CODEWITHSUNDEEP
c++sfml
Matthew
Matthew

Reputation: 267

Passing SFML RenderWindow to class

I'm afraid I've come to C++ from my limited Python experience. In Python I often use Tkinter to handle my GUI, and I can pass my 'canvas' or 'window' to other classes which store it and then can draw to the canvas / window having only passed it across once.

I'm looking to do the same with SFML and C++ but, so far, have only found solutions where my sf::RenderWindow must be passed to a method every time that method is called.

For example, I have a 'player' class that I'd like to hold the sprite of the player and move the sprite every time Player.move('up') is called, at the moment the solutions I've found say I have to use the following code (it may be slightly incorrect, I've just typed this out whilst on the train, but hopefully you get the picture):

Main.cpp

#include <SFML/Window.hpp>
#include <SFML/Graphics.hpp>
#include "Player.h"
int main()
{
    sf::RenderWindow window(sf::VideoMode(800, 600), "My Game");

    Player player(); //Nothing passed
    player.move(window, "up"); //Pass window every time
    player.move(window, "down");
    player.move(window, "left");
    return 0;
}

Player.cpp

Player::move(sf::RenderWindow& window, char direction){
    /*Code to move the sprite shall be on this line*/        
    window.draw(sprite);
}

I understand that passing the render-window window to a method isn't a huge hardship, but I feel like there must be a way to do it more like this:

Main.cpp

#include <SFML/Window.hpp>
#include <SFML/Graphics.hpp>
#include "Player.h"
int main(){
    sf::RenderWindow window(sf::VideoMode(800, 600), "My Game");

    Player player(window); //Pass window once.
    player.move("up"); // Relax knowing that everything is already handled.
    player.move("down");
    player.move("left");
    return 0;
}

Player.cpp

Player::Player(sf::RenderWindow& win_gui){
    window = win_gui;
}

Player::move(char direction){
    /*various case statements to move the sprite on this line*/        
    window.draw(sprite);
}

I'm either missing something huge or misunderstand completely. My guess is both. If it's possible in another language, why not C++?

Upvotes: 0

Views: 2590

Answers (1)

Lorence Hernandez
Lorence Hernandez

Reputation: 1189

You can inherit from sf::Drawable which contains a pure virtual draw() method.

class Player : public sf::Drawable
{
     protected:
          void draw(sf::RenderTarget& target, sf::RenderStates state) const
          {
               target.draw(sprite);
          }
};

while Player class becoming a sf::Drawable, you will be able to do this:

Player player;
window.draw(player);

thats also how entities are drawn in sfml like shapes, sprites, vertices etc.

Upvotes: 1

Related Questions