###
Arguments

####
X, Y

The *
X*
and/or *
Y*
parameters define the vertices of the symbol as offsets from the data point in units of approximately the size of a character. In the case of a vector drawn symbol, the symbol is formed by connecting the vertices in order. If only one argument is specified, it must be a (2, *
N*
) array of vertices, with element [0, *
i*
] containing the X coordinate of the vertex, and element [1, *
i*
] containing the Y. If both arguments are provided, *
X*
contains only the X coordinates.

###
Keywords

####
COLOR

The color used to draw the symbols, or used to fill the polygon. The default color is the same as the line color.

####
FILL

Set this
keyword to fill the polygon defined by the vertices. If FILL is not set, lines are drawn connecting the vertices.

####
THICK

The thickness of the lines used in drawing the symbol. The default thickness is 1.0.

###
Example

Make a large, diamond-shaped plotting symbol. Define the vectors of X values by entering:

X = [-6, 0, 6, 0, -6]

Define the vectors of Y values by entering:

Y = [0, 6, 0, -6, 0]

Now call USERSYM to create the new plotting symbol 8. Enter:

USERSYM, X, Y

Generate a simple plot to test the plotting symbol by entering:

PLOT, FINDGEN(20), PSYM = 8