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authorNorbert Preining <norbert@preining.info>2019-09-02 13:46:59 +0900
committerNorbert Preining <norbert@preining.info>2019-09-02 13:46:59 +0900
commite0c6872cf40896c7be36b11dcc744620f10adf1d (patch)
tree60335e10d2f4354b0674ec22d7b53f0f8abee672 /info/examples/lgc2/4-4-7.mp
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+% --- start of displayed preamble in the book ---
+
+% --- end of displayed preamble in the book ---
+% graphic converted to gray in book using 'color2gray'
+defaultfont:="ptmr8r";
+warningcheck:=0;
+beginfig(1)
+numeric psi,iter,c,r,t,cv;
+path p;
+psi=137.6;
+iter=200;
+c=5;
+r=0;
+for i=iter downto 1:
+ t:=sqrt(i);
+ r:=(r+psi) mod 360;
+ cv:=cosd((i/iter)*90);
+ p:=((0,0)--(t,1)--
+ (t+1,0)--(t,-1)--cycle)
+ rotated r;
+ fill p scaled c withcolor (1,cv,0);
+ draw p scaled c;
+endfor;
+endfig;
+end;