How do I calculate sides of an object?

Gday all,

Such a simple little thing, I thought. That's now been bugging me for a week. So clearly not so simple. Or staring me in the face. I don't know.

My problem:

I'm seeking a way to calculate the 'side' that one object is to relative to another object. The purpose is to calculate which side a target has been hit when another target shoots at it.

To illustrate:

So here, the green object has 'fired' at the red object (the target). It would be a right side hit.

I have had the system working in a few ways. Previously I just used 'within' and '90 degrees' while plugging in the angle between the two objects, and this seemed to work for calculating front and rear hits. But I need to bring in left and right sides as well, and I can't figure out how to do so. Again, I can calculate a static target, but this system also needs to take into account the rotation of the target.

Thoughts?

Can't you just use 'within' and '45 degrees' instead?

On impact simply compare the angle of bullet and target, eg:

( Bullet.Angle - Target.Angle ) is within 45 degrees of angle 180 = Front

( Bullet.Angle - Target.Angle ) is within 45 degrees of angle 270 = Left

( Bullet.Angle - Target.Angle ) is within 45 degrees of angle 90 = Right

( Bullet.Angle - Target.Angle ) is within 45 degrees of angle 0 = Rear

You might need to switch your left/right on that, but something similar should work.

Cheers! My issue was that I didn't even realise there was a base system angle within where I was only using an object's.

I used angle(target.X, target.Y, shooter.X, shooter.Y) instead of ( Bullet.Angle - Target.Angle ) since I wasn't sure how that ended with the value I needed, also simply by adding the target's angle onto the second angle I took into account the rotation of the target.