Add Padding To Google Maps Bounds.contains()

I have a sidebar which shows the names of the markers in the current map view of a google map. The sidebar contents change as the map gets moved: google.maps.event.addListener(map,

Solution 1:

In case anybody finds this later, I ended up recalculating the bounds - it seemed to be the approach that involved the least overhead. Here's the function:

function paddedBounds(npad, spad, epad, wpad) {
    var SW = map.getBounds().getSouthWest();
    var NE = map.getBounds().getNorthEast();
    var topRight = map.getProjection().fromLatLngToPoint(NE);
    var bottomLeft = map.getProjection().fromLatLngToPoint(SW);
    var scale = Math.pow(2, map.getZoom());

    var SWtopoint = map.getProjection().fromLatLngToPoint(SW);
    var SWpoint = new google.maps.Point(((SWtopoint.x - bottomLeft.x) * scale) + wpad, ((SWtopoint.y - topRight.y) * scale) - spad);
    var SWworld = new google.maps.Point(SWpoint.x / scale + bottomLeft.x, SWpoint.y / scale + topRight.y);
    var pt1 = map.getProjection().fromPointToLatLng(SWworld);

    var NEtopoint = map.getProjection().fromLatLngToPoint(NE);
    var NEpoint = new google.maps.Point(((NEtopoint.x - bottomLeft.x) * scale) - epad, ((NEtopoint.y - topRight.y) * scale) + npad);
    var NEworld = new google.maps.Point(NEpoint.x / scale + bottomLeft.x, NEpoint.y / scale + topRight.y);
    var pt2 = map.getProjection().fromPointToLatLng(NEworld);

    returnnew google.maps.LatLngBounds(pt1, pt2);
}

and you call it like this:

var padbnds = paddedBounds(50, 70, 100, 30);

specifying how much padding you want on the north, south, east and west edges of the map respectively