public void ProcessRequest(HttpContext context)
{
HeatMapHandlerQueryStringParser parser = new HeatMapHandlerQueryStringParser(context.Request.QueryString);
context.Response.Clear();
context.Response.ContentType = IMAGE_TYPE;
try
{
var outStream = new MemoryStream();
IList<HeatPoint> list = parser.GetHeatPointList(true);
bool showTileBorder = parser.GetShowTileBorder();
if (0 == list.Count) Error(context, new Exception("data list was empty in request " + context.Request.Url.Query));
Size mapSize = parser.GetHeatMapSize();
Size windowSize = parser.GetHeatMapWindowSize();
Point windowTopLeftCorner = parser.GetWindowTopLeftCornerPoint();
if (windowSize.Height + windowTopLeftCorner.Y > mapSize.Height) windowSize.Height = mapSize.Height - windowTopLeftCorner.Y;
if (windowSize.Width + windowTopLeftCorner.X > mapSize.Width) windowSize.Width = mapSize.Width - windowTopLeftCorner.X;
var hm = new HeatMap(list, mapSize);
Bitmap img = hm.GetBitmap();
img = hm.GetWindow(img, windowSize, windowTopLeftCorner);
if (showTileBorder) img = hm.AddBorder(img);
img.Save(outStream, ImageFormat.Png);
outStream.WriteTo(context.Response.OutputStream);
}
catch (Exception ex)
{
Error(context, ex);
}
}
public Tile(HeatPointList heatPoints, HeatmapSettings settings, Bounds bounds)
{
Bounds = bounds;
Bounds heatMapBounds = new Bounds(bounds);
heatMapBounds.TopLeftLat += settings.Size / 2 * this.DegreesPerPixelLat;
heatMapBounds.TopLeftLng -= settings.Size / 2 * this.DegreesPerPixelLng;
heatMapBounds.BottomRightLat -= settings.Size / 2 * this.DegreesPerPixelLat;
heatMapBounds.BottomRightLng += settings.Size / 2 * this.DegreesPerPixelLng;
HeatPointList pointsWithinBounds = new HeatPointList();
foreach (HeatPoint hp in heatPoints)
{
if (heatMapBounds.Contains(hp)) pointsWithinBounds.Add(hp);
}
HeatMap = new HeatMap(pointsWithinBounds, settings, heatMapBounds);
}
