public static bool PolyContainsPointXY(List <PointXY> PointXYs, PointXY p)
{
bool inside = false;
// An imaginary closing segment is implied,
// so begin testing with that.
PointXY v1 = PointXYs[PointXYs.Count - 1];
foreach (PointXY v0 in PointXYs)
{
double d1 = (p.Y - v0.Y) * (v1.X - v0.X);
double d2 = (p.X - v0.X) * (v1.Y - v0.Y);
if (p.Y < v1.Y)
{
// V1 below ray
if (v0.Y <= p.Y)
{
// V0 on or above ray
// Perform intersection test
if (d1 > d2)
{
inside = !inside; // Toggle state
}
}
}
else if (p.Y < v0.Y)
{
// V1 is on or above ray, V0 is below ray
// Perform intersection test
if (d1 < d2)
{
inside = !inside; // Toggle state
}
}
v1 = v0; //Store previous endPointXY as next startPointXY
}
return(inside);
}
public List <VesselInfo> GetAllShipInArea(List <LatLngLiteral> Area)
{
var list = new List <VesselInfo>();
try
{
foreach (var item in ShipPositions.Values)
{
PointXY loc;
VesselInfo data = null;
if (item[item.Count - 1] is PositionReportClassAMessage)
{
var obj = item[item.Count - 1] as PositionReportClassAMessage;
if (!ShipDatas.ContainsKey(obj.Mmsi))
{
continue;
}
var shipInfo = ShipDatas[obj.Mmsi].Last() as StaticAndVoyageRelatedDataMessage;
loc = new PointXY(obj.Latitude, obj.Longitude);
data = new VesselInfo()
{
Mmsi = obj.Mmsi, Lat = obj.Latitude, Course = obj.CourseOverGround, Dest = shipInfo.Destination, ETA = $"{shipInfo.EtaDay}/{shipInfo.EtaMonth} {shipInfo.EtaHour}:{shipInfo.EtaMinute}", Lng = obj.Longitude, ShipName = shipInfo.ShipName, Speed = obj.SpeedOverGround, Status = obj.NavigationStatus.ToString(), Direction = obj.TrueHeading
};
}
else if (item[item.Count - 1] is ExtendedClassBCsPositionReportMessage)
{
var obj = item[item.Count - 1] as ExtendedClassBCsPositionReportMessage;
if (!ShipDatas.ContainsKey(obj.Mmsi))
{
continue;
}
var shipInfo = ShipDatas[obj.Mmsi].Last() as StaticAndVoyageRelatedDataMessage;
loc = new PointXY(obj.Latitude, obj.Longitude);
data = new VesselInfo()
{
Mmsi = obj.Mmsi, Lat = obj.Latitude, Course = obj.CourseOverGround, Dest = shipInfo.Destination, ETA = $"{shipInfo.EtaDay}/{shipInfo.EtaMonth} {shipInfo.EtaHour}:{shipInfo.EtaMinute}", Lng = obj.Longitude, ShipName = shipInfo.ShipName, Speed = obj.SpeedOverGround, Status = "", Direction = obj.TrueHeading
};
}
if (data != null)
{
if (Area == null)
{
list.Add(data);
}
else if (GeoFence.PointInPolygon(new LatLngLiteral()
{
Lat = data.Lat, Lng = data.Lng
}, Area))
{
list.Add(data);
}
}
}
}
catch (Exception ex)
{
Console.WriteLine("get ships error : " + ex.Message);
}
return(list);
}
public static PointXY Rotate(this PointXY pt, double angle, PointXY center)
{
Vector v = new Vector(pt.X - center.X, pt.Y - center.Y).Rotate(angle);
return(new PointXY(v.X + center.X, v.Y + center.Y));
}
