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Question by Lisk · Dec 13, 2013 at 08:29 PM · anglevector

Facing angle of an object

Hi, I'd like to grab the facing angle of my unit object.

Let me illustrate:

alt text

Given the position of the blue character and the pink dot, I want to call some kind of function that will return 45.

Similarly, if the pink dot were placed below the blue character, I want the function to return 270. Et cetera for 180, 0, and 90 and all angles in between.

For context, I'm designing a mouse-movement system for my top-down game. I want to be able to access the 'facing' of the unit to determine what sprite/animation I should play. For example, if the unit is facing left, I want to play the 'left' animation.

angles.png (33.5 kB)
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Answer by robertbu · Dec 13, 2013 at 08:37 PM

Your numbers don't make sense. 180 should be opposite 0, and 270 opposite 90. If you want the angle starting with 0 on the right and going counter clockwise you can use:

 var v = pink.position - blue.position;
 var angle = Mathf.Atan2(v.y, v.x) * Mathf.Rad2Deg;

 3:00 will be 0.0.
 12:00 will be 90.0;
 9:00 will be 180.0;
 6:00 will be 270.0;
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avatar image Lisk · Dec 13, 2013 at 09:00 PM 0
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Perfect, thanks!

You're right, I'm not sure what I was thinking when I made that image. But I'm glad you were still able to understand what I was trying to ask.

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