Plots a marker of fixed shape but variable size at each position. The size is determined by an additional input data value.
The actual size of the markers depends on the setting of the
If autoscaling is off, then the basic size of each marker
is the input data value in units of pixels.
If autoscaling is on, then the data values are gathered
for all the currently visible points, and a scaling factor
is applied so that the largest ones will be a sensible size
(a few tens of pixels).
This basic size can be further adjusted with the
Currently data values of zero always correspond to marker size of zero, negative data values are not represented, and the mapping is linear. An absolute maximum of 100 pixels is also imposed on marker sizes. Other options may be introduced in future.
Note: for marker sizes that correspond to data values in data coordinates, you may find Error plotting more appropriate.
layerN=size shapeN=filled_circle|open_circle|... scaleN=<factor> autoscaleN=true|false shadingN=auto|flat|translucent|transparent|density|aux|weighted <shade-paramsN> <pos-coord-paramsN> sizeN=<num-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
<pos-coord-paramsN>give a position for each row of the input table. Their form depends on the plot geometry, i.e. which plotting command is used. For a plane plot (
plot2plane) the parameters would be
yN. The coordinate parameter values are in all cases strings interpreted as numeric expressions based on column names. These can be column names, fixed values or algebraic expressions as described in Section 10.
stilts plot2sky projection=aitoff xpix=500 ypix=250 layer1=size in1=messier.xml shading1=transparent lon1=RA lat1=DEC size1=Radius
autoscaleN = true|false(Boolean)
If auto-scaling is off, then markers will keep exactly the same screen size during pan and zoom operations; if it's on, then the visible sizes will change according to what other points are currently plotted.
Marker size is also affected by the
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.
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).
scaleN = <factor>(Double)
shadingN = auto|flat|translucent|transparent|density|aux|weighted <shade-paramsN>(ShapeMode)
shapeN = filled_circle|open_circle|...(MarkShape)
The available options are:
sizeN = <num-expr>(String)
The value is a numeric algebraic expression based on column names as described in Section 10.