using UnityEngine;
using System.Collections;

[AddComponentMenu("infinite camera-control/mouse orbit with zoom")]
public class MouseLookPlus : MonoBehaviour {
public Transform target;
   public float xSpeed = 12.0f;
   public float ySpeed = 12.0f;
   public float zoomMin = 1.0f;
   public float zoomMax = 20.0f;
   public float distance = 2;
   public float Ypos;
   float x = 0.0f;
   float y = 0.0f;
   bool isActivated;

   // Use this for initialization
   void Start () {
   Vector3 angles = Transform.eurlerAngles;
    x = angles.y;
    y = angles.x;
    position = - (transform.forward*distance) + target.position;
    transform.position = position;
    Ypos = transform.position.y;
      
   }
     
   // Update is called once per frame
   void LateUpdate () {
  if (Input.GetMouseButtonDown(1)){
    isActivated = true;
    }
    if (Input.GetMouseButtonUp (1))
    {
    isActivated = false;
       
    }
      
    if (target && isActivated) {
     x += Input.GetAxis("MouseX")*xSpeed;
     y -= Input.GetAxis("MouseY")*ySpeed;
     Transform.RotateAround(target.position,transform.up, x);
        Transform.RotateAround(target.position,transform.right, y);
     Transform.rotation = Quaternion.Euler(Transform.rotation.x , Transform.rotation.y, 0);
     Transform.rotation = Quaternion.LookRotation(target.position - Transform.position);
     Ypos = Transform.position.y;
     x = 0;
     y = 0;
    }else{
    if (Input.GetAxis("Mouse ScroolWheel") !=0){
     distance = Vector3.distance (Transform.position , target.position) ;
      distance = ZoomLimit(distance - Input.GetAxis("Mouse ScrollWheel")*scrollSpeed, zoomMin, zoomMax);
      position = -(Transform.forward*distance) + target.position;
      Ypos = position.y;
      Transform.position = position;
     }
    }
      
    float d2 = Vector3.Distance (Transform.position, target.position);
    if (d2!=distance) {
     position = -(Transform.forward*distance) + target.position;
     position.y = Ypos;
     transform.position = position;
    }
}   
   public static float zoomLimit(float dist, float min, float max){
   if (dist<min)
     dist=min;
    if(dist>max)
     dist=max;
    return dist;
   }
}