Geomap map scaling

I'm using geomap to draw a map of the USA. It works fine but i'm not sure of the exact aspect ratio to draw the map? Through trial and error I can get it almost correct but is there any way to make it exactly proportional? Something like geoMap.getWidth()?

GeoMap geoMap = new GeoMap(0, 0, 1000, 500, this); geoMap.draw();