2D Toolkit Forum

2D Toolkit => Support => Topic started by: ItsMeAlan on March 09, 2013, 12:27:42 am

Title: Dynamic opacity of animatedSprite
Post by: ItsMeAlan on March 09, 2013, 12:27:42 am

Is there a way to change how transparent a sprite is with code?

Thanks!

Title: Re: Dynamic opacity of animatedSprite
Post by: unikronsoftware on March 09, 2013, 10:37:21 am

Yup, change the alpha channel of the color property.

sprite.color = new Color (1, 1, 1, 0.5f ); // makes it 50% transparent

Title: Re: Dynamic opacity of animatedSprite
Post by: ItsMeAlan on March 14, 2013, 06:45:22 am

I'm using this:

Code: [Select]

GetComponent(tk2dSprite).color = new Color(1,1,1,myAlpha);
where myAlpha is a float that I add to or decrease from. Interestingly, this code works exactly as I want it to, but it causes a ton of errors. Specifically, this error:

Code: [Select]

NullReferenceException: Object reference not set to an instance of an object
HelpArrowScript.Update () (at Assets/Scripts/HelpArrowScript.js:23)

The line causing the error is the line I posted above. My game is having major framerate issues, so I figure this might be the culprit? Am I doing something wrong?

Title: Re: Dynamic opacity of animatedSprite
Post by: unikronsoftware on March 14, 2013, 08:14:14 am

In JS, the syntax is
GetComponent(tk2dSprite).color = Color(1,  1, 1, myAlpha);

Title: Re: Dynamic opacity of animatedSprite
Post by: ItsMeAlan on March 14, 2013, 03:15:34 pm

I took out the New but this line is still causing the same error once per frame.

Title: Re: Dynamic opacity of animatedSprite
Post by: unikronsoftware on March 14, 2013, 09:04:49 pm

What is GetComponent(tk2dSprite) returning? Do you have a sprite attached to the same gameobject the script is on?

Title: Re: Dynamic opacity of animatedSprite
Post by: ItsMeAlan on March 17, 2013, 06:30:48 am

Ah, that was it. I'd accidentally applied my script to an empty gameObject without realizing it. Thanks!