Nathan Conklin

Spring 2002

CS 6704

Design Patterns and Component Frameworks

Presentation

Course Context

• Design Patterns (Strategy, Visitor, UML)

• Component Frameworks (JavaBeans, COM+, .NET, CORBA)

• Midterm

• Enabling Technologies (EJB, RMI, OAA, XML, CCA, JINI, WO)

• Architectures (Web Services, 2-tier, 3-tier)

• Education & Development (Patterns in Education, XP)

• End-User Component Programming (AVS, Khoros, Visual Prog.)

• Architecture & Component Framework (P2P, STL)

• Final

Nathan Conklin, Yonqun HeQinwei Zhu, Jiunwei Chen

Spring 2002CS 6704

End-User Component Programming

Component Programming Tools

apE (Animation Production Environment)

Sieve

PV-Wave

(IBM’s Data Explorer)

Data Flow Model

• Data input

• Computational Components– Filters

– Mappers

• Data output

Data Data Reader

StatisticalModule

OutputWriter

Further Information

• AVS – http://www.avs.com/• Khoros – http://www.khoral.com/

• PV-Wave – http://www.vni.com/• IRIS Explorer – http://www.nag.co.uk/Welcome_IEC.html• OpenDX – http://www.opendx.org/• DataSplash (Tioga) – http://datasplash.cs.berkeley.edu/• apE – Dyer, D., "A dataflow toolkit for visualization," IEEE

Computer Graphics and Applications 10(4), pp. 60--69, 1990.

• Sieve – http://simon.cs.vt.edu/sieve/

Nathan Conklin

Spring 2002

CS 6704

Overview & History

• Application Visualization System– 1989 IEEE Computer Graphics and Applications

– Scientific Visualization

• Products– AVS/5, AVS/Express

– Gsharp, Toolmaster

– MUSE, OpenViz, VizWorks

Data Flow Example

• AVS Network • Modules• Ports

• Image Viewer

Modules and Ports

• Data Inputs– Some optional

– AVS data type

– Types checked as built

– Shows possible connections

• Input Parameters– How processed

– Interactively changed

• Data Outputs

Subsystems

• Network Editor

• Control Panel

• Image Viewer

• Graph Viewer

• Geometry Viewer

• Network Editor• CLI

• Module Library

• Workspace• Network

– Modules– Ports– Connections

Example Network

#!/usr/bin/avs –networkversion 5.02 (50.65 sg2)module "read field.user.0" -xy 398,22 -ex $Path/avs_library/mongomodule "volume bounds.user.1" -xy 408,172 -ex $Path/avs_library/mongomodule "geometry viewer.user.3" -xy 328,262port_connect "read field.user.0":0 "volume bounds.user.1":0port_connect "volume bounds.user.1":0 "geometry viewer.user.3":0panel "read field.user.0" -w panel -p "Top Level Stack" -xy 0,108 -wh 256,324panel "volume bounds.user.1" -w panel -p "Top Level Stack" -xy 0,108 -wh 138,196panel "geometry viewer.user.3!display" -w container -p ui -xy 732,469 -wh 542,515manipulator "read field.user.0:Read Field Browser" -w browser -p "read field.user.0"

-xy 10,10 -wh 236,194manipulator "volume bounds.user.1:Colored Bounds" -w toggle -p "volume

bounds.user.1" -xy 10,164 -wh 118,22manipulator "geometry viewer.user.3":"Update Always" -w nonemanipulator "geometry viewer.user.3":"Update Image" -w none

Control Panel

Image Viewer

Graph Viewer

Geometry Viewer

Custom Modules

• International AVS Centre– http://www.iavsc.org/– AVS Community

• Documentation

• News

– Module Repository• Source

• Documentation

Module Generator

• Generates Skeleton Modules– Source in C or FORTRAN– User can customize the module interface– Reserved areas for user-supplied code

• Subroutine Modules– Module initialized and process sleeps– AVS Flow Executive wakes module– Module computes and returns output data

• Coroutine Modules– Active, autonomous modules– Continually processing and passing data– Typically used for simulations

Further Information

• Center for Scientific Visualization and Animation

• Director - Ron Kriz (rkriz@vt.edu)

• Sun Workstations– pluto.sv.vt.edu– venus.sv.vt.edu

• ESM 4714