Merge pull request #2 from yuzhengwen/main

Merge changes to branch

Assets/DynamicController.cs

@@ -0,0 +1,113 @@
+using System;
+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+public class DynamicController : MonoBehaviour
+{
+    protected Rigidbody2D rb;
+    protected Collider2D col;
+    public LayerMask groundLayer;
+    public float xInput;
+    public float moveSpeed = 5f;
+    public float maxSlopeAngle = 45;
+
+    public float slopeCheckDistance = 0.5f;
+    private float slopeDownAngle;
+    private float slopeSideAngle;
+    private float lastSlopeAngle;
+
+    private bool onSlope;
+    private bool isGrounded;
+
+    Vector2 groundParallel;
+
+    void Start()
+    {
+        rb = GetComponent<Rigidbody2D>();
+        col = GetComponent<Collider2D>();
+    }
+
+    // Update is called once per frame
+    void Update()
+    {
+        xInput = Input.GetAxisRaw("Horizontal");
+    }
+    private void FixedUpdate()
+    {
+        float targetXVel = xInput * moveSpeed;
+
+        Vector2 bottomCenter = new(col.bounds.center.x, col.bounds.min.y);
+        CheckGround();
+        SlopeCheckHorizontal(bottomCenter);
+        SlopeCheckVertical(bottomCenter);
+        SetVelocity(targetXVel);
+    }
+    private void SetVelocity(float targetXVel)
+    {
+        if (isGrounded && !onSlope) //if not on slope
+        {
+            rb.velocity = new(targetXVel, 0.0f);
+        }
+        else if (isGrounded && onSlope) //If on slope
+        {
+            rb.velocity = new(moveSpeed * groundParallel.x * -xInput, moveSpeed * groundParallel.y * -xInput);
+        }
+        else if (!isGrounded) //If in air
+        {
+            rb.velocity = new(targetXVel, rb.velocity.y);
+        }
+    }
+    private void CheckGround()
+    {
+        isGrounded = Physics2D.BoxCast(col.bounds.center, col.bounds.size, 0f, Vector2.down, 0.1f, groundLayer);
+    }
+
+    private void SlopeCheckHorizontal(Vector2 bottomCenter)
+    {
+        RaycastHit2D hitRight = Physics2D.Raycast(bottomCenter, transform.right, slopeCheckDistance, groundLayer);
+        RaycastHit2D hitLeft = Physics2D.Raycast(bottomCenter, -transform.right, slopeCheckDistance, groundLayer);
+
+        if (hitRight)
+        {
+            onSlope = true;
+            slopeSideAngle = Vector2.Angle(hitRight.normal, Vector2.up);
+        }
+        else if (hitLeft)
+        {
+            onSlope = true;
+            slopeSideAngle = Vector2.Angle(hitLeft.normal, Vector2.up);
+        }
+        else
+        {
+            slopeSideAngle = 0;
+            onSlope = false;
+        }
+    }
+    private void SlopeCheckVertical(Vector2 bottomCenter)
+    {
+        RaycastHit2D hit = Physics2D.Raycast(bottomCenter, Vector2.down, slopeCheckDistance, groundLayer);
+        if (hit)
+        {
+            groundParallel = Vector2.Perpendicular(hit.normal).normalized;
+            slopeDownAngle = Vector2.Angle(hit.normal, Vector2.up);
+
+            Debug.DrawRay(hit.point, hit.normal, Color.red);
+            Debug.DrawRay(transform.position, groundParallel, Color.red);
+
+            if (slopeDownAngle != lastSlopeAngle)
+            {
+                onSlope = true;
+            }
+            lastSlopeAngle = slopeDownAngle;
+        }
+        if (onSlope && xInput == 0)
+        {
+            rb.sharedMaterial.friction = 1;
+        }
+        else
+        {
+            rb.sharedMaterial.friction = 0;
+        }
+    }
+}

Assets/Player.physicsMaterial2D

@@ -0,0 +1,11 @@
+%YAML 1.1
+%TAG !u! tag:unity3d.com,2011:
+--- !u!62 &6200000
+PhysicsMaterial2D:
+  m_ObjectHideFlags: 0
+  m_CorrespondingSourceObject: {fileID: 0}
+  m_PrefabInstance: {fileID: 0}
+  m_PrefabAsset: {fileID: 0}
+  m_Name: Player
+  friction: 0
+  bounciness: 0