public HttpResponseMessage GetTile(string layerId, string accessId, int z, int x, int y)
{
// Create the LayerOverlay for displaying the map.
LayerOverlay layerOverlay;
// The FilterStyle overlay is not stored in CachedOverlay.
if (layerId == "FilterStyle")
{
layerOverlay = GetFilterStyleOverlay(accessId);
}
else
{
layerOverlay = cachedOverlays[layerId];
}
// Draw the map and return the image back to client in an HttpResponseMessage.
using (Bitmap bitmap = new Bitmap(256, 256))
{
PlatformGeoCanvas geoCanvas = new PlatformGeoCanvas();
RectangleShape boundingBox = WebApiExtentHelper.GetBoundingBoxForXyz(x, y, z, GeographyUnit.Meter);
geoCanvas.BeginDrawing(bitmap, boundingBox, GeographyUnit.Meter);
layerOverlay.Draw(geoCanvas);
geoCanvas.EndDrawing();
MemoryStream memoryStream = new MemoryStream();
bitmap.Save(memoryStream, ImageFormat.Png);
HttpResponseMessage responseMessage = new HttpResponseMessage(HttpStatusCode.OK);
responseMessage.Content = new ByteArrayContent(memoryStream.ToArray());
responseMessage.Content.Headers.ContentType = new MediaTypeHeaderValue("image/png");
return(responseMessage);
}
}
private HttpResponseMessage DrawTileImage(LayerOverlay layerOverlay, int z, int x, int y)
{
using (Bitmap bitmap = new Bitmap(256, 256))
{
PlatformGeoCanvas geoCanvas = new PlatformGeoCanvas();
RectangleShape boundingBox = WebApiExtentHelper.GetBoundingBoxForXyz(x, y, z, GeographyUnit.Meter);
geoCanvas.BeginDrawing(bitmap, boundingBox, GeographyUnit.Meter);
layerOverlay.Draw(geoCanvas);
geoCanvas.EndDrawing();
MemoryStream ms = new MemoryStream();
bitmap.Save(ms, ImageFormat.Png);
HttpResponseMessage msg = new HttpResponseMessage(HttpStatusCode.OK);
msg.Content = new ByteArrayContent(ms.ToArray());
msg.Content.Headers.ContentType = new MediaTypeHeaderValue("image/png");
return(msg);
}
}