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C*GRSYXD -- obtain the polyline representation of a given symbol
C+
SUBROUTINE GRSYXD (SYMBOL, XYGRID, UNUSED)
INTEGER SYMBOL
INTEGER XYGRID(300)
LOGICAL UNUSED
C
C Return the digitization coordinates of a character. Each character is
C defined on a grid with X and Y coordinates in the range (-49,49),
C with the origin (0,0) at the center of the character. The coordinate
C system is right-handed, with X positive to the right, and Y positive
C upward.
C
C Arguments:
C SYMBOL (input) : symbol number in range (1..3000).
C XYGRID (output) : height range, width range, and pairs of (x,y)
C coordinates returned. Height range = (XYGRID(1),
C XYGRID(3)). Width range = (XYGRID(4),XYGRID(5)).
C (X,Y) = (XYGRID(K),XYGRID(K+1)) (K=6,8,...).
C UNUSED (output) : receives .TRUE. if SYMBOL is an unused symbol
C number. A character of normal height and zero width
C is returned. Receives .FALSE. if SYMBOL is a
C valid symbol number.
C
C The height range consists of 3 values: (minimum Y, baseline Y,
C maximum Y). The first is reached by descenders on lower-case g, p,
C q, and y. The second is the bottom of upper-case letters. The third
C is the top of upper-case letters. A coordinate pair (-64,0) requests
C a pen raise, and a pair (-64,-64) terminates the coordinate list. It
C is assumed that movement to the first coordinate position will be
C done with the pen raised - no raise command is explicitly included to
C do this.
C--
C 7-Mar-1983.
C 15-Dec-1988 - standardize.
C Hacked version -- uses CHARACTER*2 since G77 does not support INTEGER*2
C B. Toby 11/18/95
C-----------------------------------------------------------------------
C INTEGER*2 BUFFER(27000)
CHARACTER*2 BUFFER(27000)
INTEGER INDEX(3000), IX, IY, K, L, LOCBUF
INTEGER NC1, NC2
COMMON /GRSYMB/ NC1, NC2, INDEX, BUFFER
character*2 tmpch(2)
integer tmpint
equivalence (tmpint,tmpch)
C
C Extract digitization.
C
IF (SYMBOL.LT.NC1 .OR. SYMBOL.GT.NC2) GOTO 3000
L = SYMBOL - NC1 + 1
LOCBUF = INDEX(L)
IF (LOCBUF .EQ. 0) GOTO 3000
C XYGRID(1) = BUFFER(LOCBUF)
tmpint = 0
tmpch(1) = BUFFER(LOCBUF)
XYGRID(1) = tmpint
LOCBUF = LOCBUF + 1
K = 2
IY = -1
C -- DO WHILE (IY.NE.-64)
100 IF (IY.NE.-64) THEN
C IX = BUFFER(LOCBUF)/128
C IY = BUFFER(LOCBUF) - 128*IX - 64
tmpint = 0
tmpch(1) = BUFFER(LOCBUF)
IX = tmpint/128
IY = tmpint - 128*IX - 64
XYGRID(K) = IX - 64
XYGRID(K+1) = IY
K = K + 2
LOCBUF = LOCBUF + 1
GOTO 100
END IF
C -- end DO WHILE
UNUSED = .FALSE.
RETURN
C
C Unimplemented character.
C
3000 XYGRID(1) = -16
XYGRID(2) = -9
XYGRID(3) = +12
XYGRID(4) = 0
XYGRID(5) = 0
XYGRID(6) = -64
XYGRID(7) = -64
UNUSED = .TRUE.
RETURN
END
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