76 lines
1.3 KiB
PostScript
76 lines
1.3 KiB
PostScript
%%% Start of L-system definition
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/STARTK { FK plusK plusK FK plusK plusK FK} def
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/FK {
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dup 0 eq
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{ DK } % if the recursion order ends, draw forward
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{
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1 sub % recurse
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4 {dup} repeat % dup the number of parameters (order) needed.
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FK minusK FK plusK plusK FK minusK FK }
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ifelse
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pop % pop the dup'd order
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} bind def
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/angleK 60 def
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/minusK { % rotation to the right
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angleK neg rotate
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} bind def
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/plusK { % rotation to the left
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angleK rotate
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} bind def
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%%% End of L-System definition
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/DK { sizeK 3 orderK exp div 0 rlineto } bind def
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/thicknessK {1 orderK dup mul div} bind def
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%%% Scaling factors
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/orderK 3 def
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/sizeK 300 def
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%%% Draws a Koch's snowflake of radius 180 at 0 0
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/Koch180 {
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gsave
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newpath
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thicknessK setlinewidth
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200 300 60 cos mul add
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neg
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200 100 60 sin mul add
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neg
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translate
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200 200 moveto
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orderK orderK orderK STARTK
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stroke
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closepath
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grestore
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} def % receives nothing
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%%% Draws an arbitrary Koch's snowflake
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/Koch {
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/orderK exch store
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gsave
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3 1 roll
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translate
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180 div dup scale
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rand 360 mod rotate
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Koch180
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grestore
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} def % Receives x y size order
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%%% Sample, bounded by an arc
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400 400 100 3 Koch
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newpath
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400 400
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100 0 360 arc
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stroke
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closepath
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showpage |