[NTG-context] MetaPost lines in tables?

[NTG-context] MetaPost lines in tables?

[Henning Hraban Ramm]

I guess I asked this a while ago, but I can’t find an answer:
Is it possible to replace the lines of a TABLE with my own MetaPost 
graphics?

ATM I’m trying to place my MP lines behind a frame-less TABLE; it will 
probably work, but it’s a crutch…

Hraban
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[NTG-context] Re: MetaPost lines in tables?

[Wolfgang Schuster]

Henning Hraban Ramm schrieb am 19.02.2024 um 22:39:
> I guess I asked this a while ago, but I can’t find an answer:
> Is it possible to replace the lines of a TABLE with my own MetaPost 
> graphics?
> 
> ATM I’m trying to place my MP lines behind a frame-less TABLE; it will 
> probably work, but it’s a crutch…

The example below draws a custom border for the whole cell but you're 
free to draw only certain sides (leftboundary etc. helps) but don't 
forget to set the boundary box for the graphic (OverlayBox is the size 
of the cell).

%%%% begin example
\startuseMPgraphic{dottedborder}
   draw OverlayBox withpen pencircle scaled 2 dashed withdots withcolor 
"red";
\stopuseMPgraphic

\defineoverlay[dottedborder][\useMPgraphic{dottedborder}]

\starttext

\bTABLE[frame=off,background=dottedborder]
   \bTR
     \bTD Hello Table! \eTD
   \eTR
\eTABLE

\stoptext
%%%% end example

Wolfgang
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[NTG-context] Re: MetaPost lines in tables?

[Henning Hraban Ramm]

Am 19.02.24 um 23:15 schrieb Wolfgang Schuster:
> Henning Hraban Ramm schrieb am 19.02.2024 um 22:39:
>> I guess I asked this a while ago, but I can’t find an answer:
>> Is it possible to replace the lines of a TABLE with my own MetaPost 
>> graphics?
>>
>> ATM I’m trying to place my MP lines behind a frame-less TABLE; it will 
>> probably work, but it’s a crutch…
> 
> The example below draws a custom border for the whole cell but you're 
> free to draw only certain sides (leftboundary etc. helps) but don't 
> forget to set the boundary box for the graphic (OverlayBox is the size 
> of the cell).
> 
> %%%% begin example
> \startuseMPgraphic{dottedborder}
>    draw OverlayBox withpen pencircle scaled 2 dashed withdots withcolor 
> "red";
> \stopuseMPgraphic
> 
> \defineoverlay[dottedborder][\useMPgraphic{dottedborder}]
> 
> \starttext
> 
> \bTABLE[frame=off,background=dottedborder]

Thank you!

Since I needed only horizontal lines, I forced the height with an 
“invisible“ line:

\startuseMPgraphic{dottedborder}
    draw (0,0)--(0,OverlayHeight) withpen pencircle scaled 0.001 
withcolor white;
    draw (0,0)--(OverlayWidth,0) withpen pencircle scaled 2 dashed 
withdots withcolor "red";
\stopuseMPgraphic

… but it would be visible on a colored background. I’m sure you can show 
me a better way…

My real life example (p.2 in https://yemaya.fiee.net/s/DEEHs5m49yftiqW) 
involves sketchy lines, and there it’s a bit annoying that the row is 
not its own frame that could get a continuous background… Well, it’s 
good enough, I’ll settle for it.

Hraban
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[NTG-context] Re: MetaPost lines in tables?

