Unity3D 动态显示场景跳转提示框

#pragma strict
//Author:Andy Sun
//Time:2013/4/16
//Function:Load a new scene


var newScene:String;//The Scene that will be Loaded
var sceneView:Texture2D;//The view image the loaded scene
private var firstPersonPlayer:GameObject;
private var label_width_Max:float;//The max width of the Label
private var label_height_Max:float;//The max height of the Label
private var label_width:float=0.0f;//The width of the Label
private var label_height:float=0.0f;//The height of the Label
private var showPrompt:boolean=false;
private var script:Follow_Load;//Get the Script Object
private var enter:boolean=false;//If the Player Enter the Trigger

function Start () {
     if(GameObject.FindWithTag("Manager")){
          firstPersonPlayer = GameObject.FindWithTag("Manager");
          script = firstPersonPlayer.GetComponent(Follow_Load);
     }
}

function Update () {
     label_width_Max = Screen.width/3;
     label_height_Max = Screen.height/3;
     if(label_width<label_width_Max && showPrompt){
          label_width += label_width_Max*0.05;
     }
     if(label_height<label_height_Max && showPrompt){
          label_height += label_height_Max*0.05;
     }
     if(!showPrompt && (label_width>0.0f)){
          label_width-=label_width_Max*0.05;
     }
     if(!showPrompt && (label_height>0.0f)){
          label_height-=label_height_Max*0.05;
     }
}

function OnGUI()
{
     //if the distance is less than 1.0f,show the prompt
     if(enter){
          showPrompt = true;
          GUI.DrawTexture(new Rect(Screen.width/2-label_width/2,Screen.height/2-label_height/2,label_width,label_height),sceneView,ScaleMode.StretchToFill,true,10.0f);
          if(GUI.Button(new Rect(Screen.width/2-label_width/6,Screen.height/2+label_height/2-label_height/5,label_width/3,label_height/10),"进入/"+""+newScene))
          {
               script.Load_Level(newScene);//Load a new Scene
            
          }
     }else{//if the distance is more than 5.0f,clear away the prompt
          showPrompt = false;
          GUI.DrawTexture(new Rect(Screen.width/2-label_width/2,Screen.height/2-label_height/2,label_width,label_height),sceneView,ScaleMode.StretchToFill,true,10.0f);
     }
}

function OnTriggerEnter (other : Collider) {
     enter=true;
}

function OnTriggerExit (other : Collider) {
    enter=false;
}