using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class CameraRotateAround : MonoBehaviour {

    public Transform target;
    public Vector3 offset;
    public float sensitivity = 3; // чувствительность мышки
    public float limit = 80; // ограничение вращения по Y
    public float zoom = 0.25f; // чувствительность при увеличении, колесиком мышки
    public float zoomMax = 10; // макс. увеличение
    public float zoomMin = 3; // мин. увеличение
    private float X, Y;

    void Start ()
    {
  limit = Mathf.Abs(limit);
  if(limit > 90) limit = 90;
  offset = new Vector3(offset.x, offset.y, -Mathf.Abs(zoomMax)/2);
  transform.position = target.position + offset;
    }

    void Update ()
    {
  if(Input.GetAxis("Mouse ScrollWheel") > 0) offset.z += zoom;
  else if(Input.GetAxis("Mouse ScrollWheel") < 0) offset.z -= zoom;
  offset.z = Mathf.Clamp(offset.z, -Mathf.Abs(zoomMax), -Mathf.Abs(zoomMin));

  X = transform.localEulerAngles.y + Input.GetAxis("Mouse X") * sensitivity;
  Y += Input.GetAxis("Mouse Y") * sensitivity;
  Y = Mathf.Clamp (Y, -limit, limit);
  transform.localEulerAngles = new Vector3(-Y, X, 0);
  transform.position = transform.localRotation * offset + target.position;
    }
}