/// <summary>
/// Create an image for this layer by stitching together tile images.
/// </summary>
/// <param name="oLayerBoundingBox">
/// The bounding box for the layer. Tiles outside this bounding box will not be drawn.
/// </param>
/// <param name="oViewBoundingBox">
/// The bounding box of the view. The resulting image will be scaled and
/// cropped to fill this view.
/// </param>
/// <returns>The raw data of the composed image.</returns>
public byte[] GetCompositeImage(BoundingBox oLayerBoundingBox, BoundingBox oViewBoundingBox)
{
if (!oLayerBoundingBox.Intersects(oViewBoundingBox))
return BlankImageBytes();
BoundingBox visibleDataBounds = oLayerBoundingBox.IntersectWith(oViewBoundingBox);
//bool moreDataComing = false;
TileSet oRequiredTiles = new TileSet(visibleDataBounds, TileSet.GetLevel(oViewBoundingBox));
TileSet oServiceTiles = oRequiredTiles;
// --- Keep going to lower-levelled tiles until we can service the request ---
System.Diagnostics.Debug.WriteLine("Requesting composite image at level " + oServiceTiles.Level);
while (oServiceTiles.Level > 0 && !oServiceTiles.IsCached(this, oLayerBoundingBox))
{
oRequiredTiles = oServiceTiles;
oServiceTiles = new TileSet(visibleDataBounds, oServiceTiles.Level - 1);
//moreDataComing = true;
System.Diagnostics.Debug.WriteLine("Decrementing level to " + oServiceTiles.Level);
}
// --- Queue up the other images for the request ---
if (!oRequiredTiles.IsCached(this, oLayerBoundingBox))
{
DownloadSet oRequiredDownloads = new DownloadSet(this, oRequiredTiles, oLayerBoundingBox);
oRequiredDownloads.DownloadAsync(new EventHandler(oRequiredDownloads_DownloadComplete));
}
// --- Compose image tiles to master tile ---
Bitmap composite = ComposeImageFromTileCache(oServiceTiles);
BoundingBox compositeBounds = oServiceTiles.Bounds;
double degreesPerPixel = TileInfo.GetTileSize(oServiceTiles.Level) / TileInfo.TileSizePixels;
// --- Render the image for the tile level requested ---
Bitmap result = new Bitmap((int)((oViewBoundingBox.MaxX - oViewBoundingBox.MinX) / degreesPerPixel), (int)((oViewBoundingBox.MaxY - oViewBoundingBox.MinY) / degreesPerPixel));
BoundingBox resultBounds = new BoundingBox(oViewBoundingBox);
using (Graphics g = Graphics.FromImage(result))
{
g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
g.DrawImage(composite, new PointF((float)((compositeBounds.MinX - resultBounds.MinX) / degreesPerPixel), (float)((resultBounds.MaxY - compositeBounds.MaxY) / degreesPerPixel)));
//if (moreDataComing)
// g.FillRectangle(new System.Drawing.Drawing2D.HatchBrush(System.Drawing.Drawing2D.HatchStyle.Percent05, Color.Green, Color.Transparent), 0, 0, result.Width, result.Height);
}
result.Save("C:/documents and settings/chrismac/desktop/sent.png", System.Drawing.Imaging.ImageFormat.Png);
MemoryStream buffer = new MemoryStream();
result.Save(buffer, System.Drawing.Imaging.ImageFormat.Png);
return buffer.ToArray();
}
