using UnityEngine;
using System.Collections;public class TriggerPrefab : MonoBehaviour {private Vector3 _vec3TargetScreenSpace;// 目标物体的屏幕空间坐标  private Vector3 _vec3TargetWorldSpace;// 目标物体的世界空间坐标  private Transform _trans;// 目标物体的空间变换组件  private Vector3 _vec3MouseScreenSpace;// 鼠标的屏幕空间坐标  private Vector3 _vec3Offset;// 偏移  public Material defaultMaterial;public Material redMaterial;//声明从鼠标发出一条射线clickRay
    Ray clickRay;//声明clickRay与游戏物体的碰撞
    RaycastHit clickPoint;//声明clickRay与地面的碰撞
    RaycastHit posPoint;//设置地面层，我的地面层是第8层，所以是8。不会设置层的话请看下边的Tips。LayerMask mask = 1 << 8;void Awake() { _trans = transform; }void Start(){}void Update(){clickRay = Camera.main.ScreenPointToRay(Input.mousePosition);}Vector3 oldPosition;void OnMouseDown(){// 把目标物体的世界空间坐标转换到它自身的屏幕空间坐标   _vec3TargetScreenSpace = Camera.main.WorldToScreenPoint(_trans.position);// 存储鼠标的屏幕空间坐标（Z值使用目标物体的屏幕空间坐标）    _vec3MouseScreenSpace = new Vector3(Input.mousePosition.x, Input.mousePosition.y, _vec3TargetScreenSpace.z);// 计算目标物体与鼠标物体在世界空间中的偏移量    _vec3Offset = _trans.position - Camera.main.ScreenToWorldPoint(_vec3MouseScreenSpace);_vec3Offset.y = 0;//如果射线与物体相碰，则调用OnMouseDrag()oldPosition = _trans.position;if (Physics.Raycast(clickRay, out clickPoint)){OnMouseDrag();}}void OnMouseUp(){if (TriggerBool){transform.position = oldPosition;                       } }void OnMouseDrag(){//取射线与地面相碰的坐标，赋给mouseMove,再把mouseMove的x坐标和z坐标赋给物体，y坐标不变（因为是贴在地面上移动）Physics.Raycast(clickRay, out posPoint, Mathf.Infinity, mask.value);Vector3 mouseMove = posPoint.point;Vector3 move = (new Vector3(mouseMove.x, transform.position.y, mouseMove.z)) + _vec3Offset;Vector3 newMove = new Vector3();newMove.y = move.y;transform.position = move;return;}bool TriggerBool;void OnTriggerEnter(Collider other){TriggerBool = true;TintRed(TriggerBool);}void OnTriggerExit(Collider other){TriggerBool = false;TintRed(TriggerBool);}void TintRed(bool red){if (red){ renderer.material = redMaterial;}else{renderer.material = defaultMaterial;}}/*******
void OnMouseDrag()
{
//取射线与地面相碰的坐标，赋给mouseMove,再把mouseMove的x坐标和z坐标赋给物体，y坐标不变（因为是贴在地面上移动）
Physics.Raycast (clickRay ,out posPoint,Mathf.Infinity,mask.value);
Vector3 mouseMove=posPoint.point;
//令角色朝向行走方向
transform.LookAt(new Vector3 (mouseMove.x, transform.position.y, mouseMove.z));
transform.position = (new Vector3 (mouseMove.x, transform.position.y, mouseMove.z));
//播放行走动画，引号里改成你自己的动画名称
animation.CrossFade("walk");
return;
}void OnMouseUp()
{
//鼠标松开时回到待机悬停动画，引号里改成你自己的动画名称
animation.CrossFade ("idle");
return;
} * */
}