Messages

1

Graphics / Re: How to extract Rotation And Scale from sf::Transform

« on: August 01, 2024, 12:02:49 pm »

Thanks man, it helped me alot. I was very confused with the coordinate system and this transformation matrix because I am new.

2

General / Re: New here, and a simple question

« on: July 25, 2024, 03:33:04 pm »

Actually its just because of framerate limit you set. You should really read the section "Controlling the framerate" of this documentation : https://www.sfml-dev.org/tutorials/2.6/window-window.php

However, I've made some improvements to the code. Maybe you should try it :

#include <SFML/Graphics.hpp>

int main()
{
    sf::VideoMode desktopMode = sf::VideoMode::getDesktopMode(); //Getting desktop mode of the screen (full screen size)

    sf::RenderWindow window(desktopMode, "Screensaver", sf::Style::Fullscreen);

    //setting some constants
    const float WIN_WIDTH = desktopMode.width;
    const float WIN_HEIGHT = desktopMode.height;

    sf::CircleShape shape(50.f);
    shape.setOrigin(50, 50);
    shape.setFillColor(sf::Color::Green);

    shape.setPosition(shape.getRadius(), WIN_HEIGHT / 2.f); //Ball starts from middle left of the screen

    /* To make movement independent of frame rate*/
    sf::Clock clock;
    float dt = 0;
    float multiplier = 60;

    float xVelocity = 5; //Ball will go forward in the start
    float yVelocity = -5; //Ball will go upward in the start

    sf::Event event; //Moved it out of game loop, because it was useless to move it in loop and creating it in each iteration

    while (window.isOpen())
    {  
        while (window.pollEvent(event))
        {
            if (event.type == sf::Event::Closed)
                window.close();
            else if (sf::Keyboard::isKeyPressed(sf::Keyboard::Escape)) window.close();
           
        }

        /*Point to remember is that, shapes origin is at its center, so we have to keep this in mind*/
        if (shape.getPosition().x < shape.getOrigin().x || shape.getPosition().x >= (WIN_WIDTH - shape.getOrigin().x)) {
            xVelocity = -xVelocity; //Some basic logic
        }

        if (shape.getPosition().y < shape.getOrigin().x  || shape.getPosition().y >= (WIN_HEIGHT - shape.getOrigin().y)) {
            yVelocity = -yVelocity;
        }

        dt = clock.restart().asSeconds(); //restarting clock on each frame recording time elapsed in the dt variable

        //Using move rather than setPosition
        shape.move(xVelocity * dt * multiplier, yVelocity * dt * multiplier);

        //Drawing stuff
        window.clear();
        window.draw(shape);
        window.display();
    }

    return 0;
}

3

Graphics / How to extract Rotation And Scale from sf::Transform

« on: July 24, 2024, 08:12:08 pm »

Context Of Question : https://stackoverflow.com/questions/78779882/updating-transformable-child-objects-in-a-class-derived-from-sftransformable?noredirect=1#comment138905586_78779882

So, is there any way to extract rotation and scale from sf::Transform class?