internal void FullExtent()
{
if (myMap.LayerNum != 0)
{
MyRectangle mbr = myMap.GetMBR();
centerLngLat = new PointF(((float)mbr.MaxX + (float)mbr.MinX) * 0.5F, ((float)mbr.MaxY + (float)mbr.MinY) * 0.5F);
double x = ETCProjection.Longitude2X(mbr.MaxX) - ETCProjection.Longitude2X(mbr.MinX);
double y = ETCProjection.Latitude2Y(mbr.MaxY) - ETCProjection.Latitude2Y(mbr.MinY);
double scale1 = x / Width;
double scale2 = y / Height;
Ratio = Math.Max(scale1, scale2);
scaleIndex = maxZoomLevel;
UpdateMapImg();
}
}