Snapping options

[yvesm]

Edit, create and split features could all benefit from good snapping capabilities. Users often have a need to edit or create features by snapping them to other features *not necessarily in the same layer*. Some snapping support is already available in the merge/split widget. we need to enable snapping everywhere vertex manipulation is possible.

NOTE : a feature like "tracetool" in Arc* was mentioned as potentially useful. Although after some discussion, it was felt that basic snapping options with the ability to split a feature against another feature, again not necessarily in the same layer, would suffice at least for polygons. For lines it's a different story though.

[woodbri]

It looks like there currently is some support for snapping already in OpenLayers.

See specifically: ​http://dev.openlayers.org/apidocs/files/OpenLayers/Control/Snapping-js.html

and more generally: ​http://www.google.com/#hl=en&source=hp&q=openlayers+vector+snapping

[yvesm]

Thanx Stephen; see also http://geoprisma.org/samples/merge_split/index.php?testid=90 ("insert split points" and "draw split line" buttons) for an example of those OpenLayers snapping options in an Ext JS context.

[yvesm]

Will be taken care of while working on the redlining widget.