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  Like CURSOR but with a full-screen cursor and continuous readout option


  This program is designed to essentially mimic the IDL CURSOR command,
  but with the additional options of continuously printing out the data
  values of the cursor's position, and using a full-screen cursor rather
  than a small cross cursor. The full screen cursor uses OPLOT and
  X-windows graphics masking to emulate the cursor.
      One difference is that IF the PRINT keyword is set but the DOWN,
  WAIT, CHANGE, or NOWAIT keywords are not set, then the leftmost mouse
  button will print a "newline" line-feed, but not exit.
  Mac users may need to set their X windows preferences to (1) Emulate 3
    button mouse and (2) Click through inactive windows, to make cursor
    work properly.

Calling Sequence

  RDPLOT [, X, Y] [, WaitFlag] [, /DATA | /DEVICE | /NORMAL]
      [, /NOWAIT | /WAIT | /DOWN | /CHANGE]

Required Inputs


Optional Inputs

  WAITFLAG = Uses the same table as the intrinsic CURSOR command, But note
that unlike the CURSOR command, there is no UP keyword.
WaitFlag=0 sets the NOWAIT keyword
WaitFlag=1 sets the WAIT keyword {default}
WaitFlag=2 sets the CHANGE keyword
WaitFlag=3 sets the DOWN keyword

Optional Outputs

    X - a named variable to receive the final cursor X position, scalar
        or vector (if /ACCUMULATE is set)
    Y - a named variable to receive the final cursor Y position, scalar
        or vector (if /ACCUMULATE is set)

Optional Keyword Input Parameters

  /DATA - data coordinates are displayed and returned.
  /DEVICE - device coordinates are displayed and returned.
  /NORMAL - normal coordinates are displayed and returned.
      Default is to use DATA coordinates if available (see notes).
  /NOWAIT = if non-zero the routine will immediately return the cursor's
      present position.
  /WAIT - if non-zero will wait for a mouse key click before returning. If
      cursor key is already down, then procedure immediately exits.
  /DOWN - equivalent to WAIT *except* that if the mouse key is already down
      when the procedure is called, the procedure will wait until the mouse
      key is clicked down again.
  /CHANGE - returns when the mouse is moved OR a key is clicked up or down.
  PRINT = if non-zero will continuously print out (at the terminal) the data
      values of the cursor's position. If PRINT>1, program will printout a
      brief header describing the mouse button functions. However, note that
      the button functions are overridden if any of the DOWN, WAIT, or
      CHANGE values are non-zero.
  XTITLE = label used to describe the values of the abscissa if PRINT>0.
  YTITLE = label used to describe the values of the ordinate if PRINT>0.
  XVALUES = a vector corresponding to the values to be printed when the
PRINT keyword is set. This allows the user the option of printing
out other values rather than the default X coordinate position of
the cursor. E.g., if XVALUES is a string vector of dates such as
['May 1', 'May 2', ...], then those dates will be printed rather than
the X value of the cursor's position: if X=1 then 'May 2' would be
printed, etc. This requires that the values of the X coordinate read
by the cursor must be positive (can't access negative elements).
      If XVALUES=-1, then NO values for X will be printed.
  YVALUES = analogous to the XVALUES keyword.
  /FULLCURSOR - if non-zero default cursor is blanked out and full-screen
      (or full plot window, depending on the value of NOCLIP) lines are
      drawn; their intersecton is centered on the cursor position.
  /NOCLIP - if non-zero will make a full-screen cursor, otherwise it will
      default to the value in !P.NOCLIP.
  LINESTYLE = style of line that makes the full-screen cursor.
  THICK = thickness of the line that makes the full-screen cursor.
  COLOR = color of the full-screen cursor.
  BACKGROUND = color of the background of the plot device. If this has
      been set to !P.BackGround, then this keyword is unnecessary.
  /CROSS = if non-zero will show the regular cross AND full screen cursors.
  /ACCUMULATE - all of the positions for which the left button was
      clicked are stored in the X and Y variables. Has no effect if X and Y
      are not present.
  CURSOR_STANDARD = this keyword can be used to select the cursor
      appearance if /CROSS is set and will set the cursor to this value
      when the full-screen cursor is turned off if /FULLCURSOR has been
      set. See IDL help for the DEVICE keyword CURSOR_STANDARD to see
      possible cursors for X Windows and MS Windows. The default
      behavior, if this keyword is not set, is to set the cursor to the
      window system's default cursor, which might not be the user's
      preferred cursor.
  ERR = returns the most recent value of the !mouse.button value.


