Hi,
> 1. Can an SVG app be coded so that the map file (.svg or a 'wrapper'
> file that contains an SVG file + meta data 'header', etc) contains
> layers that can be turned on and off within the program, using SVG's
> visibility? An example would be allowing a viewer to turn off grid
> lines, for instance, or turn off the foliage+terrain shading and turn on
> terrain lines only (no fills) using menu options. The SVG file would
> contain this layer information, so that each map would be self-contained.
I think you can simulate layer in SVG by using <g> element and use
visibility on/off
> 2. One of the ideas I have for one of these layers is a gray-scale
> height map that the application uses as a terrain map during
> calculations of Line-Of-Sight checks. One of the issues I will have to
> tackle is having a 'reference' somehow embedded into the map file that
> gives the app a height in meters for a particular shade of gray. I was
> considering having the map file consist of the svg itself, in addition
> to other metadata, such as this height reference, author/date
> information and authenticity/"Certified" status/CRC signature of some sort.
> The question here is, given that SVG is XML, can these 'metadata
> elements' be contained inside the SVG element tree itself without
> confusing the Batik rendering sections of the code? It is possible, I
> think, using CDATA elements, but what are the thoughts of everyone out
> there?
I am not really sure about this one, I think SVG support Metadata out of
the box. Beside for SVG 1.2 there is really interesting stuff such as
xbl, etc. Check out the SVG 1.2 spec for more info
> 3. This one is a long-shot, and I am relatively sure the answer is
> 'no', but the designer in me begs to ask: Can an app/viewer/loader be
> built that reads in a large svg file (say, a 100km x 100km map file),
> allows the user to find a smaller section of a map to use for a scenario
> (say a 20km by 20km square of that), and 'crop' the map data into a
> smaller memory footprint svg? A sort of sub-svg file?
About the memory footprint, I think it is depend on the UA itself,
but for pure SVG, I think you could use viewbox. I forget then name (if
I am not wrong), svg have attribute that can give hint to UA not to draw
the thing not currently displayed. Maybe this can save some memory.
Regards
Tonny Kohar
--
Sketsa
SVG Graphics Editor
http://www.kiyut.com
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