Difference between revisions of "gc:setAlpha"

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Sets how transparent the next graphical things displayed will be.
 
Sets how transparent the next graphical things displayed will be.
  
 
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<br />{{Since|3.0}}
 
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{{Undocumented}}
<br /> {{Since|3.0}}. '''Will probably not exist/work on future versions, since this is [[Category:Undocumented/Unofficial]] !'''
 
  
 
==Syntax==
 
==Syntax==
Line 19: Line 18:
  
 
== Example ==  
 
== Example ==  
<syntaxhighlight>gc:setAlpha(0) -- will be invisible
+
<syntaxhighlight>function on.paint(gc)
gc:setAlpha(127) -- will be half-visible
+
    gc:setAlpha(0)
gc:setAlpha(255) -- will be fully-visible</syntaxhighlight>
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    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</syntaxhighlight>
  
 
<br /><br />
 
<br /><br />
 
[[Category:gc]]
 
[[Category:gc]]
 
[[Category:Undocumented/Unofficial]]
 
[[Category:Undocumented/Unofficial]]

Latest revision as of 22:48, 7 December 2011

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