question about followtext in MP

question about followtext in MP

[Pablo Rodriguez]

Dear list,

I have the following sample:

    \starttext
    \startMPcode
       path p ; p := reverse halfcircle scaled 5cm;
       path q ; q := reverse halfcircle rotatedaround (origin, 180)
           scaled 5cm ;
       draw p;
       draw q;
       draw followtext(p, "·Just follow the tokens") ;
       draw followtext(q, "Just follow the tokens·") ;
       draw followtext(reverse q, "Just follow the tokens·") ;
      \stopMPcode
    \stoptext

Is there any way to followtext in q without changing text direction?

I need to write the text counter-clockwise, but on outside of the path.

Reverse changes both text direction and side of the text (related to the
path) and I don’t want to change text direction.

Many thanks for your help,

Pablo
-- 
http://www.ousia.tk
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Re: question about followtext in MP

[Hans Hagen]

On 5/22/2018 9:05 PM, Pablo Rodriguez wrote:
> Dear list,
> 
> I have the following sample:
> 
>      \starttext
>      \startMPcode
>         path p ; p := reverse halfcircle scaled 5cm;
>         path q ; q := reverse halfcircle rotatedaround (origin, 180)
>             scaled 5cm ;
>         draw p;
>         draw q;
>         draw followtext(p, "·Just follow the tokens") ;
>         draw followtext(q, "Just follow the tokens·") ;
>         draw followtext(reverse q, "Just follow the tokens·") ;
>        \stopMPcode
>      \stoptext
> 
> Is there any way to followtext in q without changing text direction?
> 
> I need to write the text counter-clockwise, but on outside of the path.
> 
> Reverse changes both text direction and side of the text (related to the
> path) and I don’t want to change text direction.
it will probably always look bad

     \startMPcode
        path p ; p := reverse halfcircle scaled (5cm + 0.5LineHeight);
        path q ; q := reverse halfcircle rotatedaround (origin, 180)
            scaled (5cm +1.3LineHeight);
        draw fullcircle scaled 5cm;;
        draw followtext(p, "\strut just follow the tokens\enspace") ;
        draw followtext(reverse q, "\strut just follow the 
tokens\enspace") ;
       \stopMPcode


-----------------------------------------------------------------
                                           Hans Hagen | PRAGMA ADE
               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
        tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl
-----------------------------------------------------------------
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Re: question about followtext in MP

[Pablo Rodriguez]

On 05/22/2018 10:22 PM, Hans Hagen wrote:
> On 5/22/2018 9:05 PM, Pablo Rodriguez wrote:
>> Dear list,
>> [...]
>> Is there any way to followtext in q without changing text direction?
>>
>> I need to write the text counter-clockwise, but on outside of the path.
>>
>> Reverse changes both text direction and side of the text (related to the
>> path) and I don’t want to change text direction.
> it will probably always look bad
> 
>      \startMPcode
>         path p ; p := reverse halfcircle scaled (5cm + 0.5LineHeight);
>         path q ; q := reverse halfcircle rotatedaround (origin, 180)
>             scaled (5cm +1.3LineHeight);
>         draw fullcircle scaled 5cm;;
>         draw followtext(p, "\strut just follow the tokens\enspace") ;
>         draw followtext(reverse q, "\strut just follow the 
> tokens\enspace") ;
>        \stopMPcode

Many thanks for your reply, Hans.

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.

Many thanks for your help,

Pablo
-- 
http://www.ousia.tk
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Re: question about followtext in MP

[Hans Hagen]

On 5/23/2018 5:50 PM, Pablo Rodriguez wrote:
> On 05/22/2018 10:22 PM, Hans Hagen wrote:
>> On 5/22/2018 9:05 PM, Pablo Rodriguez wrote:
>>> Dear list,
>>> [...]
>>> Is there any way to followtext in q without changing text direction?
>>>
>>> I need to write the text counter-clockwise, but on outside of the path.
>>>
>>> Reverse changes both text direction and side of the text (related to the
>>> path) and I don’t want to change text direction.
>> it will probably always look bad
>>
>>       \startMPcode
>>          path p ; p := reverse halfcircle scaled (5cm + 0.5LineHeight);
>>          path q ; q := reverse halfcircle rotatedaround (origin, 180)
>>              scaled (5cm +1.3LineHeight);
>>          draw fullcircle scaled 5cm;;
>>          draw followtext(p, "\strut just follow the tokens\enspace") ;
>>          draw followtext(reverse q, "\strut just follow the
>> tokens\enspace") ;
>>         \stopMPcode
> 
> Many thanks for your reply, Hans.
> 
> 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)

you can alway sdo

currentpicture := currentpicture shifted - center currentpicture;

-----------------------------------------------------------------
                                           Hans Hagen | PRAGMA ADE
               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
        tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl
-----------------------------------------------------------------
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Re: question about followtext in MP

[Alan Braslau]

On Wed, 23 May 2018 18:05:07 +0200
Hans Hagen <j.hagen@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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Re: question about followtext in MP

[Pablo Rodriguez]

On 05/23/2018 06:05 PM, Hans Hagen wrote:
> On 5/23/2018 5:50 PM, Pablo Rodriguez wrote:
>>
>> Many thanks for your reply, Hans.
>>
>> 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)
> 
> you can alway sdo
> 
> currentpicture := currentpicture shifted - center currentpicture;

Many thanks for your replies, Hans and Alan.

