uk.ac.starlink.ttools.plot2.layer
Class SpotPlotter

java.lang.Object
  extended by uk.ac.starlink.ttools.plot2.layer.AbstractPlotter<SpotPlotter.SpotStyle>
      extended by uk.ac.starlink.ttools.plot2.layer.SpotPlotter
All Implemented Interfaces:
Plotter<SpotPlotter.SpotStyle>

public class SpotPlotter
extends AbstractPlotter<SpotPlotter.SpotStyle>

Fairly minimal example plotter implementation. It paints a fixed-size marker, for which the only style configuration option is colour. Admittedly, it's not all that simple.

This implements most of the required interfaces more or less from scratch to show what's going on. Reusing infrastructure from some other existing plotters (e.g. subclassing ShapeForm) may be more sensible where appropriate.

Since:
17 Feb 2013
Author:
Mark Taylor

Nested Class Summary
static class SpotPlotter.SpotStyle
          Style implementation for spots.
 
Constructor Summary
SpotPlotter()
          Constructor.
 
Method Summary
 PlotLayer createLayer(DataGeom geom, DataSpec dataSpec, SpotPlotter.SpotStyle style)
          Creates a PlotLayer based on the given geometry, data and style.
 SpotPlotter.SpotStyle createStyle(ConfigMap config)
          Creates a style that can be used when creating a plot layer.
 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
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

SpotPlotter

public SpotPlotter()
Constructor.

Method Detail

getPlotterDescription

public 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

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 the Plotter.createStyle(uk.ac.starlink.ttools.plot2.config.ConfigMap) method.

Returns:
keys used when creating a style for this plotter.

createStyle

public SpotPlotter.SpotStyle createStyle(ConfigMap config)
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 by Plotter.getStyleKeys(). The return value can be used as input to Plotter.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

createLayer

public PlotLayer createLayer(DataGeom geom,
                             DataSpec dataSpec,
                             SpotPlotter.SpotStyle 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 to Plotter.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 if getCoordGroup(). 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's DataGeom.hasPosition() method will return true
dataSpec - specifies the data required for the plot
style - data style as obtained from createStyle
Returns:
new plot layer, or null if no drawing will take place


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