[Wolfgang Schuster]

Henning Hraban Ramm schrieb am 21.02.2024 um 19:04:
> Am 19.02.24 um 23:15 schrieb Wolfgang Schuster:
>> Henning Hraban Ramm schrieb am 19.02.2024 um 22:39:
>>> I guess I asked this a while ago, but I can’t find an answer:
>>> Is it possible to replace the lines of a TABLE with my own MetaPost 
>>> graphics?
>>>
>>> ATM I’m trying to place my MP lines behind a frame-less TABLE; it 
>>> will probably work, but it’s a crutch…
>>
>> The example below draws a custom border for the whole cell but you're 
>> free to draw only certain sides (leftboundary etc. helps) but don't 
>> forget to set the boundary box for the graphic (OverlayBox is the size 
>> of the cell).
>>
>> %%%% begin example
>> \startuseMPgraphic{dottedborder}
>>    draw OverlayBox withpen pencircle scaled 2 dashed withdots 
>> withcolor "red";
>> \stopuseMPgraphic
>>
>> \defineoverlay[dottedborder][\useMPgraphic{dottedborder}]
>>
>> \starttext
>>
>> \bTABLE[frame=off,background=dottedborder]
> 
> Thank you!
> 
> Since I needed only horizontal lines, I forced the height with an 
> “invisible“ line:
> 
> \startuseMPgraphic{dottedborder}
>     draw (0,0)--(0,OverlayHeight) withpen pencircle scaled 0.001 
> withcolor white;
>     draw (0,0)--(OverlayWidth,0) withpen pencircle scaled 2 dashed 
> withdots withcolor "red";
> \stopuseMPgraphic
> 
> … but it would be visible on a colored background. I’m sure you can show 
> me a better way…

\startuseMPgraphic{dottedborder}
   draw bottomboundary OverlayBox withpen pencircle scaled 2 dashed 
withdots withcolor "red";
   setbounds currentpicture to OverlayBox;
\stopuseMPgraphic

Wolfgang
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[NTG-context] Re: MetaPost lines in tables?

[Henning Hraban Ramm]

Am 21.02.24 um 19:43 schrieb Wolfgang Schuster:
>> … but it would be visible on a colored background. I’m sure you can 
>> show me a better way…
> 
> \startuseMPgraphic{dottedborder}
>    draw bottomboundary OverlayBox withpen pencircle scaled 2 dashed 
> withdots withcolor "red";
>    setbounds currentpicture to OverlayBox;
> \stopuseMPgraphic

Thank you!

(I’m sure I already used that somewhere… Must document…)

Hraban
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[NTG-context] Re: MetaPost lines in tables?

[Hans Hagen via ntg-context]

On 2/21/2024 7:47 PM, Henning Hraban Ramm wrote:
> Am 21.02.24 um 19:43 schrieb Wolfgang Schuster:
>>> … but it would be visible on a colored background. I’m sure you can 
>>> show me a better way…
>>
>> \startuseMPgraphic{dottedborder}
>>    draw bottomboundary OverlayBox withpen pencircle scaled 2 dashed 
>> withdots withcolor "red";
>>    setbounds currentpicture to OverlayBox;
>> \stopuseMPgraphic
> 
> Thank you!
> 
> (I’m sure I already used that somewhere… Must document…)
ok, new feature dedicated to Hraban ... who then of courese has to 
document it.

\starttext

\starttabulate
     \FL[1,2] % linefactor (old) dashfactor (new)
     \NC test \NC test and test and test and done \NC \NR
     \ML[1,1]
     \NC test \NC test and test and test and done \NC \NR
     \NC test \NC test and test and test and done \NC \NR
     \NC test \NC test and test and test and done \NC \NR
     \LL[1,10]
\stoptabulate

\framed
   [align=middle,topframe=dash,frame=off]
   {\samplefile{tufte}}

\framed
   [align=middle,
    frame=dash,
    dashstep=.01hs,
    rulethickness=1pt]
   {\samplefile{tufte}}

\framed
   [align=middle,
    frame=dash,
    dashstep=10pt,
    rulethickness=2pt,
    background=color,
    backgroundcolor=gray]
   {\samplefile{tufte}}

\stoptext


-----------------------------------------------------------------
                                           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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[NTG-context] Re: MetaPost lines in tables?

[Henning Hraban Ramm]

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Am 22.02.24 um 18:35 schrieb Hans Hagen via ntg-context:
> On 2/21/2024 7:47 PM, Henning Hraban Ramm wrote:
>> (I’m sure I already used that somewhere… Must document…)
> ok, new feature dedicated to Hraban ... who then of course has to 
> document it.

