[freejumps]

So, I have some h/w where we're given a program of a bouncing ball. The ball bounces around in a window hitting the edges and bouncing off, and it also gradually increases in size randomly:

if (rand.nextDouble() < 0.1) ballSize++;

Pretty simple, I guess. The ballSize is an int set at 10, and it gradually gets bigger infinitely. We're supposed to cap it to an arbitrary number, and while I can manage to make it stop increasing at a certain int, I can't figure out how to reverse the operation and have it start counting back down. All I could think of something like:

if (ballSize == 100) ballSize--;

But obviously that won't keep making it decrease. Can anyone try and lead me to the right direction?

[macosxnerd101]

Think about using a boolean to trigger a decrease in size. When the ball hits size n, invert the boolean. Then based on the boolean's value, either add or subtract the changeInSize constant from the ballSize.

[baavgai]

I wouldn't use a boolean. Rather, I'd use a variable with the rate of change. The variable could start out at 1 and change to -1 at some point. The main loop would always be applying += change.

[freejumps]

Ahh using a boolean makes a lot of sense. Got it working perfectly now, thanks for the quick reply!

[macosxnerd101]

Glad I could help!