Unity Multi-Touch (zoom in, zoom out)

Used to bind reference object Var Target:transform;  Scaling factor var distance = 10.0;  Left and right sliding movement speed var xspeed = 250.0;  var yspeed = 120.0;  Scaling Limit factor var yminlimit =-20;  var ymaxlimit = 80;  Location of the camera var x = 0.0;  var y = 0.0;  Record the last time the phone touch location to determine whether the user is in the left or zoom out gesture private Var Oldposition1:vector2;    private Var Oldposition2:vector2;      Initialize game information set function Start () {var angles = transform.eulerangles;      x = Angles.y;        y = angles.x;  Make the rigid body isn't change rotation if (rigidbody) rigidbody.freezerotation = true; } function Update () {//To determine the number of touches is a single touch if (Input.touchcount = = 1) {//Touch type is mobile touch if (Input . Gettouch (0). phase==touchphase.moved) {//calculate x and Y positions based on touch points x + = Input.getaxis ("Mouse x") * x              Speed * 0.02;            Y-= Input.getaxis ("Mouse y") * yspeed * 0.02; }}//To determine the number of touches for multi-touch if (Input.touchcount >1) {//////Two finger touch type are mobile touch if (Input.gettouc H (0). phase==touchphase.moved| | Input.gettouch (1). phase==touchphase.moved) {//calculates the position of the current two-point Touch point var tempPosition1                  = Input.gettouch (0). Position;                  var tempPosition2 = Input.gettouch (1). Position;                       function returns true to enlarge, return false for narrowing if (Isenlarge (Oldposition1,oldposition2,tempposition1,tempposition2)) { Amplification factor of more than 3 is not allowed to continue to enlarge//The data here is adjusted according to the model in my project, you can modify if (dis                      Tance > 3) {distance-= 0.5; }}else {//shrink wash back after 18.5 is not allowed to continue shrinking//The data here is based on my project Model and adjust, you can modify if (distance < 18.5) {distance + =                      0.5;              }}//backup the position of last touch point, used to compare oldposition1=tempposition1; Oldposition2=temppoSition2;       }}}//function return True to zoom in, return false for Shrink function Isenlarge (OP1:VECTOR2,OP2:VECTOR2,NP1:VECTOR2,NP2:VECTOR2): boolean { The function passes the position of the last touch two points with the position of the touch two points to calculate the user's gesture Var leng1 =mathf.sqrt ((op1.x-op2.x) * (op1.x-op2.x) + (OP1.Y-OP2.Y) * (op1.y-op2.y      ));      var leng2 =mathf.sqrt ((np1.x-np2.x) * (np1.x-np2.x) + (NP1.Y-NP2.Y) * (NP1.Y-NP2.Y));      if (leng1<leng2) {//magnification gesture return true;      }else {//Zoom out gesture return false;                   }}//update method Once the call is completed enter here to calculate the location of the Reset camera function lateupdate () {//target is the box variable that we bound, scaling the rotation of the reference if (target) {          Reset the camera's position y = Clampangle (y, Yminlimit, ymaxlimit);          var rotation = Quaternion.euler (y, x, 0);            var position = rotation * VECTOR3 (0.0, 0.0,-distance) + target.position;          Transform.rotation = rotation;      Transform.position = position; }} static function Clampangle (Angle:float, Min:float, max:float) {if (Angle &Lt      -360) Angle + = 360;      if (angle > Angle)-= 360;  return Mathf.clamp (angle, Min, max);   }

Unity Multi-Touch (zoom in, zoom out)