Unity3D / Левитация / Levitate

Levitate.cs

using UnityEngine;
using System.Collections;

public class Levitate : MonoBehaviour
{
    private const float SpeedMultiplier = .05F;

    private float _speedX = 0.0F;
    private float _speedY = 0.0F;
    private Vector2 _upperLeftLimit;
    private Vector2 _bottomRightLimit;

    void Start()
    {
        var pos = transform.localPosition;
        _upperLeftLimit = new Vector2(pos.x - 5, pos.y - 5);
        _bottomRightLimit = new Vector2(pos.x + 5, pos.y + 5);
    }

    void Update()
    {
        _speedX += Random.Range(0, SpeedMultiplier) - SpeedMultiplier / 2;
        _speedY += Random.Range(0, SpeedMultiplier) - SpeedMultiplier / 2;

        var pos = transform.localPosition;

        if (pos.x + _speedX > _upperLeftLimit.x && pos.x + _speedX < _bottomRightLimit.x)
            pos.x += _speedX;
        else
            _speedX = 0;

        if (pos.y + _speedY > _upperLeftLimit.y && pos.y + _speedY < _bottomRightLimit.y)
            pos.y += _speedY;
        else
            _speedY = 0;

        transform.localPosition = pos;
    }
}