Messages

1

Graphics / Re: Texture.update doesn't work as expected

« on: February 07, 2023, 01:26:20 pm »

Hello,

Thanks for your answer !

I've tested it and you are totally right ! I was totally missing the point !

Thank you so much

2

Graphics / Texture.update doesn't work as expected

« on: February 06, 2023, 08:18:12 pm »

Hello everyone,

First of all please forgive my English as it is not my mother tongue 

I'm trying to conceive a very simple code to begin with SFML : displaying an image, then, after a click on it, setting the pixel clicked color in blue.

Unfortunately, when I click, nothing happens and I have no idea why. I've displayed the pixels values (RGB) in the CLI before and after the click, I see that the values are different (so the color has been modified) but the picture isn't modified. So I think that the problem comes from my use of the update fonction. I have read the documentation several times and I still don't know what I am doing wrong.

Thanks in advance for any help !

You can find my code below :

sf::Image fill_shape(int x, int y, sf::Image img){

    sf::Image new_image = img;
    new_image.setPixel(x, y, BLUE);
    return new_image;
}

int main()
{
    // Load an image file from a file
    sf::Texture texture;
    if (!texture.loadFromFile("image.jpg")){
        return EXIT_FAILURE;
    }
    sf::Sprite sprite(texture);

    int x = sprite.getTexture()->getSize().x * sprite.getScale().x;
    int y = sprite.getTexture()->getSize().y * sprite.getScale().y;
    sf::RenderWindow window(sf::VideoMode(x, y), "Image Filler");

    while (window.isOpen())
    {
        sf::Event event;
        while (window.pollEvent(event))
        {
            if (event.type == sf::Event::Closed){
                window.close();
            }
            else if (sf::Mouse::isButtonPressed(sf::Mouse::Left))
            {
                sf::Vector2i position = sf::Mouse::getPosition();
                int x = position.x;
                int y = position.y;
                sf::Image image = sprite.getTexture()->copyToImage();
                sf::Image new_image = fill_shape(x, y, image);
                texture.update(new_image);
                sprite.setTexture(texture);
            }
        }

        window.clear();
        window.draw(sprite);
        window.display();
    }

    return 0;
}