/// <summary>
/// Creates an object containing all necessary data to create an edge visual
/// </summary>
private static RenderDataCache CreateRenderDataCache(IRenderContext context, ILabel edge)
{
IGraphSelection selection = context.CanvasControl != null?context.CanvasControl.Lookup <IGraphSelection>() : null;
bool selected = selection != null && selection.IsSelected(edge);
return(new RenderDataCache(selected));
}
/// <summary>
/// Creates an object containing all necessary data to create an edge visual
/// </summary>
private RenderDataCache CreateRenderDataCache(IRenderContext context, IEdge edge)
{
IGraphSelection selection = context.CanvasControl != null?context.CanvasControl.Lookup <IGraphSelection>() : null;
bool selected = selection != null && selection.IsSelected(edge);
return(new RenderDataCache(PathThickness, selected, GetPath(edge), Arrows));
}
/// <summary>
/// Creates an object containing all necessary data to create an edge visual
/// </summary>
private RenderDataCache CreateRenderDataCache(IRenderContext context, IEdge edge)
{
IGraphSelection selection = context.CanvasControl != null?context.CanvasControl.Lookup <IGraphSelection>() : null;
bool selected = selection != null && selection.IsSelected(edge);
//////////////// New in this sample ////////////////
// The RenderDataCache now also holds information about the bridges (the obstacle hash)
// so the edge will be re-rendered after the bridges have changed
// Note that the cached path is the edge path *without* bridges
return(new RenderDataCache(PathThickness, selected, GetPath(edge), Arrows, GetObstacleHash(context)));
}
/// <summary>
/// Collect all <see cref="IGraphSelection.SelectedNodes">selected nodes</see> and their descendents.
/// </summary>
private IList <INode> CollectReshapeNodes(IGraph graph, IGraphSelection selection)
{
var nodes = new HashSet <INode>();
foreach (var node in selection.SelectedNodes)
{
if (nodes.Add(node) && graph.IsGroupNode(node))
{
foreach (var descendant in graph.GetGroupingSupport().GetDescendants(node))
{
nodes.Add(descendant);
}
}
}
return(nodes.ToList());
}
public DemoEdgeStyleRenderer(IGraphSelection selection, bool highlight)
{
this.selection = selection;
this.highlight = highlight;
}
protected override VisualGroup CreateVisual(IRenderContext context, ILabel label)
{
// Updates the dummy label which is internally used for rendering with the properties of the given label.
UpdateDummyLabel(context, label);
// creates the container for the visual and sets a transform for view coordinates
var container = new VisualGroup();
var toViewTransform = context.WorldTransform.Clone();
toViewTransform.Invert();
// ReSharper disable once PossibleUnintendedReferenceComparison
if (container.Transform != toViewTransform)
{
container.Transform = toViewTransform;
}
var creator = InnerLabelStyle.Renderer.GetVisualCreator(dummyLabel, InnerLabelStyle);
// create a new IRenderContext with a zoom of 1
// TODO: Projections
var innerContext = new RenderContext(context.Graphics, context.CanvasControl)
{
ViewTransform = context.ViewTransform, WorldTransform = context.WorldTransform, Zoom = 1
};
//The wrapped style should always think it's rendering with zoom level 1
var visual = creator.CreateVisual(innerContext);
if (visual == null)
{
return(container);
}
// add the created visual to the container
container.Children.Add(visual);
IGraphSelection selection = context.CanvasControl != null?context.CanvasControl.Lookup <IGraphSelection>() : null;
bool selected = selection != null && selection.IsSelected(label);
// if the label is selected, add the selection visualization, too.
if (selected)
{
//The selection descriptor performs its own calculation in the view coordinate system, so
//the size and the position of the visualization would be wrong and need to be converted back into world
//coordinates
var layout = dummyLabel.GetLayout();
var p1 = context.CanvasControl.ToWorldCoordinates(layout.GetAnchorLocation());
var selectionLayout = new OrientedRectangle
{
Anchor = p1,
Width = layout.Width / context.Zoom,
Height = layout.Height / context.Zoom
};
selectionLayout.SetUpVector(layout.UpX, layout.UpY);
var selectionVisual = new OrientedRectangleIndicatorInstaller().Template;
container.Children.Add(selectionVisual);
}
return(container);
}
