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

[Taco Hoekwater]

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 <mckaymeister at gmail.com> 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