Addressed to: Floyd Baker <[EMAIL PROTECTED]>
[EMAIL PROTECTED]
** Reply to note from Floyd Baker <[EMAIL PROTECTED]> Thu, 01 Mar 2001 16:39:23 -0500
>
>
>
> Hi.. We have a city map using co-ordinates to link to specific info on various
> buildings, etc. The links bring up an information page with data and photos for
> each building locations on the map.
>
> My question is, when this information page is accessed from another direction,
> say a menu, can there be a link that operates in 'reverse', back to the map and
> the building in question? We still want people to see the map, relating to a
> specific building, whether they start there or end up there.
>
> I thought the map could perhaps position itself so that the point of interest is
> always in the center, or that it blinks, or has a arrow pointing to it. It
> doesn't matter what the final display looks like, just that is shows a
> particular location clearly.
If you have a small number of locations <100 or so, and you only want to
show one at a time, I'd seriously consider just making 100 maps with
markers on them, and sending the right one when needed. This will be
much faster to serve as there is no graphic processing involved.
If you want to be able to have multiple random selections where more
than one location is shown on a map, you are stuck generating them on
the fiy. I would start with a stock map and use GD to draw a marker
over the top of it for each location you want to hilite. In each of
your database records you would record the x and y coordinates of the
point on the map where the building is located.
If you want to build maps with various center points and scales, and be
able to plot buildings on it, you will want to store the lat and lon of
the building, and store everything else using lat/lon. If you are going
to do this, look for someone very good with geometry to design the math.
It can get tricky trying to show a section of a sphere on a flat
screen.
Rick Widmer
Internet Marketing Specialists
http://www.developersdesk.com
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