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In my app I added a mapquest layer with open layers 3, drawed points and lines...

Now i need to know the pixel coordinates from a long/lat point in the map (visible area) using

map.getPixelFromCoordinate(coordinate).
this function always returns null (testing):
center = map.getView().getCenter();
px = map.getPixelFromCoordinate(center);
alert(JSON.stringify(px));
What i'm doing wrong or what i didn't understand properly?
  
I'd be careful with this. You might get wrong results, e.g. when the map does not have the final layout yet. It is better to wait with the first coordinate to pixel conversion until the map is rendered. You do not need a timeout for this, we have the 'postrender' event on ol.Map. So in your initialisation code, you could do something like this:
map.once('postrender', function() {
  // safe to call map.getPixelFromCoordinate from now on
Source: github.com/openlayers/ol3/issues/5456
I hope this helps.
        
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