unity3d 触屏多点触控（旋转与缩放）
/*
Touch Orbit
Programmed by: Randal J. Phillips (Caliber Mengsk)
Original Creation Date: 12/16/2011
Last Updated: 12/16/2011
Desctiption: Simple orbit by one touch and drag, as well as pinch to zoom with two fingers.
*/
var x:float;
var y:float;
var xSpeed:float;
var ySpeed:float;
var pinchSpeed:float;
var distance:float = 10;
var minimumDistance:float = 5;
var maximumDistance:float = 100;
private var touch:Touch;
private var lastDist:float = 0;
private var curDist:float = 0;
private var gameCamera:Camera;
function Start ()
{
gameCamera = Camera.mainCamera;
}
function Update ()
{
if (Input.GetKeyDown(KeyCode.Escape))
{
Application.Quit();
}
if (Input.touchCount == 1 && Input.GetTouch(0).phase == TouchPhase.Moved)
{
//One finger touch does orbit
touch = Input.GetTouch(0);
x += touch.deltaPosition.x * xSpeed * 0.02;
y -= touch.deltaPosition.y * ySpeed * 0.02;
}
if (Input.touchCount > 1 && (Input.GetTouch(0).phase == TouchPhase.Moved || Input.GetTouch(1).phase == TouchPhase.Moved))
{
//Two finger touch does pinch to zoom
var touch1 = Input.GetTouch(0);
var touch2 = Input.GetTouch(1);
curDist = Vector2.Distance(touch1.position, touch2.position);
if(curDist > lastDist)
{
distance += Vector2.Distance(touch1.deltaPosition, touch2.deltaPosition)*pinchSpeed/10;
}else{
distance -= Vector2.Distance(touch1.deltaPosition, touch2.deltaPosition)*pinchSpeed/10;
}
lastDist = curDist;
}
if(distance <= minimumDistance)
{
//minimum camera distance
distance = minimumDistance;
}
if(distance >= maximumDistance)
{
//maximum camera distance
distance = maximumDistance;
}
//Sets rotation
var rotation = Quaternion.Euler(y, x, 0);
//Sets zoom
var position = rotation * Vector3(0.0, 0.0, -distance) + Vector3(0,0,0);
//Applies rotation and position
transform.rotation = rotation;
transform.position = position;
}
function OnGUI()
{
//Simple output to display the distance from the center
GUI.Label(Rect(0,0,Screen.width, Screen.height),distance.ToString());
}