Am 21.07.2011 16:53, schrieb luigi scarso: > On Thu, Jul 21, 2011 at 4:39 PM, Alan Braslau <alan.bras...@cea.fr> wrote: >> Hello, >> >> I have a question for metapost specialists: >> >> I am looking for some sort of effect, built upon a zig-zag line. >> The first graphic in the minimal example below is as I would expect. >> The second graphic seems to be drawn without the point at (0,0). >> (Ignore the asymmetry at the end of the path in the 2nd, this >> is to be expected in this minimal example.) >> >> Is the result correct or is this a bug? >> >> Alan >> >> >> >> \starttext >> >> \startTEXpage >> \startMPcode >> u := 1mm ; >> >> path p[] ; >> p0 := ((0,0)--(1,0)) rotated 45 scaled 20u ; >> pickup pensquare scaled 10u rotated 45 ; >> draw p0 withcolor blue ; >> pickup pensquare yscaled 2u xscaled 5u rotated 45 ; >> draw p0 withcolor yellow ; >> pickup pencircle scaled .1u ; >> draw p0 ; >> \stopMPcode >> \stopTEXpage >> >> \startTEXpage >> \startMPcode >> p1 := ((0,0)--(sqrt(2),0)) rotated -30 scaled 20u >> shifted point infinity of p0 ; >> p2 := p0--p1 ; >> use
p2 := p0 & p1; the reason for the 'unexpected' output is, that point 1 and 2 of the path p2 are equal. keep in mind that drawing with an asymmetrical pen has its own (complex) rules. >> pickup pensquare scaled 10u rotated 45 ; >> draw p2 withcolor blue ; >> pickup pensquare yscaled 2u xscaled 5u rotated 45 ; >> draw p2 withcolor yellow ; >> pickup pencircle scaled .1u ; >> draw p2 ; >> \stopMPcode >> \stopTEXpage >> >> \stoptext > You are shifting by a certain amount : what is the net effect of > shifted point infinity of p0 ? > afaik simply the last point of p0. ___________________________________________________________________________________ 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 : http://foundry.supelec.fr/projects/contextrev/ wiki : http://contextgarden.net ___________________________________________________________________________________
