moving a ball over the window

[schuki]

Hi there,
for my studies I have to program a simple game. There for I chose "Break out" and sfml. I created a class ball and reset the position:

void Ball::ResetPosition(int windowWidth, int windowHeight)
{
        _moveToX = -1.f;
        _moveToY = -1.f;
        float distanceToGround = 10.f;
        float ballPositionX = windowWidth / 2.f;
        float ballPositionY = windowHeight - _paddleSize.y - distanceToGround - (_ball.getSize().y) - 4;
        _ball.setPosition(ballPositionX, ballPositionY);
}

For collision testing I don't want to move the ball randomly on the screen. There for I created to variables, the first one is for the movement direction to the x-axis and the second one for the y-axis.

My game thread calls from now on the function MoveBall:

void Ball::MoveBall()
{
        _ball.move(_moveToX, _moveToX);
}

The idea was the following... If I set the direction to -1,-1 the ball would move towards to the left corner of my window. If I change the direction to 1 and -1 it would move to the right side of the window.

My problem now is, that the ball doesn't behave like expected:

vector	direction
1, 1	down
-1, -1	left
-1, 1	left
1, -1	down

Is there something I wrong with my code? Or has the ball possibly a own coord system?

rgds
_schuki

[Jesper Juhl]

Perhaps my Bouncing ball example will help you

Edit:

My game thread ...

Ehh, why would you complicate such a simple thing with threads. My advice: stay far away from threads as long as you possibly can. They add more complexity than one would think.

[schuki]

it's not a thread like sf::Thread, it's just the while(window.isOpen()) loop =)

[eXpl0it3r]

That's the game/main loop, don't confuse terms.

I always wonder with uni projects, why do we have to solve your issues, when you (usually) get paid assistants from the uni?

[schuki]

haha  because they don't know how to solve the problem. I'll review my code and I'll have a look at the link you posted.

[Hapax]

You may want to consider not mixing up moveToX with moveToY