Graftals in GF. examples/graftals

examples/graftals/Dragon.gf

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+concrete Dragon of Graftal = {
+lincat N = {x : Str; y : Str} ;
+lincat S = {s : Str} ;
+
+lin z = {x = ""; y = ""} ;
+lin s x = {x = x.x ++ R ++ x.y ++ F ++ R; y = L ++ F ++ x.x ++ L ++ x.y} ;
+lin c x = {s = "newpath 300 550 moveto" ++ F ++ x.x ++ "stroke showpage"} ;
+
+oper F : Str = "0 5 rlineto" ;
+oper L : Str = "+90 rotate" ;
+oper R : Str = "-90 rotate" ;
+
+}