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Question by ROM · Jul 11, 2010 at 04:46 PM · iphonetouchcenteroriginiphoneinput

Degree from point?

I want to calculate the degree of a touch location away from the centre of my screen. Currently I have this code:

var myVector : Vector3; var myAngle : float;

 function Update () {
     if ( iPhoneInput.touchCount > 0 ){
         for(var touch : iPhoneTouch in iPhoneInput.touches) { 
                 myVector = new Vector3(240, 160, 0);
                 myAngle = Vector3.Angle(myVector, touch.position);  
         }
     } 
 }

The problem is that it doesn't really work. The degree's it comes up with are wrong and even if you do a full 360 loop around the point it doesn't exceed 50 at any point, does anyone have any idea why?

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Answer by Tetrad · Jul 11, 2010 at 08:01 PM

Daniel's answer is technically correct but will only give you 0-180 degrees.

If you want an angle that goes from -180-180 (i.e a full circle), you can use atan2.

I.e.

var myAngle : float;

function Update () { var midScreenPoint = new Vector2 (Screen.width 0.5, Screen.height 0.5); var dir = Vector3.Normalize (Input.mousePosition - midScreenPoint); myAngle = Mathf.Atan2( dir.y, dir.x ); // myAngle is in radians }

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Answer by Daniel 6 · Jul 11, 2010 at 05:52 PM

How's this work for you?

var myAngle : float;

function Update () { var midScreenPoint = new Vector2 (Screen.width 0.5, Screen.height 0.5); var dir = Vector3.Normalize (Input.mousePosition - midScreenPoint); myAngle = Vector3.Angle (Vector3.up, dir); }

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