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!' 方程式 x^n+y^n=r^n を使用して円形変換します(n=2の時)
FILE GETNAME F$,"BMP,JPG,GIF,PNGファイル|*.BMP;*.JPG;*.GIF;*.PNG"
CALL PICTURELOAD(F$,XSIZE,YSIZE)
DIM M(0 TO XSIZE-1,0 TO YSIZE-1)
ASK PIXEL ARRAY (0,0) M
CLEAR
LET N=1.5 !' N=2で円形変換
IF XSIZE>YSIZE THEN
LET R=YSIZE/2
FOR YS=0 TO YSIZE-1
LET Y=YS-YSIZE/2
LET R1=(R^N-ABS(Y)^N)^(1/N)
FOR XS=0 TO XSIZE-1
LET XX=-R1+XS*R1/R*YSIZE/XSIZE
LET YY=Y
LET C=M(XS,YS)
CALL RGB(C,RR,GG,BB)
CALL PSET(XX+XSIZE/2,YY+YSIZE/2,RR,GG,BB)
NEXT XS
NEXT YS
ELSE
LET R=XSIZE/2
FOR XS=0 TO XSIZE-1
LET X=XS-XSIZE/2
LET R1=(R^N-ABS(X)^N)^(1/N)
FOR YS=0 TO YSIZE-1
LET YY=-R1+YS*R1/R*XSIZE/YSIZE
LET XX=X
LET C=M(XS,YS)
CALL RGB(C,RR,GG,BB)
CALL PSET(XX+XSIZE/2,YY+YSIZE/2,RR,GG,BB)
NEXT YS
NEXT XS
END IF
END
EXTERNAL SUB RGB(X,R,G,B)
LET B=MOD(INT(X/65536),256)
LET G=MOD(INT(X/256),256)
LET R=MOD(X,256)
END SUB
EXTERNAL SUB GINIT(XSIZE,YSIZE)
SET BITMAP SIZE XSIZE,YSIZE
SET COLOR MODE "NATIVE"
CLEAR
SET POINT STYLE 1
SET WINDOW 0,XSIZE-1,YSIZE-1,0
END SUB
EXTERNAL SUB PSET(X,Y,R,G,B)
SET COLOR COLORINDEX(R/255,G/255,B/255)
PLOT POINTS:X,Y
END SUB
EXTERNAL SUB PICTURELOAD(N$,XSIZE,YSIZE)
SET COLOR MODE "NATIVE"
CLEAR
SET POINT STYLE 1
IF N$="" THEN STOP
GLOAD N$
LET XSIZE=PIXELX(1)+1
LET YSIZE=PIXELY(1)+1
SET BITMAP SIZE XSIZE,YSIZE
SET WINDOW 0,XSIZE-1,YSIZE-1,0
END SUB
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