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CGTEXT

CGTEXT
  Provides a device-independent and color-model-independent way to write text into
  a graphics window. It is a wrapper to the XYOUTS command.

Categories


    Graphics
   

Params


    xloc: in, required, type=depends
      The X location of the text.
    yloc: in, required, type=depends
      The Y location of the text.
    text: in, optional, type=string
        The text to output. By default, the calling sequence of the program.
     

Keywords


    addcmd: in, optional, type=boolean, default=0
        Set this keyword to add the command to an cgWindow. Setting this keyword
        automatically sets the WINDOW keyword, but the command does not erase the
        graphics window as it would normally.
    alignment: in, optional, type=integer, default=0
        Set this keyword to indicate the alignment of the text with respect to the
        x and y location. 0 is left aligned, 0.5 is centered, and 1.0 is right aligned.
        The alignment is set to 0.5 if PLACE is set and ALIGNMENT is unspecified.
        Otherwise, the default is 0.
    charsize: in, optional, type=float, default=cgDefCharSize()
        The character size for axes annotations. Uses cgDefCharSize to select default
        character size, unless !P.Charsize is set, in which case !P.Charsize is always used.
    color: in, optional, type=string/integer/long, default="opposite"
        The color of the text. Color names are those used with cgColor.
    data: in, optional, type=boolean
        Set this keyword to indicate xloc and yloc are in data coordinates. Data coordinates
        are the default, unless DEVICE or NORMAL is set.
    device: in, optional, type=boolean
        Set this keyword to indicate xloc and yloc are in device coordinates.
    font: in, optional, type=integer, default=!P.Font
        The type of font desired. By default, !P.Font.
    map_object: in, optional, type=object
        If you are drawing on a map projection set up with Map_Proj_Init
        and using projected meter space, rather than lat/lon space, then you can use this
        keyword to provide a cgMap object that will allow you to convert the `x` and `y`
        parameters from longitude and latitude, respectively, to projected meter space
        before drawing.
    normal: in, optional, type=boolean
        Set this keyword to indicate xloc and yloc are in normalized coordinates.
    orientation: in, optional, type=float, default=0.0
        Use this keyword to specify the counterclockwise angle of rotation of the text
        in degrees from the horizontal.
    outloc: out, optional, type=various
        Only used if PLACE is set, this is a two-element array containing the xloc and yloc
        of the cursor position in the window.
    place: in, optional, type=boolean
          Set this keyword if you wish to click the cursor in the graphics window to place
          the text. If this keyword is set, you do not need to specify the `xloc` and `yloc`
          positional parameters. The first positional parameter is assumed to be the text.
          The clicked location will be returned in the `OutLoc` variable. If the `Alignment`
          keyword is not set, it will be set to 0.5 to set "center" as the default placement
          alignment. This has been modified to allow this keyword to work in a resizeable
          graphics window as well. Clicking once in the window will set the parameters so
          you don't have to click every time the window is resized.
    tt_font: in, optional, type=string
        The true-type font to use for the text. Only used if FONT=1.
    width: out, optional, type=float
        Set this keyword to a named variable in which to return the width of the text string,
        in normalized coordinate units. Note that output keyword values cannot be returned
        from the routine if the command is being executed in a cgWindow.
    window: in, optional, type=boolean
        Set this keyword to add the command to the in the current cgWindow application.
    _ref_extra: in, optional
        Any `IDL XYOutS keyword <http://www.exelisvis.com/docs/XYOUTS_Procedure.html>`
        not defined here is allowed in the program.
   
         

Examples


    Used like the IDL XYOUTS command::
      IDL> cgText, 0.5, 0.5, 'This is sample text', ALIGNMENT=0.5, /NORMAL
      IDL> cgText, /PLACE, 'Use the cursor to locate this text', COLOR='dodger blue'
     

Author


      FANNING SOFTWARE CONSULTING::
          David W. Fanning
          1645 Sheely Drive
          Fort Collins, CO 80526 USA
          Phone: 970-221-0438
          E-mail: david@idlcoyote.com
          Coyote's Guide to IDL Programming: http://www.idlcoyote.com

History


    Change History::
        Written, 19 November 2010. DWF.
        Corrected a problem with setting text color and added PLACE and OUTLOC
            keywords. 25 Nov 2010. DWF.
        Humm, that text color problem got reset to the old way! Sheesh! Fixed. 9 Dec 2010. DWF.
        Modified the way the default color is selected. Drawing with DECOMPOSED
            if possible. 30 Dec 2010. DWF.
        Keywords collected with _REF_EXTRA so WIDTH can be returned. Added WIDTH keyword. 6 Jan 2011. DWF.
        Moved setting to decomposed color before color selection process to avoid PostScript
            background problems when passed 24-bit color integers. 12 Jan 2011. DWF.
        Added Window keyword. 24 Jan 2011. DWF.
        Added ability to return WIDTH from resizeable graphics windows and added ADDCMD
              keyword. 24 Feb 2011. DWF.
        Modified error handler to restore the entry decomposition state if there is an error. 17 March 2011. DWF
        Modified to allow the user to place the text in a resizeable graphics window. 13 Dec 2011. DWF.
        Modified to use cgDefaultColor for default color selection. 24 Dec 2011. DWF.
        Modifications to the way I obtain the WIDTH when adding the command to a cgWindow. 26 Jan 2012. DWF.
        Added MAP_OBJECT keyword so that I can draw text on plots using a cgMap map coordinate object. 29 June 2012. DWF.
        Added the ability to use escape characters in plot titles to specify cgSymbol symbols. 27 July 2012. DWF.
        Added ORIENTATION keyword to make it explicit, and improved documentation. 3 Aug 2012. DWF.
       

Copyright


    Copyright (c) 2010-2012, Fanning Software Consulting, Inc.



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