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|
C* W9DRIV -- PGPLOT device driver for Windows95 (or WindowsNT)
C+
SUBROUTINE W9DRIV (IFUNC, RBUF, NBUF, CHR, LCHR, MODE)
USE MSFLIB
IMPLICIT NONE
INTEGER IFUNC, NBUF, LCHR, MODE
REAL RBUF(*)
CHARACTER CHR*(*)
C
C PGPLOT driver for IBM PC's and clones running Microsoft PowerStation
C Fortran (4.0 or higher). This driver will create a graphics window.
C PGEND will return control to the default (text) window, but the graphics
C window is not erased until <RETURN> is pressed.
C
C This routine must be compiled and linked with the Microsoft MSFLIB graphics
C library. Application must be compiled as a "QuickWin Graphics" project type,
C compiler command line option /MW.
C
C 1989-Nov-03 - (MSDRIV) Started work [AFT]
C 1989-Apr-06 - Improved version [AFT]
C 1991-Mar-13 - Added cursor routine [JHT]
C 12/1993 C. T. Dum: Version for MS Fortran Power Station
C 1996-Apr-26 - W9DRIV (Windows95/PowerStation 4.0 version):
C resolution modes; interrupt driven mouse (cursor band modes);
C rectangle fill; pixel lines [Phil Seeger, PASeeger@aol.com]
C 1996-Apr-30 - multiple devices; return color representation [PAS]
C 1996-May-03 - each window has its own resolution and palette [PAS]
C-----------------------------------------------------------------------
C
C Supported device: IBM PC's and compatibles with Windows95;
C requires VGA or higher graphics adapter
C
C Device type code: /W95 (also /WV, /WS, /WX, or /WZ)
C
C Modes: 1, VGA, 640 x 480
C 2, SVGA, 800 x 600
C 3, XGA, 1024 x 768
C 4, ZGA, 1280 x 1024
C 0, from PGPLOT_VIDEO environment parameter, or SVGA
C The Default mode is 800 x 640 pixels (SVGA). Other resolution
C modes are accessed by entering SET PGPLOT_VIDEO=VGA (640x480),
C XGA (1024x768), or ZGA (1280x1024) in the AUTOEXEC.BAT file, or
C by using alternate device type designations. The maximum allowed
C mode is determined by the graphics card and the Windows95 driver.
C
C Color capability: Color indices 0-15 are set to the default values
C of PGPLOT, and indices 16-235 default to a gray scale. Palettes
C of up to 235 colors are saved for each of 8 possible device
C windows. (20 colors are reserved for the system.)
C NOTE: There are some peculiar graphics adapters out there, and
C even more peculiar drivers. The default colors have been
C tweeked to appear unique in either the upper 6 or the lower
C 6 bits of each byte. If you don't like what you see, you
C may modify the DATA statement for RGB16. It may also be
C necessary to change PARAMETER CNORM from 255 to 63.
C
C Default device name: None (the device name, if specified, is ignored).
C
C View surface dimensions: Depends on monitor, typical 7.5x10 inches
C
C Resolution: Depends on graphics card and Windows95 driver.
C
C Input capability: Mouse position, must be followed by a keyboard key.
C
C File format: None.
C
C Obtaining hardcopy: via Windows95, "File/Print" menu choice.
C-----------------------------------------------------------------------
C Notes:
C Up to MAXDEV "devices" may be open at once. ACTIVE is the number
C of the currently selected device (1 if no devices are open).
C STATE(i) is 0 if device i is not open, 1 if it is open but with
C no current picture, or 2 if it is open with a current picture.
C-----------------------------------------------------------------------
EXTERNAL GRW900, GRW901
INTEGER MAXDEV
REAL*4 CNORM
PARAMETER (MAXDEV=8, CNORM=255.)
