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Graphics / Change movement direction?

« on: June 24, 2014, 05:17:46 pm »

Hi! =)

I´m programming a little game where a ball flies through the window and when it hits the end of the window it shall change its direction. Here´s the code I´m using for this:

void Ball::update(float frametime)
{
        if (pSpriteB->getPosition().y >= 9)
        {
                pSpriteB->move(-400 * frametime, -400 * frametime);
        }
        else if (pSpriteB->getPosition().y <= 9)
        {
                pSpriteB->move(400 * frametime, 400 * frametime);
        }
}

But when the ball hits the window´s end, it just stops and vibrates a bit. What I thought was that the previous movement is still active and I have to end up this previous movement so that the new movement direction can be done without errors, but I didn´t find anything to end up a movement.

What shall I do? Why isn´t it moving correctly? Please help!