Re: [NTG-context] Missing graphic in MPpage when viewing in Apple MAC Preview or GIMP 2.10 but not Adobe

15 Aug 2020

      Hi Keith,

It took me a while before I saw it, but I think you wanted to type in

  z0 = (60,60);
  z1 = z0 rotated 120;
  z2 = z0 rotated 240;

instead of 

  z0 = (60,60);
  z1 = z0 rotated 120;
  z2 = z1 rotated 240;

because the latter puts z2 at z0, resulting in a path that is a straight line. The fact that AR displays anything at all is probably some form of correction like "fill of empty path == single pixel line”.

Best wishes,
Taco
...
On 15 Aug 2020, at 17:39, Keith McKay  wrote:
Dear List
I have come across a problem which I don't think is due to ConTeXt but I'm hopping the great and the good of this list may be able to explain what is going on.
The code below produces an MPpage with a shaded background and two graphics along with a line of outlined text. When I view in Adobe (or the output from TeXworks) I see everything as it should be. However, I wanted to convert the MPpage to a jpeg file and when I opened the pdf in either Apple MAC Preview or Gimp 2.10 the two graphics are missing, and I have no idea why.
Could someone explain a way round this?  Here is the code.
Thanks
Keith
%%%%%%%%%%%%%%%%%%%%%%%%%%
system          >
system          > ConTeXt  ver: 2020.07.29 18:36 LMTX  fmt: 2020.7.29  int: english/english
system          >
%%%%%%%%%%%%%%%%%%%%%%%%%%%
\setuppapersize [A5, portrait]
\usecolors[crayola]
\starttext
\startMPpage
StartPage;
width := PaperWidth ; height := PaperHeight ; unit := cm ;
definecolor [ name = "MyColor1", r = 0.781, g = 0.5, b = 0.5 ] ;
definecolor [ name = "MyColor3", r = 1, g = 1, b = 0.7983 ] ;
draw lmt_shade [
path = unitsquare xscaled 14.8cm yscaled 21cm,
direction = "up",
alternative = "linear",
colors = { "MyColor1", "MyColor3" },
] ;
z0 = (60,60);
  z1 = z0 rotated 120;
  z2 = z1 rotated 240;
  path carre;
  carre = z0--z1--z2--cycle;
  picture pic;
  pic := image(
 numeric d; d := 0.0005;
 for i=1 step -d until d:
  fill carre scaled i shifted (3.9cm,17cm) withcolor((1 + i)*(\MPcolor{VividTangerine})) ;
    	fill carre rotated (45) scaled i shifted (3.9cm,17cm)  withcolor((1 + i)*(\MPcolor{VividTangerine})) ;
       fill carre rotated (90) scaled i shifted (3.9cm,17cm)  withcolor((1 + i)*(\MPcolor{VividTangerine})) ;
    	fill carre rotated (135) scaled i shifted (3.9cm,17cm)  withcolor((1 + i)*(\MPcolor{VividTangerine})) ;
    	fill carre rotated (180) scaled i shifted (3.9cm,17cm)  withcolor((1 + i)*(\MPcolor{VividTangerine})) ;
    	fill carre rotated (225) scaled i shifted (3.9cm,17cm)  withcolor((1 + i)*(\MPcolor{VividTangerine})) ;
endfor;);
draw pic rotatedaround(center pic, 270);
draw pic rotatedaround(center pic, 90) shifted (7cm,-13cm) ;
draw lmt_outline [
text = "Page 18"
kind = "draw",
drawcolor = "VividTangerine",
] xsized TextWidth shifted (1cm,7.67cm);
StopPage;
\stopMPpage
\stoptext
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Taco Hoekwater
Elvenkind BV