XML Europe 2002 Barcelona, 21 - 23 May WebCGM DOM - External Control for Web Graphics Dave Cruikshank Technical Fellow, The Boeing Company CTO, CGM Open.

XML Europe 2002Barcelona, 21 - 23 May

WebCGM DOM - External Control for Web Graphics

Dave CruikshankTechnical Fellow, The Boeing Company

CTO, CGM Open

Ulrich LaeschePresident, Ematek Informatik GmbH


Agenda

• Background

• Application Structuring

• WebCGM Application Structures

• WebCGM DOM Requirements

• Development Status

• Example


Background

• CGM (ISO/IEC 8632)– Computer Graphics Metafile - interchange– Robust 2-dimensional graphics language– Stable – 15 years as an ISO standard– Widely supported – technical documentation,

CAD/CAM, desktop publishing, etc.– Widely profiled – Air Transport Assn, CALS,

AECMA, automotive, telecommunications, etc.


Background - CGM

Version 2 (Am1:1989)

CGM Version 1 (1987)


Defect Corrections

Republish

CGM:1992


Background - CGM

Profiles&Conformance (Am1:1994)

CGM Version 3 (1992)


Defect Corrections

Republish

CGM:1999


Background• CGM Open– Consortium formed in 1998

(www.cgmopen.org)Users Vendors IndependentsBoeingEADSBombardierUS NavyMOD UKXerox(AECMA)

ItedoSys Dev IncLarson S/WAuto-trolEmatekBentley(Corel)

NISTLofton HendersonBruce Garner


Background - WebCGM

• Based on ATA GREXCHANGE

• Extensions for application structuring

• Targeted for technical illustrations– 2D– Line art– Navigation functionality


Background - WebCGM

WebCGM V1.0 (1999)

Defect Corrections

Republish

WebCGM V1.0 Release 2 (2001)


Application Structuring

• Group graphical primitives by type

• Attach attributes to groups to support:– Linking– Information retrieval– Viewer behavior– Etc.


WebCGM Application Structure Types

Picture Body

subparagrobject gdata

layer

para

para

opt

repcho

repcho

gdata – graphicalprimitivesopt – optionalrep – repeatcho – choice

grobject gdata

repcho

grobject gdatapara

gdata


WebCGM Application Structure Attributes

• layer– id– layer Description– layer Name

• grobject– id– region– view Context– linkuri– screentip– name

• para & subpara– id– region– linkuri– screentip– content


WebCGM

• What does that buy us?– The ability to navigate through and

between illustrations• example


WebCGM

• Why a DOM?– Control over viewer behavior externally• Attributes of primitives (color, weight, font,

etc.)• Visibility of objects

– Remove some (most) of the metadata from the CGM file• Context sensitive linking• Context sensitive screen tips


WebCGM DOM requirements

• Metafile level– Access to:• File name• URL• Metafile version• Metafile Description



• Picture level– Access to:• Picture name• VDC extent• Parent• List of children

– Control over:• Links between children



• Graphical primitives– Control over:• Color• Intensity• Line weight• Edge weight



• Layer application structure type– Access to:

• Identifier• Layer name• Layer description• Parent• List of children

– Control over:• Visibility• Links between children



• Grobject application structure type– Access to:

• Identifier• Name• Region• View context• Parent• List of children

– Control over:• Linkuri• Screentip• visibility



• Para and subpara application structure type– Access to:

• Identifier• Region• View context• Content• Parent• List of children

– Control over:• Linkuri• Screentip• visibility



• Application structure graphical primitives– Control over:

• Color• Intensity• Line weight• Edge weight• Text font• Text size• Text scale factor



• Event handling:– OnClick– OnMouseOver– OnMouseOut– OnLoad– OnUnload


DOM Work in Progress

Watch this space

http://www.cgmopen.org

XML Europe 2002 Barcelona, 21 - 23 May WebCGM DOM - External Control for Web Graphics Dave Cruikshank Technical Fellow, The Boeing Company CTO, CGM Open.

Documents

xml europe

background webcgm webcgm

webcgm dom requirements

webcgm dom external

gdata para gdata slide

background cgm version

dom work

ematek informatik gmbh