Unity开发Android程序，拖拽放大缩小物体

Vector2 m_screenpos = new Vector2(); // 记录手指触屏的位置

void Start () {

Input.multiTouchEnabled = true; // 允许多点触控

}

void Update () {

#if !UNITY_EDITOR && ( UNITY_IOS || UNITY_ANDROID )

MobileInput();

#else

DesktopInput();

#endif

}

// 桌面系统鼠标操作

void DesktopInput()

{

// 记录鼠标左键的移动距离

float mx = Input.GetAxis("Mouse X");

float my = Input.GetAxis("Mouse Y");

if ( mx!= 0 || my !=0 )

{

//松开鼠标左键

if (Input.GetMouseButton(0))

{

Camera.main.transform.Translate(new Vector3(mx*Time.deltaTime, my * Time.deltaTime, 0));

}

}

}

// 移动平台触屏操作

void MobileInput()

{

if (Input.touchCount <= 0)

return;

// 1个手指触摸屏幕

if (Input.touchCount == 1)

{

if (Input.touches[0].phase == TouchPhase.Began)

{

// 记录手指触屏的位置

m_screenpos = Input.touches[0].position;

}

// 手指移动

else if (Input.touches[0].phase == TouchPhase.Moved)

{

// 移动摄像机

Camera.main.transform.Translate(new Vector3(Input.touches[0].deltaPosition.x * Time.deltaTime, Input.touches[0].deltaPosition.y * Time.deltaTime, 0));

}

// 手指离开屏幕 判断移动方向

if (Input.touches[0].phase == TouchPhase.Ended &&

Input.touches[0].phase != TouchPhase.Canceled)

{

Vector2 pos = Input.touches[0].position;

// 手指水平移动

if (Mathf.Abs(m_screenpos.x - pos.x) > Mathf.Abs(m_screenpos.y - pos.y))

{

if (m_screenpos.x > pos.x){

//手指向左划动

}

else{

//手指向右划动

}

}

else // 手指垂直移动

{

if (m_screenpos.y > pos.y){

//手指向下划动

}

else{

//手指向上划动

}

}

}

}

else if ( Input.touchCount >1 )

{

// 记录两个手指的位置

Vector2 finger1 = new Vector2();

Vector2 finger2 = new Vector2();

// 记录两个手指的移动

Vector2 mov1 = new Vector2();

Vector2 mov2 = new Vector2();

for (int i=0; i<2; i++ )

{

Touch touch = Input.touches[i];

if (touch.phase == TouchPhase.Ended )

break;

if ( touch.phase == TouchPhase.Moved )

{

float mov = 0;

if (i == 0)

{

finger1 = touch.position;

mov1 = touch.deltaPosition;

}

else

{

finger2 = touch.position;

mov2 = touch.deltaPosition;

if (finger1.x > finger2.x)

{

mov = mov1.x;

}

else

{

mov = mov2.x;

}

if (finger1.y > finger2.y)

{

mov+= mov1.y;

}

else

{

mov+= mov2.y;

}

Camera.main.transform.Translate(0, 0, mov * Time.deltaTime);

}

}

}

}

}