using UnityEngine;

using System.Collections;

public class Gesture : MonoBehaviour {

private Touch oldTouch1;  //上次触摸点1(手指1)

private Touch oldTouch2;  //上次触摸点2(手指2)

void Start()

{

}

void Update () {

//没有触摸

if ( Input.touchCount <= 0 ){

return;

}

//单点触摸， 水平上下旋转

if( 1 == Input.touchCount )

{

Touch touch = Input.GetTouch (0);

Vector2 deltaPos = touch.deltaPosition;

transform.Rotate(Vector3.down  * deltaPos.x , Space.World);

transform.Rotate(Vector3.right * deltaPos.y , Space.World);

}

//多点触摸, 放大缩小

Touch newTouch1 = Input.GetTouch (0);

Touch newTouch2 = Input.GetTouch (1);

//第2点刚开始接触屏幕, 只记录，不做处理

if( newTouch2.phase == TouchPhase.Began ){

oldTouch2 = newTouch2;

oldTouch1 = newTouch1;

return;

}

//计算老的两点距离和新的两点间距离，变大要放大模型，变小要缩放模型

float oldDistance = Vector2.Distance(oldTouch1.position, oldTouch2.position);

float newDistance = Vector2.Distance(newTouch1.position, newTouch2.position);

//两个距离之差，为正表示放大手势， 为负表示缩小手势

float offset = newDistance - oldDistance;

//放大因子， 一个像素按 0.01倍来算(100可调整)

float scaleFactor = offset / 100f;

Vector3 localScale = transform.localScale;

Vector3 scale = new Vector3(localScale.x + scaleFactor,

localScale.y + scaleFactor,

localScale.z + scaleFactor);

//最小缩放到 0.3 倍

if (scale.x > 0.3f && scale.y > 0.3f && scale.z > 0.3f) {

transform.localScale = scale;

}

//记住最新的触摸点，下次使用

oldTouch1 = newTouch1;

oldTouch2 = newTouch2;

}

}

作者：FrozenSunset

链接：http://www.jianshu.com/p/ea096d137801

來源：简书

著作权归作者所有。商业转载请联系作者获得授权，非商业转载请注明出处。