[NTG-context] Radius attribute and scaling in lmt_shade[ ]

Keith McKay mckaymeister at gmail.com
Thu Jan 6 16:57:01 CET 2022


Hi

In the code below you will see that I have created a closed path and 
performed scaling, and shading on the path with lmt_shade [ ]. I have 
noticed a few features which may or may not be bugs depending on whether 
scaled is applied to the path within the square brackets or outside.

1) Applying scaled to the path within the square brackets and 
incrementing the radius key I can see the shaded areas changing, however 
the first two shapes show incorrect scaling and have ragged edges.

2) When scaled is applied outside the square brackets all shapes are the 
same size and no ragged edges, however the shading is not showing 
correctly with increasing radius.

Am I missing something?

Best Wishes

Keith McKay

*******************MWE*****************

\setuppapersize[A4, landscape]

\starttext

\dorecurse{10}{

\startMPpage

StartPage;

width := 27; height := 18;

path r;

r := (0.25cm,0cm)--(0cm,1.5cm)..(0.25cm,1.75cm)..(0.5cm,1.5cm) -- cycle;

definecolor [ name = "MyColor1", r = uniformdeviate(1), g = 
uniformdeviate(1), b = uniformdeviate(1) ] ;

definecolor [ name = "MyColor2", r = uniformdeviate(1), g = 
uniformdeviate(1), b = uniformdeviate(1) ] ;

     for k = 0.5 step 0.25 until 2:

         draw lmt_shade [

             path = r ,

             direction = "up",

             alternative = "circular",

             radius = k*cm,

             colors = { "MyColor1", "MyColor2" },

             ] scaled 4.5 shifted((k *12)*cm,12*cm);

         draw lmt_shade [

             path = r scaled 4.5,

             direction = "up",

             alternative = "circular",

             radius = k*cm,

             colors = { "MyColor1", "MyColor2" },

             ] shifted((k *12)*cm,1cm);

endfor;

StopPage;

\stopMPpage

}

\stoptext
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