  Note that this procedure does not allow the "UP" keyword/flag...which
  doesn't seem to work too well in the origianl CURSOR version anyway.
  Note: this might have been the case back in the day, but Robishaw
  hasn't experienced any problems with CURSOR, /UP in the last 10
  years. Even so, it would be somewhat tricky to implement the /UP
  behavior in this routine, which explains why it's still missing.
  If a data coordinate system has not been established, then RDPLOT
  will create one identical to the device coordinate system. Note that
  this kluge is required even if the user specified /NORMAL coordinates,
  since RDPLOT makes use of the OPLOT procedure. This new data
  coordinate system is effectively "erased" (!X.CRange and !Y.CRange are
  both set to zero) upon exit of the routine so as to not change the plot
  status from the user's point of view.
  Only tested on X-windows systems. If this program is interrupted, the
  graphics function might be left in a non-standard state; in that case,
  run the program RESET_RDPLOT to return the standard graphics functions,
  or type the command: DEVICE, /CURSOR_CROSS, SET_GRAPHICS=3, BYPASS=0
  Robishaw added /ACCUMULATE keyword to pass back all the positions at
  which the mouse was left-clicked. In addition, the value of the exit
  click is returned unless the cursor did not change position between the
  last left-click and the exit click.


  Basically is a bells-n-whistles version of the CURSOR procedure. All
  the details are covered in the above discussion of the keywords.


  A silly, but informative one:
  Months = ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', $
            'Aug', 'Sep', 'Oct', 'Nov', 'Dec']
  plot, indgen(12), xrange=[-5, 15]
  rdplot, /FULL, /PRINT, $
      XTITLE='Month: ', YTITLE='Y-value per month = ', $
  If your plot has a non-black background color, be sure to set either
  !p.background or the BACKGROUND keyword. Here are examples of how to
  use a blue full-screen cursor on a plot with a red background and
  yellow axes and data. First, deal with color decomposition off:
  device, decomposed=0
  tvlct, [255,255,0], [0,255,0], [0,0,255], 1
  plot, randomn(seed,1024), XSTYLE=19, PSYM=3, COLOR=2, BACK=1
  rdplot, /PRINT, /FULL, THICK=5, /NOCLIP, BACK=1, COLOR=3
  For decomposition on (TrueColor or DirectColor only):
  device, decomposed=1
  plot, randomn(seed,1024), XSTYLE=19, PSYM=3, COLOR=65535l, BACK=255l
  rdplot, /PRINT, /FULL, THICK=5, /NOCLIP, BACK=255l, COLOR=16711680l

Modification History

  Written (originally named CURFULL) by J.Wm.Parker 1993 Nov 22
  Created data coordinates if not already present, W. Landsman Nov. 93
  Added continuous printout of data values, COLOR and FULLCURSOR keywords
      (so that default is that it acts just like the cursor command).
      Changed name from CURFULL to RDPLOT. J.Wm.Parker 1994 Apr 20
  Modified (with some translation table assistance from the IDL support
      group) to correctly plot the crosshair with the desired IDL
      color using the device's translation table to determine the XOR
      function and using the BYPASS function. Added the RESET_RDPLOT
      procedure to cleanup crashes that might occur while running
      RDPLOT. Other minor changes/bug fixes. J.Wm.Parker 1994 May 21
  Modified DOWN, WAIT, CHANGE functions to behave more similar to the
      generic CURSOR procedure. J.Wm.Parker 1995 April 24
  Added XVALUES, YVALUES keywords and cleanup. J.Wm.Parker 1995 April 24
  Convert to IDL V5.0, W. Landsman July 1998
  Change !D.NCOLORS to !D.TABLE_SIZE for 24 bit displays W. Landsman May 2000
  Skip translation table for TrueColor visuals W. Landsman March 2001
  Fixed /FULLCURSOR ghosts. Fixed to properly deal with background colors
      in 24-bit visual classes (TrueColor and DirectColor). Added
      BACKGROUND keyword. Tim Robishaw 2005 Jan 27
  Added /ACCUMULATE keyword. T. Robishaw 2006 Nov 8
  Corrected following problems. When /CHANGE and /PRINT were set,
      returned X & Y were different than those printed. When /PRINT and
      /NOWAIT were set, or /PRINT and /WAIT were set and the routine was
      entered with a mouse button clicked, nothing was printed. When
      /PRINT and /DOWN were set, if routine was started with button down,
      advertised behavior was that routine would exit on next down click;
      in practice if cursor was not moved, successive down clicks had no
      effect. Now, if X is passed as an output variable, requires that Y
      is also passed, like CURSOR. Bottom line is that RDPLOT now really
      does behave like CURSOR and when /PRINT is set, the values printed
      correspond to those returned in X & Y. T. Robishaw 2006 Nov 12
  Fixed misbehavior when color decomposition was set to off for
      TrueColor and DirectColor. Now thoroughly tested on PseudoColor
      displays as well as both decomposition states for TrueColor and
      DirectColor. Also made the default cursor color white when
      decomposition is on (this has been its default value for
      decomposition off). T. Robishaw 2006 Nov 16
  Fixed misbehavior when /FULLCURSOR not set; was checking for
      non-existent variable VisualName. T. Robishaw 2007 Jul 01
  Added the CURSOR_STANDARD keyword because I hate how this routine
      changes my default cursor. Also, it was crashing when /FULL not set:
      small fix, now works. T. Robishaw 2007 Jul 03
  Fixed bug where moving mouse with button pressed or releasing button
      would return values even if DOWN was set. The checks for this were
      only being done if PRINT was set also. T.V. Wenger 2013 May 14
  Fix problem exiting when X,Y not supplied W. Landsman June 2013

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