// 鹰眼
private void myMapView_ViewpointChanged(object sender, EventArgs e)
{
// 声明鹰眼地图的覆盖层边框
Esri.ArcGISRuntime.Geometry.Geometry eagleViewEnv = null;
// 每次主地图的焦点改变, 都会清空鹰眼地图的覆盖层
myMapView_Eagle.GraphicsOverlays.Clear();
// 获取主地图的四至
Esri.ArcGISRuntime.Geometry.Polygon vExtent = myMapView.VisibleArea;
// 鹰眼地图的覆盖层边框等于主地图四至
eagleViewEnv = vExtent.Extent;
// 鹰眼地图的覆盖层边框为"红色"
System.Drawing.Color lineColor = System.Drawing.Color.FromName("Red");
// 鹰眼地图的覆盖层边框样式
Esri.ArcGISRuntime.Symbology.SimpleLineSymbol lineSymbol = new Esri.ArcGISRuntime.Symbology.SimpleLineSymbol(Esri.ArcGISRuntime.Symbology.SimpleLineSymbolStyle.Dash, lineColor, 2.0);
System.Drawing.Color fillColor = System.Drawing.Color.FromArgb(0, 255, 255, 255);
Esri.ArcGISRuntime.Symbology.SimpleFillSymbol polySymbol = new Esri.ArcGISRuntime.Symbology.SimpleFillSymbol(Esri.ArcGISRuntime.Symbology.SimpleFillSymbolStyle.Solid, fillColor, lineSymbol);
var graphicOverlay = new Esri.ArcGISRuntime.UI.GraphicsOverlay();
// 几何图层
var envGraphic = new Esri.ArcGISRuntime.UI.Graphic(eagleViewEnv, polySymbol);
// 覆盖层
graphicOverlay.Graphics.Add(envGraphic);
// 覆盖层添加到鹰眼地图
myMapView_Eagle.GraphicsOverlays.Add(graphicOverlay);
}
private async void ProcessMessages(ClientWebSocket socket)
{
string idAttributeField = ServiceInfo.TimeInfo?.TrackIdField ?? ServiceInfo.ObjectIdField;
var buff = new byte[65535];
ArraySegment <byte> buffer = new ArraySegment <byte>(buff);
var sr = ServiceInfo.SpatialReference.AsSpatialReference();
var fields = new Dictionary <string, FieldInfo>();
foreach (var f in from p in ServiceInfo.Fields select new KeyValuePair <string, FieldInfo>(p.Name, p))
{
fields[f.Key] = f.Value;
}
DateTimeOffset lastStaleCheck = DateTimeOffset.Now;
int messageCount = 0;
DateTimeOffset messageCountReset = DateTimeOffset.Now;
while (IsConnected)
{
var result = await socket.ReceiveAsync(buffer, CancellationToken.None).ConfigureAwait(false);
if (!IsConnected)
{
break;
}
messageCount++;
using (var ms = new MemoryStream(buff, 0, result.Count))
{
FeatureMessage p;
try
{
#if __IOS__ || __ANDROID__
p = FeatureMessage.FromJson(Encoding.UTF8.GetString(buff, 0, result.Count));
#else
p = FeatureMessage.FromJson(ms);
#endif
}
catch (System.Exception)
{
Debug.WriteLine("Failed to parse message: " + Encoding.UTF8.GetString(buff, 0, result.Count));
continue;
}
if (p.Geometry == null || p.Attributes == null)
{
continue;
}
foreach (var pair in p.Attributes.ToArray())
{
var type = pair.Value?.GetType();
if (type == typeof(Decimal))
{
p.Attributes[pair.Key] = Convert.ToDouble(pair.Value);
}
if (fields.ContainsKey(pair.Key) && fields[pair.Key].Type == "esriFieldTypeDate" && pair.Value != null)
{
p.Attributes[pair.Key] = DateTimeOffset.FromUnixTimeMilliseconds(Convert.ToInt64(pair.Value));
}
}
if (p.Attributes.ContainsKey(idAttributeField))
{
string id = p.Attributes[idAttributeField].ToString();
MapPoint location;
if (p.Geometry.Z.HasValue)
{
location = new MapPoint(p.Geometry.X, p.Geometry.Y, p.Geometry.Z.Value, sr);
}
else
{
location = new MapPoint(p.Geometry.X, p.Geometry.Y, sr);
}
if (_vehicles.ContainsKey(id)) // update
{
var graphic = _vehicles[id];
foreach (var att in p.Attributes)
{
graphic.Attributes[att.Key] = att.Value;
}
if (AnimateUpdates && AnimationSpeed.TotalMilliseconds > 16)
{
Animations.GeometryAnimatorHelper.AnimatePointTo(graphic, location, AnimationSpeed, null);
}
else
{
graphic.Geometry = location;
}
OnUpdate?.Invoke(this, "Update");
}
else
{
var graphic = new Esri.ArcGISRuntime.UI.Graphic(location, p.Attributes);
_vehicles[id] = graphic;
if (Overlay != null)
{
Overlay.Graphics.Add(graphic);
}
OnUpdate?.Invoke(this, "Add");
}
}
}
DateTimeOffset now = DateTimeOffset.Now;
double timeSinceCountReset = (now - messageCountReset).TotalSeconds;
if (timeSinceCountReset > 10 && messageCount > 10)
{
MessagesPerSecond = messageCount / timeSinceCountReset;
OnUpdate?.Invoke(this, "MessagesPerSecond");
messageCount = 0;
messageCountReset = now;
}
//Check if any features has gone stale and remove them
if (FeatureTimeout < TimeSpan.MaxValue)
{
DateTimeOffset timeoutDate = now - FeatureTimeout;
if (DateTimeOffset.Now - lastStaleCheck > TimeSpan.FromSeconds(10))
{
var timeField = ServiceInfo.TimeInfo?.StartTimeField;
if (!string.IsNullOrEmpty(timeField))
{
var outdated = (from a in _vehicles where a.Value.Attributes.ContainsKey(timeField) && ((DateTimeOffset)a.Value.Attributes[timeField]) < timeoutDate select a.Key).ToArray();
foreach (var key in outdated)
{
var graphic = _vehicles[key];
_vehicles.Remove(key);
if (Overlay != null)
{
Overlay.Graphics.Remove(graphic);
}
}
if (outdated.Length > 0)
{
OnUpdate?.Invoke(this, "Remove");
}
}
lastStaleCheck = DateTimeOffset.Now;
}
}
}
_vehicles.Clear();
Overlay.Graphics.Clear();
}
