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Compiling SVG: How and Why. Michael Levy , Quetzalcoatl Bradle y and Calin Somosan NewHeights Software Corporation. The Natural History of UI-1. The Natural History of UI-2. The Natural History of UI - 3. The Natural History of UI - 4. Convergence. Human Interface Guidelines

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compiling svg how and why

Compiling SVG: How and Why

Michael Levy, Quetzalcoatl Bradley and Calin Somosan

NewHeights Software Corporation

convergence
Convergence
  • Human Interface Guidelines
    • Are metaphors still appropriate?
    • Do they reflect converged offerings?
    • Can they project a brand?
  • Mitel Design Center
    • Unify the device (phone on desk) and application
    • Input vehicle should be irrelevant to user
what about web applications
What about Web Applications?
  • Interim technology
    • Many advantages, but
    • Step backwards in responsiveness
      • Human perception is continuous, not discreet
      • Transaction based processing is as bad as Menu driven DOS-like processing
the role of the architect
The Role of the Architect
  • GUI Libraries
    • Simplify programming
    • Enforce “look-and-feel”
    • Biased towards Shell designers metaphor
    • Too complex for industrial designer
  • Today’s design tools
    • Illustrator, Flash
helixrad
HelixRAD
  • Graphical element has 4 major parts
    • Template
      • VML/DHTML/CSS
    • Parameters
    • Elements
      • Attribute invariants for each element
    • Semantics
      • Handlers for actions (Javascript)
why use svg
Why use SVG?
  • Elegance/ power of descriptive language
  • Tools support
    • Xml compliant
    • Graphics editors
why compile
Why Compile?
  • Interpreted code is not, and never will be, good enough to compete with compiled code
  • Example - menu as SVG:
    • Load the XML
    • Create the DOM
    • Change the text attribute for the Menu name
    • Clone an item node for each menu item
    • Set the text attribute of each item
    • Traverse the resulting DOM tree, rendering it.
how to compile svg
How to Compile SVG
  • On Win32, GDI+ library provides most of what is needed
  • Provide an abstract library for general elements
  • Compiler subclasses or instantiates particular SVG files
  • Scheme needed to automate attachment of semantic actions
conclusions and future work
Conclusions and Future Work
  • Mismatches between GDI+ and Adobe reference implementation are problematic
  • Better SVG tool support:
    • Grouping
    • Most meaningful element that fits
      • EG: Square instead of four paths; circle instead of (closed) arc
  • SVG lacks adequate alternative to DOM clone for class instantiation
  • Standards for semantics?
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