Delwedd:Triple-Spiral-Symbol-4turns-filled.png
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Triple-Spiral-Symbol-4turns-filled.png ((640 × 600 picsel, maint y ffeil: 15 KB, ffurf MIME: image/png))
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Crynodeb
DisgrifiadTriple-Spiral-Symbol-4turns-filled.png | Most elaborate version of Triple Spiral symbol constructed from mathematical Archimedean spirals (see Image:Triple-Spiral-Symbol.png). This version consists of filled spirals with four turns. See also Image:Triskele-Symbol-spiral.png (with two turns) and Image:Triple-Spiral-Symbol-filled.png (with three). Image:Triple-Spiral-4turns_green_transparent.png is another variant. For a basic triple-spiral, see Image:Triple-Spiral-Symbol.png , and for "wheeled" forms of the spiral triskelion/triple spiral symbol, see Image:Wheeled-Triskelion-basic.png , Image:Roissy triskelion iron ring signet.png , Image:Triple-spiral-wheeled-simple.png , or Image:Triskelion-spiral-threespoked-inspiral.png . For a spiral triskelion with a hollow triangle in the center, see Image:Triskele-hollow-triangle.png . For versions of a triple-spiral labyrinth, see Image:Triple-Spiral-labyrinth.png and Image:Triple-Spiral-labyrinth-variant.png . | |||||
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Ffynhonnell |
Generated by means of 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 = insert a curve point every these degrees /sweeps swp2 def % number of 360 degree turnings to show % double - 0 to display single spiral, else double %%% 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{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{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}def /phase 0 def aspiral %%% If different sweeps parameter for second spiral, define here: /sweeps 3.67 def %%% double 0 ne{/phase 180 def aspiral}if grestore %%%%%%%%%%%%%%%% }def gsave 573.5 100 translate -.36 dup neg scale -1 rotate /lower 0 def/double 1 def/swp2 4 def/incrm 15 def /centerx 304 def/centery 550 def/rotf 0 def archimdouble /centerx 1147.334 def/centery 550 def/rotf 120 def archimdouble /centerx 725.667 def/centery 1280.3486 def/rotf 240 def archimdouble /lower 1460.31 def/double 0 def/swp2 1480 360 div def/incrm 9.83 def /centerx 304 def/centery 550 def/rotf 0 def archimdouble /centerx 1147.334 def/centery 550 def/rotf 120 def archimdouble /centerx 725.667 def/centery 1280.3486 def/rotf 240 def archimdouble grestore showpage %EOF |
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Awdur | AnonMoos | |||||
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Yr wyf fi, deiliad hawlfraint y gwaith hwn, yn ei ryddhau i'r parth cyhoeddus, a hynny'n fyd-eang. Hwyrach nad yw hyn yn bosib yn ôl cyfraith rhai gwledydd; os felly: Rwyn rhoi i unrhywun yr hawl i ddefnyddio'r gwaith hwn at unrhyw ddiben, heb unrhyw amodau, oddieithr unrhyw amodau gofynnol yn ôl y gyfraith. |
Items portrayed in this file
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2005
Hanes y ffeil
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Dyddiad / Amser | Bawdlun | Hyd a lled | Defnyddiwr | Sylw | |
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cyfredol | 19:10, 23 Tachwedd 2005 | 640 × 600 (15 KB) | AnonMoos | Most elaborate version of Triple Spiral symbol constructed from mathematical Archimedean spirals (see Image:Triple-Spiral-Symbol.png). This version consists of filled spirals with four turns. See also Image:Triskele-Symbol-spiral.png (with two |
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