unity3d 触屏多点触控（旋转与缩放）

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());

}