TYPE (xycoord) XY
C
CHARACTER CMSG*10, WINTITLE*80
INTEGER MX(0:4), MY(0:4), MXX(MAXDEV), MXY(MAXDEV), MXC(MAXDEV),&
& I, ACTIVE,IUNIT(MAXDEV), STATE(0:MAXDEV), NPIC(MAXDEV)
INTEGER*4 IRGB, RGB(0:235,MAXDEV), RGB16(0:15), RGB236(0:235)
INTEGER*2 I2STAT, I2X0, I2Y0, I2X1, I2Y1, DASHLINE(5), ICOLOR, &
& CBITS(MAXDEV), IX(1), IY(1), IC(1)
INTEGER*4 I4STAT, I4X, I4Y, IXREF, IYREF, BAND, EVENT, IBUF
LOGICAL FIRST, QFIRST(MAXDEV), LPOS
SAVE FIRST, QFIRST, ACTIVE, STATE, XY, MXX, MXY, MXC, IUNIT, RGB, &
& ICOLOR, NPIC, MX, MY, DASHLINE, CBITS, RGB16
DATA FIRST, QFIRST, ACTIVE, STATE(0:MAXDEV)/ &
& .TRUE., MAXDEV*.TRUE., 1, -1, MAXDEV*0/
DATA MX, MY/ 0, 640, 800, 1024, 1280, &
& 0, 480, 640, 768, 1024/
DATA DASHLINE/#FFFF, #FF80, #FC30, #CCCC, #FCCC/
C
C Following data statement provides unique colors on all tested adapters
DATA RGB16(0:15)/0, #FFFFFF, #0000FF, #00FF00, #FF0000, #FFFF00, &
& #FF00FF, #00FFFF, #005FFF, #00FFAA, #AAFF00, #FF9300, #FF0093, &
& #5F00FF, #555555, #AAAAAA/
C
C---
C Initialize first 16 RGB values and gray scale for all windows
IF (FIRST) THEN
FIRST = .FALSE.
DO ICOLOR=0,15
DO I=1,MAXDEV
RGB(ICOLOR,I) = RGB16(ICOLOR)
END DO
END DO
IRGB = #020202
DO ICOLOR=16,235
IRGB = IRGB + #010101
DO I=1,MAXDEV
RGB(ICOLOR,I) = IRGB
END DO
END DO
ICOLOR = 1
DO I=1,MAXDEV
CBITS(I) = #0F
END DO
END IF
C
SELECT CASE (IFUNC)
C
CASE (1)
C--- IFUNC = 1, Return device name.-------------------------------------
SELECT CASE (MODE)
CASE (1)
CHR = 'WV (Windows95, 640x480)'
CASE (2)
CHR = 'WS (Windows95, 800x600)'
CASE (3)
CHR = 'WX (Windows95, 1024x768)'
CASE (4)
CHR = 'WZ (Windows95, 1280x1024)'
CASE DEFAULT
CHR = 'W9 (Windows95, mode from environment)'
END SELECT
LCHR = LEN_TRIM(CHR)
C
CASE (2)
C--- IFUNC = 2, Return physical min and max for plot device, and range
C of color indices.---------------------------------------
IF (QFIRST(ACTIVE)) THEN
MXX(ACTIVE) = MX(MODE)
MXY(ACTIVE) = MY(MODE)
MXC(ACTIVE) = 236
CALL GRW900(ACTIVE, MXX, MXY, MXC, QFIRST)
END IF
RBUF(1) = 0.
RBUF(2) = MXX(ACTIVE)
RBUF(3) = 0.
RBUF(4) = MXY(ACTIVE)
RBUF(5) = 0.
RBUF(6) = MXC(ACTIVE)
NBUF = 6
C
CASE (3)
C--- IFUNC = 3, Return device resolution. ------------------------------
C Divide the number of pixels on screen by a typical screen size in
C inches.
IF (QFIRST(ACTIVE)) THEN
MXX(ACTIVE) = MX(MODE)
MXY(ACTIVE) = MY(MODE)
MXC(ACTIVE) = 236
CALL GRW900(ACTIVE, MXX, MXY, MXC, QFIRST)
END IF
RBUF(1) = FLOAT(MXX(ACTIVE)+1)/10.
RBUF(2) = FLOAT(MXY(ACTIVE)+1)/7.5
RBUF(3) = 1.0
NBUF = 3
C
CASE (4)
C--- IFUNC = 4, Return misc device info. -------------------------------
C (This device is Interactive, Cursor, No dashed lines, No area fill,
C No thick lines, Rectangle fill, Pixel primative, No ?, querY color
C representation, No markers)
CHR = 'ICNNNRPNYN'
LCHR = 10
C
CASE (5)
C--- IFUNC = 5, Return default file name. ------------------------------
CHR = 'PGPLOT Graphics Window'
LCHR = LEN_TRIM(CHR)
C
CASE (6)
C--- IFUNC = 6, Return default physical size of plot. ------------------
IF (QFIRST(ACTIVE)) THEN
MXX(ACTIVE) = MX(MODE)
MXY(ACTIVE) = MY(MODE)
MXC(ACTIVE) = 236
CALL GRW900(ACTIVE, MXX, MXY, MXC, QFIRST)
END IF
RBUF(1) = 0.
