Draws a text label near the center of each area.You can select the font, where the labels appear in relation to the point positions, and how crowded the points have to get before they are suppressed.
This is just like a normal Label plot, but the positions are taken from an Area coordinate rather than normal positional coordinates.
layerN=arealabel texttypeN=plain|antialias|latex fontsizeN=<int-value> fontstyleN=standard|serif|mono fontweightN=plain|bold|italic|bold_italic anchorN=west|east|north|south|center colorN=<rrggbb>|red|blue|... spacingN=<pixels> crowdlimitN=<n> areaN=<area-expr> areatypeN=STC-S|POLYGON|CIRCLE|POINT|MOC-ASCII labelN=<txt-expr> inN=<table> ifmtN=<in-format> istreamN=true|false icmdN=<cmds>
All the parameters listed here
affect only the relevant layer,
identified by the suffix
stilts plot2sky reflectlon=false sex=false clon=18 clat=0 radius=36 xpix=550 ypix=600 in=countries.vot area=shape areatype=STC-S layer_1=area polymode_1=fill fast_1=false shading_1=aux aux_1=index opaque_1=2 layer_2=area polymode_2=outline shading_2=flat color_2=grey auxmap=paired auxvisible=false layer_3=arealabel label_3=name anchor_3=center color_3=black
anchorN = west|east|north|south|center(Anchor)
The available options are:
areaN = <area-expr>(String)
The value is a Area value algebraic expression based on column names as described in Section 10.
areatypeN = STC-S|POLYGON|CIRCLE|POINT|MOC-ASCII(AreaMapper)
areaNis supplied. Options are:
STC-S: Region description using STC-S syntax; see TAP 1.0, section 6. Note there are some restrictions:
<flavor>metadata are ignored, polygon winding direction is ignored (small polygons are assumed) and the
NOTconstructions are not supported. The non-standard
MOCconstruction is supported.
POLYGON: 2n-element array (
NaNpair can be used to delimit distinct polygons.
CIRCLE: 3-element array (
POINT: 2-element array (
MOC-ASCII: Region description using ASCII MOC syntax; see MOC 1.1 2.3.2. Note there are currently a few issues with MOC plotting, especially for large pixels.
colorN = <rrggbb>|red|blue|...(Color)
The standard plotting colour names are
However, many other common colour names (too many to list here)
are also understood.
The list currently contains those colour names understood
by most web browsers,
listed e.g. in the
Extended color keywords section of
the CSS3 standard.
Alternatively, a six-digit hexadecimal number RRGGBB
may be supplied,
optionally prefixed by "
#" or "
giving red, green and blue intensities,
0xff00ff" for magenta.
crowdlimitN = <n>(Integer)
It is useful for instance if you are looking at pairs of points, which will always be close together; if you set this value to 2, an isolated pair of labels can be seen, but if it's 1 then they will only be plotted when they are distant from each other, which may only happen at very high magnifications.
fontsizeN = <int-value>(Integer)
fontstyleN = standard|serif|mono(FontType)
The available options are:
fontweightN = plain|bold|italic|bold_italic(FontWeight)
The available options are:
icmdN = <cmds>(ProcessingStep)
inN. The value of this parameter is one or more of the filter commands described in Section 6.1. If more than one is given, they must be separated by semicolon characters (";"). This parameter can be repeated multiple times on the same command line to build up a list of processing steps. The sequence of commands given in this way defines the processing pipeline which is performed on the table.
Commands may alteratively be supplied in an external file,
by using the indirection character '@'.
Thus a value of "
causes the file
filename to be read for a list
of filter commands to execute. The commands in the file
may be separated by newline characters and/or semicolons,
and lines which are blank or which start with a
#' character are ignored.
ifmtN = <in-format>(String)
inN. The known formats are listed in Section 5.2.1. This flag can be used if you know what format your table is in. If it has the special value
(auto)(the default), then an attempt will be made to detect the format of the table automatically. This cannot always be done correctly however, in which case the program will exit with an error explaining which formats were attempted.
inN = <table>(StarTable)
-", meaning standard input. In this case the input format must be given explicitly using the
ifmtNparameter. Note that not all formats can be streamed in this way.
<" character at the start, or a "
|" character at the end ("
<syscmd" or "
syscmd|"). This executes the given pipeline and reads from its standard output. This will probably only work on unix-like systems.
istreamN = true|false(Boolean)
inNparameter will be read as a stream. It is necessary to give the
ifmtNparameter in this case. Depending on the required operations and processing mode, this may cause the read to fail (sometimes it is necessary to read the table more than once). It is not normally necessary to set this flag; in most cases the data will be streamed automatically if that is the best thing to do. However it can sometimes result in less resource usage when processing large files in certain formats (such as VOTable).
labelN = <txt-expr>(String)
The value is a string algebraic expression based on column names as described in Section 10.
spacingN = <pixels>(Integer)
texttypeN = plain|antialias|latex(TextSyntax)
Antialiasboth take the text at face value, but
Antialiassmooths the characters.
LaTeXinterprets the text as LaTeX source code and typesets it accordingly.
When not using LaTeX, antialiased text usually looks nicer, but can be perceptibly slower to plot. At time of writing, on MacOS antialiased text seems to be required to stop the writing coming out upside-down for non-horizontal text (MacOS java bug).