unity3d使用手势旋转缩放屏幕

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//速度

float speed = 1f;

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 Update()

{

//Input.touchCount触摸数量

if (Input.touchCount <= 0)

{

return;

}

//Input.GetTouch获取触摸

//TouchPhase.Moved被移动(手指在屏幕上移动)

if (Input.touchCount > 0 && Input.GetTouch(0).phase == TouchPhase.Moved)

{

Vector2 touchDeltaPosition = Input.GetTouch(0).deltaPosition;

transform.Rotate(0, -touchDeltaPosition.x * speed, 0);

//transform.Rotate(-touchDeltaPosition.x * speed,0, 0);

}

//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 > 3f && scale.y > 3f && scale.z > 3f)

{

transform.localScale = scale;

}

//记住最新的触摸点，下次使用

oldTouch1 = newTouch1;

oldTouch2 = newTouch2;

}