/*
* private static Extent FromBruTileExtent(BruTile.Extent extent)
* {
* return new Extent(extent.MinX, extent.MinY, extent.MaxX, extent.MaxY);
* }
*/
/// <summary>
/// This draws content from the specified geographic regions onto the specified graphics
/// object specified by MapArgs.
/// </summary>
public void DrawRegions(MapArgs args, List <Extent> regions)
{
BruTile.Extent extent = ToBrutileExtent(args.GeographicExtents);
double pixelSize = extent.Width / args.ImageRectangle.Width;
int level = Utilities.GetNearestLevel(TileSource.Schema.Resolutions, pixelSize);
IList <TileInfo> tiles = TileSource.Schema.GetTilesInView(extent, level);
IList <WaitHandle> waitHandles = new List <WaitHandle>();
foreach (TileInfo info in tiles)
{
if (TileCache.Find(info.Index) != null)
{
continue;
}
AutoResetEvent waitHandle = new AutoResetEvent(false);
waitHandles.Add(waitHandle);
ThreadPool.QueueUserWorkItem(GetTileOnThread,
new object[] { TileSource.Provider, info, TileCache, waitHandle });
}
foreach (WaitHandle handle in waitHandles)
{
handle.WaitOne();
}
foreach (TileInfo info in tiles)
{
using (Image bitmap = Image.FromStream(new MemoryStream(TileCache.Find(info.Index))))
{
PointF min = args.ProjToPixel(new Coordinate(info.Extent.MinX, info.Extent.MinY));
PointF max = args.ProjToPixel(new Coordinate(info.Extent.MaxX, info.Extent.MaxY));
min = new PointF((float)Math.Round(min.X), (float)Math.Round(min.Y));
max = new PointF((float)Math.Round(max.X), (float)Math.Round(max.Y));
args.Device.DrawImage(bitmap,
new Rectangle((int)min.X, (int)max.Y, (int)(max.X - min.X), (int)(min.Y - max.Y)),
0, 0, TileSource.Schema.Width, TileSource.Schema.Height,
GraphicsUnit.Pixel);
}
}
}
private static Extent FromBruTileExtent(BruTile.Extent extent)
{
return(new Extent(extent.MinX, extent.MinY, extent.MaxX, extent.MaxY));
}
