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Subject: Radius attribute and scaling in lmt_shade[ ]
Date: Thu, 6 Jan 2022 15:57:01 +0000
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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

--------------OWiPvxBd0R7p3tsnkbnBBl4h
Content-Type: text/html; charset=UTF-8
Content-Transfer-Encoding: 8bit

<html>
  <head>

    <meta http-equiv="content-type" content="text/html; charset=UTF-8">
  </head>
  <body>
    <p>Hi</p>
    <p>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.</p>
    <p>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.</p>
    <p>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.<br>
    </p>
    <p>Am I missing something?</p>
    <p>Best Wishes</p>
    <p>Keith McKay</p>
    <p>*******************MWE*****************<br>
    </p>
    <p>\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;
      line-height:100%;">\starttext</p>
    <p style=" margin-top:0px; margin-bottom:0px; margin-left:0px;
      margin-right:0px; -qt-block-indent:0; text-indent:0px;
      line-height:100%;">\dorecurse{10}{</p>
    <p style=" margin-top:0px; margin-bottom:0px; margin-left:0px;
      margin-right:0px; -qt-block-indent:0; text-indent:0px;
      line-height:100%;">\startMPpage</p>
    <p style=" margin-top:0px; margin-bottom:0px; margin-left:0px;
      margin-right:0px; -qt-block-indent:0; text-indent:0px;
      line-height:100%;">StartPage;</p>
    <p style=" margin-top:0px; margin-bottom:0px; margin-left:0px;
      margin-right:0px; -qt-block-indent:0; text-indent:0px;
      line-height:100%;">width := 27; height := 18; <br>
    </p>
    <p style=" margin-top:0px; margin-bottom:0px; margin-left:0px;
      margin-right:0px; -qt-block-indent:0; text-indent:0px;
      line-height:100%;">path r;</p>
    <p style=" margin-top:0px; margin-bottom:0px; margin-left:0px;
      margin-right:0px; -qt-block-indent:0; text-indent:0px;
      line-height:100%;">r :=
      (0.25cm,0cm)--(0cm,1.5cm)..(0.25cm,1.75cm)..(0.5cm,1.5cm) --
      cycle;</p>
    <p style=" margin-top:0px; margin-bottom:0px; margin-left:0px;
      margin-right:0px; -qt-block-indent:0; text-indent:0px;
      line-height:100%;">definecolor [ name = "MyColor1", r =
      uniformdeviate(1), g = uniformdeviate(1), b = uniformdeviate(1) ]
      ;</p>
    <p style=" margin-top:0px; margin-bottom:0px; margin-left:0px;
      margin-right:0px; -qt-block-indent:0; text-indent:0px;
      line-height:100%;">definecolor [ name = "MyColor2", r =
      uniformdeviate(1), g = uniformdeviate(1), b = uniformdeviate(1) ]
      ;</p>
    <p style=" margin-top:0px; margin-bottom:0px; margin-left:0px;
      margin-right:0px; -qt-block-indent:0; text-indent:0px;
      line-height:100%;">    for k = 0.5 step 0.25 until 2: </p>
    <p style=" margin-top:0px; margin-bottom:0px; margin-left:0px;
      margin-right:0px; -qt-block-indent:0; text-indent:0px;
      line-height:100%;">         draw lmt_shade [</p>
    <p style=" margin-top:0px; margin-bottom:0px; margin-left:0px;
      margin-right:0px; -qt-block-indent:0; text-indent:0px;
      line-height:100%;">             path = r ,</p>
    <p style=" margin-top:0px; margin-bottom:0px; margin-left:0px;
      margin-right:0px; -qt-block-indent:0; text-indent:0px;
      line-height:100%;">             direction = "up",</p>
    <p style=" margin-top:0px; margin-bottom:0px; margin-left:0px;
      margin-right:0px; -qt-block-indent:0; text-indent:0px;
      line-height:100%;">             alternative = "circular",</p>
    <p style=" margin-top:0px; margin-bottom:0px; margin-left:0px;
      margin-right:0px; -qt-block-indent:0; text-indent:0px;
      line-height:100%;">             radius = k*cm,</p>
    <p style=" margin-top:0px; margin-bottom:0px; margin-left:0px;
      margin-right:0px; -qt-block-indent:0; text-indent:0px;
      line-height:100%;">             colors = { "MyColor1", "MyColor2"
      },</p>
    <p style=" margin-top:0px; margin-bottom:0px; margin-left:0px;
      margin-right:0px; -qt-block-indent:0; text-indent:0px;
      line-height:100%;">             ] scaled 4.5 shifted((k
      *12)*cm,12*cm);</p>
    <p style=" margin-top:0px; margin-bottom:0px; margin-left:0px;
      margin-right:0px; -qt-block-indent:0; text-indent:0px;
      line-height:100%;">         draw lmt_shade [</p>
    <p style=" margin-top:0px; margin-bottom:0px; margin-left:0px;
      margin-right:0px; -qt-block-indent:0; text-indent:0px;
      line-height:100%;">             path = r scaled 4.5,</p>
    <p style=" margin-top:0px; margin-bottom:0px; margin-left:0px;
      margin-right:0px; -qt-block-indent:0; text-indent:0px;
      line-height:100%;">             direction = "up",</p>
    <p style=" margin-top:0px; margin-bottom:0px; margin-left:0px;
      margin-right:0px; -qt-block-indent:0; text-indent:0px;
      line-height:100%;">             alternative = "circular",</p>
    <p style=" margin-top:0px; margin-bottom:0px; margin-left:0px;
      margin-right:0px; -qt-block-indent:0; text-indent:0px;
      line-height:100%;">             radius = k*cm,</p>
    <p style=" margin-top:0px; margin-bottom:0px; margin-left:0px;
      margin-right:0px; -qt-block-indent:0; text-indent:0px;
      line-height:100%;">             colors = { "MyColor1", "MyColor2"
      },</p>
    <p style=" margin-top:0px; margin-bottom:0px; margin-left:0px;
      margin-right:0px; -qt-block-indent:0; text-indent:0px;
      line-height:100%;">             ] shifted((k *12)*cm,1cm); </p>
    <p style=" margin-top:0px; margin-bottom:0px; margin-left:0px;
      margin-right:0px; -qt-block-indent:0; text-indent:0px;
      line-height:100%;">endfor;</p>
    <p style=" margin-top:0px; margin-bottom:0px; margin-left:0px;
      margin-right:0px; -qt-block-indent:0; text-indent:0px;
      line-height:100%;">StopPage;</p>
    <p style=" margin-top:0px; margin-bottom:0px; margin-left:0px;
      margin-right:0px; -qt-block-indent:0; text-indent:0px;
      line-height:100%;">\stopMPpage</p>
    <p style=" margin-top:0px; margin-bottom:0px; margin-left:0px;
      margin-right:0px; -qt-block-indent:0; text-indent:0px;
      line-height:100%;">}</p>
    <p style=" margin-top:0px; margin-bottom:0px; margin-left:0px;
      margin-right:0px; -qt-block-indent:0; text-indent:0px;
      line-height:100%;">\stoptext</p>
  </body>
</html>

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