* z0---z1---z2---z3---cycle strange effect
@ 2007-06-04 23:05 David Arnold
2007-06-14 8:59 ` Mojca Miklavec
0 siblings, 1 reply; 5+ messages in thread
From: David Arnold @ 2007-06-04 23:05 UTC (permalink / raw)
To: Context Mailing List List
All,
In working through the beginning chapters of the metafun manual, I am
getting a very unusual effect when I open the resulting pdf file in
Preview on Mac OS X. Here's a snapshot of what I see.
http://online.redwoods.edu/instruct/darnold/context/meta.gif
In acrobat, it looks fine.
http://online.redwoods.edu/instruct/darnold/context/meta.pdf
Any thoughts?
\setuppapersize[S6][S6]
\usetypescriptonce [map] [times,helvetica,palatino] [texnansi]
\usetypescriptonce [serif] [times] [name,texnansi]
\usetypescriptonce [sans] [helvetica] [name,texnansi]
\usetypescriptonce [palatino] [texnansi]
\setupbodyfont [palatino,10pt]
\startbuffer[mpenv]
\startMPenvironment
\usetypescriptonce[map][times,helvetica,palatino][texnansi]
\usetypescriptonce[serif][times][name,texnansi]
\usetypescriptonce[sans][helvetica][name,texnansi]
\usetypescriptonce[palatino][texnansi]
\setupbodyfont[palatino,10pt]
\definefont[RotFont][RegularBold]
\stopMPenvironment
\stopbuffer
\definefont[RotFont][RegularBold]
\getbuffer[mpenv]
\setupcolors[state=start]
\starttext
\startuseMPgraphic{axis}
tickstep := 1cm ; ticklength := 2mm ;
drawticks unitsquare xscaled 8cm yscaled 3cm ;
tickstep := tickstep/2 ; ticklength := ticklength/2 ;
drawticks unitsquare xscaled 8cm yscaled 3cm ;
\stopuseMPgraphic
\startuseMPgraphic{points}
z0 = (0.5cm,1.5cm) ; z1 = (2.5cm,2.5cm) ;
z2 = (6.5cm,0.5cm) ; z3 = (2.5cm,1.5cm) ;
\stopuseMPgraphic
\startuseMPgraphic{path}
str := "z0---z1---z2---z3---cycle" ;
\stopuseMPgraphic
\startbuffer
\startlinecorrection[blank]
\startMPcode
string str ; defaultfont := "\truefontname{Mono}" ;
\includeMPgraphic{axis}
\includeMPgraphic{points}
\includeMPgraphic{path}
label.lft(str,(14.5cm,2.5cm)) ;
drawwholepath scantokens(str) ;
\stopMPcode
\stoplinecorrection
\stopbuffer
\getbuffer
\stoptext
___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!
maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage : http://www.pragma-ade.nl / http://tex.aanhet.net
archive : https://foundry.supelec.fr/projects/contextrev/
wiki : http://contextgarden.net
___________________________________________________________________________________
^ permalink raw reply [flat|nested] 5+ messages in thread* Re: z0---z1---z2---z3---cycle strange effect 2007-06-04 23:05 z0---z1---z2---z3---cycle strange effect David Arnold @ 2007-06-14 8:59 ` Mojca Miklavec 2007-06-14 9:04 ` Mojca Miklavec 2007-06-14 9:24 ` Taco Hoekwater 0 siblings, 2 replies; 5+ messages in thread From: Mojca Miklavec @ 2007-06-14 8:59 UTC (permalink / raw) To: mailing list for ConTeXt users; +Cc: Taco Hoekwater On 6/5/07, David Arnold wrote: > All, > > In working through the beginning chapters of the metafun manual, I am > getting a very unusual effect when I open the resulting pdf file in > Preview on Mac OS X. Here's a snapshot of what I see. > > http://online.redwoods.edu/instruct/darnold/context/meta.gif > > In acrobat, it looks fine. > > http://online.redwoods.edu/instruct/darnold/context/meta.pdf > > Any thoughts? Hello, It all boils down to \starttext \startMPcode z0 = (0.5cm,1.5cm) ; z1 = (2.5cm,2.5cm) ; z2 = (6.5cm,0.5cm) ; z3 = (2.5cm,1.5cm) ; draw z0---z1---z2---z3---cycle withpen pencircle scaled 5pt; \stopMPcode \stoptext resulting in newpath 14.17323 42.51968 moveto 14.17139 42.52553 70.85913 70.86505 70.86613 70.86613 curveto 70.88313 70.86877 184.25645 14.18352 184.25194 14.17323 curveto 184.2461 14.15994 70.87599 42.51889 70.86613 42.51968 cureveto 70.86118 42.52008 14.17513 42.5137 14.17323 42.51968 curveto closepath If you ask me, this looks pretty much like a rendering bug in Mac's Preview (if anyone bothers about that, please do that), but on the other hand metapost could have generated a shorter & cleaner output as well: newpath 14.17323 42.51968 moveto 70.86613 70.86613 lineto 184.25194 14.17323 lineto 70.86613 