//x, y and zoom to get the tile, the edge belongs to
//hOffset: horizontal offset from the generated maps center to the edge
//vOffset: vertical offset from the generated maps center to the edge
private double[] getTilesEdge(int x, int y, int zoom, int hOffset, int vOffset) {
        double[] result = new double[2];
        double lngCenter = x/Math.pow(2,zoom)*360.0-180.0; //langitude of the center of the edge tile
        double latCenter = Math.toDegrees(Math.atan(Math.sinh(Math.PI-2*y/Math.pow(2,zoom)))); //latitude of the center of the edge tile
        int xPos = 128+(-1)*hOffset;
        int yPos = 128+(-1)*vOffset;
        result [0] = //to do: latitude of the edge
        result [1] = //to do: langitude of the edge
        return result;
}