Squishable.cs

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

// An effect that causes a sprite to be squished vertically or horizontally
// e.g. player on jumping, enemies on hit
public class Squishable : MonoBehaviour {
    [SerializeField] [Range(0, 1)] float squishAmount = 0.5f;
    [SerializeField] [Range(0, 1)] float squishDuration = 0.1f;

    [SerializeField] SpriteRenderer spriteRenderer;
    
    Tween squishTween;

    public void SquishWide() {
        squishTween.Start(
            squishDuration,
            (float x) => {
                float squish = 1 + (1 - Easing.CubicIn(x)) * squishAmount;
                spriteRenderer.transform.localScale = new Vector3(squish, 1 / squish, 1);
            }, () => {
                spriteRenderer.transform.localScale = new Vector3(1, 1, 1);
            }
        );
    }

    public void SquishThin() {
        squishTween.Start(
            squishDuration,
            (float x) => {
                float squish = 1 + (1 - Easing.CubicIn(x)) * squishAmount;
                spriteRenderer.transform.localScale = new Vector3(1 / squish, squish, 1);
            }, () => {
                spriteRenderer.transform.localScale = new Vector3(1, 1, 1);
            }
        );
    }

    void Awake() {
        squishTween = new Tween(this);
    }
}