File:Triskele-Symbol-spiral-five-thirds-turns.svg

Size of this PNG preview of this SVG file: 641 × 600 pixels. Other resolutions: 256 × 240 pixels | 513 × 480 pixels | 821 × 768 pixels | 1,094 × 1,024 pixels | 2,188 × 2,048 pixels.

Original file (SVG file, nominally 641 × 600 pixels, file size: 8 KB)

This is a file from the Wikimedia Commons. Information from its description page there is shown below.
Commons is a freely licensed media file repository. You can help.

Summary

Description	A spiral Triskelion symbol, constructed from mathematical Archimedean spirals. A less wound version of Image:Triskele-Symbol-spiral.svg , with one and two thirds turns in each spiral, instead of two. For a more elaborate spiral triskelion symbol (with three turns), 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.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 a partial tesselation of similar shapes, see Image:Triskele-quasi-tesselation.svg .
Date	2006
Source	SVG version of Image:Triskele-Symbol-spiral-five-thirds-turns.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 1.67 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 1.34 def %%% double 0 ne{/phase 180 def aspiral}if grestore %%%%%%%%%%%%%%%% }def gsave 792 -230 translate -.95 .95 scale -4 rotate /centerx 304 def/centery 550 def/rotf 120 def archimdouble /centerx 634 def/centery 550 def/rotf 240 def archimdouble /centerx 469 def/centery 835.7884 def/rotf 0 def archimdouble grestore showpage %EOF
Author	AnonMoos

Licensing

I, the copyright holder of this work, release this work into the public domain. This applies worldwide.
In some countries this may not be legally possible; if so:
I grant anyone the right to use this work for any purpose, without any conditions, unless such conditions are required by law.

File history

Click on a date/time to view the file as it appeared at that time.

	Date/Time	Dimensions	User	Comment
current	22:57, 31 July 2022	641 × 600 (8 KB)	Smasongarrison	slimmed down with svgomg // Editing SVG source code using c:User:Rillke/SVGedit.js
	23:22, 12 April 2011	641 × 600 (11 KB)	Rudloff	SVG without xmlns attribute is not displayed correctly in some browsers.
	13:42, 30 December 2010	641 × 600 (11 KB)	AnonMoos	Reverted to version as of 06:54, 7 July 2006 - that version was already transparent
	12:57, 30 December 2010	641 × 600 (12 KB)	Beao	Transparent.
	05:01, 18 December 2006	641 × 600 (11 KB)	AnonMoos	adding white background
	06:54, 7 July 2006	641 × 600 (11 KB)	AnonMoos	== Summary == A spiral Triskelion symbol, constructed from mathematical Archimedean spirals. A less wound version of Image:Triskele-Symbol-spiral.svg , with one and two thirds turns in each spiral, instead of two. For