/// <summary>
/// Returns the location on the graph.
/// </summary>
public static Coordinate LocationOnGraph(this GeometricGraph graph, uint edgeId, ushort offset)
{
var geometricEdge = graph.GetEdge(edgeId);
var shape = graph.GetShape(geometricEdge);
var length = graph.Length(geometricEdge);
var currentLength = 0.0;
var targetLength = length * (offset / (double)ushort.MaxValue);
for (var i = 1; i < shape.Count; i++)
{
var segmentLength = Coordinate.DistanceEstimateInMeter(shape[i - 1], shape[i]);
if (segmentLength + currentLength > targetLength)
{
var segmentOffsetLength = segmentLength + currentLength - targetLength;
var segmentOffset = 1 - (segmentOffsetLength / segmentLength);
short?elevation = null;
if (shape[i - 1].Elevation.HasValue &&
shape[i].Elevation.HasValue)
{
elevation = (short)(shape[i - 1].Elevation.Value + (segmentOffset * (shape[i].Elevation.Value - shape[i - 1].Elevation.Value)));
}
return(new Coordinate()
{
Latitude = (float)(shape[i - 1].Latitude + (segmentOffset * (shape[i].Latitude - shape[i - 1].Latitude))),
Longitude = (float)(shape[i - 1].Longitude + (segmentOffset * (shape[i].Longitude - shape[i - 1].Longitude))),
Elevation = elevation
});
}
currentLength += segmentLength;
}
return(shape[shape.Count - 1]);
}
/// <summary>
/// Gets the given edge.
/// </summary>
public static GeometricEdge GetEdge(this GeometricGraph graph, long directedEdgeId)
{
if (directedEdgeId == 0)
{
throw new ArgumentOutOfRangeException("directedEdgeId");
}
uint edgeId;
if (directedEdgeId > 0)
{
edgeId = (uint)directedEdgeId - 1;
}
else
{
edgeId = (uint)((-directedEdgeId) - 1);
}
return(graph.GetEdge(edgeId));
}