File:Triskelion-spiral-threespoked-inspiral.svg
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DescrizioneTriskelion-spiral-threespoked-inspiral.svg |
A form of a Triskelion symbol containing three double spirals which branch out into a larger spiral which encloses the whole figure. Inspired by various Celtic decorative motifs, but this version is constructed from mathematical Archimedean spirals. Useful as an example of a "wheeled" type of triskelion. For less ornate "wheeled" triskelions with partially-enclosing circle (instead of enclosing spiral), see Image:Wheeled-Triskelion-basic.svg , Image:Roissy triskelion iron ring signet.png , and Image:Triple-spiral-wheeled-simple.svg . ![]() |
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Fonte |
SVG version of Image:Triskelion-spiral-threespoked-inspiral.png . Converted from the following PostScript code: %! /archimdouble{ %%%%%%%%%%%%%%%% % 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: % centerx = horizontal coordinate of center of spiral % centery = vertical coordinate of center of spiral % rotf = degrees to rotate /sepwid 110 def % width separating successive turnings of spiral % (half this if double spiral is selected) /incrm 15 def % insert a curve point after this number of degrees % CHANGE TO 30 EXCEPT AT TRANSITIONS /double 1 def % change to 0 to display single spiral /quadruple 1 def % change to 0 to display single/double spiral only %%% Procedures: /pi 3.1415926535898 def/radians 57.295779513082 def /sepwid sepwid pi div 2 div def gsave centerx centery translate rotf rotate /aspiral{/prevbezy 0 def/first 1 def lower incrm sweeps 360 mul{8{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 0 eq phase 90 eq phase 270 eq or and{/slope 999999999 def}{/slope sinth thcosth add costh thsinth sub div def}ifelse sinth 0 gt sinth 0 eq costh -1 eq and or{/flag -1 def}{/flag 1 def}ifelse /A exch def phase 0 eq phase 180 eq or{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}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{0 0 moveto/prevbezx phase cos nextdist mul def/first 0 def }{first 1 eq{x y moveto/first 0 def}{prevbezx prevbezy x 1 flag mul normaliz div prevdist mul sub y slope flag mul normaliz div prevdist mul sub x y curveto}ifelse /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 x y moveto x 1 flag mul normaliz div nextdist mul pi mul const mul add y slope flag mul normaliz div nextdist mul pi mul const mul add lineto stroke}def /sweeps 1.67 def % number of 360 degree turnings to show /const 2.315 def /phase 0 def aspiral double 0 ne{ /sweeps 1.4584 def /const 2.621 def /phase 90 def aspiral}if quadruple 0 ne{ /sweeps 645.1 360 div def /const 0 def /phase 180 def aspiral /sweeps 555.1 360 div def /const 0 def /phase 270 def aspiral}if grestore %%%%%%%%%%%%%%%% }def 68 55 translate .75 dup scale gsave 800 0 translate -.75 .75 scale -20.77 rotate /lower 0 def /disp{70 rotf -56.801 sub}def/trnslx{disp sin neg mul disp cos mul translate}def gsave /centerx 304 def/centery 550 def/rotf 125.67 def trnslx archimdouble grestore gsave /centerx 634 def/centery 550 def/rotf 245.67 def trnslx archimdouble grestore gsave /centerx 469 def/centery 835.7884 def/rotf 5.67 def trnslx archimdouble grestore grestore .75 setlinewidth 598.996 0 translate -1 1 scale 299.498 327.764 10.3125 360 0 arcn stroke 299.498 327.764 translate /sepwid 123.75 pi div 2 div def /const 0 def /incrm 30 def gsave -3.0445 rotate 1.00451 dup scale /sweeps 3.1 def /lower 870 def /phase 60 def aspiral /phase 180 def aspiral /phase 300 def aspiral grestore gsave -2.87 rotate 1.00412 dup scale /sweeps 3.27 def /lower 930 def /phase 0 def aspiral /phase 120 def aspiral /phase 240 def aspiral grestore showpage %EOF |
Autore | AnonMoos |
Licenza
Public domainPublic domainfalsefalse |
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Data/Ora | Miniatura | Dimensioni | Utente | Commento | |
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attuale | 18:34, 27 lug 2011 | ![]() | 606 × 617 (8 KB) | AnonMoos | not transparent in corners |
14:28, 18 dic 2006 | ![]() | 606 × 617 (8 KB) | AnonMoos | adding white background | |
08:51, 7 lug 2006 | ![]() | 606 × 617 (8 KB) | AnonMoos | == Summary == right|120px A form of a Triskelion symbol containing three double spirals which branch out into a larger spiral which encloses the whole figure. Inspired by various Celtic decorative motifs, but this v |
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Titolo breve | Ornate double-spiral triskelion with spokes, within an overall spiral |
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