Rotate object based on angle between two touch positions

Question

I've written a script that:

Detects the start and end position of a swipe gesture on the iPhone.
Positions a game object at the midpoint of the start and end of the swipe.
Resizes the game object based on the distance between the gesture points.

I'm having a lot of trouble determining the angle between the two gesture points and rotating the game object accordingly. I've included a sketch.!

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Answer 1

Best Answer

Answer by Jesse Anders · Nov 12, 2010 at 08:13 AM

You can compute the orientation using Atan2(), e.g. (untested C#-ish pseudocode):

Vector3 diff = p2 - p1;
float angle = Mathf.Atan2(diff.y, diff.x);
transform.rotation = Quaternion.Euler(0f, 0f, RadToDeg(angle));

Or by using Quaternion.LookRotation(), e.g.:

transform.rotation = Quaternion.LookRotation(p2 - p1, Vector3.forward);

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Corentin · Feb 17, 2014 at 08:52 PM 1

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Thanks for this answer ! For anybody finding this helpful, it's $$anonymous$$athf.Rad2Deg, and it's a constant, so the code should look like : Vector3 diff = p2 - p1; float angle = $$anonymous$$athf.Atan2(diff.y, diff.x); transform.rotation = Quaternion.Euler(0f, 0f, $$anonymous$$athf.Rad2Deg*angle);

Answer 2

Answer by saygon · Jul 28, 2012 at 12:44 AM

I spend 2 days, tried own solutions and other posts from this forums, but this answer working for me. Thanks a lot!

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Rotate object based on angle between two touch positions

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