W3C home > Mailing lists > Public > www-svg@w3.org > May 2001

Re: changing the level of detail depending on the level of zoom (or s cale)

From: Jon Ferraiolo <jferraio@Adobe.COM>
Date: Tue, 22 May 2001 09:31:47 -0700
Message-Id: <>
To: Adam Van Den Hoven <Adam.Hoven@bluezone.net>
Cc: "SVG Mailing List (E-mail)" <www-svg@w3.org>
I would put on 'onzoom' event attribute on the outermost SVG element and 
then use JavaScript and the DOM to set the 'display' property to 'hidden' 
or 'visible' on various groups of objects based on the zoom level. The 
check the zoom level, I would look at the 'currentScale' DOM attribute on 
the SVGSVGElement interface.

Jon Ferraiolo
SVG Editor

At 08:23 AM 5/22/01 -0700, Adam Van Den Hoven wrote:
>Good morning,
>Monday was a holiday here in Canada (whether you like the monarchy or not,
>there probably isn't a Canadian who doesn't appreciate the opportunity to
>celebrate Queen Victoria's birthday) and I spent part of it working on some
>SVG things that I don't normally get time ti work on.
>I came accross something that I'm not sure how to address, since I'm not
>sure that SVG has a declaritive mechanism for it. If I have a drawing of
>some sort (lets say a map of a community) that I've done with all sorts of
>detail. Is there any way to specify which parts of the drawing are available
>at different levels of zoom.
>Lets take my community drawing. If you are looking at the outer most level,
>then you are able to only see the outlines of the streets and lots, perhaps
>with indicators of which are sold and the price of the remaining. Then if
>you zoom into a street, you might see the lots, none of the sale
>information, the house outlines and the basic landscaping. if you zoom in
>more,  you see the layout of the sprinklers and the various beds. If you
>zoom into a house, you would get the layout of all the rooms with their
>descriptions. If you zoom futher in to a room you would get the layout of
>the furniture (or the appliances).
>The thing is that at the original view, I don't want the houses and the
>rooms muddying up the drawing.
>Now I'll grant that this may not be a realistic example simply because the
>size of the actual drawing would be enormous. Its more a matter of knowing
>how to do this sort of thing. (I'm more likely to use it in a graph or
>something more pedestrian).
>Adam van den Hoven
>Internet Software Developer
>Blue Zone
>tel. 604 685 4310 ext. 280
>fax 604 685 4391
> > Blue Zone makes you interactive. http://www.bluezone.net/
> >
> >
> >
Received on Tuesday, 22 May 2001 12:49:46 UTC

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