Package uk.ac.starlink.ttools.plot2.layer

Class SpotPlotter

java.lang.Object
uk.ac.starlink.ttools.plot2.layer.AbstractPlotter<SpotPlotter.SpotStyle>
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

  • Constructor Details

    • SpotPlotter

      public SpotPlotter()
      Constructor.

  • Method Details

    • 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 the CoordGroup.getBasicPositionCount() or CoordGroup.getExtraPositionCount() method from this plotter's CoordGroup return 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
      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