Re: shading in metapost

["Thomas A. Schmitz" <thomas.schmitz@uni-bonn.de>]

On Jan 24, 2008, at 9:03 AM, Aditya Mahajan wrote:

> Hi Thomas,
>
> On Thu, 24 Jan 2008, Thomas A. Schmitz wrote:
>>

>>  I wanted to be clever and do it in a
>> for-loop like this:
>>
>> for i=1 upto 10:
>> 	pickup pencircle scaled (i*0.5) pt ;
>> 	draw fullcircle scaled 5mm withcolor transparent (1,0.04,black) ;
>> endfor ;
>>
>> Is this because the expression "pencircle scaled" expects a "numeric
>> primary" as argument? And is there any way around this?
>
> scaled expects a dimension. (i*0.5)pt is not a dimension. You need to
> either write (i*0.5pt) or ((i*0.5)*1pt). The extra parenthesis are  
> needed
> to keep the metapost parser happy.
>
> Aditya
>

Hi Aditya,

arrrrgh. So easy - and I had no idea how to do it. Works perfectly!  
I'm glad I'm in the humanities and not in engineering; my bridges  
would collapse real soon... Thanks so much; this loop looks so much  
nicer than having ten lines of code doing the same circle all over  
again!

All best

Thomas
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