GUI 電腦戰機風格

using UnityEngine;
using System.Collections;

public class My_GUI : MonoBehaviour {
 public int HP=100;
 public float ENG_L=100;
 public float ENG_R=100;
 public float charge_L=0;
 public float charge_R=0;
 void Start () {}
 void Update () {
  if(ENG_L<0){
   if(charge_L<100){
    charge_L+=Time.deltaTime*8;
    charge_L=float.Parse(charge_L.ToString("#0.0"));
   }else{
    ENG_L=100;
    charge_L=0;
   }
  }else{
   if(ENG_L<100){
    ENG_L+=Time.deltaTime*3;
    ENG_L=float.Parse(ENG_L.ToString("#0.0"));
   }
  }
  
  if(ENG_R<0){
   if(charge_R<100){
    charge_R+=Time.deltaTime*8;
    charge_R=float.Parse(charge_R.ToString("#0.0"));
   }else{
    ENG_R=100;
    charge_R=0;
   }
  }else{
   if(ENG_R<100){
    ENG_R+=Time.deltaTime*3;
    ENG_R=float.Parse(ENG_R.ToString("#0.0"));
   }
  }
 }
 
 void OnGUI(){
  GUI.BeginGroup(new Rect (10,Screen.height-90,Screen.width/2-20,100));
  GUI.Box(new Rect (0, 0, HP*2, 25),"HP:"+HP);
  if(charge_L==0){
   GUI.color = Color.white;
   GUI.Box(new Rect (0, 30, ENG_L, 25),"");
   GUI.Box(new Rect (0, 30, 100, 25),"ENG:"+ENG_L+"%");
  }else{
   GUI.color = Color.red;
   GUI.Box(new Rect (0, 30, charge_L, 25),"");
   GUI.Box(new Rect (0, 30, 100, 25),"Charging"+charge_L+"%");
  }
  if(charge_R==0){
   GUI.color = Color.white;
   GUI.Box(new Rect (100, 30, ENG_R, 25),"");
   GUI.Box(new Rect (100, 30, 100, 25),"ENG:"+ENG_R+"%");
  }else{
   GUI.color = Color.red;
   GUI.Box(new Rect (100, 30, charge_R, 25),"");
   GUI.Box(new Rect (100, 30, 100, 25),"Charging"+charge_R+"%");
  }
  GUI.EndGroup();
 }
}