SFML community forums

Help => Graphics => Topic started by: ravenheart on September 22, 2008, 07:10:28 pm

Title: Moving Objects
Post by: ravenheart on September 22, 2008, 07:10:28 pm

Hi i want a shape to move when up / down is pressed

Code: [Select]


if ((Event.Type == Event.KeyPressed) && (Event.Key.Code == Key::Up))
        {
            Polygon.Move(0,-5);
            //Polygon.Rotate(15);
        }
        if ((Event.Type == Event.KeyPressed) && (Event.Key.Code == Key::Down))
        {
            Polygon.Move(0,5);
            //Polygon.Rotate(15);
        }


but it flickers how can i make it move smoothly?

Title: Moving Objects
Post by: coral on September 22, 2008, 07:48:22 pm

Read the tutorial, use the predefined functions like this to set a bool:

    bool         LeftKeyDown     = Input.IsKeyDown(sf::Key::Left);
    bool         RightKeyDown     = Input.IsKeyDown(sf::Key::Right);
    bool         UpKeyDown     = Input.IsKeyDown(sf::Key::Up);
    bool         DownKeyDown     = Input.IsKeyDown(sf::Key::Down);

Then check against the bools instead!

Title: Moving Objects
Post by: ravenheart on September 23, 2008, 06:54:10 pm

why doesnt that work:

Input i;
bool down = i.IsKeyDown(Key::Down) ;

        if(down)
            Polygon.Move(0,-10);

Title: Moving Objects
Post by: Laurent on September 23, 2008, 07:07:29 pm

Probably because you didn't read the tutorial ;)

Title: Moving Objects
Post by: ravenheart on September 23, 2008, 07:17:08 pm

what tutorial are u talking about i cant find it

is this missing?
const sf::Input& Input = App.GetInput();

Title: Moving Objects
Post by: Laurent on September 23, 2008, 07:20:07 pm

This one :
http://www.sfml-dev.org/tutorials/1.3/window-events.php