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Help => Graphics => Topic started by: ceeplusplus on April 01, 2020, 11:03:25 pm

Title: Draw shape function
Post by: ceeplusplus on April 01, 2020, 11:03:25 pm

I have this chunk of code that draws a square:

RectangleShape rect (Vector2f(100.f, 100.f));
rect.setFillColor(Color(100, 50, 200));
rect.setPosition(50.f, 50.f);
window.draw(rect);

I want to have some kind of function/class that does this.  The problem I'm having is that when I put this into a function, it doesn't work anymore, because the "window" object is declared inside of main{}.  Is there a way I can pass in the renderwindow from main{} to a function?

full code:

(click to show/hide)

#include <SFML/Graphics.hpp>

using namespace sf;

int main()
{
    // create the window
    RenderWindow window(VideoMode(800, 600), "My window");

    // run the program as long as the window is open
    while (window.isOpen())
    {
        // check all the window's events that were triggered since the last iteration of the loop
        Event event;
        while (window.pollEvent(event))
        {
            // "close requested" event: we close the window
            if (event.type == Event::Closed)
                window.close();
        }

        // clear the window with black color
        window.clear(Color::Black);

        // draw everything here...
        // window.draw(...);

        RectangleShape rect (Vector2f(100.f, 100.f));
        rect.setFillColor(Color(100, 50, 200));
        rect.setPosition(50.f, 50.f);
        window.draw(rect);

        // end the current frame
        window.display();
    }

    return 0;
}

 

p.s. i'm very new to cpp development, i might be asking the wrong question

Title: Re: Draw shape function
Post by: Hapax on April 02, 2020, 07:24:04 pm

Pass the window by reference (or pointer) to the function.

This is a C++ question more than an SFML one but I shall endeavour to give you a simple example, based on your code, passing by reference:

Function declaration:

void drawRectangle(const sf::RenderWindow& window)
{
    sf::RectangleShape rect (Vector2f(100.f, 100.f));
    rect.setFillColor(Color(100, 50, 200));
    rect.setPosition(50.f, 50.f);
    window.draw(rect);
}

Function call:

drawRectangle(window);