This is nice.
Thank you, will do.

(Actually I’m not much interested in dashed borders but to have lines 
affected by my sketchy style - courtesy of Aditya et al., see below)

Taco, will the syntax pages in the wiki update automatically to a newer 
version?


"""
\startuseMPgraphic{mp:sketchy}
input mp-sketch.mp;
sketchypaths;

sketch_amount := 1 + (uniformdeviate 2);
sketch_passes := 3;
sketch_segments := 2 + (uniformdeviate 3);
sketch_length := OverlayWidth / 3;

draw topboundary withpen pensquare withcolor lightgray;
naturalizepaths;
\stopuseMPgraphic

\defineoverlay[sketchylines][\useMPgraphic{mp:sketchy}]

\setupTABLE[r][first][style=bold]
\setupTABLE[r][each][
	topoffset=1em,bottomoffset=0.5em,
	background=sketchylines,
	% would be nice if the background wouldn’t start at each column
]
\setupTABLE[c][each][frame=off]
\bTABLE[]
\bTR
\bTD{Stadt}\eTD
\bTD{Land}\eTD
\bTD{Fluss}\eTD
\eTR
\dorecurse{10}{
\bTR
\bTD\strut \eTD\bTD \eTD\bTD \eTD
\eTR
}
\eTABLE
"""


Hraban

[-- Attachment #2: mp-sketch.mp --]
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%D \module
%D   [       file=mp-sketch.mp
%D        version=2021.05.13
%D          title=\CONTEXT\ \METAPOST\ graphics,
%D       subtitle=Sketch drawing,
%D         author=Aditya Mahajan,
%D           date=\currentdate,
%D      copyright={Aditya Mahajan}]

%D This metapost module is inspired by a TeX.SE question:
%D http://tex.stackexchange.com/q/39296/323
%D
%D I thought that it would be fun to implement a similar feature in MetaPost.
%D
%D To use this package in MetaPost:
%D
%D \starttyping
%D    input mp-sketch;
%D
%D    beginfig(1)
%D      sketchypaths; % Make draw and fill sketchy
%D      ...
%D      naturalizepaths; % Restore the value of draw and fill
%D      ...
%D    endfig
%D \stoptyping
%D
%D The code is heavily inspired by Hans Hagen's Metafun macros.
%D
%D The macro \type{sketchypaths} is modeled after \type{visualizepaths} from
%D \filename{mp-tool}.

def sketchypaths =
    let draw = sketchdraw ;
    let fill = sketchfill ;
enddef ;

%D Check if \filename{mp-tool} is loaded
if not known context_tool :
  let normaldraw = draw;
  let normalfill = fill;

  def naturalizepaths =
      let fill = normalfill ;
      let draw = normaldraw ;
  enddef ;
fi

%D The variable \type{sketch_amount} determines the amount of randomness in the
%D drawing
numeric sketch_amount; sketch_amount := 0.75bp;

%D The variable \type{sketch_passes} determines the number of times the path
%D is drawn
numeric sketch_passes; sketch_passes := 1;

%D Based on \type{randomized}. Assumes p is path:
numeric sketch_segments; sketch_segments := 20;

%D Length (time) of line segments:
numeric sketch_length; sketch_length := 5mm;

primarydef p sketchrandomized s = (
    if path p :
        for t = 0 step 1/sketch_segments until 1-1/sketch_segments :
            ((point       (t*arclength(p))                     on p) randomshifted s) .. controls
            ((postcontrol (t*arclength(p))                     on p) randomshifted s) and
            ((precontrol  ((t+1/sketch_segments)*arclength(p)) on p) randomshifted s) ..
        endfor
        % TODO: beide Ansätze kombinieren. Eckpunkte erhalten!