RBUF(2) = MXX(ACTIVE)
RBUF(3) = 0.
RBUF(4) = MXY(ACTIVE)
NBUF = 4
C
CASE (7)
C--- IFUNC = 7, Return misc defaults. ----------------------------------
RBUF(1) = 1.
NBUF = 1
C
CASE (8)
C--- IFUNC = 8, Select plot. -------------------------------------------
I = NINT(RBUF(2))
IF (I.GE.1 .AND. I.LE.MAXDEV .AND. STATE(I).GT.0) THEN
IF (I .NE. ACTIVE) THEN
ACTIVE = I
I4STAT = SETACTIVEQQ(IUNIT(ACTIVE))
I4STAT = FOCUSQQ(IUNIT(ACTIVE))
DO I=0,235
RGB236(I) = RGB(I,ACTIVE)
END DO
I4STAT = REMAPALLPALETTE(RGB236)
I2STAT = SETCOLOR(ICOLOR)
END IF
ELSE
CALL GRWARN('invalid or unopened graphics window in W9DRIV')
END IF
C
CASE (9)
C--- IFUNC = 9, Open workstation. --------------------------------------
I = 0
DO WHILE (I.LE.MAXDEV .AND. STATE(I).NE.0)
I = I + 1
END DO
IF (I .GE. MAXDEV) THEN
CALL GRWARN('maximum number of graphics windows exceeded')
RBUF(1) = 0.
RBUF(2) = 0.
ELSE
ACTIVE = I
RBUF(1) = ACTIVE
RBUF(2) = 1.
C Initialize this window in requested mode, and open it
MXX(ACTIVE) = MX(MODE)
MXY(ACTIVE) = MY(MODE)
MXC(ACTIVE) = 236
CALL GRW900(ACTIVE, MXX, MXY, MXC, QFIRST)
CALL GRGLUN(IUNIT(ACTIVE))
WRITE (WINTITLE, '(A,I2)') CHR(:LCHR)//', #', ACTIVE
OPEN (IUNIT(ACTIVE), FILE='USER', TITLE=WINTITLE(:LCHR+5))
DO I=0,235
RGB236(I) = RGB(I,ACTIVE)
END DO
I4STAT = REMAPALLPALETTE(RGB236)
I2STAT = SETCOLOR(ICOLOR)
STATE(ACTIVE) = 1
NPIC(ACTIVE) = 0
END IF
NBUF = 2
C
CASE (10)
C--- IFUNC=10, Close workstation. --------------------------------------
IF (STATE(ACTIVE) .GT. 0) THEN
print ('(A,I2)'), ' Type <RETURN> to close graphics '// &
& 'window #',active
read *
CLOSE (IUNIT(ACTIVE))
STATE(ACTIVE) = 0
QFIRST(ACTIVE) = .TRUE.
END IF
C
CASE (11)
C--- IFUNC=11, Begin picture. ------------------------------------------
IF(NPIC(ACTIVE) .EQ. 0) THEN
CALL CLEARSCREEN($GCLEARSCREEN)
END IF
STATE(ACTIVE) = 2
NPIC(ACTIVE) = NPIC(ACTIVE) + 1
I4STAT = SETACTIVEQQ(IUNIT(ACTIVE))
I4STAT = FOCUSQQ(IUNIT(ACTIVE))
C
CASE (12)
C--- IFUNC=12, Draw line. ----------------------------------------------
I2X0 = NINT(RBUF(1))
I2Y0 = MXY(ACTIVE) - NINT(RBUF(2))
CALL MOVETO(I2X0, I2Y0, XY)
I2X1 = NINT(RBUF(3))
I2Y1 = MXY(ACTIVE) - NINT(RBUF(4))
I2STAT = LINETO(I2X1, I2Y1)
C
CASE (13)
C--- IFUNC=13, Draw dot. -----------------------------------------------
I2X0 = NINT(RBUF(1))
I2Y0 = MXY(ACTIVE) - NINT(RBUF(2))
I4STAT = SETPIXEL(I2X0, I2Y0)
C
CASE (14)
C--- IFUNC=14, End picture. --------------------------------------------
IF (STATE(ACTIVE) .GT. 0) STATE(ACTIVE) = 1
NPIC(ACTIVE) = 0
C
CASE (15)
C--- IFUNC=15, Select color index. -------------------------------------
ICOLOR = MIN(MXC(ACTIVE), MAX(0, NINT(RBUF(1))))
I2STAT = SETCOLOR(ICOLOR)
C
CASE (16)
C--- IFUNC=16, Flush buffer. -------------------------------------------
C
CASE (17)
C--- IFUNC=17, Read cursor (mouse) AND keystroke -----------------------
I4X = NINT(RBUF(1))
I4Y = MXY(ACTIVE) - NINT(RBUF(2))
IF (NBUF .GE. 6) THEN
C Support for multiple forms of cursor
IXREF = NINT(RBUF(3))
IYREF = MXY(ACTIVE) - NINT(RBUF(4))
BAND = NINT(RBUF(5))
LPOS = RBUF(6) .GT. 0.
