Top of arc calculation?

richcoyrichcoy Member Posts: 211
edited April 2012 in Working with GS (Mac)
How would I determine if an actor is at the top of an arc?

For example, if launching a cannonball I would like to make an image change when the cannonball starts heading back down. I'm guessing it's a mathematical calculation.

Thanks.

Rich
Warning There was an error rendering this rich post.

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