Image: Triple-Spiral-Symbol

Description: The Triple Spiral symbol, based on motifs found at the prehistoric site at Newgrange, Ireland, and used as a neo-pagan or Triple Goddess symbol. This version is made up of mathematical Archimedean spirals. For a version with thicker lines, see Image:Triple-Spiral-Symbol-heavystroked.svg . For spiral triskelions, see also Image:Triple-Spiral-Symbol-filled.svg , Image:Triple-Spiral-Symbol-4turns-filled.svg , and Image:Triskele-Symbol-spiral.svg . For "wheeled" forms of the spiral triskelion/triple spiral symbol, see Image:Wheeled-Triskelion-basic.svg , Image:Roissy triskelion iron ring signet.svg , 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 .
Title: Triple-Spiral-Symbol
Credit: SVG version of Image:Triple-Spiral-Symbol.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 3 def  % number of 360 degree turnings to show /double 1 def  % change to 0 to display single spiral /linew 13.75 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 rotf rotate 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: /sweeps 2.67 def %%% double 0 ne{/phase 180 def aspiral}if grestore %%%%%%%%%%%%%%%% }def gsave -9 0 translate .4875 dup scale %%% decrease to .47 to fit on A4-size page -2 rotate /centerx 304 def/centery 550 def/rotf 0 def archimdouble /centerx 927.334 def/centery 550 def/rotf 120 def archimdouble /centerx 615.667 def/centery 1089.823 def/rotf 240 def archimdouble grestore showpage %EOF
Author: AnonMoos
Usage Terms: Public domain
License: Public domain
Attribution Required?: No