private static Bitmap GetSymbolizerBitmap(IPointSymbolizer symbolizer, IProj e)
{
if (symbolizer == null) return null;
var scaleSize = symbolizer.GetScale(e);
var size = symbolizer.GetSize();
if (size.Width * scaleSize < 1 || size.Height * scaleSize < 1) return null;
var bitmap = new Bitmap((int)(size.Width * scaleSize) + 1, (int)(size.Height * scaleSize) + 1);
var bg = Graphics.FromImage(bitmap);
bg.SmoothingMode = symbolizer.Smoothing ? SmoothingMode.AntiAlias : SmoothingMode.None;
var trans = bg.Transform;
// keenedge:
// added ' * scaleSize ' to fix a problme when ploted using ScaleMode=Geographic. however, it still
// appeared to be shifted up and left by 1 pixel so I also added the one pixel shift to the NW.
trans.Translate(((float)(size.Width * scaleSize) / 2 - 1), (float)(size.Height * scaleSize) / 2 - 1);
bg.Transform = trans;
symbolizer.Draw(bg, 1);
return bitmap;
}