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!' 正方形変換
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
!'正方形変換
!' X'=A*(X/A)^2
!' Y'=A*(Y/A)^2
!'逆変換
!' X=SQR(A)*SQR(X')
!' Y=SQR(A)*SQR(Y')
CLEAR
LET MODE=0
SELECT CASE MODE
CASE 0
FOR YS=0 TO YSIZE-1
LET Y=YS-YSIZE/2
FOR XS=0 TO XSIZE-1
LET X=XS-XSIZE/2
LET XX=SQR(XSIZE/2)*SQR(ABS(X))*SGN(X)
LET YY=SQR(YSIZE/2)*SQR(ABS(Y))*SGN(Y)
IF XX>=-XSIZE/2 AND XX<=XSIZE/2-1 AND YY>=-YSIZE/2 AND YY<=YSIZE/2-1 THEN
LET C=M(INT(XX+XSIZE/2),INT(YY+YSIZE/2))
CALL RGB(C,R,G,B)
CALL PSET(X+XSIZE/2,Y+YSIZE/2,R,G,B)
END IF
NEXT XS
NEXT YS
CASE 1
FOR YS=0 TO YSIZE-1
LET Y=YS-YSIZE/2
FOR XS=0 TO XSIZE-1
LET X=XS-XSIZE/2
LET XX=X
LET YY=SQR(YSIZE/2)*SQR(ABS(Y))*SGN(Y)
IF XX>=-XSIZE/2 AND XX<=XSIZE/2-1 AND YY>=-YSIZE/2 AND YY<=YSIZE/2-1 THEN
LET C=M(INT(XX+XSIZE/2),INT(YY+YSIZE/2))
CALL RGB(C,R,G,B)
CALL PSET(X+XSIZE/2,Y+YSIZE/2,R,G,B)
END IF
NEXT XS
NEXT YS
CASE 2
FOR YS=0 TO YSIZE-1
LET Y=YS-YSIZE/2
FOR XS=0 TO XSIZE-1
LET X=XS-XSIZE/2
LET XX=SQR(XSIZE/2)*SQR(ABS(X))*SGN(X)
LET YY=Y
IF XX>=-XSIZE/2 AND XX<=XSIZE/2-1 AND YY>=-YSIZE/2 AND YY<=YSIZE/2-1 THEN
LET C=M(INT(XX+XSIZE/2),INT(YY+YSIZE/2))
CALL RGB(C,R,G,B)
CALL PSET(X+XSIZE/2,Y+YSIZE/2,R,G,B)
END IF
NEXT XS
NEXT YS
END SELECT
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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