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Hi Roger,
I am sure there are better people out there to
answer this question-- but I will take a stab:
>>1.
Suppose that I render an SVG document in a browser (using the Adobe SVG
plugin). My experiments show that I can right-mouse-click on the
image and select Zoom in. However, my experiments also show that I
can only Zoom in 3 or 4 times, at which time the Zoom in menu pick gets
grayed-out. Does SVG limit the level of Zooming in, or is that a
limitation of the Adobe renderer?<<
This is an
implementation specific detail.
>>2. Continuing with the last question ...
Suppose that I have a map of a country. How much detail can be put into
the map? Can I put details down to the level of a building, on a street,
in a city, in a state in the country? Can I then Zoom in from the country
level down to see the building?<<
Theorectically, yes.
Though I suspect this would be extremely unlikely. Imagine diagraming every
building in the country in a single image. This would be immense-- and I doubt
there is a renderer that could handle it-- and unlikely any computer to hold the
diagram in memory. To do it you would probably want to work from a generated SVG
that pulled items out of a database for each level (ultimately a new SVG for
each area). But it is "possible"-- especially because SVG allows you to maintain
your own coordinate spaces-- so when you zoom you are not zooming in on pixels
but regions.
>>3. Can I associate textual information with parts of
the SVG graphic? For example, if I have a graphic of a country, I might
like to associate some textual information for each city. Is it possible
to hide the textual information until the user, for example, right-mouse-clicks
on the city?<<
Yes, but right
clicking is perhaps a bad method because working with a context menu is
implementation specific. A click or a key could very easily allow you to "popup"
an informational window or context help. This can be done through javascript or
smil.
>>4. Continuing with the last question ... Can I
associate different textual information with different scales? For
example, when the graphic of the whole country is being displayed I want to
display text relating to the whole country. When the user zooms down to a
city, I want text relating to that city. Thus, is it possible to associate
different text with different zoom levels and different parts of the
graphic?<<
Yes. Lance Dyas
posted this sample to the svg-dev list on Friday. It shows some of what you are
asking-- though the example was intended for a different
purpose.
http://www.dyasdesigns.com/svg/mtsthelens.svg
Given time, I could
probably come up with some more examples showing almost exactly what you are
describing.
>>5. Suppose that I want to create an SVG image of a
country. I cannot imagine handcrafting an XML SVG document. How do
you suggest that I create the SVG document?<<
There are a number
of tools that work from images to generate path statements for SVG. Adobe
Illustrator is a good example-- anything done there can be saved to SVG.
Additionally, there are some great pure SVG tools out there such as XStudio (http://www.evolgrafix.com). I believe there
are some opensource converters out there, but don't know them off
hand.
Hope this
helps,
Jeff
Rafter
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