레일

Rail on Unity

스크린샷

사양

소스 코드

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEditor;
using UnityEditorInternal;

public class Rail : MonoBehaviour {

    // 閉じる
    public bool isClose = false;

    // レール点のリスト
    public List<GameObject> railPoints = new List<GameObject>();

    //----
    // アクセサ
    //----

    // レール点の数を取得する
    public int getRailPointNum()
    {
        return railPoints.Count;
    }

    // レール点を取得する
    public GameObject getRailPoint( int i )
    {
        Debug.Assert (railPoints.Count > 0);
        return railPoints [i];
    }

    // Use this for initialization
    void Start () {

    }

    // Update is called once per frame
    void Update () {

    }

    void OnDrawGizmos() {
        for( int i = 0, n = railPoints.Count; i < n; ++i ) {
            if (i == n - 1 && !isClose) {
                break;
            }

            GameObject from = railPoints [i];
            GameObject to   = railPoints [(i + 1) % n];
            Gizmos.color = Color.green;
            Gizmos.DrawLine (from.transform.position, to.transform.position);
        }
    }

    // レールのカスタムエディタ
    [CustomEditor(typeof(Rail))]
    public class RailEditor : Editor
    {
        ReorderableList railPointsReorderableList;

        private Rail rail
        {
            get
            {
                return target as Rail;
            }
        }

        void OnEnable()
        {
            railPointsReorderableList = new ReorderableList (serializedObject, serializedObject.FindProperty ("railPoints"));

            // コールバック設定
            railPointsReorderableList.onAddCallback += AddRailPoint;
            railPointsReorderableList.onRemoveCallback += RemoveRailPoint;
        }

        public override void OnInspectorGUI()
        {
            DrawDefaultInspector ();

            serializedObject.Update ();

            railPointsReorderableList.DoLayoutList ();

            serializedObject.ApplyModifiedProperties ();
        }

        // レール点を追加する
        private void AddRailPoint(ReorderableList list)
        {
            // レール点の生成位置
            Vector3 position;
            {
                // 最初のレール点 ⇒ レールの位置
                if (rail.railPoints.Count == 0)
                {
                    position = rail.transform.position;
                }
                // 既にレール点がある ⇒ 最後のレール点の位置
                else
                {
                    GameObject railPoint_Last = rail.railPoints [rail.railPoints.Count - 1];
                    position = railPoint_Last.transform.position;
                }
            }

            // レール点生成
            GameObject prefab = (GameObject)Resources.Load ("Prefabs/RailPoint");
            GameObject railPoint_New = Instantiate (prefab, position, Quaternion.identity);

            // リストに追加
            rail.railPoints.Add (railPoint_New);

            // レールの子にする
            railPoint_New.transform.parent = rail.transform;
        }

        // レール点を削除する
        private void RemoveRailPoint(ReorderableList list)
        {
            GameObject railPoint = rail.railPoints [list.index];
            rail.railPoints.Remove (railPoint);
            DestroyImmediate (railPoint);
        }
    }
}