getClosestFeatureToCoordinate does not work for Points - openlayers-3

Question

I made a function to get the closer feature to the one clicked. I use Openlayers 3.9.0 and the getClosestFeatureToCoordinate method.
var select = new ol.interaction.Select();//simple click interaction
map.addInteraction(select);//add it to the map
select.on('select', function(e) {
//get the extent of the first selected feature
var aa = e.selected[0].getGeometry().getExtent();
//in case of line or polygon get the center of that extent
var oo = ol.extent.getCenter(aa);
//use it to get the name of the closest feature
console.log((sourceVector.getClosestFeatureToCoordinate(oo)).get("mylayer_name")) ;
});
But in a case like the following
if I click the "u" Polygon (bottom down) I get "u" instead of , say, "e"
if I click any point I get its name , instead of the closest feature's name. I click "testpoint9" and I get "testpoint9" instead of "u" or "e". I click "h" and I get "h" instead of "p" or "k".
So maybe has to do with points, so I changed the select.on event function to
select.on('select', function(e) {
var closestType = e.selected[0].getGeometry().getType();
var oo;
if (closestType === 'Point'){
oo = e.selected[0].getGeometry().getCoordinates();
}
else{
var aa = e.selected[0].getGeometry().getExtent();
oo = ol.extent.getCenter(aa);
}
console.log("---------------------------------------------------");
console.log("Name: "+sourceVector.getClosestFeatureToCoordinate(oo).get('mylayer_name'));
})
and still nothing. So, how I fix this?
Thanks

Answer 1

When You click inside the "u" polygon - the distance to it is 0.
When you click on something - that thing will always be the closest (to itself).
What you can do there, is removing the clicked element from the layer, run the algorithm (without clicked point) and put the point back on the layer.
If You are afraid that point could be invisible for too long (but it shouldn't), place it in another layer for the time of algorithm.
select.on('select', function(e) {
var clicked = e.selected[0];
sourceVector.removeFeature(clicked);
var closest = sourceVector.getClosestFeatureToCoordinate(e.coordinate);
sourceVector.addFeature(clicked);
var closestType = closest.getType();
if (closestType === 'Point'){
oo = e.selected[0].getGeometry().getCoordinates();
}
else{
var aa = e.selected[0].getGeometry().getExtent();
oo = ol.extent.getCenter(aa);
}
})