1 Vector2 oldPos1;//第一个手指
2 Vector2 oldPos2;//第二个手指
3
4 void Update()
5 {
6 //如果有2个手指
7 if (Input.touchCount == 2)
8 {
9 //如果第一个手指位置是移动的或者第二个手指位置是移动的
10 if (Input.GetTouch(0).phase == TouchPhase.Moved || Input.GetTouch(1).phase == TouchPhase.Moved)
11 {
12 Vector2 newPos1 = Input.GetTouch(0).position;
13 Vector2 newPos2 = Input.GetTouch(1).position;
14 if (isEnLarge(oldPos1, oldPos2, newPos1, newPos2))
15 {
16 float oldScale = transform.localScale.x;
17 float newScale = oldScale * 1.025f;
18 transform.localScale = new Vector3(newScale, newScale, newScale);
19
20 }
21 else
22 {
23 float oldScale = transform.localScale.x;
24 float newScale = oldScale / 1.025f;
25 transform.localScale = new Vector3(newScale, newScale, newScale);
26
27 }
28 oldPos1 = newPos1;
29 oldPos2 = newPos2;
30 }
31 }
32 }
33
34 //判断手势
35 bool isEnLarge(Vector2 oldP1, Vector2 oldP2, Vector2 newP1, Vector2 newP2)
36 {
37 float length1 = Mathf.Sqrt((oldP1.x - oldP2.x) * (oldP1.x - oldP2.x) + (oldP1.y - oldP2.y) * (oldP1.y - oldP2.y));
38 float length2 = Mathf.Sqrt((newP1.x - newP2.x) * (newP1.x - newP2.x) + (newP1.y - newP2.y) * (newP1.y - newP2.y));
39
40 //放大
41 if (length1 < length2)
42 {
43 return true;
44 }
45 //缩小
46 else
47 {
48 return false;
49 }
50 }
