GMap.NET.WindowsMobile/GMap.NET.WindowsForms/Markers/GMapMarkerTransparent.cs

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namespace GMap.NET.WindowsForms.Markers
{
   using System;
   using System.Drawing;
   using System.Drawing.Imaging;
   using System.IO;
   using System.Runtime.InteropServices;

   public abstract class GMapMarkerTransparent : GMapMarker
   {
      protected GMapMarkerTransparent(PointLatLng pos)
         : base(pos)
      {
      }

      public override void OnRender(Graphics g)
      {
         for(Int32 i = 0; i < this.BitmapCount; i++)
         {
            IGMapTransparentBitmap bitmap = GetBitmap(i);
            if(bitmap == null)
            {
               continue;
            }

            System.Drawing.Rectangle src = new System.Drawing.Rectangle(0, 0, bitmap.Width, bitmap.Height);
            System.Drawing.Rectangle dst = new System.Drawing.Rectangle(LocalPosition.X + bitmap.DrawOffset.X, LocalPosition.Y + bitmap.DrawOffset.Y, bitmap.Width, bitmap.Height);
            bitmap.Draw(g, dst, src);
         }
      }

      #region Abstract Members

      protected abstract Int32 BitmapCount
      {
         get;
      }
      protected abstract IGMapTransparentBitmap GetBitmap(Int32 index);

      #endregion

      #region Load Bitmap

      public static IGMapTransparentBitmap LoadTransparentBitmap(Stream stream)
      {
         return LoadTransparentBitmap(stream, true);
      }

      public static IGMapTransparentBitmap LoadTransparentBitmap(Stream stream, Boolean hasAlpha)
      {
         try
         {
            if(hasAlpha && Environment.OSVersion.Platform == PlatformID.WinCE)
               return new WinCEImagingBitmap(stream);
            return new StandardBitmap(stream);
         }
         catch(Exception)
         {
            return null;