Re: [Sc-devel] Color(1.0, 1.0, 1.0) != nil

[Tom Hall <scth@xxxxxxxxxxx>]

Julian, Paul, Wouter

well spotted Paul!
it's caused by something in Wouter Snoei's wslib, extColor-web.sc

Tom


On 10 Dec 2007, at 12:23, Julian Rohrhuber wrote:
> I don#t get this.
> maybe some extension?
> what does Color:!= say?



On 5 Dec 2007, at 20:01, paul wrote:

> Hi Tom,
>
> I found the same error here and traced it back to the following  
> extension to Color in file "extColor-web.sc" in Wouter Snoei's very  
> useful library:
>
> 	!= { arg aColor;
> 		^((aColor.red != red) &&
> 		(aColor.blue != blue) &&
> 		(aColor.green != green) &&
> 		(aColor.alpha != alpha) );
> 	}
>
> This doesn't check for a nil - or any other non-Color object -  
> being passed for comparison. So it would crash with any object that  
> doesn't respond to methods red, blue, green, or alpha.
>
> If I remove wslib temporarily, then
>
> 	Color(1.0, 1.0, 1.0) != nil
>
> returns true.
>
> I'm not clear on the need for this extension, since without wslib  
> the following are correctly returned:
>
> Color(1.0, 1.0, 1.0, 1.0) != nil;		// returns true
> Color(1.0, 1.0, 1.0, 1.0) != Color(1.0, 1.0, 1.0, 1.0);		// returns  
> false
> Color(1.0, 1.0, 1.0, 1.0) != Color(0.0, 1.0, 0.0, 1.0);		// returns  
> true
> Color(1.0, 1.0, 1.0, 1.0) != Color(1.0, 0.0, 1.0, 1.0);		// returns  
> true
> Color(1.0, 1.0, 1.0, 1.0) != Color(1.0, 1.0, 0.0, 0.0);		// returns  
> true
> Color(1.0, 1.0, 1.0, 1.0) != Color(1.0, 1.0, 1.0, 0.0);		// returns  
> true
>
> but I'm probably missing something - Wouter?
>
> Cheers,
>
> Paul
>
>
> On 5 Dec 2007, at 13:30, Tom Hall wrote:
>
> > Should this cause an error?
> >
> > Color(1.0, 1.0, 1.0) != nil
> > // => ERROR: Message 'red' not understood.
> >
> > but
> > nil != Color(1.0, 1.0, 1.0) // => true
> >
> > Color(1.0, 1.0, 1.0) == nil // => false
> >
> >
> > Regards
> >
> >
> > Tom
> >
> > _______________________________________________
> > Sc-devel mailing list
> > Sc-devel@xxxxxxxxxxxxxxx
> > http://www.create.ucsb.edu/mailman/listinfo/sc-devel
>
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