SDL2 Rectangles!!

[HenrikAET]

What is the best way to draw a rectangle on the screen?

///------------CLASS RECTANGLE-------------///
class Rectangle: public Shape{
protected:
	int x, y;
	int w, h;
public:
	void drawRectangle(SDL_Renderer*);
};

void Rectangle drawRectangle(SDL_Renderer* renderer){
    SDL_Rect r;
    r.x=x;
    r.y=y;
    r.w=w;
    r.h=h;
    SDL_RenderFillRect(renderer, &r);
}
///----------------------------------------/// 

It feels odd to make a new object of SDL_Rect every time I call this. Should I make it a private variable? Is there a function that just takes x, y, w, and h so this all could be avoided?

[Peter87]

Since x, y, w and h store the exact same information as a SDL_Rect you could remove x, y, w and h and instead let the Rectangle class contain a single data member of type SDL_Rect.

class Rectangle : public Shape {
protected:
	SDL_Rect r;
public:
	void drawRectangle(SDL_Renderer*);
};

void Rectangle::drawRectangle(SDL_Renderer* renderer) {
    SDL_RenderFillRect(renderer, &r);
}

[Peter87]

Another alternative is to let Rectangle inherit from SDL_Rect. This allows you use x, y, w and h as regular members as before, and you still don't need to create a new object to pass to SDL_RenderFillRect because you can pass the Rectangle object itself.

class Rectangle : public Shape, protected SDL_Rect {
public:
	void drawRectangle(SDL_Renderer*);
};

void Rectangle::drawRectangle(SDL_Renderer* renderer) {
    SDL_RenderFillRect(renderer, this);
}