ELSE
C Simple crosshair cursor
IXREF = I4X
IYREF = I4Y
BAND = 0
LPOS = .TRUE.
END IF
C
C Set color index, for exclusive-ORing
ICOLOR = SETCOLOR(CBITS(ACTIVE))
I4STAT = SETWRITEMODE($GXOR)
C Initialize mouse routine by calling with fake arguments
CALL GRW901(-BAND, MXX(ACTIVE), MXY(ACTIVE), IXREF, IYREF)
C Initialize position of cursor by simulating mouse button click
IF (LPOS) CALL GRW901(IUNIT(ACTIVE), MOUSE$MOVE, 0, I4X, I4Y)
C Activate mouse callback routine
EVENT = MOUSE$MOVE
I4STAT = REGISTERMOUSEEVENT(IUNIT(ACTIVE), EVENT, GRW901)
C Wait for a keystroke
CHR(1:1) = GETCHARQQ()
C
C A key has been struck; turn off mouse, get position, restore color
I4STAT = UNREGISTERMOUSEEVENT(IUNIT(ACTIVE), EVENT)
CALL GRW901(0, 0, 0, I4X, I4Y)
I4STAT = SETWRITEMODE($GPSET)
I2STAT = SETCOLOR(ICOLOR)
C Return results
LCHR = 1
RBUF(1) = I4X
RBUF(2) = MXY(ACTIVE) - I4Y
NBUF = 2
C
CASE (18)
C--- IFUNC=18, Erase alpha screen. -------------------------------------
C
CASE (19)
C--- IFUNC=19, Set line style. -----------------------------------------
C Note: not likely to be called because IFUNC=4 returns "No dashed lines"
I = MIN(5, MAX(0, NINT(RBUF(1))))
CALL SETLINESTYLE(DASHLINE(I))
C
C--- IFUNC=20, Polygon fill. -------------------------------------------
C
CASE (21)
C--- IFUNC=21, Set color representation. -------------------------------
I = NINT(RBUF(1))
IF (I.GE.0 .AND. I.LE.MXC(ACTIVE)) THEN
ICOLOR = I
IRGB = NINT(RBUF(2)*CNORM) .OR. &
& ISHFT(NINT(RBUF(3)*CNORM), 8) .OR. &
& ISHFT(NINT(RBUF(4)*CNORM),16)
RGB(I,ACTIVE) = IRGB
CBITS(ACTIVE) = CBITS(ACTIVE) .OR. ICOLOR
I4STAT = REMAPPALETTERGB(I, IRGB)
END IF
C
C--- IFUNC=22, Set line width. -----------------------------------------
C
C--- IFUNC=23, Escape. -------------------------------------------------
C
CASE (24)
C--- IFUNC=24, Rectangle fill. -----------------------------------------
I2X0 = NINT(RBUF(1))
I2Y0 = MXY(ACTIVE) - NINT(RBUF(2))
I2X1 = NINT(RBUF(3))
I2Y1 = MXY(ACTIVE) - NINT(RBUF(4))
I2STAT = RECTANGLE($GFILLINTERIOR, I2X0, I2Y0, I2X1, I2Y1)
C
C--- IFUNC=25, Set fill pattern. ---------------------------------------
C
CASE (26)
C--- IFUNC=26, Line of pixels. -----------------------------------------
IY(1) = MXY(ACTIVE) - NINT(RBUF(2))
IF (IY(1).GE.0 .AND. IY(1).LE.MXY(ACTIVE)) THEN
IX(1) = NINT(RBUF(1))
IBUF = 3
IF (IX(1) .LT. 0) THEN
IBUF = 3 - IX(1)
IX(1) = 0
END IF
DO WHILE (IBUF.LE.NBUF .AND. I2X0.LE.MXX(ACTIVE))
IC(1) = MIN(MXC(ACTIVE), MAX(0, NINT(RBUF(IBUF))))
