[NTG-context] Metapost and TikZ color code equivalent

[Hans Hagen]

On 2/15/2020 12:25 PM, Fabrice Couvreur wrote:
> Hi Henri,
> Why does the blue path not rotate 90 with the draw command but rotate 
> with the fill command?

compare

     draw  origin -- (0,0.2cm) -- (4cm,0.2cm) -- (4cm,0) -- 
(4.1cm,-0.05cm) -- (0.1cm,-0.05cm) -- cycle  rotated alpha withcolor red;
     draw (origin -- (0,0.2cm) -- (4cm,0.2cm) -- (4cm,0) -- 
(4.1cm,-0.05cm) -- (0.1cm,-0.05cm) -- cycle) rotated alpha withcolor blue;



> \startMPcode
> 
>    def match (expr alpha, pos) =
>      fill unitsquare xscaled 4cm  yscaled 0.2cm rotated alpha shifted pos
>      withcolor yellow ;
>      fill origin -- (4cm,0) -- (4.1cm,-0.05cm) --  (0.1cm,-0.05cm) --
>      cycle rotated alpha withcolor(.6yellow + black);
>      draw origin -- (0,0.2cm) -- (4cm,0.2cm) -- (4cm,0) -- (4.1cm,-0.05cm)
>      -- (0.1cm,-0.05cm) -- cycle rotated alpha withcolor blue;
>       draw origin -- (0,0.2cm) -- (4cm,0.2cm) -- (4cm,0) -- (4.1cm,-0.05cm)
>      -- (0.1cm,-0.05cm) -- cycle rotated alpha withcolor blue;
>      draw fullcircle xscaled 0.50cm yscaled 0.44cm shifted (4.125cm,0.1cm)
>      rotated alpha;
>      draw fullcircle xscaled 0.50cm yscaled 0.44cm shifted (4.125cm,0.1cm)
>      rotated alpha
>      withshademethod "circular 1"
>      withshadevector (0,1)
>      withshadecolors (red,white);
>      enddef;
>    match(0,(0,0));
>    match(90,(4.2cm,0));
>    match(90,(0,0));
>    match(0,(0,4.2cm));
> 
> \stopMPcode-----------------------------------------------------------------
                                           Hans Hagen | PRAGMA ADE
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