Section: 5.6.1 Using VisAD Displays in the IDV

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5.6.1 Using VisAD Displays in the IDV

The IDV uses the VisAD Display system to render data in displays.

Overview of VisAD Display System

An overview of the VisAD Display system is found here.

DisplayMaster/Displayable

The IDV encapulates the building of displays and data depictions using a set of classes in ucar.visad.display.

The DisplayMaster class is a wrapper around a visad.DisplayImpl and manages a list of Displayable objects. The ucar.unidata.view.geoloc.MapProjectionDisplay is the most commonly used DisplayMaster in the IDV.
The Displayable class provides support for encapsulating one or more displayed data objects together with their display-dependent state.
The DisplayableData class holds a visad.DataReference, a set of visad.ScalarMap-s and a visad.DataRenderer that control the depiction of the Data in the display.
Displayable subclasses used in the IDV include:
- ucar.visad.display.Displayable
  - ucar.visad.display.CompositeDisplayable
  - ucar.visad.display.DisplayableData
    - ucar.visad.display.RGBDisplayable
      - ucar.visad.display.Grid2DDisplayable
      - ucar.visad.display.IsoSurface
      - ucar.visad.display.TrackDisplayable
      - ucar.visad.display.VolumeDisplayable
      - ucar.visad.display.FlowDisplayable
    - ucar.visad.display.LineDrawing
      - ucar.visad.display.ContourLines
      - ucar.visad.display.MapLines
      - ucar.visad.display.LatLonLines
      - ucar.visad.display.IndicatorPoint
      - ucar.visad.display.TextDisplayable
    - ucar.visad.display.ImageRGBDisplayable
    - ucar.visad.display.ColorScale
    - ucar.visad.display.StationModelDisplayable

ViewManagers and DisplayControls

A ViewManager is a wrapper around a DisplayMaster. A DisplayControl can hold one or more Displayable objects and these can be added to one or more ViewManagers.

MapViewManager Example

Unidata IDV Workshop for version 5.7 > Java Developer Topics > Display Controls