I think your code is increasing mDegree by 0.5 each frame, and mDegree is the amount that you're rotating your object each frame. So after 100 frames you're rotating by 50 degrees per frame. Eventually, you're rotating so fast that it's starting to slow down and reverse.

mDegree should be how much to rotate by this frame. It should not grow with time. What rotate() is doing is increase the rotation speed.

EDIT: Wait... I think I see what the others are seeing now. Is it possible that mOrigins and mPoints are actually the same thing?

FURTHER EDIT: What does this line do?

Point npoint = mPoints.get(i);

[/quote]

There are two lists of points inside the polygon class. The original points mOrigin and the current points mPoints. mPoints changes and mOrigin does not with the rotation.

That code takes the point i from mPoints and updates it.

The rotate method just applies the .5f to increase the degree... The speed never increases, its always .5f and mDegree is increased by that amount each update.

That code takes the point i from mPoints and updates it.

In case my previous post got skipped, you DON'T WANT to establish a "per frame" rate, as you can't necessarily control the varying length of time it takes to process each frame. Ex: your player is facing a wall that takes up 95% of their view and isn't moving. That frame only takes 2ms to process. Then they turn around, facing 2000 props, 12 animated enemies, and dozens of particle streams. That frame takes 17ms to process. Your triangle would be spinning like crazy at the 2ms/frame, and then slow down considerably at the 17ms/frame.

Rotate at a fixed time rate, not frame rate. That's why you want to use deltaTime, correctly, and why when you weren't bothering to use deltaTime it sped up and slowed down.

I don't think it's an issue with the frame rate. The only suspicious part in how the code in the first post handles the frames is that there is a call to drawBounding() inside of the loop that updates the state, which seems wrong. Either the update happens independently of the drawing or --if update() is responsible for drawing-- the drawing should only happen once, at the end of the function.


if(isActive()) {
rotate();
mBounding.rotate(mPosition.x, mPosition.y, mDegree);
drawBounding();
}