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Subject: Re: 'debug' version of METAPOST draw?
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Would Chapter 11, section 11.1 Showing Paths of the MetaPost manual, be 
any help here?

Below is a MWE of a random path of curves and straight lines. The points 
are shown using drawpoints. The arrow path and control lines are also 
shown and are better described in the Metapost manual.

%%%%%%%%%%%%MWE%%%%%%%%%%%

\setuppapersize [A4,landscape]

\starttext

\startMPpage[instance=doublefun]

StartPage;

width := PaperWidth ; height := PaperHeight ; unit := cm ;

path p ;

path pat;

pat := (5cm,5cm);

for a = 1 step 1 until 10:

x:= uniformdeviate(10) +10;

y:= uniformdeviate(10) +10;

if odd a:

pat := pat .. (x*cm,y*cm);

else:

pat := pat -- (x*cm,y*cm);

fi;

draw pat withpen pencircle scaled 5mm withcolor .5green;

endfor;

drawarrowpath pat;

drawpoints pat;

drawcontrollines pat withcolor .625red ;

StopPage;

\stopMPpage

\stoptext

%%%%%%%%%%%%%%% end MWE %%%%%%%%%%%%%%%%%

A better coder than me may be able to incorporate it into what you require.

Best Wishes

Keith McKay

On 28/05/2020 12:33, Gerben Wierda wrote:
> I would like to be able (during development) to draw paths where the points of the path (and maybe thing slike directions) are visualised. E.g. a path where each pair in teh path is also drawn as a dot and maybe teh directions drawn as small arrows.
>
> Does someone have such a beast lying around?
>
> G
> ___________________________________________________________________________________
> If your question is of interest to others as well, please add an entry to the Wiki!
>
> maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
> webpage  : http://www.pragma-ade.nl / http://context.aanhet.net
> archive  : https://bitbucket.org/phg/context-mirror/commits/
> wiki     : http://contextgarden.net
> ___________________________________________________________________________________

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<html>
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    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
  </head>
  <body>
    <p>Would Chapter 11, section 11.1 Showing Paths of the MetaPost manual, be any help here?</p>
    <p>Below is a MWE of a random path of curves and straight lines. The points are shown using drawpoints. The arrow path and control lines are also shown and are better described in the Metapost manual.</p>
    <p>%%%%%%%%%%%%MWE%%%%%%%%%%%
</p>
    <p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;">\setuppapersize [A4,landscape]</p>
    <p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;">\starttext</p>
    <p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;">\startMPpage[instance=doublefun]</p>
    <p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;">StartPage;</p>
    <p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;">width := PaperWidth ; height := PaperHeight ; unit := cm ;</p>
    <p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;">path p ;</p>
    <p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;">path pat;</p>
    <p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;">pat := (5cm,5cm);</p>
    <p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;">for a = 1 step 1 until 10:</p>
    <p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;">x:= uniformdeviate(10) +10;</p>
    <p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;">y:= uniformdeviate(10) +10;</p>
    <p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;">if odd a:</p>
    <p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;">pat := pat .. (x*cm,y*cm);</p>
    <p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;">else:</p>
    <p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;">pat := pat -- (x*cm,y*cm);</p>
    <p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;">fi;</p>
    <p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;">draw pat withpen pencircle scaled 5mm withcolor .5green;</p>
    <p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;">endfor;</p>
    <p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;">drawarrowpath pat;</p>
    <p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;">drawpoints pat;</p>
    <p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;">drawcontrollines pat withcolor .625red ;</p>
    <p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;">StopPage;</p>
    <p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;">\stopMPpage</p>
    <p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;">\stoptext</p>
    <p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;">%%%%%%%%%%%%%%% end MWE %%%%%%%%%%%%%%%%%</p>
    <p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;">
</p>
    <p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;">A better coder than me may be able to incorporate it into what you require.</p>
    <p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;">Best Wishes</p>
    <p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;">Keith McKay
</p>
    <p><style type="text/css">
p, li { white-space: pre-wrap; }</style></p>
    <div class="moz-cite-prefix">On 28/05/2020 12:33, Gerben Wierda
      wrote:<br>
    </div>
    <blockquote type="cite"
      cite="mid:7BCD7589-E126-49E9-91B9-11C8D582E040@rna.nl">
      <pre class="moz-quote-pre" wrap="">I would like to be able (during development) to draw paths where the points of the path (and maybe thing slike directions) are visualised. E.g. a path where each pair in teh path is also drawn as a dot and maybe teh directions drawn as small arrows.

Does someone have such a beast lying around?

G
___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!

maillist : <a class="moz-txt-link-abbreviated" href="mailto:ntg-context@ntg.nl">ntg-context@ntg.nl</a> / <a class="moz-txt-link-freetext" href="http://www.ntg.nl/mailman/listinfo/ntg-context">http://www.ntg.nl/mailman/listinfo/ntg-context</a>
webpage  : <a class="moz-txt-link-freetext" href="http://www.pragma-ade.nl">http://www.pragma-ade.nl</a> / <a class="moz-txt-link-freetext" href="http://context.aanhet.net">http://context.aanhet.net</a>
archive  : <a class="moz-txt-link-freetext" href="https://bitbucket.org/phg/context-mirror/commits/">https://bitbucket.org/phg/context-mirror/commits/</a>
wiki     : <a class="moz-txt-link-freetext" href="http://contextgarden.net">http://contextgarden.net</a>
___________________________________________________________________________________
</pre>
    </blockquote>
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