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!' 波形変換
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
INPUT PROMPT "A (1 - 10)=":A
INPUT PROMPT "B (1 - 5)=":B
!' 波形変換
!' X'=X+A*SIN(B*Y)
!' Y'=Y+A*SIN(B*X)
!' 波形変換
!' X'=X+A*SIN(B*Y)
!' Y'=Y
!' 逆変換
!' X=X'-A*SIN(B*Y')
!' Y=Y'
LET MODE=0
CLEAR
SELECT CASE MODE
CASE 0
FOR Y=0 TO YSIZE-1
LET XX=MAX(XX,XSIZE-1+INT(A*SIN(B*Y*PI/180)))
NEXT Y
FOR X=0 TO XSIZE-1
LET YY=MAX(YY,YSIZE-1+INT(A*SIN(B*X*PI/180)))
NEXT X
CALL GINIT(INT(XX),INT(YY))
FOR Y=0 TO YSIZE-1 STEP .5
FOR X=0 TO XSIZE-1 STEP .5
LET XA=X+A*SIN(B*Y*PI/180)
LET YA=Y+A*SIN(B*X*PI/180)
LET C=M(X,Y)
CALL RGB(C,RR,GG,BB)
CALL PSET(XA,YA,RR,GG,BB)
NEXT X
NEXT Y
CASE 1
FOR Y=0 TO YSIZE-1
FOR X=0 TO XSIZE-1
LET XA=X
LET YA=Y-A*SIN(B*X*PI/180)
IF XA>=0 AND XA<=XSIZE-1 AND YA>=0 AND YA<=YSIZE-1 THEN
LET C=M(XA,INT(YA))
CALL RGB(C,RR,GG,BB)
CALL PSET(X,Y,RR,GG,BB)
END IF
NEXT X
NEXT Y
CASE 2
FOR Y=0 TO YSIZE-1
FOR X=0 TO XSIZE-1
LET XA=X-A*SIN(B*Y*PI/180)
LET YA=Y
IF XA>=0 AND XA<=XSIZE-1 AND YA>=0 AND YA<=YSIZE-1 THEN
LET C=M(INT(XA),YA)
CALL RGB(C,RR,GG,BB)
CALL PSET(X,Y,RR,GG,BB)
END IF
NEXT X
NEXT Y
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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