Brick.cs

Source file unity-csharp/arcade-classics/breakout/Brick.cs from the GDnD code examples. Download raw file

// GDnD wiki example
// Demonstrates: a single destructible object that takes hits, awards score, and reports its own death via an event
// Related pages: [[overview-arcade-classics-as-learning-projects]], [[observer-pattern]], [[unity-collider2d-and-triggers]]
 
using System;
using UnityEngine;
 
// One brick. It knows nothing about the grid or the score — it just takes hits,
// optionally changes colour as it weakens, and raises Destroyed when it dies.
// The grid listens; this keeps each object's responsibility small.
[RequireComponent(typeof(Collider2D), typeof(SpriteRenderer))]
public class Brick : MonoBehaviour
{
    [SerializeField] private int hitPoints = 1;
    [SerializeField] private int scoreValue = 100;
 
    // Passes its own score value so the grid/game can tally without inspecting the brick.
    public event Action<int> Destroyed;
 
    private SpriteRenderer spriteRenderer;
    private Color baseColour;
 
    private void Awake()
    {
        spriteRenderer = GetComponent<SpriteRenderer>();
        baseColour = spriteRenderer.color;
    }
 
    // Called by the ball on contact. Returns true if the brick survived.
    public bool Hit()
    {
        hitPoints--;
        if (hitPoints > 0)
        {
            // Darken as it weakens so multi-hit bricks read clearly — cheap [[game-feel]].
            spriteRenderer.color = baseColour * 0.6f;
            return true;
        }
 
        Destroyed?.Invoke(scoreValue);
        Destroy(gameObject);
        return false;
    }
}