private void ProcessRequestCore(HttpContext context)
{
DateTime dts = DateTime.Now;
if (context.Request.Params["getshape"] != null)
{
ProcessGetShapeRequest(context);
return;
}
int w = 256 * 3;
int h = 256 * 3;
int tileX = 0, tileY = 0, zoomLevel = 0;
PointD centerPoint = PointD.Empty;
double zoom = -1;
int renderSettingsType = 0;
int.TryParse(context.Request["rendertype"], out renderSettingsType);
bool foundCompulsoryParameters = false;
if (int.TryParse(context.Request["tx"], out tileX))
{
if (int.TryParse(context.Request["ty"], out tileY))
{
if (int.TryParse(context.Request["zoom"], out zoomLevel))
{
centerPoint = TileUtil.GetMercatorCenterPointFromTile(tileX, tileY, zoomLevel);
zoom = TileUtil.ZoomLevelToScale(zoomLevel);
foundCompulsoryParameters = true;
}
}
}
if (!foundCompulsoryParameters)
{
throw new InvalidOperationException("compulsory parameters 'tx','ty' or 'zoom' missing");
}
string cachePath = "";
bool useCache = CacheOnServer;
if (useCache)
{
cachePath = CreateCachePath(context, tileX, tileY, zoomLevel);
}
if (string.IsNullOrEmpty(cachePath))
{
useCache = false;
}
context.Response.ContentType = "image/x-png";
//is the image cached on the server?
if (useCache && System.IO.File.Exists(cachePath))
{
context.Response.Cache.SetCacheability(HttpCacheability.Public);
context.Response.Cache.SetExpires(DateTime.Now.AddDays(7));
context.Response.WriteFile(cachePath);
context.Response.Flush();
return;
}
//render the tile
List <ShapeFile> mapLayers = CreateMapLayers(context);
if (mapLayers == null)
{
throw new InvalidOperationException("No Map Layers");
}
//check if any layers are Point layers
bool containsPointLayer = false;
for (int n = mapLayers.Count - 1; n >= 0; --n)
{
if (mapLayers[n].ShapeType == ShapeType.Point || mapLayers[n].ShapeType == ShapeType.PointM || mapLayers[n].ShapeType == ShapeType.PointZ)
{
containsPointLayer = true;
}
}
if (containsPointLayer)
{
//draw to an image w x h so that labels overlapping tiles are rendered
Bitmap bm = new Bitmap(256, 256, PixelFormat.Format24bppRgb);
Bitmap bm2 = new Bitmap(w, h, PixelFormat.Format24bppRgb);
try
{
Graphics g = Graphics.FromImage(bm);
Graphics g2 = Graphics.FromImage(bm2);
try
{
g2.Clear(MapBackgroundColor);
RenderMap(g2, mapLayers, w, h, centerPoint, zoom);
g.DrawImage(bm2, Rectangle.FromLTRB(0, 0, 256, 256), Rectangle.FromLTRB(256, 256, 512, 512), GraphicsUnit.Pixel);
//perform custom painting
}
finally
{
g.Dispose();
g2.Dispose();
}
using (MemoryStream ms = new MemoryStream())
{
if (useCache)
{
try
{
bm.Save(cachePath, ImageFormat.Png);
}
catch { }
}
bm.Save(ms, ImageFormat.Png);
context.Response.Cache.SetCacheability(HttpCacheability.Public);
context.Response.Cache.SetExpires(DateTime.Now.AddDays(7));
ms.WriteTo(context.Response.OutputStream);
}
}
finally
{
bm.Dispose();
bm2.Dispose();
}
}
else
{
Bitmap bm = new Bitmap(256, 256, PixelFormat.Format24bppRgb);
try
{
Graphics g = Graphics.FromImage(bm);
try
{
g.Clear(MapBackgroundColor);
RenderMap(g, mapLayers, 256, 256, centerPoint, zoom);
//perform custom painting
}
finally
{
g.Dispose();
}
using (MemoryStream ms = new MemoryStream())
{
if (useCache)
{
try
{
bm.Save(cachePath, ImageFormat.Png);
}
catch { }
}
bm.Save(ms, ImageFormat.Png);
context.Response.Cache.SetCacheability(HttpCacheability.Public);
context.Response.Cache.SetExpires(DateTime.Now.AddDays(7));
ms.WriteTo(context.Response.OutputStream);
}
}
finally
{
bm.Dispose();
}
}
context.Response.Flush();
}