42.51968 lineto 14.17323 42.51968 lineto closepath I suspect that the problem lies in control points of bezier curve which are way too close to original points and thus lead to problems with numerical precision, but I didn't experiment much deeper, so my assumption might be wrong. Taco? Mojca PS: I'm using mp 0.993 from TeXLive, but Supelec was down, so I wasn't able to try it with the latest metapost version. > \setuppapersize[S6][S6] > > \usetypescriptonce [map] [times,helvetica,palatino] [texnansi] > \usetypescriptonce [serif] [times] [name,texnansi] > \usetypescriptonce [sans] [helvetica] [name,texnansi] > \usetypescriptonce [palatino] [texnansi] > > \setupbodyfont [palatino,10pt] > > \startbuffer[mpenv] > \startMPenvironment > \usetypescriptonce[map][times,helvetica,palatino][texnansi] > \usetypescriptonce[serif][times][name,texnansi] > \usetypescriptonce[sans][helvetica][name,texnansi] > \usetypescriptonce[palatino][texnansi] > \setupbodyfont[palatino,10pt] > \definefont[RotFont][RegularBold] > \stopMPenvironment > \stopbuffer > > \definefont[RotFont][RegularBold] > > \getbuffer[mpenv] > > \setupcolors[state=start] > > \starttext > > \startuseMPgraphic{axis} > tickstep := 1cm ; ticklength := 2mm ; > drawticks unitsquare xscaled 8cm yscaled 3cm ; > tickstep := tickstep/2 ; ticklength := ticklength/2 ; > drawticks unitsquare xscaled 8cm yscaled 3cm ; > \stopuseMPgraphic > > \startuseMPgraphic{points} > z0 = (0.5cm,1.5cm) ; z1 = (2.5cm,2.5cm) ; > z2 = (6.5cm,0.5cm) ; z3 = (2.5cm,1.5cm) ; > \stopuseMPgraphic > > \startuseMPgraphic{path} > str := "z0---z1---z2---z3---cycle" ; > \stopuseMPgraphic > > \startbuffer > \startlinecorrection[blank] > \startMPcode > string str ; defaultfont := "\truefontname{Mono}" ; > \includeMPgraphic{axis} > \includeMPgraphic{points} > \includeMPgraphic{path} > label.lft(str,(14.5cm,2.5cm)) ; > drawwholepath scantokens(str) ; > \stopMPcode > \stoplinecorrection > \stopbuffer > > \getbuffer > > > \stoptext ___________________________________________________________________________________ If your question is of interest to others as well, please add an entry to the Wiki! maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context webpage : http://www.pragma-ade.nl / http://tex.aanhet.net archive : https://foundry.supelec.fr/projects/contextrev/ wiki : http://contextgarden.net ___________________________________________________________________________________ ^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: z0---z1---z2---z3---cycle strange effect 2007-06-14 8:59 ` Mojca Miklavec @ 2007-06-14 9:04 ` Mojca Miklavec 2007-06-14 11:03 ` Alan Bowen 2007-06-14 9:24 ` Taco Hoekwater 1 sibling, 1 reply; 5+ messages in thread From: Mojca Miklavec @ 2007-06-14 9:04 UTC (permalink / raw) To: mailing list for ConTeXt users On 6/14/07, Mojca Miklavec wrote: > If you ask me, this looks pretty much like a rendering bug in Mac's > Preview (if anyone bothers about that, please do that), Sorry for a weird sentence (I deleted part of it and forgot to fix the rest) - I meant "if anyone bothers about reporting the problem to Apple (and if it hasn't been reported or fixed yet), plese do that". Preview has many other problems as well (no support for gouraud shading etc.). Mojca ___________________________________________________________________________________ If your question is of interest to others as well, please add an entry to the Wiki! maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context webpage : http://www.pragma-ade.nl / http://tex.aanhet.net archive : https://foundry.supelec.fr/projects/contextrev/ wiki : http://contextgarden.net ___________________________________________________________________________________ ^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: z0---z1---z2---z3---cycle strange effect 2007-06-14 9:04 ` Mojca Miklavec @ 2007-06-14 11:03 ` Alan Bowen 0 siblings, 0 replies; 5+ messages in thread From: Alan Bowen @ 2007-06-14 11:03 UTC (permalink / raw) To: mailing list for ConTeXt users On Jun 14, 2007, at 5:04 AM, Mojca Miklavec wrote: > On 6/14/07, Mojca Miklavec wrote: > >> If you ask me, this looks pretty much like a rendering bug in Mac's >> Preview (if anyone bothers about that, please do that), > > Sorry for a weird sentence (I deleted part of it and forgot to fix the > rest) - I meant "if anyone bothers about reporting the problem to > Apple (and if it hasn't been reported or fixed yet), plese do that". > Preview has many other problems as well (no support for gouraud > shading etc.). > > Mojca > ______________________________________________________________________ > _____________ > If your question is of interest to others as well, please add an > entry to the Wiki! > > maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ > ntg-context > webpage : http://www.pragma-ade.nl / http://tex.aanhet.net > archive : https://foundry.supelec.fr/projects/contextrev/ > wiki : http://contextgarden.net > ______________________________________________________________________ > _____________ ___________________________________________________________________________________ If your question is of interest to others as well, please add an entry to the Wiki! maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context webpage : http://www.pragma-ade.nl / http://tex.aanhet.net archive : https://foundry.supelec.fr/projects/contextrev/ wiki : http://contextgarden.net ___________________________________________________________________________________ ^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: z0---z1---z2---z3---cycle strange effect 2007-06-14 8:59 ` Mojca Miklavec 2007-06-14 9:04 ` Mojca Miklavec @ 2007-06-14 9:24 ` Taco Hoekwater 1 sibling, 0 replies; 5+ messages in thread From: Taco Hoekwater @ 2007-06-14 9:24 UTC (permalink / raw) To: Mojca Miklavec; +Cc: mailing list for ConTeXt users Mojca Miklavec wrote: > draw z0---z1---z2---z3---cycle withpen pencircle scaled 5pt; > > resulting in > > newpath > 14.17323 42.51968 moveto > 14.17139 42.52553 70.85913 70.86505 70.86613 70.86613 curveto > 70.88313 70.86877 184.25645 14.18352 184.25194 14.17323 curveto > 184.2461 14.15994 70.87599 42.51889 70.86613 42.51968 cureveto > 70.86118 42.52008 14.17513 42.5137 14.17323 42.51968 curveto > closepath > > If you ask me, this looks pretty much like a rendering bug in Mac's > Preview (if anyone bothers about that, please do that), agree > but on the > other hand metapost could have generated a shorter & cleaner output as > well: > > newpath > 14.17323 42.51968 moveto > 70.86613 70.86613 lineto > 184.25194 14.17323 lineto > 70.86613 42.51968 lineto > 14.17323 42.51968 lineto > closepath It would have done that, if the input would have been: draw z0--z1--z2--z3--cycle withpen pencircle scaled 5pt; Small differences like this should not be removed automatically, in my opinion, as they will be visible if the image is to be printed as a poster (A0 format). > I suspect that the problem lies in control points of bezier curve > which are way too close to original points and thus lead to problems > with numerical precision, but I didn't experiment much deeper, so my > assumption might be wrong. Almost certainly, but rounding errors are not an excuse for obviously incorrect rendering. Best wishes, Taco ___________________________________________________________________________________ If your question is of interest to others as well, please add an entry to the Wiki! maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context webpage : http://www.pragma-ade.nl / http://tex.aanhet.net archive : https://foundry.supelec.fr/projects/contextrev/ wiki : http://contextgarden.net ___________________________________________________________________________________ ^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2007-06-14 11:03 UTC | newest] Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2007-06-04 23:05 z0---z1---z2---z3---cycle strange effect David Arnold 2007-06-14 8:59 ` Mojca Miklavec 2007-06-14 9:04 ` Mojca Miklavec 2007-06-14 11:03 ` Alan Bowen 2007-06-14 9:24 ` Taco Hoekwater
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