Messages

31

Graphics / Afterimages while fast scrolling screen

« on: January 08, 2014, 12:38:38 pm »

While scrolling the game screen, it isn't clear because of afterimages.

It is not a serious problem but, I want to fix this.

I guess this problem related with double buffering.

I'm already using vertical sync, but it doesn't help to fix this problem.

I'm using sf::View to scroll the screen.

Here's some sample code.

// view.move(0.f, 1.f); // this works well
// view.move(0.f, 2.f); // this works well too
view.move(0.f, 3.f); // the problem happens here

window.clear();
window.setView(view);
window.draw();
window.display();
 

Thanks

32

Graphics / Sprite draw problem. or bug?

« on: December 31, 2013, 12:29:43 pm »

I found sometimes SFML draw a sprite incorrectly on a particular position or in some cases.

For example, this code can't draw a sprite correctly.

I tested it on SFML 2.1 stable version and latest version also.

Here is the source code and the result screen.

        sf::RenderWindow window(sf::VideoMode(800, 600), "Test", sf::Style::Close);

        sf::Texture texture;
        texture.loadFromFile("texture.png");

        sf::Sprite sprite(texture);
        sprite.setPosition(16.49849838f, 16.49849838f);

        sf::Sprite sprite2(texture);
        sprite2.setPosition(16.5f, 50.f);

        sf::Sprite sprite3(texture);
        sprite3.setPosition(16.f, 85.f);

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

                window.clear();
                window.draw(sprite);
                window.draw(sprite2);
                window.draw(sprite3);
                window.display();
        }
 

Only third one draw normally.

Actually it can avoid using just integer position.

But, when I draw an animation like this ( move(velocity * dt.asSeconds(); )

SFML will draw an incorrect image a while.

Also sf::Font looks have the same problem.

33

Graphics / Re: Change sprites color problem.

« on: November 29, 2013, 04:23:33 pm »

Thanks for replying so quickly.

but another problem is that the sprite has alpha channel.

so, white semi-transparent rectangle makes background also white.

how can I handle this issue?

34

Graphics / Change sprites color problem.

« on: November 29, 2013, 03:54:12 pm »

I'm trying to make short white blink effect as a result of collisions.

but I can't change sprite's color to white because white color is default color on sprite class.

so, is there any solution for this problem?

Thanks and I'm sorry for my poor English, I hope you understand my question.