Class LabelPlotter
- java.lang.Object
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- uk.ac.starlink.ttools.plot2.layer.AbstractPlotter<LabelStyle>
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- uk.ac.starlink.ttools.plot2.layer.LabelPlotter
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- All Implemented Interfaces:
Plotter<LabelStyle>
public class LabelPlotter extends AbstractPlotter<LabelStyle>
Plotter that writes a text label at each graphics position.- Since:
- 15 Feb 2013
- Author:
- Mark Taylor
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Field Summary
Fields Modifier and Type Field Description static CaptionerKeySet
CAPTIONER_KEYSET
Config key set for configuring text font.static ConfigKey<java.lang.Integer>
CROWDLIMIT_KEY
Config key to control max label count in spacing region.static ConfigKey<java.lang.Integer>
SPACING_KEY
Config key to control minimum pixel label spacing.
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Constructor Summary
Constructors Constructor Description LabelPlotter()
Constructor.
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description PlotLayer
createLayer(DataGeom geom, DataSpec dataSpec, LabelStyle style)
Creates a PlotLayer based on the given geometry, data and style.LabelStyle
createStyle(ConfigMap config)
Creates a style that can be used when creating a plot layer.java.lang.String
getPlotterDescription()
Returns an XML description of this plotter.ConfigKey<?>[]
getStyleKeys()
Returns the configuration keys used to configure style for this plotter.-
Methods inherited from class uk.ac.starlink.ttools.plot2.layer.AbstractPlotter
getCoordGroup, getPlotterIcon, getPlotterName, hasReports
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Field Detail
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SPACING_KEY
public static final ConfigKey<java.lang.Integer> SPACING_KEY
Config key to control minimum pixel label spacing.
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CROWDLIMIT_KEY
public static final ConfigKey<java.lang.Integer> CROWDLIMIT_KEY
Config key to control max label count in spacing region.
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CAPTIONER_KEYSET
public static final CaptionerKeySet CAPTIONER_KEYSET
Config key set for configuring text font.
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Method Detail
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getPlotterDescription
public java.lang.String getPlotterDescription()
Description copied from interface:Plotter
Returns an XML description of this plotter.Note: really this should appear at the LayerType level.
- Returns:
- one or more <p> elements
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getStyleKeys
public ConfigKey<?>[] getStyleKeys()
Description copied from interface:Plotter
Returns the configuration keys used to configure style for this plotter. The keys in the return value are used in the map supplied to thePlotter.createStyle(uk.ac.starlink.ttools.plot2.config.ConfigMap)
method.- Returns:
- keys used when creating a style for this plotter.
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createStyle
public LabelStyle createStyle(ConfigMap config) throws ConfigException
Description copied from interface:Plotter
Creates a style that can be used when creating a plot layer. The keys that are significant in the supplied config map are those returned byPlotter.getStyleKeys()
. The return value can be used as input toPlotter.createLayer(uk.ac.starlink.ttools.plot2.DataGeom, uk.ac.starlink.ttools.plot2.data.DataSpec, S)
.- Parameters:
config
- map of style configuration items- Returns:
- plotter-specific plot style
- Throws:
ConfigException
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createLayer
public PlotLayer createLayer(DataGeom geom, DataSpec dataSpec, LabelStyle style)
Description copied from interface:Plotter
Creates a PlotLayer based on the given geometry, data and style.The
style
parameter is the result of a call toPlotter.createStyle(uk.ac.starlink.ttools.plot2.config.ConfigMap)
.The
dataSpec
parameter must contain the coordinates defined by this plotter's CoordGroup.The
pointDataGeom
parameter is only used ifgetCoordGroup()
.getPositionCount
returns a non-zero value, otherwise the plot does not have point positions.It is legal to supply null for any of the parameters; if insufficient data is supplied to generate a plot, then the method should return null.
Creating a layer should be cheap; layers may be created and not used.
- Parameters:
geom
- indicates base position coordinates and their mapping to points in the data space; if non-null, the data geom'sDataGeom.hasPosition()
method will return truedataSpec
- specifies the data required for the plotstyle
- data style as obtained fromcreateStyle
- Returns:
- new plot layer, or null if no drawing will take place
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