From fb2703b646d22bd4502fab6f0ca58cb922d1ed2c Mon Sep 17 00:00:00 2001
From: Toby Vincent <tobyv13@gmail.com>
Date: Fri, 8 Apr 2022 17:24:16 -0500
Subject: wip: no regerts

fix jump; race condition(ish) in jump/fall/land events (?)
impl trigger animations on events
refactor control, (follow) camera, anim handlers into interfaces
impl controller pattern for controls (FSM using lambdas + interfaces)
come up with the rest of the todos
---
 Assets/Scripts/CharacterController2D.cs | 154 ++++++++++++++++++++++++++++++++
 1 file changed, 154 insertions(+)
 create mode 100644 Assets/Scripts/CharacterController2D.cs

(limited to 'Assets/Scripts/CharacterController2D.cs')

diff --git a/Assets/Scripts/CharacterController2D.cs b/Assets/Scripts/CharacterController2D.cs
new file mode 100644
index 0000000..bf62498
--- /dev/null
+++ b/Assets/Scripts/CharacterController2D.cs
@@ -0,0 +1,154 @@
+using System;
+using System.Collections;
+using UnityEngine;
+using UnityEngine.Events;
+
+[RequireComponent(typeof(Rigidbody2D))]
+[RequireComponent(typeof(CapsuleCollider2D))]
+
+public class CharacterController2D : MonoBehaviour
+{
+    public enum Direction
+    {
+        left = -1,
+        right = 1
+    }
+
+    [SerializeField] Camera mainCamera;
+    [SerializeField] float acceleration = 40f;
+    [SerializeField][Range(0, .3f)] float smoothing = .05f;
+    [SerializeField] float gravityScale = 1.5f;
+    [SerializeField] float jumpForce = 50f;
+    [SerializeField] int maxJumpCount = 1;
+    [SerializeField] bool airControl = true;
+
+    internal UnityEvent OnIdleEvent;
+    internal UnityEvent OnFlip;
+    internal UnityEvent OnJump;
+    internal UnityEvent OnLand;
+    internal UnityEvent OnFall;
+
+    public Direction direction = Direction.right;
+    public Vector2 velocity = Vector2.zero;
+    public int jumpCount = 0;
+    public bool isGrounded = false;
+    public Vector3 cameraPos;
+    public Rigidbody2D _rigidBody;
+    public CapsuleCollider2D _collider;
+    public Transform _transform;
+
+    void Awake()
+    {
+        _rigidBody = GetComponent<Rigidbody2D>();
+        _collider = GetComponent<CapsuleCollider2D>();
+        OnIdleEvent ??= new UnityEvent();
+        OnFlip ??= new UnityEvent();
+        OnJump ??= new UnityEvent();
+        OnFall ??= new UnityEvent();
+        OnLand ??= new UnityEvent();
+    }
+
+    // Use this for initialization
+    void Start()
+    {
+        _transform = transform;
+        _rigidBody.freezeRotation = true;
+        _rigidBody.collisionDetectionMode = CollisionDetectionMode2D.Continuous;
+        _rigidBody.gravityScale = gravityScale;
+        direction = (Direction)(_transform.localScale.x / Mathf.Abs(_transform.localScale.x));
+
+        jumpCount = maxJumpCount;
+
+        if (mainCamera)
+            cameraPos = mainCamera.transform.position;
+
+        OnFlip.AddListener(HandleFlip);
+        OnJump.AddListener(HandleJump);
+        OnFall.AddListener(HandleFall);
+        OnLand.AddListener(HandleLand);
+    }
+
+    void Update()
+    {
+        if (isGrounded || airControl)
+            HandleHorzInput(Input.GetAxisRaw("Horizontal"));
+
+        // Changing this to `canJump` or `jumpCount > 0` would allow for things like double jumping.
+        if (jumpCount > 0 && Input.GetButtonDown("Jump"))
+            OnJump.Invoke();
+
+
+        if (mainCamera)
+        {
+            var targetPos = new Vector3(_transform.position.x, cameraPos.y, cameraPos.z);
+            mainCamera.transform.position = Vector3.Lerp(mainCamera.transform.position, targetPos, 0.25f);
+        }
+    }
+
+    void FixedUpdate()
+    {
+        CheckCollision();
+    }
+
+    public void Move(float magnitude)
+    {
+        Vector3 targetVelocity = new Vector2(magnitude, _rigidBody.velocity.y);
+        _rigidBody.velocity = Vector2.SmoothDamp(_rigidBody.velocity, targetVelocity, ref velocity, smoothing);
+    }
+
+    void CheckCollision()
+    {
+        var evnt = isGrounded ? OnFall : OnLand;
+
+        float colliderRadius = _collider.size.x * 0.4f * Mathf.Abs(transform.localScale.x);
+        Vector3 groundCheckPos = new Vector3(_collider.bounds.size.x * 0.5f, colliderRadius * 0.9f, 0) + _collider.bounds.min;
+        Collider2D[] colliders = Physics2D.OverlapCircleAll(groundCheckPos, colliderRadius);
+
+        if (Array.Exists(colliders, c => c != _collider))
+        {
+            Debug.Log(Array.Find(colliders, c => c != _collider));
+            evnt.Invoke();
+        }
+    }
+
+    void HandleHorzInput(float horzInput)
+    {
+        Move(horzInput * acceleration);
+
+        if (horzInput * (int)direction < 0)
+            OnFlip.Invoke();
+    }
+
+
+    void HandleFlip()
+    {
+        Debug.Log("Flipping");
+        Vector3 theScale = transform.localScale;
+        theScale.x *= -1;
+        transform.localScale = theScale;
+
+        direction = direction == Direction.left ? Direction.right : Direction.left;
+    }
+
+    void HandleJump()
+    {
+        Debug.Log("Jumping");
+        jumpCount--;
+        _rigidBody.AddForce(Vector2.up * jumpForce);
+        OnFall.Invoke();
+    }
+
+
+    void HandleFall()
+    {
+        Debug.Log("Falling");
+        isGrounded = false;
+    }
+
+    void HandleLand()
+    {
+        Debug.Log("Landing");
+        isGrounded = true;
+        jumpCount = maxJumpCount;
+    }
+}
-- 
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