CALL SETPIXELS(1, IX, IY, IC)
IBUF = IBUF + 1
IX(1) = IX(1) + 1
END DO
END IF
C
C--- IFUNC=27, Scaling info --------------------------------------------
C
C--- IFUNC=28, Draw marker ---------------------------------------------
C
CASE (29)
C--- IFUNC=29, Query color representation.------------------------------
I = NINT(RBUF(1))
IRGB = RGB(I,ACTIVE)
RBUF(2) = FLOAT(IAND(IRGB, #FF))/CNORM
RBUF(3) = FLOAT(IAND(ISHFT(IRGB,-8), #FF))/CNORM
RBUF(4) = FLOAT(IAND(ISHFT(IRGB,-16), #FF))/CNORM
NBUF = 4
C
CASE DEFAULT
C--- Unimplemented Function
WRITE (CMSG, '(I10)') IFUNC
CALL GRWARN('Unimplemented function in Win95 device driver:'// &
& CMSG)
NBUF = -1
END SELECT
RETURN
END
C*********
SUBROUTINE GRW900(I, MXX, MXY, MXC, QFIRST)
USE MSFLIB
IMPLICIT NONE
INTEGER I, MXX(*), MXY(*), MXC(*)
LOGICAL QFIRST(*)
C---
TYPE (WINDOWCONFIG) WC
INTEGER TR$L
LOGICAL STATUS
CHARACTER TR$VID*128
C---
C Set default window configuration
C Try to set to input values of MXX, MXY, default 800x600
IF (MXX(I).LE.1 .OR. MXY(I).LE.1) THEN
MXX(I) = 800
MXY(I) = 600
MXC(I) = 256
CALL GRGENV('VIDEO', TR$VID, TR$L)
IF (TR$L .GT. 0) THEN
C There is a "PGPLOT_VIDEO" parameter in the Environment
IF( TR$VID(1:1) .EQ. 'V') THEN
C Set to VGA resolution
MXX(I) = 640
MXY(I) = 480
ELSE IF (TR$VID(1:1) .EQ. 'X') THEN
MXX(I) = 1024
MXY(I) = 768
ELSE IF (TR$VID(1:1) .EQ. 'Z') THEN
MXX(I) = 1280
MXY(I) = 1024
END IF
END IF
END IF
C
WC.numxpixels = MXX(I)
WC.numypixels = MXY(I)
WC.numcolors = MXC(I)
WC.numtextcols = -1
WC.numtextrows = -1
WC.fontsize = -1
WC.title = 'PGPLOT'C
STATUS = SETWINDOWCONFIG(WC)
IF(.NOT.STATUS) STATUS = SETWINDOWCONFIG(WC)
C
MXX(I) = WC.numxpixels - 1
MXY(I) = WC.numypixels - 1
MXC(I) = WC.numcolors - 1
QFIRST(I) = .FALSE.
RETURN
END
C*********
RECURSIVE SUBROUTINE GRW901(IUNIT,EVENT,KEYSTATE,XMOUSE,YMOUSE)
USE MSFLIB
IMPLICIT NONE
INTEGER IUNIT, EVENT, KEYSTATE, XMOUSE, YMOUSE
C
C Callback routine for mouse events, specific to Windows95
C Note: cursor band modes implemented in software
C
C 1996-Apr-26 - P.A.Seeger
C--
RECORD /xycoord/ XY
INTEGER*2 BAND, LENGTH, IX0, IY0, IX1, IY1, IX2, IY2, IXR, IYR
INTEGER*4 DUMMY
LOGICAL INITIUS, FINIS
DATA INITIUS /.TRUE./
SAVE INITIUS,BAND,LENGTH,IX0,IY0,IX1,IY1,IX2,IY2,IXR,IYR
C
C Disable mouse movement interrupts while in callback routine
IF (IUNIT .GT. 0) DUMMY = UNREGISTERMOUSEEVENT(IUNIT, MOUSE$MOVE)
C
FINIS = IUNIT.EQ.0 .AND. EVENT.EQ.0 .AND. KEYSTATE.EQ.0
IF (IUNIT.LE.0 .AND. .NOT.FINIS) THEN
INITIUS = .TRUE.
