|
|
!'射影変換
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
!'射影変換
!' X'=L*X/(L-Y*SIN(T))
!' Y'=L*Y*COS(T)/(L-Y*SIN(T))
!'逆変換
!' X=L*COS(T)*X'/(SIN(T)*Y'+L*COS(T))
!' Y=L*Y'/(SIN(T)*Y'+L*COS(T))
!'INPUT PROMPT "L=":L
LET L=XSIZE
INPUT PROMPT "度(-90～90)=":T
CLEAR
FOR YS=0 TO YSIZE-1
LET Y=YS-YSIZE/2
FOR XS=0 TO XSIZE-1
LET X=XS-XSIZE/2
LET XX=L*COS(RAD(T))*X/(SIN(RAD(T))*Y+L*COS(RAD(T)))
LET YY=L*Y/(SIN(RAD(T))*Y+L*COS(RAD(T)))
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
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
|
|