Coroutines

Checked with version: 4.1

-

Difficulty: Intermediate

How to create coroutines and use them to achieve complex behaviors.

Coroutines

Intermediate Scripting

CoroutinesExample

Code snippet

using UnityEngine;
using System.Collections;

public class CoroutinesExample : MonoBehaviour
{
    public float smoothing = 1f;
    public Transform target;
    
    
    void Start ()
    {
        StartCoroutine(MyCoroutine(target));
    }
    
    
    IEnumerator MyCoroutine (Transform target)
    {
        while(Vector3.Distance(transform.position, target.position) > 0.05f)
        {
            transform.position = Vector3.Lerp(transform.position, target.position, smoothing * Time.deltaTime);
            
            yield return null;
        }
        
        print("Reached the target.");
        
        yield return new WaitForSeconds(3f);
        
        print("MyCoroutine is now finished.");
    }
}
#pragma strict

public var smoothing : float = 1f;
public var target : Transform;
    
function Start () 
{
    MyCoroutine(target);
}

function MyCoroutine (target : Transform)
{
    while(Vector3.Distance(transform.position, target.position) > 0.05f)
    {
        transform.position = Vector3.Lerp(transform.position, target.position, smoothing * Time.deltaTime);
        
        yield;
    }
    
    print("Reached the target.");
    
    yield WaitForSeconds(3f);
    
    print("MyCoroutine is now finished.");
}
import UnityEngine
import System.Collections


public class CoroutinesExample(MonoBehaviour):

    public smoothing as single = 1.0F

    public target as Transform

    
    
    private def Start():
        StartCoroutine(MyCoroutine(target))

    
    
    private def MyCoroutine(target as Transform) as IEnumerator:
        while Vector3.Distance(transform.position, target.position) > 0.05000000075F:
            transform.position = Vector3.Lerp(transform.position, target.position, (smoothing * Time.deltaTime))
            
            yield null
        
        print('Reached the target.')
        
        yield WaitForSeconds(3.0F)
        
        print('MyCoroutine is now finished.')

PropertiesAndCoroutines

Code snippet

using UnityEngine;
using System.Collections;

public class PropertiesAndCoroutines : MonoBehaviour
{
    public float smoothing = 7f;
    public Vector3 Target
    {
        get { return target; }
        set
        {
            target = value;
            
            StopCoroutine("Movement");
            StartCoroutine("Movement", target);
        }
    }
    
    
    private Vector3 target;

    
    IEnumerator Movement (Vector3 target)
    {
        while(Vector3.Distance(transform.position, target) > 0.05f)
        {
            transform.position = Vector3.Lerp(transform.position, target, smoothing * Time.deltaTime);
            
            yield return null;
        }
    }
}
#pragma strict

public var smoothing : float = 7f;
private var target : Vector3;

function  SetTarget(value : Vector3)
{
    target = value;
        
    StopCoroutine("Movement");
    StartCoroutine("Movement", target);
}

function Movement (target : Vector3)
{
    while(Vector3.Distance(transform.position, target) > 0.05f)
    {
        transform.position = Vector3.Lerp(transform.position, target, smoothing * Time.deltaTime);
        
        yield;
    }
}
import UnityEngine
import System.Collections


public class PropertiesAndCoroutines(MonoBehaviour):

    public smoothing as single = 7.0F

    public Target as Vector3:
        get:
            return target
        set:
            target = value
            
            StopCoroutine('Movement')
            StartCoroutine('Movement', target)

    
    
    private target as Vector3

    
    
    private def Movement(target as Vector3) as IEnumerator:
        while Vector3.Distance(transform.position, target) > 0.05000000075F:
            transform.position = Vector3.Lerp(transform.position, target, (smoothing * Time.deltaTime))
            
            yield null

ClickSetPosition

Code snippet

using UnityEngine;
using System.Collections;

public class ClickSetPosition : MonoBehaviour
{
    public PropertiesAndCoroutines coroutineScript;
    
    
    void OnMouseDown ()
    {
        Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);
        RaycastHit hit;
        
        Physics.Raycast(ray, out hit);
        
        if(hit.collider.gameObject == gameObject)
        {
            Vector3 newTarget = hit.point + new Vector3(0, 0.5f, 0);
            coroutineScript.Target = newTarget;
        }
    }
}
#pragma strict

public var coroutineScript : PropertiesAndCoroutines;
    

function OnMouseDown ()
{
    var ray : Ray = Camera.main.ScreenPointToRay(Input.mousePosition);
    var hit : RaycastHit;
    
    Physics.Raycast(ray, hit);
    
    if(hit.collider.gameObject == gameObject)
    {
        var newTarget : Vector3 = hit.point;
        coroutineScript.SetTarget(newTarget);
    }
}
import UnityEngine
import System.Collections


public class ClickSetPosition(MonoBehaviour):

    public coroutineScript as PropertiesAndCoroutines

    
    
    private def OnMouseDown():
        ray as Ray = Camera.main.ScreenPointToRay(Input.mousePosition)
        hit as RaycastHit
        
        Physics.Raycast(ray, hit)
        
        if hit.collider.gameObject == gameObject:
            newTarget as Vector3 = (hit.point + Vector3(0, 0.5F, 0))
            coroutineScript.Target = newTarget

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