[OpenLayers-Users] How is feature select detection implemented?

[bkausbk]

Dear OpenLayers Users and Developers,

I'm currently studying implementation of OpenLayers components with the aim to 
extend it by a specific function. (More later)

I took /examples/select-feature.html for example. If you draw polygons there and 
move the mouse over the window each time the mouse is hovering over a polygon 
the mouse pointer changes to "hand pointer" and resets to default pointer as 
soon as I'm leaving polygon area. But I didn't find any code which is 
responsible for this.

In my understanding we need to implement a kind of "hittest" which is able to 
detect if a given point is within polygon area. This must be called somewhere in 
  OnMouseOver Handler. The only thing I found was OpenLayer.Geometry.atPoint, 
but since it is calling OpenLayers.Bounds.containsLonLat whereby 
OpenLayer.Bounds only represents rectangular areas this method couldn't be 
responsible for this.

How and where is it implemented?

What I want to do is extending OpenLayers by a function to detect:

1. If there are Geometry objects which are intersecting each other
2. Which of the polygons are intersecting (overlaping) each other
3. Find intersection points of specified polygons


regards

Benjamin Kalytta