/// <summary>
/// Copy all labels of the given edge.
/// </summary>
private void CopyEdgeLabels(LayoutGraph pageLayoutGraph, IGraph pageView, Edge layoutEdge, IEdge copiedEdge, IEdge modelEdge, ILabelDefaults labelDefaults)
{
IEdgeLabelLayout[] edgeLabels = pageLayoutGraph.GetLabelLayout(layoutEdge);
for (int i = 0; i < edgeLabels.Length; i++)
{
// get the label layout from the layout graph
IEdgeLabelLayout edgeLabelLayout = edgeLabels[i];
// get the original label from the model graph
ILabel edgeModelLabel = modelEdge.Labels[i];
CopyEdgeLabel(pageView, edgeLabelLayout, edgeModelLabel, copiedEdge, labelDefaults);
}
}
/// <summary>
/// Returns the calculated location of the edge label. Note that the labeling
/// machinery returns the edge labels positions as a parameter
/// of the model that belongs to the label. This model parameter can be used
/// to retrieve the actual location of the label as shown in this method.
/// </summary>
private static YPoint GetEdgeLabelLocation(LayoutGraph graph, Edge e, IEdgeLabelLayout ell)
{
var placement = ell.LabelModel.GetLabelPlacement(
ell.BoundingBox,
graph.GetLayout(e),
graph.GetLayout(e.Source),
graph.GetLayout(e.Target),
ell.ModelParameter);
YPoint ellp = new YPoint(placement.Anchor.X, placement.Anchor.Y - placement.Height);
return(ellp);
}
/// <summary>
/// Copy one edge label.
/// </summary>
/// <param name="pageView">The view (i.e. target) graph.</param>
/// <param name="edgeLabelLayout">The layout of the label.</param>
/// <param name="modelLabel">The original label.</param>
/// <param name="viewEdge">The copied edge (from the view graph).</param>
/// <param name="labelDefaults"></param>
/// <returns>The copied label.</returns>
private ILabel CopyEdgeLabel(IGraph pageView, IEdgeLabelLayout edgeLabelLayout, ILabel modelLabel, IEdge viewEdge, ILabelDefaults labelDefaults)
{
// get the style from edgeLabelStyle property. If none is set get it from the original (model) label.
ILabelStyle style = (ILabelStyle)(labelDefaults.Style != NullLabelStyle ?
labelDefaults.GetStyleInstance(viewEdge) :
modelLabel.Style.Clone());
ILabelModelParameter parameter = labelDefaults.LayoutParameter != NullLabelModelParameter
? labelDefaults.GetLayoutParameterInstance(viewEdge)
: (ILabelModelParameter)edgeLabelLayout.ModelParameter;
// create a new label in the view graph using the style,
// the text from the original label and the layout from the layout graph
ILabel viewLabel = pageView.AddLabel(viewEdge, modelLabel.Text, parameter, style);
viewLabel.Tag = modelLabel.Tag;
return(viewLabel);
}
private static YOrientedRectangle GetEdgeLabelLocation(LayoutGraph graph, Edge e, IEdgeLabelLayout ell)
{
YOrientedRectangle ellp = ell.LabelModel.GetLabelPlacement(
ell.BoundingBox,
graph.GetLayout(e),
graph.GetLayout(e.Source),
graph.GetLayout(e.Target),
ell.ModelParameter);
return(ellp);
}
protected void PaintEdgeLabel(Graphics g, LayoutGraph graph, Edge edge, IEdgeLabelLayout label)
{
YOrientedRectangle pos = GetEdgeLabelLocation(graph, edge, label);
DrawOrientedRect(pos, g);
}