Package org.geotools.swing.tool

Class FeatureLayerHelper

Object
InfoToolHelper
FeatureLayerHelper
All Implemented Interfaces:
EventListener, MapBoundsListener
public class FeatureLayerHelper extends InfoToolHelper
Helper class used by InfoTool to query vector features in a FeatureLayer.
Since:
2.6
Author:
Michael Bedward

  • Field Details

    • DEFAULT_DISTANCE_FRACTION

      public static final double DEFAULT_DISTANCE_FRACTION
      Default distance fraction used with line and point features. When the user clicks on the map, this tool searches for features within a rectangle of width w centred on the mouse location, where w is the average map side length multiplied by the value of this constant.
      See Also:

  • Constructor Details

    • FeatureLayerHelper

      public FeatureLayerHelper()
      No argument constructor required by the helper lookup system.

  • Method Details

    • setLayer

      public void setLayer(Layer layer)
      Sets the map layer for this helper. The layer argument must be an instance of FeatureLayer.
      Overrides:
      setLayer in class InfoToolHelper
      Parameters:
      layer - the map layer

    • isSupportedLayer

      public boolean isSupportedLayer(Layer layer)
      Description copied from class: InfoToolHelper
      Called by the helper lookup system when selecting a helper for a given layer.
      Specified by:
      isSupportedLayer in class InfoToolHelper
      Parameters:
      layer - the layer
      Returns:
      true is this helper can handle the layer

    • getInfo

      public InfoToolResult getInfo(Position2D pos) throws Exception
      Description copied from class: InfoToolHelper
      Gets layer data at the specified position. If there are no feature data at the position, an empty InfoToolResult object is returned.
      Specified by:
      getInfo in class InfoToolHelper
      Parameters:
      pos - query position
      Returns:
      layer data
      Throws:
      Exception - on error querying the layer