前回のチュートリアル

スクリプトの更新

スクリプトファイルを開いて下記のコードを貼り付けて保存します

Controller2D.cs

using UnityEngine;
using System.Collections;

[RequireComponent (typeof (BoxCollider2D))]
public class Controller2D : MonoBehaviour {

    public LayerMask collisionMask;

    const float skinWidth = .015f;
    public int horizontalRayCount = 4;
    public int verticalRayCount = 4;

    float horizontalRaySpacing;
    float verticalRaySpacing;

    BoxCollider2D collider;
    RaycastOrigins raycastOrigins;

    void Start() {
        collider = GetComponent<BoxCollider2D> ();
        CalculateRaySpacing ();
    }

    public void Move(Vector3 velocity) {
        UpdateRaycastOrigins ();
        if (velocity.x != 0) {
            HorizontalCollisions (ref velocity);
        }
        if (velocity.y != 0) {
            VerticalCollisions (ref velocity);
        }

        transform.Translate (velocity);
    }

    void HorizontalCollisions(ref Vector3 velocity) {
        float directionX = Mathf.Sign (velocity.x);
        float rayLength = Mathf.Abs (velocity.x) + skinWidth;

        for (int i = 0; i < horizontalRayCount; i ++) {
            Vector2 rayOrigin = (directionX == -1)?raycastOrigins.bottomLeft:raycastOrigins.bottomRight;
            rayOrigin += Vector2.up * (horizontalRaySpacing * i);
            RaycastHit2D hit = Physics2D.Raycast(rayOrigin, Vector2.right * directionX, rayLength, collisionMask);

            Debug.DrawRay(rayOrigin, Vector2.right * directionX * rayLength,Color.red);

            if (hit) {
                velocity.x = (hit.distance - skinWidth) * directionX;
                rayLength = hit.distance;
            }
        }
    }

    void VerticalCollisions(ref Vector3 velocity) {
        float directionY = Mathf.Sign (velocity.y);
        float rayLength = Mathf.Abs (velocity.y) + skinWidth;

        for (int i = 0; i < verticalRayCount; i ++) {
            Vector2 rayOrigin = (directionY == -1)?raycastOrigins.bottomLeft:raycastOrigins.topLeft;
            rayOrigin += Vector2.right * (verticalRaySpacing * i + velocity.x);
            RaycastHit2D hit = Physics2D.Raycast(rayOrigin, Vector2.up * directionY, rayLength, collisionMask);

            Debug.DrawRay(rayOrigin, Vector2.up * directionY * rayLength,Color.red);

            if (hit) {
                velocity.y = (hit.distance - skinWidth) * directionY;
                rayLength = hit.distance;
            }
        }
    }

    void UpdateRaycastOrigins() {
        Bounds bounds = collider.bounds;
        bounds.Expand (skinWidth * -2);

        raycastOrigins.bottomLeft = new Vector2 (bounds.min.x, bounds.min.y);
        raycastOrigins.bottomRight = new Vector2 (bounds.max.x, bounds.min.y);
        raycastOrigins.topLeft = new Vector2 (bounds.min.x, bounds.max.y);
        raycastOrigins.topRight = new Vector2 (bounds.max.x, bounds.max.y);
    }

    void CalculateRaySpacing() {
        Bounds bounds = collider.bounds;
        bounds.Expand (skinWidth * -2);

        horizontalRayCount = Mathf.Clamp (horizontalRayCount, 2, int.MaxValue);
        verticalRayCount = Mathf.Clamp (verticalRayCount, 2, int.MaxValue);

        horizontalRaySpacing = bounds.size.y / (horizontalRayCount - 1);
        verticalRaySpacing = bounds.size.x / (verticalRayCount - 1);
    }

    struct RaycastOrigins {
        public Vector2 topLeft, topRight;
        public Vector2 bottomLeft, bottomRight;
    }

}

Player.cs

using UnityEngine;
using System.Collections;

[RequireComponent (typeof (Controller2D))]
public class Player : MonoBehaviour {

    float moveSpeed = 6;
    float gravity = -20;
    Vector3 velocity;

    Controller2D controller;

    void Start() {
        controller = GetComponent<Controller2D> ();
    }

    void Update() {

        Vector2 input = new Vector2 (Input.GetAxisRaw ("Horizontal"), Input.GetAxisRaw ("Vertical"));

        velocity.x = input.x * moveSpeed;
        velocity.y += gravity * Time.deltaTime;
        controller.Move (velocity * Time.deltaTime);
    }
}