unity3d 触屏多点触控（旋转与缩放）

Java代码

1. /*
2. Touch Orbit
3. Programmed by: Randal J. Phillips (Caliber Mengsk)
4. Original Creation Date: 12/16/2011
5. Last Updated: 12/16/2011
6. Desctiption: Simple orbit by one touch and drag, as well as pinch to zoom with two fingers.
7. */
10. var x:float;
12. var y:float;
14. var xSpeed:float;
16. var ySpeed:float;
18. var pinchSpeed:float;
20. var distance:float = 10;
22. var minimumDistance:float = 5;
24. var maximumDistance:float = 100;
26. private var touch:Touch;
28. private var lastDist:float =0;
30. private var curDist:float =0;
32. private var gameCamera:Camera;
34. function Start ()
36. {
38. gameCamera = Camera.mainCamera;
40. }
43. function Update ()
45. {
47. if (Input.GetKeyDown(KeyCode.Escape))
49. {
51. Application.Quit();
53. }
56. if (Input.touchCount == 1 && Input.GetTouch(0).phase == TouchPhase.Moved)
58. {
60. //One finger touch does orbit
62. touch = Input.GetTouch(0);
64. x += touch.deltaPosition.x * xSpeed * 0.02;
66. y -= touch.deltaPosition.y * ySpeed * 0.02;
68. }
70. if (Input.touchCount > 1 && (Input.GetTouch(0).phase == TouchPhase.Moved || Input.GetTouch(1).phase == TouchPhase.Moved))
72. {
74. //Two finger touch does pinch to zoom
76. var touch1 = Input.GetTouch(0);
78. var touch2 = Input.GetTouch(1);
80. curDist = Vector2.Distance(touch1.position, touch2.position);
82. if(curDist > lastDist)
84. {
86. distance += Vector2.Distance(touch1.deltaPosition, touch2.deltaPosition)*pinchSpeed/10;
88. }else{
90. distance -= Vector2.Distance(touch1.deltaPosition, touch2.deltaPosition)*pinchSpeed/10;
92. }
96. lastDist = curDist;
98. }
101. if(distance <= minimumDistance)
103. {
105. //minimum camera distance
107. distance = minimumDistance;
109. }
113. if(distance >= maximumDistance)
115. {
117. //maximum camera distance
119. distance = maximumDistance;
121. }
125. //Sets rotation
127. var rotation = Quaternion.Euler(y, x, 0);
131. //Sets zoom
133. var position = rotation * Vector3(0.0, 0.0, -distance) + Vector3(0,0,0);
137. //Applies rotation and position
139. transform.rotation = rotation;
141. transform.position = position;
143. }
147. function OnGUI()
149. {
151. //Simple output to display the distance from the center
153. GUI.Label(Rect(0,0,Screen.width, Screen.height),distance.ToString());
155. }