C Get initialization parameters from callback calling sequence
BAND = -IUNIT
IXR = XMOUSE
IYR = YMOUSE
IX0 = IXR
IY0 = IYR
C Extract parameters for length of cursor lines
IF (BAND .EQ. 0) THEN
C Simple crosshair cursor
LENGTH = MAX(EVENT, KEYSTATE)/80 + 3
ELSE
LENGTH = 0
IX1 = 0
IX2 = 0
IY1 = 0
IY2 = 0
C Modes with full width horizontal line(s)
IF (BAND.EQ.3 .OR. BAND.EQ.5 .OR. BAND.EQ.7) IX2 = EVENT
C Modes with full height vertical line(s)
IF (BAND.EQ.4 .OR. BAND.EQ.6 .OR. BAND.EQ.7) IY2 = KEYSTATE
IF (BAND .EQ. 3) THEN
C Draw fixed horizontal line at anchor
CALL MOVETO(IX1, IYR, XY)
DUMMY = LINETO(IX2, IYR )
ELSE IF (BAND .EQ. 4) THEN
C Draw fixed vertical line at anchor
CALL MOVETO(IXR, IY1, XY)
DUMMY = LINETO(IXR, IY2 )
END IF
END IF
GO TO 700
END IF
C
IF (.NOT. INITIUS) THEN
C This is NOT an initial call, so need to erase previous cursor
C by rewriting it in complementary color mode
IF (BAND .EQ. 1) THEN
CALL MOVETO(IXR, IYR, XY)
DUMMY = LINETO(IX0, IY0 )
ELSE IF (BAND .EQ. 2) THEN
DUMMY = RECTANGLE($GBORDER, IXR, IYR, IX0, IY0)
ELSE
IF (IY2 .NE. IY1) THEN
CALL MOVETO(IX0, IY1, XY)
DUMMY = LINETO(IX0, IY2 )
END IF
IF (IX2 .NE. IX1) THEN
CALL MOVETO(IX1, IY0, XY)
DUMMY = LINETO(IX2, IY0 )
END IF
END IF
END IF
C
IF (FINIS) THEN
C Termination call, return latest mouse location
XMOUSE = IX0
YMOUSE = IY0
IF (BAND .EQ. 3) THEN
C Erase fixed horizontal line at anchor
CALL MOVETO(IX1, IYR, XY)
DUMMY = LINETO(IX2, IYR )
ELSE IF (BAND .EQ. 4) THEN
C Erase fixed vertical line at anchor
CALL MOVETO(IXR, IY1, XY)
DUMMY = LINETO(IXR, IY2 )
END IF
INITIUS = .TRUE.
GO TO 700
END IF
C
C Save new cursor location
IX0 = XMOUSE
IY0 = YMOUSE
IF (BAND .EQ. 0) THEN
C Find ends of cursor line segments
IX1 = IX0 - LENGTH
IX2 = IX0 + LENGTH
IY1 = IY0 - LENGTH
IY2 = IY0 + LENGTH
END IF
C
C Now draw line, box, or cursor in complementary color
INITIUS = .FALSE.
IF (BAND .EQ. 1) THEN
C Line from anchor to cursor location
CALL MOVETO(IXR, IYR, XY)
DUMMY = LINETO(IX0, IY0 )
ELSE IF (BAND .EQ. 2) THEN
C Box with vertices at anchor and cursor location
DUMMY = RECTANGLE($GBORDER, IXR, IYR, IX0, IY0)
ELSE
IF (IY2 .NE. IY1) THEN
C Draw a horizontal line (or segment)
CALL MOVETO(IX0, IY1, XY)
DUMMY = LINETO(IX0, IY2)
END IF
IF (IX2 .NE. IX1) THEN
C Draw a vertical line (or segment)
CALL MOVETO(IX1, IY0, XY)
DUMMY = LINETO(IX2, IY0)
END IF
END IF
C
700 CONTINUE
IF (IUNIT.GT.0 .AND. .NOT.INITIUS) &
& DUMMY = REGISTERMOUSEEVENT(IUNIT, MOUSE$MOVE, GRW901)
RETURN
END
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