Get Paddinged Bounds for MapGoogle Maps API

google_maps_api-padding_bounds.js

if (google && google.maps && !google.maps.Map.prototype.getPadBounds) {
    google.maps.Map.prototype.getPadBounds = function (top, right, bottom, left) {
        top = (('' + top).match(/^[0-9]+$/i) ? parseInt(top) : 0);
        right = (('' + right).match(/^[0-9]+$/i) ? parseInt(right) : 0);
        bottom = (('' + bottom).match(/^[0-9]+$/i) ? parseInt(bottom) : 0);
        left = (('' + left).match(/^[0-9]+$/i) ? parseInt(left) : 0);

        var bounds = this.getBounds();
        var scale = Math.pow(2, this.getZoom());
        var proj = this.getProjection();

        var sw = proj.fromLatLngToPoint(bounds.getSouthWest());
        var ne = proj.fromLatLngToPoint(bounds.getNorthEast());
        sw = new google.maps.Point(
            ((sw.x * scale) + left) / scale,
            ((sw.y * scale) - bottom) / scale
        );
        ne = new google.maps.Point(
            ((ne.x * scale) - right) / scale,
            ((ne.y * scale) + top) / scale
        );
        var rect = new google.maps.LatLngBounds(proj.fromPointToLatLng(sw), proj.fromPointToLatLng(ne));

        // // Debug: show rectangle
        // new google.maps.Rectangle({
        //     bounds: rect,
        //     map: this
        // });

        return rect;
    };
}