// Accept user click point and find nearest target geometry point
private async Task GetNearestCoordAsync(bool vertexOnly)
{
var target = _targetLayer.Graphics.Select(g => g.Geometry).FirstOrDefault();
if (target == null)
{
return;
}
txtInstruct.Text = "Click the map to find the nearest coordinate in the selected geometry";
var point = await mapView.Editor.RequestPointAsync();
ProximityResult result = null;
if (vertexOnly)
{
result = GeometryEngine.NearestVertexInGeometry(target, point);
}
else
{
result = GeometryEngine.NearestCoordinateInGeometry(target, point);
}
_coordinateLayer.Graphics.Clear();
_coordinateLayer.Graphics.Add(new Graphic(point, _userPointSymbol));
_coordinateLayer.Graphics.Add(new Graphic(result.Point));
txtResult.Visibility = Visibility.Visible;
txtResult.Text = string.Format("Nearest Point: Index: {0}, Distance: {1:0.000}", result.PointIndex, result.Distance);
}
/// <summary>
/// Call this to set your current location and update directions based on that.
/// </summary>
/// <param name="location"></param>
public void SetCurrentLocation(MapPoint location)
{
RouteDirection closest = null;
double distance = double.NaN;
MapPoint snappedLocation = null;
Route direction = null;
// Find the route part that we are currently on by snapping to each segment and see which one is the closest
foreach (var dir in m_route.Routes)
{
var closestCandidate = (from a in dir.RouteDirections
where a.Geometry is Polyline
select new { Direction = a, Proximity = GeometryEngine.NearestCoordinateInGeometry(a.Geometry, location) }).OrderBy(b => b.Proximity.Distance).FirstOrDefault();
if (double.IsNaN(distance) || distance < closestCandidate.Proximity.Distance)
{
distance = closestCandidate.Proximity.Distance;
closest = closestCandidate.Direction;
snappedLocation = closestCandidate.Proximity.Point;
direction = dir;
}
}
if (closest != null)
{
var directions = direction.RouteDirections.ToList();
var idx = directions.IndexOf(closest);
if (idx < directions.Count)
{
RouteDirection next = directions[idx + 1];
//calculate how much is left of current route segment
var segment = closest.Geometry as Polyline;
var proximity = GeometryEngine.NearestVertexInGeometry(segment, snappedLocation);
double frac = 1 - GetFractionAlongLine(segment, proximity, snappedLocation);
TimeSpan timeLeft = new TimeSpan((long)(closest.Time.Ticks * frac));
double segmentLengthLeft = (Convert.ToDouble(closest.GetLength(LinearUnits.Meters))) * frac;
//Sum up the time and lengths for the remaining route segments
TimeSpan totalTimeLeft = timeLeft;
double totallength = segmentLengthLeft;
for (int i = idx + 1; i < directions.Count; i++)
{
totalTimeLeft += directions[i].Time;
totallength += directions[i].GetLength(LinearUnits.Meters);
}
//Update properties
TimeToWaypoint = TimeSpan.FromSeconds(Math.Round(timeLeft.TotalSeconds));
TimeToDestination = TimeSpan.FromSeconds(Math.Round(totalTimeLeft.TotalSeconds));
DistanceToWaypoint = Math.Round(segmentLengthLeft);
DistanceToDestination = Math.Round(totallength);
SnappedLocation = snappedLocation;
var maneuverType = next.ManeuverType;
#if NETFX_CORE || WINDOWS_PHONE
ManeuverImage = new Uri(string.Format("ms-appx:///Assets/Maneuvers/{0}.png", maneuverType));
#else
ManeuverImage = new Uri(string.Format("pack://application:,,,/Assets/Maneuvers/{0}.png", maneuverType));
#endif
NextManeuver = next.Text;
RaisePropertiesChanged(new string[] {
"NextManeuver", "SnappedLocation", "CurrentDirection", "TimeToWaypoint",
"DistanceToDestination", "DistanceToWaypoint", "TimeToDestination",
"MilesToDestination", "MilesToWaypoint", "ManeuverImage"
});
}
}
}