[ka-Map-users] Drawing lines dynamically on top of kaMap

ramesh karra karrarm at yahoo.com
Fri Sep 15 16:29:19 EDT 2006

Thank you very much for the quick response stephen! I
will look into the archives.

I have a quick question -

What is the most efficient way to do this if the
number of points is small (say < 30).


--- Stephen Woodbridge <woodbri at swoodbridge.com>

> ramesh karra wrote:
> > Hi,
> > 
> > Currently, I can successfully display a map
> generated
> > from a map file using mapserver and kaMap. 
> > 
> > I would like to know what is the best way to draw
> a
> > dynamic line(or route) as a layer on top of this
> map
> > given that the data I have is a sequence of points
> > represented by lattitude and longitude (and not in
> > some shape file or postgres db)
> Ramesh,
> There has been a lot of discussion on this, you
> might want to search the 
> archives. To summarize, there is no good way to do
> this on the client 
> yet. You can do it for a few line segments, but
> performance rapidly 
> degrades to unacceptable as you start pushing over
> about 50 points.
> I think what a lot of people, well those that have
> actually implemented 
> something are doing it server side. The scenario is
> as follows:
> 1) put your points into a session storage
> 2) modify the client to request a route image on
> viewport extents change
> 3) have a php, or cgi script read the session data
> and the viewport 
> extents and scale and generate an image that is
> returned to the client
> 4) have the client pin the image to the viewport.
> This is basically the way that google is doing it.
> You can get a little 
> bit smarter on the client to not make requests when
> the view port 
> extents change if you don't need to redraw the
> image.
> -Steve W.

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