Geometry isn’t one of my strengths (and this is almost my first contact
with MP).

I have the following sample:

  \starttext
  \edef\TextInside{Just follow the tokens}
  \startMPpage
    path p ; p := reverse halfcircle scaled .6TextWidth;
    path q ; q := halfcircle rotatedaround (origin, 180)
        scaled (.6TextWidth + .75LineHeight);
    %~ draw fullcircle scaled .6TextWidth;
    draw followtext(p, "·\TextInside") ;
    draw followtext(q, "\TextInside·") ;
    path c ; c := (origin -- (6, 0) -- (0.5, -4) -- (3, 2) --
        (5.5, -4) -- cycle) scaled 1.25cm ;
    %~ c := c shifted (-3,-3) ;
    draw followtext(c, "\dorecurse{500}{\utfchar{"EB09}}") ;
  \stopMPpage
  \stoptext

How can I shift the path c (I mean, the one that draws a star?

I have tried to add the shifted option to the path definition and
drawing and there was no shift in the MP page.

Many thanks for your help,

Pablo
-- 
http://www.ousia.tk
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Re: question about followtext in MP

[Alan Braslau]

On Wed, 23 May 2018 18:40:14 +0200
Pablo Rodriguez <oinos@gmx.es> wrote:

> I have the following sample:
> 
>   \starttext
>   \edef\TextInside{Just follow the tokens}
>   \startMPpage
>     path p ; p := reverse halfcircle scaled .6TextWidth;
>     path q ; q := halfcircle rotatedaround (origin, 180)
>         scaled (.6TextWidth + .75LineHeight);
>     %~ draw fullcircle scaled .6TextWidth;
>     draw followtext(p, "·\TextInside") ;
>     draw followtext(q, "\TextInside·") ;
>     path c ; c := (origin -- (6, 0) -- (0.5, -4) -- (3, 2) --
>         (5.5, -4) -- cycle) scaled 1.25cm ;
>     %~ c := c shifted (-3,-3) ;
>     draw followtext(c, "\dorecurse{500}{\utfchar{"EB09}}") ;
>   \stopMPpage
>   \stoptext
> 
> How can I shift the path c (I mean, the one that draws a star?
> 
> I have tried to add the shifted option to the path definition and
> drawing and there was no shift in the MP page.

(If you only have one MPpage, then there is no need for \starttext\stoptext).

  \edef\TextInside{Just follow the tokens}
  \startMPpage
    path p ; p := reverse halfcircle scaled .6TextWidth;
    path q ; q := halfcircle rotatedaround (origin, 180)
        scaled (.6TextWidth + .75LineHeight);
    %~ draw fullcircle scaled .6TextWidth;
    draw followtext(p, "·\TextInside") ;
    draw followtext(q, "\TextInside·") ;
    path s ; s := (dir30--dir150--dir315--dir90--dir225--cycle) scaled .3TextWidth ;
    for i=0 upto 500 :
      draw textext("\utfchar{"EB09}") scaled .5
        shifted point (i/500*length s) of s ;
    endfor
  \stopMPpage
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Re: question about followtext in MP

[Pablo Rodriguez]

On 05/23/2018 07:19 PM, Alan Braslau wrote:
> On Wed, 23 May 2018 18:40:14 +0200 Pablo Rodriguez wrote:
>>
>> I have tried to add the shifted option to the path definition and
>> drawing and there was no shift in the MP page.
> 
> (If you only have one MPpage, then there is no need for \starttext\stoptext).
> 
>   \edef\TextInside{Just follow the tokens}
>   \startMPpage
>     path p ; p := reverse halfcircle scaled .6TextWidth;
>     path q ; q := halfcircle rotatedaround (origin, 180)
>         scaled (.6TextWidth + .75LineHeight);
>     %~ draw fullcircle scaled .6TextWidth;
>     draw followtext(p, "·\TextInside") ;
>     draw followtext(q, "\TextInside·") ;
>     path s ; s := (dir30--dir150--dir315--dir90--dir225--cycle) scaled .3TextWidth ;
>     for i=0 upto 500 :
>       draw textext("\utfchar{"EB09}") scaled .5
>         shifted point (i/500*length s) of s ;
>     endfor
>   \stopMPpage

Many thanks for your help, Alan.

