File:Archimedean spiral.png

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Archimedean_spiral.png(656 × 600 pixel, dimensione del file: 10 KB, tipo MIME: image/png)

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Descrizione Three 360° turnings of one arm of an Archimedean spiral.
Data
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Produced with the following PostScript code:

%!
.75 setgray
2 setlinewidth
280 640 moveto 0 -540 rlineto stroke
16 396 moveto 580 0 rlineto stroke
1 0 0 setrgbcolor
%%%%%%%%%%%%%%%%
% PostScript program to display an Archimedean spiral by approximating
% it with Bezier curves.  Can display a double spiral (two spirals
% rotated by 180 degrees with respect to each other).
%%%  Parameters:
/sepwid 100 def  % width separating successive turnings of spiral
                 % (half this if double spiral is selected)
/incrm 11.25 def % insert a curve point after this number of degrees
/sweeps 3 def    % number of 360 degree turnings to show
/centerx 280 def % horizontal coordinate of center of spiral
/centery 396 def % vertical coordinate of center of spiral
/double 0 def    % change to 1 to display double spiral
/linew 3 def     % increase number for thicker line
%%%  Procedures:
/pi 3.1415926535898 def/radians 57.295779513082 def
/sepwid sepwid pi div 2 div def
gsave centerx centery translate linew setlinewidth
/aspiral{/prevbezy 0 def 0 0 moveto
    0 incrm sweeps 360 mul{7{dup}repeat
        phase add cos/costh exch def
        phase add sin/sinth exch def
        costh mul radians div/thcosth exch def
        sinth mul radians div/thsinth exch def
        thcosth sepwid mul/x exch def
        thsinth sepwid mul/y exch def
        /slope sinth thcosth add costh thsinth sub div def
        sinth 0 gt sinth 0 eq costh -1 eq and or{/flag -1 def}{/flag 1
            def}ifelse
        /A exch def A 49.29348 lt A 180 gt A 196.273450852 lt and A 360
            gt A 368.8301 lt and A 540 gt A 545.9907 lt and A 720 gt A
            724.5217 lt and A 900 gt A 903.6281968 lt and or or or or
            or{/flag flag neg def}if
        incrm sub 3{dup}repeat phase add cos sepwid mul mul radians div
            /prevx exch def phase add sin sepwid mul mul radians div
            /prevy exch def
        incrm add 3{dup}repeat phase add cos sepwid mul mul radians div
            /nextx exch def phase add sin sepwid mul mul radians div
            /nexty exch def
        /prevdist x prevx sub dup mul y prevy sub dup mul add sqrt pi
            div def
        /nextdist x nextx sub dup mul y nexty sub dup mul add sqrt pi
            div def
        /normaliz slope slope mul 1 add sqrt def
        0 eq{/prevbezx phase cos nextdist mul def}{prevbezx prevbezy
        x 1 flag mul normaliz div prevdist mul sub y slope flag mul
            normaliz div prevdist mul sub
        x y curveto
        /prevbezx x 1 flag mul normaliz div nextdist mul add def
        /prevbezy y slope flag mul normaliz div nextdist mul add def}ifelse}
    for stroke}def
/phase 0 def aspiral
%%% If different sweeps parameter for second spiral, define here:
%%%%%%%%%%%%%%%%
double 0 ne{/phase 180 def aspiral}if grestore
showpage
%EOF
Autore User:AnonMoos
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File:Archimedean spiral.svg è una versione vettoriale di questo file. Dovrebbe essere usata quella versione al posto di questo file PNG, quando sia migliore.

File:Archimedean spiral.png → File:Archimedean spiral.svg

Per maggiori informazioni, vedi Help:SVG.

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Licenza

Public domain Quest'opera è stata rilasciata nel pubblico dominio dal suo autore, AnonMoos. Questa norma si applica in tutto il mondo.

In alcuni paesi questo potrebbe non essere legalmente possibile. In tal caso:
AnonMoos garantisce a chiunque il diritto di utilizzare quest'opera per qualsiasi scopo, senza alcuna condizione, a meno che tali condizioni siano richieste dalla legge.

Edit history on en.wikipedia

date/time username edit summary
22:42, 20 November 2005 en:User:AnonMoos (update description to reflect new version of image)
23:05, 16 November 2005 en:User:AnonMoos (add category)
12:59, 23 October 2005 en:User:AnonMoos (tweaking)
02:16, 23 October 2005 en:User:AnonMoos →Summary
01:40, 23 October 2005 en:User:AnonMoos
01:38, 23 October 2005 en:User:AnonMoos (tags)
01:20, 23 October 2005 en:User:AnonMoos (One arm of an Archimedean spiral (higher-resolution picture). Produced with the following PostScript code: .75 setgray 2 setlinewidth 280 640 moveto 0 -540 rlineto stroke 16 396 moveto 580 0 rlineto stroke 1 0 0 setrgbcolor 1 setlinecap %%%%%)

Upload history on en.wikipedia

  • (del) (cur) 22:38, 20 November 2005 . . en:User:AnonMoos AnonMoos ( en:User_talk:AnonMoos Talk) . . 656x600 (9955 bytes) (larger slightly-corrected version)
  • (del) (rev) 01:20, 23 October 2005 . . en:User:AnonMoos AnonMoos ( en:User_talk:AnonMoos Talk) . . 600x550 (9150 bytes) (One arm of an Archimedean spiral (higher-resolution picture). Produced with the following PostScript code: <nowiki> %! .75 setgray 2 setlinewidth 280 640 moveto 0 -540 rlineto stroke 16 396 moveto 580 0 rlineto stroke 1 0 0 setrgbcolor 1 setlinecap %%%%%)

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Data/OraMiniaturaDimensioniUtenteCommento
attuale19:12, 18 mar 2006Miniatura della versione delle 19:12, 18 mar 2006656 × 600 (10 KB)wikimediacommons>MaksimLa bildo estas kopiita de wikipedia:en. La originala priskribo estas: == Summary == Three 360° turnings of one arm of an Archimedean spiral (higher-resolution picture). Produced with the following PostScript code: <pre><nowiki>%! .75 setgray 2 setline

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