private void DrawTile(MapArgs args, TileInfo info, Resolution resolution, byte[] buffer, TileReprojector tr = null)
{
if (buffer == null || buffer.Length == 0)
return;
tr = tr ?? new TileReprojector(args, _projection, _targetProjection);
using (var bitmap = (Bitmap)Image.FromStream(new MemoryStream(buffer)))
{
var inWorldFile = new Reprojection.WorldFile(resolution.UnitsPerPixel, 0,
0, -resolution.UnitsPerPixel,
info.Extent.MinX, info.Extent.MaxY);
Reprojection.WorldFile outWorldFile;
Bitmap outBitmap;
tr.Reproject(inWorldFile, bitmap, out outWorldFile, out outBitmap);
if (outWorldFile == null) return;
var lt = args.ProjToPixel(outWorldFile.ToGround(0, 0));
var rb = args.ProjToPixel(outWorldFile.ToGround(outBitmap.Width, outBitmap.Height));
var rect = new Rectangle(lt, Size.Subtract(new Size(rb), new Size(lt)));
args.Device.DrawImage(outBitmap, rect, 0, 0, outBitmap.Width, outBitmap.Height,
GraphicsUnit.Pixel, _imageAttributes);
if (outBitmap != bitmap) outBitmap.Dispose();
if (FrameTile)
{
if (FramePen != null)
args.Device.DrawRectangle(FramePen, rect);
}
}
}
/// <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)
{
// If this layer is not marked visible, exit
if (!IsVisible) return;
_stopwatch.Reset();
var region = regions.FirstOrDefault() ?? args.GeographicExtents;
if (!Monitor.TryEnter(_drawLock))
return;
LogManager.DefaultLogManager.LogMessage("MAP : " + region, DialogResult.OK);
// If we have a target projection, so project extent to providers extent
var geoExtent = _targetProjection == null
? region
: region.Intersection(Extent).Reproject(_targetProjection, _projectionInfo);
LogManager.DefaultLogManager.LogMessage("SOURCE: " + geoExtent, DialogResult.OK);
if (geoExtent.IsEmpty())
{
LogManager.DefaultLogManager.LogMessage("Skipping because extent is empty!", DialogResult.OK);
Monitor.Exit(_drawLock);
return;
}
BruTile.Extent extent;
try
{
extent = ToBrutileExtent(geoExtent);
}
catch (Exception ex)
{
LogManager.DefaultLogManager.Exception(ex);
Monitor.Exit(_drawLock);
return;
}
if (double.IsNaN(extent.Area))
{
LogManager.DefaultLogManager.LogMessage("Skipping because extent is empty!", DialogResult.OK);
Monitor.Exit(_drawLock);
return;
}
var pixelSize = extent.Width/args.ImageRectangle.Width;
var tileSource = _configuration.TileSource;
var schema = tileSource.Schema;
var level = _level = Utilities.GetNearestLevel(schema.Resolutions, pixelSize);
_tileFetcher.Clear();
var tiles = new List<TileInfo>(Sort(schema.GetTileInfos(extent, level), geoExtent.Center));
var waitHandles = new List<WaitHandle>();
var tilesNotImmediatelyDrawn = new List<TileInfo>();
LogManager.DefaultLogManager.LogMessage(string.Format("Trying to get #{0} tiles: ", tiles.Count),
DialogResult.OK);
// Set up Tile reprojector
var tr = new TileReprojector(args, _projectionInfo, _targetProjection);
var sw = new System.Diagnostics.Stopwatch();
sw.Start();
// Store the current transformation
var transform = args.Device.Transform;
var resolution = schema.Resolutions[level];
foreach (var info in tiles)
{
var are = _tileFetcher.AsyncMode ? null : new AutoResetEvent(false);
var imageData = _tileFetcher.GetTile(info, are);
if (imageData != null)
{
//DrawTile
DrawTile(args, info, resolution, imageData, tr);
continue;
}
if (are == null) continue;
waitHandles.Add(are);
tilesNotImmediatelyDrawn.Add(info);
}
//Wait for tiles
foreach (var handle in waitHandles)
handle.WaitOne();
//Draw the tiles that were not present at the moment requested
foreach (var tileInfo in tilesNotImmediatelyDrawn)
DrawTile(args, tileInfo, resolution, _tileFetcher.GetTile(tileInfo, null), tr);
//Restore the transform
args.Device.Transform = transform;
sw.Stop();
System.Diagnostics.Debug.WriteLine("{0} ms", sw.ElapsedMilliseconds);
System.Diagnostics.Debug.Write(string.Format("Trying to render #{0} tiles: ", tiles.Count));
LogManager.DefaultLogManager.LogMessage(string.Format("{0} ms", sw.ElapsedMilliseconds), DialogResult.OK);
//if (InvalidRegion != null)
// Invalidate();
//_stopwatch.Restart();
Monitor.Exit(_drawLock);
}
