aux
Paints markers in a colour determined by the value of an additional data coordinate. The marker colours then represent an additional dimension of the plot. You can also adjust the transparency of the colours used. The way that data values are mapped to colours is usually controlled by options at the level of the plot itself, rather than by per-layer configuration.
Usage:
shadingN=aux auxN=<num-expr> auxnullcolorN=<rrggbb>|red|blue|... opaqueN=<number>
All the parameters listed here
affect only the relevant layer,
identified by the suffix
N
.
Associated parameters are as follows:
auxN = <num-expr>
(String)
This parameter gives a column name, fixed value, or algebraic expression for the
aux
coordinate
for layer N
.
The value is a numeric algebraic expression based on column names
as described in Section 10.
auxnullcolorN = <rrggbb>|red|blue|...
(Color)
The value may be a six-digit hexadecimal number
giving red, green and blue intensities,
e.g. "ff00ff
" for magenta.
Alternatively it may be the name of one of the
pre-defined colors.
These are currently
red
, blue
, green
, grey
, magenta
, cyan
, orange
, pink
, yellow
, black
, white
.
If the value is null, then points with a null Aux value will not be plotted at all.
[Default: grey
]
opaqueN = <number>
(Double)
[Default: 1
]