[Rd] Macintosh Transperancy (PR#11511)

[Simon Urbanek]

Brad,

can you, please, let us know what is the "bug" here? If you paint semi- 
transparent line over the same filled shape (same vertices), clearly  
half of the line will be inside and and half outside of the shape, so  
each part will have a different color - that is the whole point of  
semi-transparency. Therefore I fail to see any bug or unexpected  
behavior here.

Cheers,
Simon


On May 24, 2008, at 10:55 AM, brdvance at gmail.com wrote:

> Full_Name: Brad Vance
> Version: 2.7.0
> OS: 10.5.2
> Submission from: (NULL) (71.123.195.202)
>
>
> Problem : When drawing transperant points with lines thick- 
> lines(lwd>1) + fill
> (pch=21-25), it looks like the line is transperantly overlayed over  
> the fill,
> making it look like 2-lines surround the fill (each a different  
> color).  I
> actually think that this is a nice OPTIONAL way to draw the points  
> (even as
> default), but since I could not discover how to turn it off, I  
> decided to issue
> the ticket.  In this option can see on the default-quartz device as  
> well as
> PDF-device.
>
> Solution : Have the entire point-object designed/drawn as if there is
> no-transparency, then make the composite object transparent.    
> Optionally figure
> out an option to determine whether to apply transperancy as a group  
> (to the
> entire object) or separately (as it is now).
>
> Code :
>> df <- data.frame(X=rnorm(50),Y=rnorm(50))
>> plot 
>> (X 
>> ~ 
>> Y 
>> ,data 
>> =df,pch=c(21,22,23,24,25),cex=5,col="#00FF0055",bg="#FF000055",lwd=6)
>
> Thanks,
> -Brad Vance
>
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