Tag: play

I'm doing a simple snake game in Unity 2D. And the snake tail doesn't follow directly behind the snake's head as it is intended.

The following happens: https://imgur.com/a/zG6hbd7

This is my code:

using System.Collections;

using System.Collections.Generic;
with UnityEngine;
using System.Linq;

public class SnakeMovement: MonoBehaviour
{

private Vector3 fp;   //First touch position
private Vector3 lp;   //Last touch position

private float dragDistance;  //minimum distance for a swipe to be registered
private float speed = 13f;

private Rigidbody2D rb;
private Vector2 moveVelocity;

public GameObject tail;

public List tailPositions;

void Start() {
    dragDistance = Screen.height * 5 / 100; //dragDistance is 5% height of the screen
    rb = GetComponent();
}

void Update() {

    if (Input.touchCount == 1) // user is touching the screen with a single touch
    {
        Touch touch = Input.GetTouch(0); // get the touch
        if (touch.phase == TouchPhase.Began) //check for the first touch
        {
            fp = touch.position;
            lp = touch.position;
        }
        else if (touch.phase == TouchPhase.Moved) // update the last position based on where they moved
        {
            lp = touch.position;
        }
        else if (touch.phase == TouchPhase.Ended) //check if the finger is removed from the screen
        {
            lp = touch.position;  //last touch position. Ommitted if you use list

            //Check if drag distance is greater than ?% of the screen height
            if (Mathf.Abs(lp.x - fp.x) > dragDistance || Mathf.Abs(lp.y - fp.y) > dragDistance)
            {//It's a drag
             //check if the drag is vertical or horizontal

                if (Mathf.Abs(lp.x - fp.x) > Mathf.Abs(lp.y - fp.y)) {   //If the horizontal movement is greater than the vertical movement...
                    if ((lp.x > fp.x)) {   //Right swipe
                        if(moveVelocity != Vector2.left) {
                            moveVelocity = Vector2.right;
                        }
                    }
                    else {   //Left swipe
                        if(moveVelocity != Vector2.right) {
                            moveVelocity = Vector2.left;
                        }
                    }
                }
                else {   //the vertical movement is greater than the horizontal movement
                    if (lp.y > fp.y) {   //Up swipe
                        if(moveVelocity != Vector2.down) {
                            moveVelocity = Vector2.up;
                        }
                    }
                    else {   //Down swipe
                        if(moveVelocity != Vector2.up) {
                            moveVelocity = Vector2.down;
                        }
                    }
                }

            }
        }
    }

}

void FixedUpdate() {
    Vector3 lastPos = transform.position;

    rb.MovePosition(rb.position + moveVelocity * speed * Time.deltaTime);

    if (tailPositions.Count >= 1) {
        tailPositions.Last().position = lastPos;
        tailPositions.Insert(0, tailPositions.Last ());
        tailPositions.RemoveAt(tailPositions.Count - 1);
    }
}

void OnTriggerEnter2D(Collider2D trigger) {
    Vector2 spawnPos = new Vector2(5, 5);

    if (trigger.tag == "Food") {
        GameObject newTail = Instantiate(tail, spawnPos, Quaternion.identity) as GameObject;
        newTail.transform.parent = GameObject.Find("Tail Holder").transform;
        tailPositions.Add(newTail.transform);
    }
}

}}

Thank you for taking the time to help me.