# gc:setAlpha

setAlpha is a function that is part of gc.

Sets how transparent the next graphical things displayed will be.

This has been introduced in TI-Nspire OS 3.0 (Changes).

Will probably not exist/work on future versions, since this is Undocumented/Unofficial !

## Syntax

gc:setAlpha(alpha)

Parameter Type Description
alpha
number an integer, from 0 to 255

## Example

function on.paint(gc)
gc:setAlpha(0)
gc:drawString("hello",10,10,"top") -- will be invisible
gc:setAlpha(127)
gc:drawString("hello",50,50,"top") -- will be half-visible
gc:setAlpha(255)
gc:drawString("hello",100,100,"top") -- will be fully-visible
end