So I'm making a cannon that behaves pretty much exactly like the one in the "bullets" frame of the "testbed.mfa" file. The one thing I'm having trouble figuring out is how to position the bullet at the nose of the cannon so that it looks like it's being fired from the cannon. Line 32 in the Bullets frame of the testbed.mfa file is where the bullet gets positioned, but when I put it into my own game, it doesn't do anything.

Can someone help me understand what's going on in the example file with regard to positioning the bullet in the manner I described?