Adding character movement basics

Assets/Scripts/PlayerPlatformerController.cs

@@ -0,0 +1,102 @@
+using UnityEngine;
+using UnityEngine.InputSystem;
+
+[RequireComponent(typeof(Rigidbody2D))]
+[RequireComponent(typeof(BoxCollider2D))]
+public class PlayerPlatformerController : MonoBehaviour
+{
+    [SerializeField] private InputActionAsset inputActions;
+    [SerializeField] private string actionMapName = "Player";
+    [SerializeField] private string moveActionName = "Move";
+    [SerializeField] private string jumpActionName = "Jump";
+    [SerializeField] private float moveSpeed = 6f;
+    [SerializeField] private float jumpImpulse = 8f;
+    [SerializeField] private LayerMask groundMask = ~0;
+    [SerializeField] private float groundCheckDistance = 0.05f;
+
+    private Rigidbody2D body;
+    private BoxCollider2D bodyCollider;
+    private InputAction moveAction;
+    private InputAction jumpAction;
+
+    private void Awake()
+    {
+        body = GetComponent<Rigidbody2D>();
+        bodyCollider = GetComponent<BoxCollider2D>();
+    }
+
+    private void OnEnable()
+    {
+        if (inputActions == null)
+        {
+            Debug.LogError("PlayerPlatformerController missing InputActionAsset reference.", this);
+            return;
+        }
+
+        var map = inputActions.FindActionMap(actionMapName, true);
+        moveAction = map.FindAction(moveActionName, true);
+        jumpAction = map.FindAction(jumpActionName, true);
+
+        moveAction.Enable();
+        jumpAction.Enable();
+        jumpAction.performed += OnJumpPerformed;
+    }
+
+    private void OnDisable()
+    {
+        if (jumpAction != null)
+        {
+            jumpAction.performed -= OnJumpPerformed;
+            jumpAction.Disable();
+        }
+
+        if (moveAction != null)
+        {
+            moveAction.Disable();
+        }
+    }
+
+    private void FixedUpdate()
+    {
+        if (moveAction == null)
+        {
+            return;
+        }
+
+        var input = moveAction.ReadValue<Vector2>();
+        var velocity = body.linearVelocity;
+        velocity.x = input.x * moveSpeed;
+        body.linearVelocity = velocity;
+    }
+
+    private void OnJumpPerformed(InputAction.CallbackContext context)
+    {
+        if (!IsGrounded())
+        {
+            return;
+        }
+
+        var velocity = body.linearVelocity;
+        velocity.y = 0f;
+        body.linearVelocity = velocity;
+        body.AddForce(Vector2.up * jumpImpulse, ForceMode2D.Impulse);
+    }
+
+    private bool IsGrounded()
+    {
+        var bounds = bodyCollider.bounds;
+        var checkSize = new Vector2(bounds.size.x * 0.9f, groundCheckDistance * 2f);
+        var checkCenter = new Vector2(bounds.center.x, bounds.min.y - groundCheckDistance);
+        var hits = Physics2D.OverlapBoxAll(checkCenter, checkSize, 0f, groundMask);
+        for (var i = 0; i < hits.Length; i++)
+        {
+            var hit = hits[i];
+            if (hit != null && hit != bodyCollider)
+            {
+                return true;
+            }
+        }
+
+        return false;
+    }
+}

Assets/Scripts/PlayerPlatformerController.cs.meta

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