GravityGems

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

public class CollectiblePieceScript : MonoBehaviour {
    Vector3 target;
    TrailRenderer trail;
    Rigidbody2D rb;
    Transform baseParent;
    SpriteRenderer sprite;

    private void Awake()
    {
        rb = GetComponent<Rigidbody2D>();
        trail = GetComponent<TrailRenderer>();
        sprite = GetComponent<SpriteRenderer>();
        trail.enabled = false;
        baseParent = this.transform.parent;
    }

    // Use this for initialization
    void Start()
    {
        target = GameObject.Find("ScoreTrigger").transform.position;
    }

    public void Explode()
    {
        rb.WakeUp();
        Vector2 explodeForce = Vector2.left + Vector2.up;
        explodeForce.Normalize();
        explodeForce = transform.TransformDirection(explodeForce);
        explodeForce += new Vector2(Random.Range(-0.5f, 0.5f), Random.Range(-0.5f, 0.5f));
        rb.AddForce(explodeForce * 1000.0f, ForceMode2D.Impulse);
        trail.enabled = true;
        sprite.enabled = true;
    }

    public void Reset()
    {
        trail.enabled = false;
        sprite.enabled = false;
        rb.Sleep();
        this.transform.parent = baseParent;
        this.transform.localPosition = Vector3.zero;
        this.GetComponent<CollectiblePieceScript>().enabled = false;
    }

    // Update is called once per frame
    void Update()
    {
        MoveToTarget();
    }

    void MoveToTarget()
    {
        Vector2 force = target - transform.position;
        float distance = force.magnitude;
        force.Normalize();
        float strength = distance * distance * 10.0f;
        strength = Mathf.Clamp(strength, 1.0f, 800000.0f);

        force *= strength;
        force *= 0.5f;
        rb.AddForce(force * Time.deltaTime);
    }
}