Create a coroutine to fade out different types of object
Hi I'm trying to create a coroutine in unity that will handle fading on all manner of object. So far I'm able to get the alpha values of the different types I want but I'm at a dead end as to how to set the new color after lerping it. Here is my code :
public static IEnumerator FadeTo(float aValue, float aTime,GameObject gameObj)
{
Component[] allComponents = gameObj.GetComponents(typeof(Component));
Component fadableComponent;
Type type = null;
float alpha=0;
foreach(Component c in allComponents)
{
if(c.GetType()==typeof(Image))
{
fadableComponent = c;
alpha = fadableComponent.GetComponent<Image>().color.a;
type = fadableComponent.GetType();
Debug.Log("Found a image");
break;
}
if (c.GetType() == typeof(Renderer))
{
fadableComponent = c;
alpha = fadableComponent.GetComponent<Renderer>().material.color.a;
type = fadableComponent.GetType();
break;
}
if (c.GetType() == typeof(SpriteRenderer))
{
fadableComponent = c;
alpha = fadableComponent.GetComponent<SpriteRenderer>().color.a;
type = fadableComponent.GetType();
break;
}
if(c.GetType()== typeof(CanvasGroup))
{
fadableComponent = c;
alpha = fadableComponent.GetComponent<CanvasGroup>().alpha;
type = fadableComponent.GetType();
}
Debug.Log(alpha.ToString());
}
for (float t = 0.0f; t < 1.0f; t += Time.deltaTime / aTime)
{
Color newColor = new Color(1, 1, 1, Mathf.Lerp(alpha, aValue, t));
gameObj.transform.GetComponent(type) // What now ?!
yield return null;
}
yield return null;
}
}
Now i know how to do this with lets say another set of if's or what not, but I want to avoid that. For example of solutions I want to avoid I took a look at the iTween implementation. Here is a perfect example of what I want to avoid:
if(target.GetComponent<GUITexture>()){
target.GetComponent<GUITexture>().color=colors[3];
}else if(target.GetComponent<GUIText>()){
target.GetComponent<GUIText>().material.color=colors[3];
}else if(target.GetComponent<Renderer>()){
target.GetComponent<Renderer>().material.color=colors[3];
}else if(target.GetComponent<Light>()){
target.GetComponent<Light>().color=colors[3];
}
This is a mess, moms spaghetti. Extending this will be a nightmare.
It could be you're looking for
Tweeng
The crack cocaine of game programming!
The basic syntax is
time.Tweeng( do something )
so (in pseudocode)
StartCoroutine( 2f.Tweeng( .. move the ball .. ) );
StartCoroutine( .5f.Tweeng( .. spin the spaceship .. ) );
StartCoroutine( 1f.Tweeng( .. fade the text .. ) );
Those examples are,
- move the ball over two seconds
- spin the spaceship in 1/2 second
- fade the text over one second.
More...
// tweeng z to 20 degrees in .12 seconds
StartCoroutine(.12f.Tweeng( (t)=>transform.Eulers(0f,0f,t), 0f,20f) );
// fade in alpha in .75 seconds
StartCoroutine(.75f.Tweeng( (u)=>{c.a=u;s.color=c;}, 0f,1f) );
// duck volume..
StartCoroutine( .3f.Tweeng( x=>{current.volume=x;}, current.volume, 0f) );
// move something..
StartCoroutine(secs.Tweeng( (p)=>parked.transform.position=p,
parked.transform.position,
landing.transform.position) );
// twist image
yield return StartCoroutine( .3f.Tweeng(
(u)=>polaroid.localEulerAngles = new Vector3(0f,0f,u),
0f,9f) );
You can Tweeng anything, certainly including fades.
Basic code base for Tweeng :
Just put this in a file Extns.cs:
public static class Extns
{
public static IEnumerator Tweeng( this float duration,
System.Action<float> var, float aa, float zz )
{
float sT = Time.time;
float eT = sT + duration;
while (Time.time < eT)
{
float t = (Time.time-sT)/duration;
var( Mathf.SmoothStep(aa, zz, t) );
yield return null;
}
var(zz);
}
public static IEnumerator Tweeng( this float duration,
System.Action<Vector3> var, Vector3 aa, Vector3 zz )
{
float sT = Time.time;
float eT = sT + duration;
while (Time.time < eT)
{
float t = (Time.time-sT)/duration;
var( Vector3.Lerp(aa, zz, Mathf.SmoothStep(0f, 1f, t) );
yield return null;
}
var(zz);
}
}
(Note that those examples include smoothing. You may need no-smoothing in some cases. In fact, in projects now we always have both "Tweeng" and "SmoothedTweeng".)
(If you're interested, you can use a generics approach - fascinating QA on that.)
Tweeng - it could save your life!
FYI regarding this specific question:
Be aware of crossFadeAlpha
, recently added to Unity. It is confusing but it can work well. Be aware that canvas renderers always have an alpha.
public static class MoExtensions
{
public static void FadeIn(this Graphic g)
{
g.GetComponent<CanvasRenderer>().SetAlpha(0f);
g.CrossFadeAlpha(1f,.15f,false);
}
public static void FadeOut(this Graphic g)
{
g.GetComponent<CanvasRenderer>().SetAlpha(1f);
g.CrossFadeAlpha(0f,.15f,false);
}