Overview of CGM CGM is a binary vector graphics format.

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Presentation transcript:

Overview of CGM CGM is a binary vector graphics format. Primarily used in technical graphics Most are generated from CAD source Allows for embedded images ISO/IEC 8632:1999 Standard WebCGM profile is a W3C recommendation © 2004 Docsoft Inc. All Rights Reserved

Reasons for Conversion Interoperability XML based graphics Functionality Dynamic capabilities Reusability SVG Fragments Isolate changes © 2004 Docsoft Inc. All Rights Reserved

File Size Using the ATA/NIST test suites CGM SVG SVGZ 6.38mb 30.1mb Files were all converted using Quick.SVG. There were just under 300 files in the suite. CGM SVG SVGZ 6.38mb 30.1mb 4.4mb © 2004 Docsoft Inc. All Rights Reserved

Issues SVG does not support bounding box for <text/> or <tspan/> elements Restricted Text We can not use the textLength attribute because it is not well supported by viewers. The solution is to apply SVG transformation to text element to yield appropriate size. <g transform="scale(1.8 1)"> <text x=“0” y=“0”>Restricted Text</text> </g> © 2004 Docsoft Inc. All Rights Reserved

Issues CGM coordinate system can be inverted X axis, Y axis, or both. SVG It is best to detect inversions in CGM and translate all coordinates to place the origin at the top left of the screen. Since you will be touching all coordinates you can take this opportunity to apply any operations such as scaling to the CGM data. © 2004 Docsoft Inc. All Rights Reserved

Issues Splines CGM supports non-uniform b-splines The curve could of course be constructed from polylines at varying precisions with very low resource usage. The better solution is to approximate bezier curves to the spline. This can be done with near zero loss and moderate resource usage. © 2004 Docsoft Inc. All Rights Reserved

Issues Figures SVG has no simple translation from the CGM figure element CGM <Figure> <Graphical-Element/> <Edge Visibility=“True”/> <Graphical-Element /> <New-Region/> <Figure/> CGM SVG translating the figure directly with path element SVG translating the figure directly with path element © 2004 Docsoft Inc. All Rights Reserved

Other Issues Emulating multi-link in SVG Engineering line types © 2004 Docsoft Inc. All Rights Reserved