[mapserver-users] Java Applet Development

[Daniel Morissette]

Kieran,

The ROSA applet can do exactly that... see section "4 - distance
measurement tool" in the ROSA docs at
http://www2.dmsolutions.ca/webtools/rosa/rosa_params.html

You can see an example of it in use in Environment Canada's species at
risk application at
http://www.sis.ec.gc.ca/msapps/ec_species/htdocs/ec_species_e.phtml

The measured distance is displayed in the status bar of the browser
window... no need to say that the distance is only approximative due to
the projection issues that you mentioned.

Best Regards,

Daniel


"Kieran J. Ames" wrote:
> 
> Are there any users/developers who have played with a Java interface to
> MapServer data, other than the wonderful mapimage applet?
> I'm thinking of a measuring tool that could be used to make a
> rudimentary ruler, where a user could click from
> point-to-point-to-point, drawing a line and getting an indication of the
> length of the line that was drawn.
> The maps I render are typically only in the "town/neighborhood" range,
> and I can't speak to great-circles, projections vs decimal degrees, etc.
> But I would think that a map that has a given extent would have some
> sort of distance per pixel value that could be calculated and applied to
> a line drawing tool. Specifically, I'd like to be able to offer the user
> the ability to get an Ad-Hoc distance estimate when viewing a
> neighborhood by "tracing" a line over the streets they're viewing and
> figure out how many linear feet (meters/yards) were traveled: as opposed
> to "as the crow flies" straight line distances.
> Any Java-wise users out there that have explored this kind of
> functionality?
> Thanks,
> Kieran