public static Visibility IsPoiVisible(PoiViewItem item, ElevationProfileData elevationProfileData)
{
if (elevationProfileData == null)
{
return(Visibility.Visible);
}
var leftPoints = elevationProfileData.GetData((int)item.GpsLocation.Bearing);
var rightPoints = elevationProfileData.GetData((int)GpsUtils.Normalize360(item.GpsLocation.Bearing.Value + 1));
if (leftPoints == null || rightPoints == null)
{
return(Visibility.Visible);
}
var maxLeft = new GpsLocation()
{
VerticalViewAngle = -100, Distance = 100
};
var leftPoints2 = leftPoints.GetPoints().Where(p => p.Distance < item.GpsLocation.Distance);
if (leftPoints2.Any())
{
maxLeft = leftPoints2.Aggregate((max, item2) => item2?.VerticalViewAngle > max?.VerticalViewAngle ? item2 : max);
}
var maxRight = new GpsLocation()
{
VerticalViewAngle = -100, Distance = 100
};
var rightPoints2 = rightPoints.GetPoints().Where(p => p.Distance < item.GpsLocation.Distance);
if (rightPoints2.Any())
{
maxRight = rightPoints2.Aggregate((max, item2) => item2?.VerticalViewAngle > max?.VerticalViewAngle ? item2 : max);
}
var maxViewAngle = maxRight.VerticalViewAngle > maxLeft.VerticalViewAngle ? maxRight : maxLeft;
var itemViewAngle = item.VerticalViewAngle;
var viewAngleDiff = item.VerticalViewAngle - maxViewAngle.VerticalViewAngle;
var viewAngleDistance = item.GpsLocation.Distance - maxViewAngle.Distance;
var viewAngleVisibilityLimit = -(itemViewAngle * 0.01 + 0.0);
var viewAnglePartVisibilityLimit = -(itemViewAngle * 0.2 + 1.0);
var distancePartVisibilityLimit = 2000;//m
if (viewAngleDiff > viewAngleVisibilityLimit)
{
return(Visibility.Visible);
}
if (viewAngleDiff > viewAnglePartVisibilityLimit && viewAngleDistance < distancePartVisibilityLimit)
{
return(Visibility.PartialyVisible);
}
return(Visibility.Invisible);
}
private void UpdateHeading(double?heading)
{
if (heading.HasValue)
{
_editTextHeading.Text = $"{GpsUtils.Normalize360(heading.Value):F1}".Replace(",", ".");
}
else
{
_editTextHeading.Text = "";
}
}