[NTG-context] Left frame on a block of text

Aditya Mahajan adityam at umich.edu
Sat Apr 20 15:46:00 CEST 2019

On Sat, 20 Apr 2019, Gilles Waeber wrote:

> Hi,
> I'm trying to create a style with a left border in the margin.
> I want the border to start and stop with the text. For the bottom I used
> framedepth but the bar still goes too far on the top?
> \showframe
> \showboxes
> \defineframedtext[leftbartext][
> 	width=broad,
> 	frame=off,
> 	leftframe=on,
> 	rulethickness=.5ex,
> 	offset=-\framedparameter{rulethickness},
> 	frameoffset=\dimexpr\leftmargindistance +
> \framedparameter{rulethickness}\relax,
> 	framedepth=-\framedparameter{frameoffset},
> ]
> \starttext
> \startleftbartext
> \input knuth
> \stopleftbartext
> \stoptext

Framed does not provide enough hooks to control the spaces. For something 
like this, you can also use metapost to draw the background:



   draw leftboundary OverlayBox
         xshifted -(LeftMarginDistance + 0.5OverlayLineWidth)
         withpen pencircle scaled OverlayLineWidth;
   setbounds currentpicture to OverlayBox;

\input knuth


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