CODE_INTERMEDIATE.md

Code Intermediate

A list of intermediate topics working with C# in Unity

Generic Lists

using UnityEngine;
using System.Collections;
using System.Collections.Generic;

public class SceneController: MonoBehaviour {

    public List<string> shapes;

    void Start()
    {
        shapes = new List<string> { "circle", "square", "triangle", "octagon" };
        shapes.Add("rectangle");
        shapes.Insert(2, "diamond");

        shapes.Sort();
        var triangleShape = shapes.Find(s => s == "triangle");
    }
}

Dictionaries

using UnityEngine;
using System.Collections;
using System.Collections.Generic;

public class SceneController: MonoBehaviour {
    public Dictionary<string, Shape> shapeDictionary;

    void Start()
    {
        shapeDictionary = new Dictionary<string, Shape>();
        var shapeName = "Circle";
        var circle = new Shape { Name = shapeName };

        shapeDictionary.Add(shapeName, circle);
    }

    private void SetColorByName(string shapeName, Color color)
    {
        shapeDictionary[shapeName].SetColor(color);
    }

    void Update()
    {
        if (Input.GetKeyDown(KeyCode.C))
        {
            SetColorByName("Circle", Color.red);
        }
    }
}

Queues

using UnityEngine;
using System.Collections;
using System.Collections.Generic;

public class EnemiesController: MonoBehaviour {
    public Queue<Enemy> enemyQueue;

    void Start()
    {
        enemyQueue = new Queue<Enemy>();
        enemyQueue.Enqueue(new Enemy { Name = "Boss1" });
        enemyQueue.Enqueue(new Enemy { Name = "Boss2" });
        enemyQueue.Enqueue(new Enemy { Name = "Boss3" });
    }

    public Enemy GetFirstEnemy()
    {
        if (enemyQueue.Count > 0) {
            var enemy = enemyQueue.Dequeue();
            // Call any method if you want
            enemy.Animate();
            return enemy;
        }
        Debug.Log("Enemy queue is empty");
        return null;
    }
}

Stacks

using UnityEngine;
using System.Collections;
using System.Collections.Generic;

public class EnemiesController: MonoBehaviour {
    public Stack<Enemy> enemyStack;

    void Start()
    {
        enemyStack = new Stack<Enemy>();
        enemyStack.Push(new Enemy { Name = "Final boss" });
        enemyStack.Push(new Enemy { Name = "Superboss" });
        enemyStack.Push(new Enemy { Name = "Miniboss" });
    }

    public Enemy GetNextBoss()
    {
        if (enemyStack.Count > 0) {
            var enemy = enemyStack.Pop();
            // Call any method if you want
            enemy.Animate();
            return enemy;
        }
        Debug.Log("Final boss was killed");
        return null;
    }
}

Coroutines

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class TaskController : MonoBehaviour
{
    public List<Task> tasks;
    private Coroutine runTasksRoutine;

    private IEnumerator ExecuteTasksInSeries()
    {
        foreach(var task in tasks) {
            task.doSomething();
            // Delay before execute next task
            yield return new WaitForSeconds(2);
            task.doSomethingElse();
            // Other delay options
            // WaitUntil()
            // WaitWhile()
            // WaitForEndOfFrame()
            // WaitForFixedUpdate()
            // WaitForSecondsRealtime()
        }
        // Pause the game
        Time.timeScale = 0;
        yield return new WaitForSecondsRealtime(1);
        Debug.Log("I just wasted for a second, it's not affected by scaled time");
    }

    void Start()
    {
        tasks = new List<Task>();
        // Add your tasks here
        runTasksRoutine = StartCoroutine(ExecuteTasksInSeries());
    }

    void Update()
    {
        if (Input.GetKeyDown(KeyCode.S))
        {
            // Stop all coroutines
            StopAllCoroutines();
            // Specify the coroutine
            StopCoroutine(runTasksRoutine);
        }
    }
}

Events

• EventManager.cs

using UnityEngine;
using System.Collections;

public class EventManager : MonoBehaviour 
{
    public delegate void ClickAction();
    public static event ClickAction OnClicked;


    void OnGUI()
    {
        if(GUI.Button(new Rect(Screen.width / 2 - 50, 5, 100, 30), "Click"))
        {
            if(OnClicked != null)
                OnClicked();
        }
    }
}

• TeleportScript.cs

using UnityEngine;
using System.Collections;

public class TeleportScript : MonoBehaviour 
{
    void OnEnable()
    {
        EventManager.OnClicked += Teleport;
    }


    void OnDisable()
    {
        EventManager.OnClicked -= Teleport;
    }


    void Teleport()
    {
        Vector3 pos = transform.position;
        pos.y = Random.Range(1.0f, 3.0f);
        transform.position = pos;
    }
}

• TurnColorScript.cs

using UnityEngine;
using System.Collections;

public class TurnColorScript : MonoBehaviour 
{
    void OnEnable()
    {
        EventManager.OnClicked += TurnColor;
    }


    void OnDisable()
    {
        EventManager.OnClicked -= TurnColor;
    }


    void TurnColor()
    {
        Color col = new Color(Random.value, Random.value, Random.value);
        renderer.material.color = col;
    }
}