/// <summary>
/// Creates a GraphBuilder instance that's preconfigured with our demo's styles.
/// </summary>
internal static (GraphBuilder, NodesSource <INeo4jNode>, EdgesSource <IRelationship>) CreateGraphBuilder(GraphControl graphControl, IGraph graph, List <INeo4jNode> nodes, List <IRelationship> edges)
{
var builder = new GraphBuilder(graph);
var nodesSource = builder.CreateNodesSource(nodes, n => n.Id);
nodesSource.NodeCreator.TagProvider = n => n;
var nodeStyle = new Neo4JNodeStyle();
nodesSource.NodeCreator.Defaults.Style = nodeStyle;
nodesSource.NodeCreator.Defaults.Size = new SizeD(240, 80);
var edgesSource = builder.CreateEdgesSource(edges, e => e.StartNodeId, e => e.EndNodeId, e => e.Id);
edgesSource.EdgeCreator.Defaults.Style = new BezierEdgeStyle {
TargetArrow = Arrows.Default
};
var labelBinding = edgesSource.EdgeCreator.CreateLabelBinding(item => item.Type);
labelBinding.Defaults.LayoutParameter = new EdgeSegmentLabelModel().CreateParameterFromSource(0, 0, EdgeSides.AboveEdge);
builder.NodeCreated +=
(sender, e) => {
// Ensure that nodes have the correct size
e.Graph.SetNodeLayout(e.Item, RectD.FromCenter(e.Item.Layout.GetCenter(), nodeStyle.GetPreferredSize(e.Item)));
};
return(builder, nodesSource, edgesSource);
}
/// <summary>
/// Called to render the combo box items.
/// </summary>
private void DrawComboBoxItem(object sender, DrawItemEventArgs e)
{
e.DrawBackground();
e.DrawFocusRectangle();
var node = Nodes[e.Index];
var item = (INeo4jNode)node.Tag;
var style = new Neo4JNodeStyle();
var dummyNode = new SimpleNode {
Layout = new RectD(0, 0, 240, 75), Tag = item, Style = style
};
var context = new RenderContext(e.Graphics, canvasControl);
var visual = style.Renderer.GetVisualCreator(dummyNode, style).CreateVisual(context);
((VisualGroup)visual).Transform = new Matrix();
((VisualGroup)visual).Transform.Translate(e.Bounds.X, e.Bounds.Y);
visual.Paint(context, e.Graphics);
}
