Google Maps calculate visible part of the map - google-maps

Question

Ok, i good a simple question about Google Maps.
Imagine there is a map the user scrolls half way out of screen on desktop. So only half of the map is visible on screen.
How can i calculate which part is visible, so i can put a marker in the center of the visible part of the map?
So if you check this out:
http://jsfiddle.net/Honkoman/ghzgdLhw/
and scale the browser window like this:
You see that pressing "run" sets the marker not in the visible middle of the map.
That's because map.getCenter works with the canvas dimensions, not the visible part of the map. So how can this be done?
var marker = new google.maps.Marker({
position: map.getCenter(),
map: map
});

Answer 1

You can use
map.getBounds()
Returns the lat/lng bounds of the current viewport. If more than one
copy of the world is visible, the bounds range in longitude from -180
to 180 degrees inclusive.
for obtain the coord of the visible maps
or directly you can use getCenter
map.getCenter();
and for marker
var marker = new google.maps.Marker({
position: map.getCenter(),
map: map,
title: 'Hello World!'
});
}
for the bound you can use this tecnique
aNord = map.getBounds().getNorthEast().lat();
aEst = map.getBounds().getNorthEast().lng();
aSud = map.getBounds().getSouthWest().lat();
aOvest = map.getBounds().getSouthWest().lng();