I didn’t know that dir even existed.

So I get a much better star that the one I tried before.

Many thanks for your help,

Pablo
-- 
http://www.ousia.tk
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Re: question about followtext in MP

[Alan Braslau]

On Wed, 23 May 2018 21:06:42 +0200
Pablo Rodriguez <oinos@gmx.es> wrote:

> On 05/23/2018 07:19 PM, Alan Braslau wrote:
> > On Wed, 23 May 2018 18:40:14 +0200 Pablo Rodriguez wrote:  
> >>
> >> I have tried to add the shifted option to the path definition and
> >> drawing and there was no shift in the MP page.  
> > 
> > (If you only have one MPpage, then there is no need for
> > \starttext\stoptext).
> > 
> >   \edef\TextInside{Just follow the tokens}
> >   \startMPpage
> >     path p ; p := reverse halfcircle scaled .6TextWidth;
> >     path q ; q := halfcircle rotatedaround (origin, 180)
> >         scaled (.6TextWidth + .75LineHeight);
> >     %~ draw fullcircle scaled .6TextWidth;
> >     draw followtext(p, "·\TextInside") ;
> >     draw followtext(q, "\TextInside·") ;
> >     path s ; s := (dir30--dir150--dir315--dir90--dir225--cycle)
> > scaled .3TextWidth ; for i=0 upto 500 :
> >       draw textext("\utfchar{"EB09}") scaled .5
> >         shifted point (i/500*length s) of s ;
> >     endfor
> >   \stopMPpage  
> 
> Many thanks for your help, Alan.
> 
> I didn’t know that dir even existed.
> 
> So I get a much better star that the one I tried before.
> 
> Many thanks for your help,
> 
> Pablo

If you are going to use MP, why not read the manual (mpman.pdf) or
better yet, refer to the MetaFun manual that is even available in
printed form at http://www.h2o-books.com/catalog/context/metafun

Alan
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Re: question about followtext in MP

[Pablo Rodriguez]

On 05/23/2018 11:24 PM, Alan Braslau wrote:
> On Wed, 23 May 2018 21:06:42 +0200
> [...]
> If you are going to use MP, why not read the manual (mpman.pdf) or
> better yet, refer to the MetaFun manual that is even available in
> printed form at http://www.h2o-books.com/catalog/context/metafun?

Alan,

paging through the manuals, Metafun seems easier than MetaPost.

I think it will take me a while to understand the basics of it.

Many thanks for your advice,

Pablo
-- 
http://www.ousia.tk
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Re: question about followtext in MP

[Alan Braslau]

On Thu, 24 May 2018 18:11:05 +0200
Pablo Rodriguez <oinos@gmx.es> wrote:

> paging through the manuals, Metafun seems easier than MetaPost.
> 
> I think it will take me a while to understand the basics of it.

Metafun is an extension to MetaPost, providing some useful tools and
improving on some "standard" MetaPost macros. But it *is* MetaPost, and
the basic syntax is unchanged.

Perhaps you are praising the MetaFun manual - that would please Hans as
he has put a lot of effort into this documentation.

Alan

P.S. MetaFun/MetaPost tends to grow upon you. I learn new things every
day, and am constantly in awe...
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Re: question about followtext in MP

[Pablo Rodriguez]

On 05/24/2018 06:30 PM, Alan Braslau wrote:
> On Thu, 24 May 2018 18:11:05 +0200 Pablo Rodriguez wrote:
> 
>> paging through the manuals, Metafun seems easier than MetaPost.
>>
>> I think it will take me a while to understand the basics of it.
> 
> Metafun is an extension to MetaPost, providing some useful tools and
> improving on some "standard" MetaPost macros. But it *is* MetaPost, and
> the basic syntax is unchanged.
> 
> Perhaps you are praising the MetaFun manual - that would please Hans as
> he has put a lot of effort into this documentation.

The Metafun manual is much clearer (way than the MetaPost manual) for a
newbie such as me.

I must confess that I don’t have the background to understand it, either
in math, or in coding.

But the manual makes me wonder how could I get some of the graphics
shown there.

> P.S. MetaFun/MetaPost tends to grow upon you. I learn new things every
> day, and am constantly in awe...

I have to learn a lot about ConTeXt and Lua before. And I agree with
you, it is addictive even for an ignorant such as myself.

I have another question (for a new thread).

Many thanks for your help,

Pablo
-- 
http://www.ousia.tk
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Re: question about followtext in MP

[Alan Braslau]

On Wed, 23 May 2018 17:50:27 +0200
Pablo Rodriguez <oinos@gmx.es> wrote:

> Is there any way to set origin to another value than (0, 0) in MP?

What does this mean, mathematically that is?

Of course, you can always shift an image anywhere (or in general apply
any transformation), thus effectively changing the origin:

currentpicture := currentpicture shifted (xx,yy) ;

Alan
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