NetaTaneMenu >>>> 羊歯
*羊歯
----
左図は，これです。右図は正式なもの。

ソースがこれです。

!--------羊歯の行列の各成分---------
DATA 0.836,0.044,-0.044,0.836,0,0.619
READ a1,b1,c1,d1,e1,f1
DATA -0.144,0.302,0.302,0.141,0,0.127
READ a2,b2,c2,d2,e2,f2
DATA 0.141,-0.302,0.302,0.141,0,0.619
READ a3,b3,c3,d3,e3,f3
DATA 0,0,0,0.175,0,0
READ a4,b4,c4,d4,e4,f4
!----------------基点と範囲--------------
SET POINT STYLE 4
LET  px = 1
LET  py = 1
SET WINDOW -1,1.1,-1,4
PLOT POINTS: px,py
!----------------------------------
FOR i=0 TO 100000
   LET  k = RND
   IF k=<0.7 THEN
      LET px = a1*px+b1*py+e1
      LET py = c1*px+d1*py+f1
   ELSEIF k=<0.8 THEN
      LET px = a2*px+b2*py+e2
LET py = c2*px+d2*py+f2
   ELSEIF k=<0.9 THEN
      LET px = a3*px+b3*py+e3
      LET py = c3*px+d3*py+f3
   ELSE
      LET px = a4*px+b4*py+e4
      LET py = c4*px+d4*py+f4
   END IF
   SET POINT STYLE 1
   SET POINT COLOR 3
   PLOT POINTS: px, py
NEXT i
END
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