private void InitializeGraphDefaults(IGraph graph)
{
graph.NodeDefaults.Style = new ShinyPlateNodeStyle {
Brush = Brushes.Orange
};
graph.NodeDefaults.Size = new SizeD(100, 50);
// create a label style that shows the labels bounds
DefaultLabelStyle labelStyle = new DefaultLabelStyle {
BackgroundPen = Pens.LightGray,
BackgroundBrush = new SolidBrush(Color.FromArgb(0x77, 0xCC, 0xFF, 0xFF)),
StringFormat = new StringFormat()
{
Alignment = StringAlignment.Center
}
};
graph.NodeDefaults.Labels.Style = labelStyle;
//Our resize logic does not work together with all label models resp. label model parameters
//for simplicity, we just use a centered label for nodes
graph.NodeDefaults.Labels.LayoutParameter =
new GenericLabelModel(InteriorLabelModel.Center).CreateDefaultParameter();
graph.EdgeDefaults.Labels.Style = labelStyle;
var labelModel = new EdgeSegmentLabelModel {
Distance = 10
};
graph.EdgeDefaults.Labels.LayoutParameter = labelModel.CreateParameterFromSource(0, 0.5, EdgeSides.RightOfEdge);
graph.SetUndoEngineEnabled(true);
}
/// <summary>
/// Set up default label model parameters for graph elements.
/// </summary>
/// <remarks>
/// Label model parameters control the actual label placement as well as the available
/// placement candidates when moving the label interactively.
/// </remarks>
private void SetDefaultLabelParameters() {
#region Default node label model parameter
// For node labels, the default is a label position at the node center
// Let's keep the default. Here is how to set it manually
Graph.NodeDefaults.Labels.LayoutParameter = InteriorLabelModel.Center;
#endregion
#region Default edge label parameter
// For edge labels, the default is a label that is rotated to match the associated edge segment
// We'll start by creating a model that is similar to the default:
EdgeSegmentLabelModel edgeSegmentLabelModel = new EdgeSegmentLabelModel();
// However, by default, the rotated label is centered on the edge path.
// Let's move the label off of the path:
edgeSegmentLabelModel.Distance = 10;
// Finally, we can set this label model as the default for edge labels using a location at the center of the first segment
Graph.EdgeDefaults.Labels.LayoutParameter = edgeSegmentLabelModel.CreateParameterFromSource(0, 0.5, EdgeSides.RightOfEdge);
#endregion
}
private void SetupEdgeLabelModels(IGraph coreGraph, string edgeLabelingName)
{
if (edgeLabelingName == AS_IS)
{
return;
}
ILabelModel model;
bool selectionOnly = (bool)Handler.GetValue(SCOPE, CONSIDER_SELECTED_FEATURES_ONLY);
bool placeEdgeLabels = (bool)Handler.GetValue(SCOPE, PLACE_EDGE_LABELS);
bool autoRotate = (bool)Handler.GetValue(MODEL, AUTO_ROTATE);
if (!placeEdgeLabels)
{
return;
}
switch (edgeLabelingName)
{
case CENTER_SLIDER:
model = new EdgeSegmentLabelModel {
AutoRotation = autoRotate, SideOfEdge = EdgeSides.OnEdge
};
break;
case SIDE_SLIDER:
model = new EdgeSegmentLabelModel {
AutoRotation = autoRotate, Distance = 10, SideOfEdge = EdgeSides.LeftOfEdge | EdgeSides.RightOfEdge
};
break;
case NINE_POS:
model = new NinePositionsEdgeLabelModel();
break;
case FREE:
case BEST:
model = new FreeEdgeLabelModel();
break;
default:
throw new ArgumentException(UNKNOWN_MODEL_VALUE + edgeLabelingName, "edgeLabelingName");
}
foreach (ILabel label in coreGraph.Labels)
{
if (label.Owner is IEdge)
{
if (selectionOnly)
{
if (base.IsSelected(label))
{
coreGraph.SetLabelLayoutParameter(label, model.CreateDefaultParameter());
}
}
else
{
coreGraph.SetLabelLayoutParameter(label, model.CreateDefaultParameter());
}
}
}
}
