> I'm mainly dealing with polylines, but if that is the only way, then
> so be it. How can I perform buffer calculations?
>
Buffering every line in your display to see if selected is very
intensive. If you are struggling with accurate selection of lines, can I
suggest an alternative approach? If you use a highlight only hoverselect
control as well as a select control, then you can move mouse till target
is highlighted, then click to select.
Code like:
HoverSelectControl = new
OpenLayers.Control.SelectFeature(myLayers,{hover:true, highlightOnly:
true, renderIntent: "temporary" });
SelectControl = new
OpenLayers.Control.SelectFeature(myLayers,{clickout: true});
SelectControl.events.on({
"featurehighlighted": onFeatureSelect,
"featureunhighlighted": onFeatureUnselect
});
map.addControl(HoverSelectControl);
map.addControl(SelectControl);
HoverSelectControl.activate();
SelectControl.activate();
The order you add controls is important - hover first. I find that this
feels quite natural.
If the layers cans handle wfs, you might be better to create a
wfsprotocol object and do a spatial intersects
query, passing a rectangle around the click point and then processing
the return.
--
Phil Scadden, Senior Scientist GNS Science Ltd 764 Cumberland St,
Private Bag 1930, Dunedin, New Zealand Ph +64 3 4799663, fax +64 3 477 5232
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