrimitives.h>
#include <cstdlib>

//globalis valtozok a rajzolo felulethez
  SDL_Window *window;
  SDL_Renderer *canvas;

class Shape {
  private:
    int x,y;
    unsigned color;
  public:
    Shape(int x, int y, unsigned color):x(x),y(y),color(color){}
    virtual ~Shape(){}
    virtual void draw() const =0;
    unsigned getColor()const{return color;}
    int getx()const{return x;}
    int gety()const{return y;}
};

class Rect : public Shape {
  private:
    int w,h;
  public:
    Rect(int x, int y, unsigned color, int w, int h):Shape(x,y,color),w(w),h(h){}
    void draw() const{rectangleColor(canvas,getx(),gety(),getx()+w,gety()+h,getColor());}
    int getw()const {return w;}
    int geth()const {return h;}
};

class OpaqueRect : public Rect {
  private:
    unsigned fill;
  public:
    OpaqueRect(int x, int y, unsigned color, int w, int h, unsigned fill):Rect(x,y,color,w,h),fill(fill){}
    void draw() const{boxColor(canvas,getx()+1,gety()+1,getx()+getw()-2,gety()+geth()-2,fill);
              Rect::draw();}
};

class Poly : public Shape {
  private:
    struct Point{int x,y;} *p;
    int n;
  public:
    Poly(int x, int y, unsigned color):Shape(x,y,color), p(NULL), n(0){}
    ~Poly(){delete[] p;}
    void draw() const{ int xx=getx(),yy=gety();
      for(int i=0;i<n;++i){lineColor(canvas,xx,yy,p[i].x,p[i].y,getColor());xx=p[i].x;yy=p[i].y;}
      lineColor(canvas,xx,yy,getx(),gety(),getColor());
    }
    void add_pt(int x, int y){Point *tmp=new Point[n+1];
      for(int i=0;i<n;++i)tmp[i]=p[i];
      tmp[n].x=x;tmp[n].y=y;delete[] p;p=tmp;++n;
    }
};

/* kulon fuggvenyekbe, hogy olvashatobb legyen */
void sdl_init(char const *felirat, int szeles, int magas, SDL_Window **pwindow, SDL_Renderer **prenderer);
void loop();

int main ( int argc, char** argv )
{
  sdl_init("SDL Draw", 440, 360, &window, &canvas);
  Shape *s[3];
  s[0]=new Rect(100,20,0xff0000ff,80,40);//x,y,c,w,h
  Poly*p=new Poly(80,300,0xff8000ff);p->add_pt(150,250);p->add_pt(130,220);s[1]=p;
  s[2]=new OpaqueRect(200,100,0xffffffff,100,250,0xff8080ff);//x,y,c,w,h,f
  for(int i=0;i<3;++i)
    s[i]->draw();
  // vegul, update renderer :)
  SDL_RenderPresent(canvas);
  loop();
  for(int i=0;i<3;++i)
    delete s[i];
  return 0;
}

void sdl_init(char const *felirat, int szeles, int magas, SDL_Window **pwindow, SDL_Renderer **prenderer) {
  if (SDL_Init(SDL_INIT_EVERYTHING) < 0) {
    SDL_Log("Nem indithato az SDL: %s", SDL_GetError());
    exit(1);
  }
  SDL_Window *window = SDL_CreateWindow(felirat, SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, szeles, magas, 0);
  if (window == NULL) {
    SDL_Log("Nem hozhato letre az ablak: %s", SDL_GetError());
    exit(1);
  }
  SDL_Renderer *canvas = SDL_CreateRenderer(window, -1, SDL_RENDERER_SOFTWARE);
  if (canvas == NULL) {
    SDL_Log("Nem hozhato letre a megjelenito: %s", SDL_GetError());
    exit(1);
  }
  SDL_RenderClear(canvas);

  *pwindow = window;
  *prenderer = canvas;
}

void loop(){
  bool done=false;
  while(!done) {
    // esemenyek
    SDL_Event event;
    SDL_WaitEvent(&event);
    switch (event.type) {
    // ablak X
    case SDL_QUIT:
      done = true;
      break;
    // gombnyomas
    case SDL_KEYDOWN:
      // exit ha ESCAPE lenyomva
      if (event.key.keysym.sym == SDLK_ESCAPE)
        done = true;
      break;
    } // switch
  } // eseményhurok
}