%        for t = 0 step sketch_length until arclength p:
%          (point (arctime t of p) of p) randomshifted s ..
%        endfor
        if cycle p : % funktioniert nicht
          cycle
        else :
          ((point       (arclength(p))                     on p) randomshifted s)
          %(point (arctime t of p) of p) randomshifted s
        fi
    else :
        p
    fi
) enddef ;



%D The macro \type{sketchdraw} draws the randomized path. The
%D \type{expr} ... \type{text} trick is copied from the definition of
%D \type{drawarrow}
def sketchdraw expr p =
   do_sketchdraw(p)
enddef;

def do_sketchdraw(expr p) text t =
  if (path p) :
      for i = 1 upto max(1,sketch_passes) :
        normaldraw p
                   sketchrandomized sketch_amount
                   withtransparency ("multiply", 1/max(1,sketch_passes))
                   t ;
      endfor;
  else :
      normaldraw p t;
  fi
enddef;

%D The macro \type{sketchfill} randomizes the path before filling it.
def sketchfill expr p =
  do_sketchfill(p)
enddef ;

def do_sketchfill(expr p) text t =
  if (path p) :
      for i = 1 upto max(1,sketch_passes) :
        normalfill p
                   sketchrandomized sketch_amount
                   withtransparency ("multiply", 1/max(1,sketch_passes))
                   t ;
      endfor;
  else :
      normalfill p t;
  fi
enddef;

picture NoisePattern;
NoisePattern := image(
  pickup pencircle xyscaled 0.5bp;
  numeric pmax ; pmax := 7 ;
  numeric x ; numeric y ;
	for i = 1 upto pmax:
		for j = 1 upto pmax:
      % try to get more dots in the center
      x := (i - (pmax/2) * (uniformdeviate 2.5)); % we use a wide pen
      y := (j - (pmax/2)) * (uniformdeviate 1.25);
      draw (x, y) withcolor "LineColor" withtransparency ("normal", (uniformdeviate 0.33));
		endfor
	endfor
);

numeric brush_length ; brush_length := 20 ;
%numeric brush_width ; brush_width := 0.5 ;

picture BrushPattern;

def makeBrush(expr brush_width) =
  BrushPattern := image(
    naturalizepaths;
    pickup pensquare xyscaled 0.25bp;
    numeric xmax, ymax, dev ;
    ymax := 7 ;
    xmax := round(ymax/2 * brush_width);
    numeric x ; numeric y ;
  	for i = 1 upto xmax:
  		for j = 1 upto ymax:
        x := (i - (xmax/2));
        y := (j - (ymax/2)); % * (uniformdeviate 1.25);
        dev := (uniformdeviate 1)-0.5;
        draw (x-dev, y-(uniformdeviate brush_length))--(x+dev, y+(uniformdeviate brush_length)) withcolor "LineColor" withtransparency ("normal", (uniformdeviate 0.25));
  		endfor
  	endfor
  );
enddef;

numeric noise_steps ; noise_steps := 150;
numeric nrush_steps ; brush_steps := 30;

def noisify(expr p) =
  for i = 0 step 1/noise_steps until length p:
  	draw NoisePattern randomized 1 shifted point i of p ;
  endfor
enddef;

def brushify(expr p, w) =
  makeBrush(w);
  for i = 0 step 1/brush_steps until length p:
  	draw BrushPattern randomized 1 rotated (90 + angle direction i of p) shifted point i of p ;
  endfor
enddef;

endinput;

% Modified example from
% http://tex.loria.fr/prod-graph/zoonekynd/metapost/metapost.html

beginfig(1)
  pair A,B,C,O;
  A=(0,0); B=(3cm,0); C=(1cm,2cm);

  O - 1/2[B,C] = whatever * (B-C) rotated 90;
  O - 1/2[A,B] = whatever * (A-B) rotated 90;

  sketchypaths;
  sketch_amount := 5bp;
  draw A--B--C--cycle;

  draw O withpen pencircle scaled 4bp;

  sketch_amount := 2bp;
  draw fullcircle scaled 2abs(O-A) shifted O;
endfig

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