[Mapserver-users] Help with simple(?) app

[Vinko Vrsalovic]

On Fri, Aug 08, 2003 at 09:47:49AM -0700, Hobbes Zatow wrote:
> I need to create a simple application that displays a
> map of the US, then allows the user to click on a
> state to get a zoomed-in view of just the one state
> (without seeing bordering states).  
> 
> I am able to display the US map with mapserver/cgi
> without a problem, but how do I:
> 
> 1. Display the zoomed-in state w/o bordering states?
> 
> 2. Program the "direct to state" zoom in capability?

I don't know if with plain CGI mapserver you can do it, but with
MapScript it can be done rather easily.

For 1, you could set up two classes, one to show the state, and other to
hide all the other states (by setting its status to MS_OFF), and using
class expression to choose which state is the one you want rendered.

For 2, you grab the polygon defining the state, and then obtain its
extent iterating through the points, or just do an array/hash/whatever 
for all the extents.


-- 
Vinko Vrsalovic <el[|- at -|]vinko.cl>
http://www.cprsig.cl