using UnityEngine;
using System.Collections;

public class CursorHide : MonoBehaviour {
    public float hideAfterSeconds = 3f;
    public float thresholdInPixels = 3f;

    float _lastTime;
    Vector3 _lastMousePos;

    void Start () {
        _lastTime = Time.timeSinceLevelLoad;
        _lastMousePos = Input.mousePosition;
    }

    void Update () {
        Vector2 dx = Input.mousePosition - _lastMousePos;
        bool move = (dx.sqrMagnitude > (thresholdInPixels * thresholdInPixels));
        _lastMousePos = Input.mousePosition;

        if (move)
            _lastTime = Time.timeSinceLevelLoad;

        Cursor.visible = (Time.timeSinceLevelLoad - _lastTime) < hideAfterSeconds;
    }
}