#3 Make an Air Hockey Game in Unity – RESTRICTING MOVEMENT (Code)

This post contains all the code that’s been written from this YouTube video.

PlayGamesScript.cs

using UnityEngine;

public class PlayerMovement : MonoBehaviour {

    bool wasJustClicked = true;
    bool canMove;
    Vector2 playerSize;

    Rigidbody2D rb;

    public Transform BoundaryHolder;

    Boundary playerBoundary;

    struct Boundary
    {
        public float Up, Down, Left, Right;

        public Boundary(float up, float down, float left, float right)
        {
            Up = up; Down = down; Left = left; Right = right;
        }
    }

	// Use this for initialization
	void Start () {
        playerSize = GetComponent<SpriteRenderer>().bounds.extents;
        rb = GetComponent<Rigidbody2D>();

        playerBoundary = new Boundary(BoundaryHolder.GetChild(0).position.y,
                                      BoundaryHolder.GetChild(1).position.y,
                                      BoundaryHolder.GetChild(2).position.x,
                                      BoundaryHolder.GetChild(3).position.x);

    }
	
	// Update is called once per frame
	void Update () {
		if (Input.GetMouseButton(0))
        {
            Vector2 mousePos = Camera.main.ScreenToWorldPoint(Input.mousePosition);

            if (wasJustClicked)
            {
                wasJustClicked = false;

                if ((mousePos.x >= transform.position.x && mousePos.x < transform.position.x + playerSize.x ||
                mousePos.x <= transform.position.x && mousePos.x > transform.position.x - playerSize.x) &&
                (mousePos.y >= transform.position.y && mousePos.y < transform.position.y + playerSize.y ||
                mousePos.y <= transform.position.y && mousePos.y > transform.position.y - playerSize.y))
                {
                    canMove = true;
                }
                else
                {
                    canMove = false;
                }
            }

            if (canMove)
            {
                Vector2 clampedMousePos = new Vector2(Mathf.Clamp(mousePos.x, playerBoundary.Left,
                                                                  playerBoundary.Right),
                                                      Mathf.Clamp(mousePos.y, playerBoundary.Down,
                                                                  playerBoundary.Up));
                rb.MovePosition(clampedMousePos);
            }
        }
        else
        {
            wasJustClicked = true;
        }
	}
}