public void BuildGraphAndSearchShortestPathUsingGraphBuilder()
{
// Build algorithm
GraphBuilder builder = new GraphBuilder();
builder.Add(a);
builder.Add(b, c);
builder.Add(d);
DijkstraShortestPathAlgorithm<IPoint, IEdge<IPoint>> algorithm = builder.PrepareAlgorithm();
// Attach a distance observer to give us the shortest path distances
VertexDistanceRecorderObserver<IPoint, IEdge<IPoint>> distObserver =
new VertexDistanceRecorderObserver<IPoint, IEdge<IPoint>>();
distObserver.Attach(algorithm);
// Attach a Vertex Predecessor Recorder Observer to give us the paths
VertexPredecessorRecorderObserver<IPoint, IEdge<IPoint>> predecessorObserver =
new VertexPredecessorRecorderObserver<IPoint, IEdge<IPoint>>();
predecessorObserver.Attach(algorithm);
// Run algorithm
algorithm.Compute(start);
// Check results
int distance = distObserver.Distances[end];
Assert.AreEqual(2, distance);
IDictionary<IPoint, IEdge<IPoint>> predecessors = predecessorObserver.VertexPredecessors;
for (int i = 0; i < distance; i++)
{
IEdge<IPoint> edge = predecessors[end];
if (i == 0)
{
Assert.AreEqual(d.GetPointN(d.NumPoints - 2), edge.Source);
Assert.AreEqual(d.EndPoint, edge.Target);
}
else if (i == 1)
{
Assert.AreEqual(a.StartPoint, edge.Source);
Assert.AreEqual(d.GetPointN(d.NumPoints - 2), edge.Target);
}
end = edge.Source;
}
// Detach the observers
distObserver.Detach(algorithm);
predecessorObserver.Detach(algorithm);
}
public void CheckGraphBuilderExceptionUsingARepeatedGeometry()
{
GraphBuilder builder = new GraphBuilder();
Assert.IsTrue(builder.Add(a));
Assert.IsFalse(builder.Add(a));
builder.PrepareAlgorithm();
}
public void CheckGraphBuilderExceptionUsingDifferentFactories()
{
GraphBuilder builder = new GraphBuilder();
Assert.IsTrue(builder.Add(a));
Assert.IsTrue(builder.Add(b, c));
Assert.IsTrue(builder.Add(d));
builder.Add(GeometryFactory.Default.CreateLineString(new ICoordinate[]
{
new Coordinate(0 ,0),
new Coordinate(50 , 50),
}));
}
public void CheckGraphBuilderExceptionUsingNoGeometries()
{
GraphBuilder builder = new GraphBuilder();
builder.PrepareAlgorithm();
}