/// <summary>
/// Gets the first point on the given edge starting a the given vertex.
/// </summary>
public static Coordinate GetFirstPoint(this RoutingNetwork graph, RoutingEdge edge, uint vertex)
{
var points = new List <Coordinate>();
if (edge.From == vertex)
{ // start at from.
if (edge.Shape == null)
{
return(graph.GetVertex(edge.To));
}
var shape = edge.Shape.GetEnumerator();
shape.MoveNext();
return(shape.Current);
}
else if (edge.To == vertex)
{ // start at to.
if (edge.Shape == null)
{
return(graph.GetVertex(edge.From));
}
var shape = edge.Shape.Reverse().GetEnumerator();
shape.MoveNext();
return(shape.Current);
}
throw new ArgumentOutOfRangeException(string.Format("Vertex {0} is not part of edge {1}.",
vertex, edge.Id));
}
/// <summary>
/// Returns a directed version of the edge-id. Smaller than 0 if inverted, as-is if not inverted.
/// </summary>
/// <remarks>
/// The relationship between a regular edge id and a directed edge id:
/// - 0 -> 1 forward, -1 backward.
/// - all other id's are offset by 1 and postive when forward, negative when backward.
/// </remarks>
public static long IdDirected(this RoutingEdge edge)
{
if (edge.DataInverted)
{
return(-(edge.Id + 1));
}
return(edge.Id + 1);
}
/// <summary>
/// Gets the vertex on this edge that is not the given vertex.
/// </summary>
public static uint GetOther(this RoutingEdge edge, uint vertex)
{
if (edge.From == vertex)
{
return(edge.To);
}
else if (edge.To == vertex)
{
return(edge.From);
}
throw new ArgumentOutOfRangeException(string.Format("Vertex {0} is not part of edge {1}.",
vertex, edge.Id));
}
/// <summary>
/// Gets the shape points including the two vertices.
/// </summary>
public static List <Coordinate> GetShape(this RoutingNetwork graph, RoutingEdge edge)
{
var points = new List <Coordinate>();
points.Add(graph.GetVertex(edge.From));
var shape = edge.Shape;
if (shape != null)
{
if (edge.DataInverted)
{
shape = shape.Reverse();
}
var shapeEnumerator = shape.GetEnumerator();
shapeEnumerator.Reset();
while (shapeEnumerator.MoveNext())
{
points.Add(shapeEnumerator.Current);
}
}
points.Add(graph.GetVertex(edge.To));
return(points);
}
