Messages

1

Window / Re: window.getDefaultView not updated after resize

« on: May 09, 2019, 03:03:04 pm »

Damn, I'm somehow managed to miss the "Showing more when the window is resized" section 

2

Window / Re: window.getDefaultView not updated after resize

« on: May 09, 2019, 06:49:26 am »

Hmmm, isn't it making it kinda useless?

3

Window / window.getDefaultView not updated after resize

« on: May 08, 2019, 09:35:03 pm »

Hello!

I'm probably doing something wrong, because I just started learning SFML and graphics, but here is the code to reproduce the issuse:

int main() {
        auto window = sf::RenderWindow(sf::VideoMode(1280, 540), "My window");
        window.setVerticalSyncEnabled(true);
        const float worldWidth = 960;
        const float worldHeight = 540;
        updateView(window, worldWidth, worldHeight, window.getSize().x, window.getSize().y);

        while (window.isOpen()) {

                sf::Event event{};
                while (window.pollEvent(event)) {
                        if (event.type == sf::Event::Closed) {
                                window.close();
                        }
                        if (event.type == sf::Event::Resized) {
                                updateView(window, worldWidth, worldHeight, event.size.width, event.size.height);
                        }
                }

                window.clear(sf::Color::Black);

                sf::RectangleShape viewArea(sf::Vector2f(worldWidth, worldHeight));
                viewArea.setPosition(0, 0);
                viewArea.setFillColor(sf::Color::Red);
                window.draw(viewArea);

                sf::Vector2i zeroPoint = window.mapCoordsToPixel(sf::Vector2f(0, 0));
                sf::RectangleShape viewAreaStart(sf::Vector2f(50.f, 50.f));
                viewAreaStart.setPosition(sf::Vector2f(zeroPoint.x, zeroPoint.y));
                viewAreaStart.setFillColor(sf::Color::White);

                sf::View view = window.getView();
                window.setView(window.getDefaultView());
                window.draw(viewAreaStart);
                window.setView(view);

                window.display();
        }
        return 0;
}
 

And here is updateView function, which should add spaces on the screen, to keep world aspect ratio:

void updateView(
        sf::RenderTarget& renderTarget,
        const float worldWidth,
        const float worldHeight,
        const float targetWidth,
        const float targetHeight
) {
        float worldAspectRatio = worldWidth / worldHeight;
        float screenAspectRatio = targetWidth / targetHeight;
        sf::FloatRect viewPort = sf::FloatRect(0, 0, 1.f, 1.f);
        if (screenAspectRatio < worldAspectRatio) {
                float widthRatio = targetWidth / worldWidth;
                float scaledWorldHeight = widthRatio * worldHeight;
                float heightDiff = targetHeight - scaledWorldHeight;
                float viewPortHeightOffset = heightDiff / 2 / targetHeight;
                viewPort.top = viewPortHeightOffset;
                viewPort.height = 1.f - viewPortHeightOffset * 2;
        } else {
                float heightRatio = targetHeight / worldHeight;
                float scaledWorldWidth = heightRatio * worldWidth;
                float widthDiff = targetWidth - scaledWorldWidth;
                float viewPortWidthOffset = widthDiff / 2 / targetWidth;
                viewPort.left = viewPortWidthOffset;
                viewPort.width = 1.f - viewPortWidthOffset * 2;
        }
        sf::View view(sf::FloatRect(0.f, 0.f, worldWidth, worldHeight));
        view.setViewport(viewPort);
        renderTarget.setView(view);
}
 

So in the beginning the white ractangle is located at the top left corner of the red rectangle. When I resize the window by adjusting it's width, the white rectangle starts shifting away from the corner, and if im not mistaken, the rectangle should stay in it`s place.

I can "fix" this behaviour by calculating default view myself, like this:

int main() {
        auto window = sf::RenderWindow(sf::VideoMode(1280, 540), "My window");
        sf::View defaultView(sf::FloatRect(0, 0, window.getSize().x, window.getSize().y));
        const float worldWidth = 960;
        const float worldHeight = 540;
        updateView(window, worldWidth, worldHeight, window.getSize().x, window.getSize().y);
        window.setVerticalSyncEnabled(true);

        while (window.isOpen()) {

                sf::Event event{};
                while (window.pollEvent(event)) {
                        if (event.type == sf::Event::Closed) {
                                window.close();
                        }
                        if (event.type == sf::Event::Resized) {
                                updateView(window, worldWidth, worldHeight, event.size.width, event.size.height);
                                defaultView.setSize(event.size.width, event.size.height);
                                defaultView.setCenter((float) event.size.width / 2, (float) event.size.height / 2);
                        }
                }

                window.clear(sf::Color::Black);

                sf::RectangleShape viewArea(sf::Vector2f(worldWidth, worldHeight));
                viewArea.setPosition(0, 0);
                viewArea.setFillColor(sf::Color::Red);
                window.draw(viewArea);

                sf::Vector2i zeroPoint = window.mapCoordsToPixel(sf::Vector2f(0, 0));
                sf::RectangleShape viewAreaStart(sf::Vector2f(100, 100));
                viewAreaStart.setPosition(sf::Vector2f(zeroPoint.x, zeroPoint.y));
                viewAreaStart.setFillColor(sf::Color::White);

                sf::View view = window.getView();
                window.setView(defaultView);
                window.draw(viewAreaStart);
                window.setView(view);

                window.display();
        }
        return 0;
}