5.2用摇杆控制物体的移动

ImageBG脚本

usingUnityEngine;

usingSystem.Collections;

usingUnityEngine.UI;

//不手动添加ScrollRect组件，让脚本继承与ScrollRect，从而获得ScrollRect的属性、方法

public class ScrollCricle:ScrollRect{

private float  mRadius;

private Vector3 offsetVector3=Vector3.zero;//摇杆的偏移

protected override void  Start( ){

base.Start( );

//计算摇杆移动半径

mRadius=(transform  as RectTransform).sizeDelta.x*0.5f;

}

voidUpdate( ){

CalculateOffect();

}

public override void OnDrag(UnityEngine.EventSystems.PointerEventData eventData){

//获得父类属性

base.OnDrag(eventData);

base.content.anchoredPosition=Vector3.ClampMagnitude(base.content.anchoredPosition,mRadius);

}

//计算偏移

privatevoidCalculateOffect( ){

//（-1，1）~（1，1）

offsetVector3=content.localPosition/mRadius;

}

public Vector3 GetoffsetVector3( ){

return offsetVector3;

}

}

被控制物体脚本

usingUnityEngine;

usingSystem.Collections;

usingSystem.Collections.Generic;

public class CubeMove:MonoBehaviour{

public ScrollCricle scrollCricle;//获得Scroll脚本

voidStart( ){

}

voidUpdate( ){

Vector3 offset=scrollCricle.GetoffsetVector3();

//物体的朝向随着摇杆的方向移动(四元数)

transform.rotation=Quaternion.LookRotation(new Vector3(offset.x,0,offset.y));

transform.position+=newVector3(offset.x,0,offset.y)*10*Time.deltaTime;

}

}