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Triskele-Symbol-spiral.svg‎ (SVG file, nominally 639 × 600 pixels, file size: 13 KB)

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[edit] Summary

A spiral Triskelion symbol, constructed from mathematical Archimedean spirals. For a less elaborate version, see Image:Triskele-Symbol-spiral-five-thirds-turns.svg . For a more elaborate spiral triskelion symbol (with three turns instead of two), see Image:Triple-Spiral-Symbol-filled.svg, and for the most elaborate version, see Image:Triple-Spiral-Symbol-4turns-filled.svg. For a basic triple-spiral, see Image:Triple-Spiral-Symbol.svg, and for "wheeled" forms of the spiral triskelion/triple spiral symbol, see Image:Wheeled-Triskelion-basic.svg , Image:Roissy triskelion iron ring signet.png , Image:Triple-spiral-wheeled-simple.svg , or Image:Triskelion-spiral-threespoked-inspiral.svg . For a spiral triskelion with a hollow triangle in the center, see Image:Triskele-hollow-triangle.svg . For versions of a triple-spiral labyrinth, see Image:Triple-Spiral-labyrinth.svg and Image:Triple-Spiral-labyrinth-variant.svg .

SVG version of Image:Triskele-Symbol-spiral.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 /sweeps 2 def    % number of 360 degree turnings to show /double 1 def    % change to 0 to display single spiral %%%  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 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: /sweeps 1.67 def %%% double 0 ne{/phase 180 def aspiral}if grestore %%%%%%%%%%%%%%%% }def gsave 712 -134 translate -.75 .75 scale -3 rotate /centerx 304 def/centery 550 def/rotf 0 def archimdouble /centerx 707.333 def/centery 550 def/rotf 120 def archimdouble /centerx 505.667 def/centery 899.2967 def/rotf 240 def archimdouble grestore showpage %EOF

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File history

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	Date/Time	Thumbnail	Dimensions	User	Comment
current	12:28, 18 December 2006		639×600 (13 KB)	AnonMoos	(adding white background)
	06:53, 7 July 2006		639×600 (13 KB)	AnonMoos	(== Summary == A spiral Triskelion symbol, constructed from mathematical Archimedean spirals. For a less elaborate version, see Image:Triskele-Symbol-spiral-five-thirds-turns.svg . For a more elaborate spiral triskelion)

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