File:Triskele-Symbol-spiral.svg
From Wikimedia Commons, the free media repository
Triskele-Symbol-spiral.svg (SVG file, nominally 639 × 600 pixels, file size: 13 KB)
[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
[edit] Licensing
File history
Click on a date/time to view the file as it appeared at that time.
| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 12:28, 18 December 2006 | | 639×600 (13 KB) | AnonMoos (talk | contribs) | (adding white background) |
| 06:53, 7 July 2006 |  | 639×600 (13 KB) | AnonMoos (talk | contribs) | (== 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) |
- Edit this file using an external application (See the setup instructions for more information)
File links
The following 3 pages link to this file:
Global file usage
The following other wikis use this file:
- Usage of Triskele-Symbol-spiral.svg on angwiki
- Usage of Triskele-Symbol-spiral.svg on astwiki
- Usage of Triskele-Symbol-spiral.svg on brwiki
- Usage of Triskele-Symbol-spiral.svg on enwiki
View more global usage of this file.
