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PLOTSYM

PLOTSYM

Name


    PLOTSYM

Purpose


    Define useful plotting symbols not in the standard !PSYM definitions.

Explanation


    After a symbol has been defined with PLOTSYM, a plotting command should
    follow with either PSYM = 8 or !P.PSYM = 8 (see USERSYM)
    For additional rotationally symmetric plotting symbols, see VSYM.PRO
    Also see CGSYMCAT in the/coyote directory.

Calling Sequence


    PLOTSYM, PSYM,[ PSIZE, /FILL, THICK=, COLOR=]

Inputs


    PSYM - The following integer values of PSYM will create the
            corresponding plot symbols
    0 - circle
    1 - downward arrow (upper limit), base of arrow begins at plot value value
    2 - upward arrow (lower limt)
    3 - 5 pointed star
    4 - triangle
    5 - upside down triangle
    6 - left pointing arrow
    7 - right pointing arrow
    8 - square
    Arrows are defined such that their base begins at their origin.

Optional Inputs


    PSIZE - Size of the plotting symbol in multiples of the default size
              (default PSIZE=1). Does not need to be an integer

Optional Input Keyword


    FILL - Parameter indicating whether to fill the symbol (see USERSYM)
            The default is 0, unfilled symbol. Does not affect arrows
            or character symbols.
    THICK - Thickness of unfilled symbols. Default is 1.
    COLOR - Color of the symbols, Default is !P.color

Outputs


    None

Examples


    Plot Y vs. X with filled stars as the symbol, twice the default size
    IDL> PLOTSYM, 3 ,2, /FILL ;Plotting symbol is a filled star,
                                      ;twice default size
    IDL> PLOT,X,Y,PSYM=8 ;Set PSYM = 8 to get star symbol
    Now plot Y vs. X with an open circle as the symbol
      IDL> PLOTSYM, 0 ;Plotting symbol is a circle
      IDL> PLOT,X,Y,PSYM=8

Method


    Appropriate X,Y vectors are used to define the symbol and passed to the
    USERSYM command.

Revision History


      Written W. Landsman June 1992
      18-JAN-1996 Added a square symbol, HCW.
      98Aug20 Added keyword thick parameter - RCB.
      April 2001 Added COLOR keyword WBL



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