[NTG-context] question about followtext in MP

Alan Braslau braslau.list at comcast.net
Wed May 23 18:34:35 CEST 2018


On Wed, 23 May 2018 18:05:07 +0200
Hans Hagen <j.hagen at xs4all.nl> wrote:

> > Is there any way to set origin to another value than (0, 0) in MP?
> > 
> > I realize it might sound weird, but it would make things easier in
> > an example that I’m working on.  
> redefining origin is a bad idea (don't expect help if you do that)

pair origin ; origin = (0,0) ;
is used in many places in the MP macros, and redefining this "constant"
would cause all sorts of problems, as Hans indicates.

> you can alway sdo
> 
> currentpicture := currentpicture shifted - center currentpicture;

I do this a lot, but recognize that it only makes a difference with
respect to subsequent drawing actions: The MP graphic, when "sent back"
to ConTeXt is treated as a box (defined by its bounding box) and placed
by ConTeXt according to its context (no pun intended)!

One could always play with this bounding box for interesting effects:

setbounds currentpicture to ((bbox currentpicture) shifted (xx,yy)) ;

for example.

Alan


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