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using UnityEngine;
using System.Collections;
 
 
 
public class WowCamera : MonoBehaviour
{
    public Transform target;
 
    public float targetHeight = 1.7f;
    public float distance = 5.0f;
    public float offsetFromWall = 0.1f;
 
    public float maxDistance = 20;
    public float minDistance = .6f;
 
    public float xSpeed = 200.0f;
    public float ySpeed = 200.0f;
   public float targetSpeed = 5.0f;
 
 
    public int yMinLimit = -80;
    public int yMaxLimit = 80;
 
    public int zoomRate = 40;
 
    public float rotationDampening = 3.0f;
    public float zoomDampening = 5.0f;
 
    public LayerMask collisionLayers = -1;
 
    private float xDeg = 0.0f;
    private float yDeg = 0.0f;
    private float currentDistance;
    private float desiredDistance;
    private float correctedDistance;
 
    void Start ()
    {
        Vector3 angles = transform.eulerAngles;
        xDeg = angles.x;
        yDeg = angles.y;
 
        currentDistance = distance;
        desiredDistance = distance;
        correctedDistance = distance;
 
        // Make the rigid body not change rotation
        if (rigidbody)
            rigidbody.freezeRotation = true;
    }
 
 
   void Update()
   {
 
      //Move the Player with left & right button press together
      if(Input.GetMouseButton(1)&&Input.GetMouseButton(0))
      {
      float targetRotationAngle = target.eulerAngles.y;
      float currentRotationAngle = transform.eulerAngles.y;
      xDeg = Mathf.LerpAngle (currentRotationAngle, targetRotationAngle, rotationDampening * Time.deltaTime);             
      target.transform.Rotate(0,Input.GetAxis ("Mouse X") * xSpeed  * 0.02f,0);
      xDeg += Input.GetAxis ("Mouse X") * targetSpeed * 0.02f;
      target.transform.Translate(Vector3.forward * targetSpeed * Time.deltaTime);
      }
   }
 
    /**
     * Camera logic on LateUpdate to only update after all character movement logic has been handled.
     */
    void LateUpdate ()
    {
       Vector3 vTargetOffset;
 
       // Don't do anything if target is not defined
        if (!target)
            return;
 
        // If either mouse buttons are down, let the mouse govern camera position
        if (Input.GetMouseButton(0))
        {
            xDeg += Input.GetAxis ("Mouse X") * xSpeed * 0.02f;
            yDeg -= Input.GetAxis ("Mouse Y") * ySpeed * 0.02f;
        }
      //Reset the camera angle and Rotate the Target Around the World!
      else if (Input.GetMouseButton(1))
      {
      float targetRotationAngle = target.eulerAngles.y;
      float currentRotationAngle = transform.eulerAngles.y;
      xDeg = Mathf.LerpAngle (currentRotationAngle, targetRotationAngle, rotationDampening * Time.deltaTime);    
      target.transform.Rotate(0,Input.GetAxis ("Mouse X") * xSpeed * 0.02f,0);
      xDeg += Input.GetAxis ("Mouse X") * xSpeed * 0.02f;
      }
 
 
        // otherwise, ease behind the target if any of the directional keys are pressed
        else if (Input.GetAxis("Vertical") != 0 || Input.GetAxis("Horizontal") != 0)
        {
            float targetRotationAngle = target.eulerAngles.y;
            float currentRotationAngle = transform.eulerAngles.y;
            xDeg = Mathf.LerpAngle (currentRotationAngle, targetRotationAngle, rotationDampening * Time.deltaTime);
        }
 
        yDeg = ClampAngle (yDeg, yMinLimit, yMaxLimit);
 
 
        // set camera rotation
        Quaternion rotation = Quaternion.Euler (yDeg, xDeg, 0);
 
        // calculate the desired distance
        desiredDistance -= Input.GetAxis ("Mouse ScrollWheel") * Time.deltaTime * zoomRate * Mathf.Abs (desiredDistance);
        desiredDistance = Mathf.Clamp (desiredDistance, minDistance, maxDistance);
        correctedDistance = desiredDistance;
 
        // calculate desired camera position
        vTargetOffset = new Vector3 (0, -targetHeight, 0);
        Vector3 position = target.position - (rotation * Vector3.forward * desiredDistance + vTargetOffset);
 
        // check for collision using the true target's desired registration point as set by user using height
        RaycastHit collisionHit;
        Vector3 trueTargetPosition = new Vector3 (target.position.x, target.position.y + targetHeight, target.position.z);
 
        // if there was a collision, correct the camera position and calculate the corrected distance
        bool isCorrected = false;
        if (Physics.Linecast (trueTargetPosition, position, out collisionHit, collisionLayers.value))
        {
            // calculate the distance from the original estimated position to the collision location,
            // subtracting out a safety "offset" distance from the object we hit.  The offset will help
            // keep the camera from being right on top of the surface we hit, which usually shows up as
            // the surface geometry getting partially clipped by the camera's front clipping plane.
            correctedDistance = Vector3.Distance (trueTargetPosition, collisionHit.point) - offsetFromWall;
            isCorrected = true;
        }
 
        // For smoothing, lerp distance only if either distance wasn't corrected, or correctedDistance is more than currentDistance
        currentDistance = !isCorrected || correctedDistance > currentDistance ? Mathf.Lerp (currentDistance, correctedDistance, Time.deltaTime * zoomDampening) : correctedDistance;
 
      // keep within legal limits
        currentDistance = Mathf.Clamp (currentDistance, minDistance, maxDistance);
 
        // recalculate position based on the new currentDistance
        position = target.position - (rotation * Vector3.forward * currentDistance + vTargetOffset);
 
        transform.rotation = rotation;
        transform.position = position;
    }
 
    private static float ClampAngle (float angle, float min, float max)
    {
        if (angle < -360)
            angle += 360;
        if (angle > 360)
            angle -= 360;
        return Mathf.Clamp (angle, min, max);
    }
}