Fruitomation/Assets/Scripts/UI/GameCursor.cs

using System;
using System.Collections.Generic;
using Fruitomation.Game;
using UnityEngine;

namespace Fruitomation.UI
{
    public class GameCursor : MonoBehaviour
    {
        [Header("References")]
        [SerializeField] private Camera ActiveCamera;
        [SerializeField] private CircleCollider2D CursorCollider;
        [SerializeField] private RectTransform RectTransform;

        private readonly ContactFilter2D ContactFilter = new();
        private readonly List<Collider2D> Colliders = new();
        
        private float CurrentMouseClickStrength;
        private float StartOfMouseClick;
        
        private void UpdatePosition()
        {
            Ray ray = ActiveCamera.ScreenPointToRay(Input.mousePosition);
            
            float t = -ray.origin.z / ray.direction.z;
            Vector2 position = ray.origin + t * ray.direction;
            transform.position = position;
        }

        private void UpdateMouseState()
        {
            const float MIN_STRENGTH = 0.5f;

            if (Input.GetMouseButtonUp(0))
            {
                CurrentMouseClickStrength = MIN_STRENGTH;
                
                CursorCollider.radius = CurrentMouseClickStrength * 30f;
                Physics2D.OverlapCollider(CursorCollider, ContactFilter, Colliders);
                
                foreach (Collider2D col in Colliders)
                {
                    if (col.transform.name == "Sprite")
                    {
                        FruitBehaviour fruit = col.GetComponentInParent<FruitBehaviour>();
                        Debug.Assert(fruit != null, "Couldn't find FruitBehaviour");
                        
                        fruit.TriggerDestruction();
                    }
                }
            }
            
            if (Input.GetMouseButton(0))
            {
                if (Input.GetMouseButtonDown(0))
                {
                    StartOfMouseClick = Time.time;
                    CurrentMouseClickStrength = MIN_STRENGTH;
                    return;
                }
                
                CurrentMouseClickStrength = Time.time - StartOfMouseClick;
                CurrentMouseClickStrength = Mathf.Clamp(CurrentMouseClickStrength, MIN_STRENGTH, 1.7f);
            }

            else
            {
                CurrentMouseClickStrength = MIN_STRENGTH;
            }
        }

        private void CalculateGridPosition()
        {
            Vector2 p0 = RectTransform.anchoredPosition;
            Vector2 p1 = p0 - new Vector2(0, 100f); // Offset of the grid from the middle of the screen
            Vector2 p2 = p1 / 40f;
            Vector2 p3 = p2 + new Vector2(48f, 24f); // Half size of the grid
            Vector2Int p4 = Vector2Int.FloorToInt(p3);
            Vector2Int p5 = new
            (
                Math.Clamp(p4.x, 0, 95), // size.x - 1
                Math.Clamp(p4.y, 0, 48) // size.y - 1
            );
            Debug.Log(p5);
        }

        private void Update()
        {
            UpdateMouseState();
            UpdatePosition();
            CalculateGridPosition();

            RectTransform.localScale = new Vector3(CurrentMouseClickStrength, CurrentMouseClickStrength, 1f);
        }
    }
}