SGT Beans

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SGT Beans

• Easy-To-Use Graphics Toolkit for Java
  Applications

Donald W. Denbo UW/JISAO-NOAA/PMEL
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Introduction

• The Scientific Graphics Toolkit JavaBeans (SGT
  Beans) is a collection of Java classes that
  provide JavaBeans compatible access to SGT.

• JavaBeans makes SGTs capabilities more
  accessible to developers.

• SGT Beans reduces the learning curve needed to
  produce graphics applications.

• SGT Beans can be used with several Java IDEs
  (NetBeans, JBuilder, etc.).

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History

• SGT was developed to allow a NOAAServer user to
  interactively preview data and overlay plots.

• SGT presently used with
• OceanShare, a collaborative tool for in situ data
  visualization
• ncBrowse, a netCDF file browser
• Climate Data Portal client, an application for
  browsing distributed data

• SGT has had 17,000 downloads from 5,800 unique
  sites in 70 countries.

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Other Users of SGT

• Buoy Data, Morska Bioloska Postaja (Marine
  Biology Station)
• Computational Physics Laboratory, University of
  Edinburgh
• A Utility in JOELib, Computational Chemistry,
  University of Tübingen
• Coordinated, Interactive Data Visualization for
  Neutron Scattering Data, Mikkelson et. al.
• Dezo.org has created SGT applet plots.
• An Interactive Program for Determining Junction
  Depths in Diffused Silicon Devices, Myers et.
  al.
• Übungsunterlagen 2002, Wasserspeicher

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Outline

• SGT Bean design goals

• Demonstration of SGT Bean application.

• Architecture
• Page
• DataModel
• PanelModel

• SGT Bean code examples
• Time series. Plotting data from a netCDF file.
• Add grid plot. Refactor netCDF reader.
• Overlay vectors and add printing, PanelModel
  edit, etc.

• What Next?

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Design Goals

• Create easy-to-use JavaBeans from the SGT classes.

• JavaBeans will enable beginner and intermediate
  developers a quick entry into SGT graphics.

• SGT Beans will handle most events and provide
  tools to easily customize the appearance of the
  plot.

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SGT Beans Demonstration
Start Demonstration
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Architecture

• The SGT Beans architecture consists of Page,
  DataModel, and PanelModel JavaBeans. The
  DataModel and PanelModel beans provide the
  state information necessary for Page to create
  a graphic display.

Page
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Page JavaBean

• Visual JavaBean. Page can be added to any swing
  container.

• Page can have any number of Panels placed inside
  it. Each Panel provides an independent graphical
  display of data from the DataModel.

• The location and size of the Panels are specified
  in the PanelModel.

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Page
Page
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PanelModel JavaBean

• Non-visual JavaBean.

• PanelModel maintains

• location and size of Panels on Page

• AxisGroups and their positions on a Panel

• Legend position on a Panel

• Titles and annotation positions on a Panel

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PanelModel
PanelModel
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DataModel JavaBean

• Non-visual JavaBean.

• DataModel uses information from the PanelModel to
  specify the connection between data and
  Panel/AxisGroup.

• Contains the SGTData and Attribute objects.

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DataModel
DataModel
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SGT Beans Code Examples

• Example 1 Time Series
• Read time series from netCDF file into SimpleLine
  object.
• Create graph using Page, DataModel, and
  PanelModel.
• Load PanelModel from SBExample1.xml.

• Example 2 Add Grid Plot
• Read grid from netCDF file into SimpleGrid
  object.
• Load PanelModel from SBExample2.xml.

• Example 3 Overlay Vectors and Add Interactivity
• Read vector from netCDF file into SGTVector
  object.
• Load PanelModel from SBExample3.xml.
• Add color map Legend.
• Add printing, class browsing, zoom reset,
  PanelModel edit.

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Example 1 Time Series
SBExample1.xml
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SBExample1 class
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Constuctor
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createGraphic()
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createGraphic() (cont)
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NcSimpleReader1
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getTimeSeries() implementation
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Set shape and read Arrays
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Extract variable and axis values
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Parse time units.
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Parse time offset, create GeoDateArray
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Create SimpleLine and return
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Example 2 Add Grid Plot
SBExample2.xml
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SBExample2 modifications
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Add Grid to Page
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Add createGridAttribute()
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NcSimpleReader2 - Add getGrid()
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Get shape and x y axis data
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Adjust shape and get data grid
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Create SimpleGrid and return
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Example 3 Overlay Vectors and Add Interactivity
SBExample3.xml
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SBExample3 modifications
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Add Grid Legend
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Add Printing
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Reset Zoom and Open JClassTree
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Edit Printer Layout and PanelModel
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NcSimpleReader3 - Add getVector()
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Modify getGeoDateArray
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(No Transcript)
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What next?

• Add LayoutManager support to position Panels when
  Page is resized. This requires creating a
  graphical wizard to set SpringLayout properties.

• Add Annotation object support. Annotations
  include line, oval, point, text, and rectangle
  objects.

• Enhance IDE compatibility with popular tools.

• Continue fixing bugs, as they are found, and
  adding new useful features.

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References

• SGT Beans
• Plug and Play Scientific Graphics with SGT,
  NOAAResearch WebShop 2003, Longmont, CO
• SGT home page
• ncBrowse
• ncBrowse A Graphical netCDF/OPeNDAP Browser,
  11th ESIP Technical Meeting - OPeNDAP Session,
  Boulder, CO
• ncBrowse home page
• OceanShare
• Fisheries Oceanography Collaboration Software,
  18th AMS International Conference on IIPS,
  Orlando, FL
• Collaboration home page
• Climate Data Portal
• Climate Data Portal home page