Re: [Mapbuilder-devel] [Mapbuilder-users] snap

[Cameron S. <cam...@gm...>]

If you want to discuss development like this, it would be better to talk 
about it on the mapbuilder-devel list.  I suggest you subscribe if you 
have not already.

I think a snap to point would be a useful addition to the editLine.

You should be developing on the trunk for this and use OWSContext 
instead of WMC (as used in release 1.0).

It will require your client to have at least 2 point layers (eg a GML 
layer), the layer to snap to, and the layer being edited.  The Points to 
snap to will need to be specified in the config.xml file.

Then in the EditLine.js code, you will need to link in snapTo 
functionality.  (or maybe in the EditButtonBase.js).

As I think about this, I'd like to create a standard interface to all 
the different point data layers.  (We have a WFS, GML, GeoRSS, and may 
later have KML and WKT).

A findNearest() function should be added to to the PointDataSource() 
model.  This will be useful in a few other places where we want to edit 
features.

I'm open to a snap to grid, but I'm not sure what use case would use a 
snap to grid.  Do you have one in mind?
And I'm not sure how you would specify the grid in the config file.  Any 
suggestions?

It would probably help to discuss some of these things in a chat 
session.  Eg the Mapbuilder team meeting.

There are some tips on upodating widgets and buttons here:
http://docs.codehaus.org/display/MAP/Tutorials

Sofronisco wrote:
> I would like to modify the editLine tool with the following features:
> 
> * snap every point inserted by the user to the nearest point availlable
> possibly first suggesting the user the nearest point while the user is
> maintaing the mouse down.
> 
> * snap to a grid (useful also for the editPoint tool).
> 
> I think it's possible doing this, doesn't it?
> Any ideas on how to proceed?
> 
> 


-- 
Cameron Shorter
http://cameron.shorter.net