/// <summary>
/// Gives each label a size.
/// By default they don't have a size so we must fill it in.
/// </summary>
private static void AddLabelSizes(GeometryGraph graph)
{
foreach (Label label in graph.CollectAllLabels())
{
label.Width = 30;
label.Height = 15;
}
}
/// <summary>
/// Verifies that the graph conforms to the correct aspect ratio.
/// </summary>
private static void VerifyAspectRatio(GeometryGraph graph, double aspectRatio)
{
double ratioTolerance = aspectRatio * 0.2;
// Verify the graph is the correct size
Assert.AreEqual(aspectRatio, (graph.Width - (graph.Margins * 2)) / (graph.Height - (graph.Margins * 2)), ratioTolerance, "The graph does not conform to the aspect ratio.");
// Verify the nodes were spread apart to fill the space
IEnumerable <Rectangle> nodeBoxes = graph.Nodes.Select(n => n.BoundingBox);
IEnumerable <Rectangle> edgeBoxes = graph.Edges.Select(e => e.BoundingBox);
IEnumerable <Rectangle> labelBoxes = graph.CollectAllLabels().Select(l => l.BoundingBox);
Rectangle itemBounds = new Rectangle(nodeBoxes.Concat(edgeBoxes).Concat(labelBoxes));
Assert.AreEqual(aspectRatio, itemBounds.Width / itemBounds.Height, ratioTolerance, "The graph's nodes do not conform to the aspect ratio.");
}
public void LabelsNearEdges()
{
// Setup
string filePath = Path.Combine(this.TestContext.TestDir, "Out\\Dots", "chat.dot");
GeometryGraph graph = this.LoadGraph(filePath);
AddLabelSizes(graph);
Assert.IsTrue(graph.CollectAllLabels().Count > 0, "The loaded graph has no labels.");
// Execute
LayeredLayout layeredLayout = new LayeredLayout(graph, new SugiyamaLayoutSettings());
layeredLayout.Run();
// Verify
foreach (Edge edge in graph.Edges)
{
VerifyLabelIsNearEdges(edge);
// We do not verify that labels don't overlap other edges,
// since that is not gauranteed by sugiyama layout.
}
}