Unity中用觸摸控制物體旋轉和放大

using UnityEngine;
using System.Collections;
using System.IO;

public class ScaleAndRotate : MonoBehaviour
{
private Touch oldTouch1; //上次觸摸點1(手指1)
private Touch oldTouch2; //上次觸摸點2(手指2)

void Start()
{

}

 

void Update () {

//沒有觸摸
if ( Input.touchCount <= 0 ){
return;
}

//單點觸摸， 水平上下旋轉
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);
}

//多點觸摸, 放大縮小
Touch newTouch1 = Input.GetTouch (0);
Touch newTouch2 = Input.GetTouch (1);

//第2點剛開始接觸屏幕, 只記錄，不做處理
if( newTouch2.phase == TouchPhase.Began ){
oldTouch2 = newTouch2;
oldTouch1 = newTouch1;
return;
}

//計算老的兩點距離和新的兩點間距離，變大要放大模型，變小要縮放模型
float oldDistance = Vector2.Distance(oldTouch1.position, oldTouch2.position);
float newDistance = Vector2.Distance(newTouch1.position, newTouch2.position);

//兩個距離之差，為正表示放大手勢， 為負表示縮小手勢
float offset = newDistance - oldDistance;

//放大因子， 一個像素按 0.01倍來算(100可調整)
float scaleFactor = offset / 100f;
Vector3 localScale = transform.localScale;
Vector3 scale = new Vector3(localScale.x + scaleFactor,
localScale.y + scaleFactor,
localScale.z + scaleFactor);

//最小縮放到 0.3 倍
if (scale.x > 0.3f && scale.y > 0.3f && scale.z > 0.3f) {
transform.localScale = scale;
}

//記住最新的觸摸點，下次使用
oldTouch1 = newTouch1;
oldTouch2 = newTouch2;
}

}