/// <summary>
/// Fix the ports for <see cref="RoutingMode.ShortestStraightPathToBorder"/>
/// by enlarging the adjacent segment to the rotated layout.
/// </summary>
/// <param name="graph">The layout graph to work on.</param>
/// <param name="edge">The edge to fix.</param>
/// <param name="path">A <see cref="GeneralPath"/> which represents the rotated layout.</param>
/// <param name="atSource">Whether to fix the source or target port of the edge.</param>
private static void FixPorts(LayoutGraph graph, Edge edge, GeneralPath path, bool atSource)
{
var el = graph.GetLayout(edge);
var pointCount = el.PointCount();
// find the opposite point of the port at the adjacent segment
PointD firstBend = atSource
? (pointCount > 0 ? el.GetPoint(0) : graph.GetTargetPointAbs(edge)).ToPointD()
: (pointCount > 0 ? el.GetPoint(pointCount - 1) : graph.GetSourcePointAbs(edge)).ToPointD();
// The port itself
PointD port = (atSource ? graph.GetSourcePointAbs(edge) : graph.GetTargetPointAbs(edge)).ToPointD();
// The adjacent segment as vector pointing from the opposite point to the port
var direction = port - firstBend;
// find the intersection (there is always one)
var intersection = path.FindRayIntersection(firstBend.ToPointD(), direction);
PointD point = port;
if (intersection < Double.PositiveInfinity)
{
// found an intersection: extend the adjacent segment
point = firstBend + (direction * intersection);
}
else
{
// no intersection: connect to the original port's nearest point
var cursor = path.CreateCursor();
double minDistance = Double.PositiveInfinity;
while (cursor.MoveNext())
{
var distance = port.DistanceTo(cursor.CurrentEndPoint);
if (distance < minDistance)
{
minDistance = distance;
point = cursor.CurrentEndPoint;
}
}
}
// set the port position
if (atSource)
{
graph.SetSourcePointAbs(edge, point.ToYPoint());
}
else
{
graph.SetTargetPointAbs(edge, point.ToYPoint());
}
}
protected void PaintEdge(Graphics g, LayoutGraph graph, Edge e)
{
IEdgeLayout el = graph.GetLayout(e);
YPoint sp = graph.GetSourcePointAbs(e);
YPoint tp = graph.GetTargetPointAbs(e);
PointF[] points = new PointF[el.PointCount() + 2];
points[0] = new PointF((float)sp.X, (float)sp.Y);
points[el.PointCount() + 1] = new PointF((float)tp.X, (float)tp.Y);
for (int i = 0; i < el.PointCount(); i++)
{
YPoint p = el.GetPoint(i);
points[i + 1] = new PointF((float)p.X, (float)p.Y);
}
g.DrawLines(edgePen, points);
}
/// <summary>
/// Called by the various edge creation callbacks to create an edge in the resulting graph view
/// that corresponds to the provided <paramref name="layoutEdge"/>.
/// </summary>
/// <remarks>
/// If a model edge is provided, the edge will be created between the copies of the corresponding
/// source/target ports.
/// </remarks>
///<param name="pageLayoutGraph">The layout graph representing the current page.</param>
///<param name="pageView">The <see cref="IGraph"/> that is built to show the multi-page layout in a graph canvas.</param>
///<param name="layoutEdge">The edge of the layout graph that should be copied.</param>
///<param name="modelEdge">The edge of the original input graph that corresponds to the <paramref name="layoutEdge"/> (may be <see langword="null"/>).</param>
///<param name="edgeDefaults"></param>
///<returns>The created edge</returns>
/// <seealso cref="CreateConnectorEdge"/>
/// <seealso cref="CreateNormalEdge"/>
/// <seealso cref="CreateProxyEdge"/>
/// <seealso cref="CreateProxyReferenceEdge"/>
protected IEdge CreateEdgeCore(LayoutGraph pageLayoutGraph, IGraph pageView, Edge layoutEdge, IEdge modelEdge, IEdgeDefaults edgeDefaults)
{
IEdge viewEdge;
if (modelEdge != null)
{
// if the edge has a model edge: create the copied edge between
// the copies of its source and target ports
IPort modelSourcePort = modelEdge.SourcePort;
IPort modelTargetPort = modelEdge.TargetPort;
IPort viewSourcePort = GetViewPort(modelSourcePort);
IPort viewTargetPort = GetViewPort(modelTargetPort);
IEdgeStyle style = (IEdgeStyle)(edgeDefaults.Style != NullEdgeStyle ?
edgeDefaults.GetStyleInstance() :
modelEdge.Style.Clone());
viewEdge = pageView.CreateEdge(viewSourcePort, viewTargetPort, style, modelEdge.Tag);
}
else
{
// otherwise create it between the copies of its source and target nodes
INode viewSource = GetViewNode(layoutEdge.Source);
INode viewTarget = GetViewNode(layoutEdge.Target);
viewEdge = pageView.CreateEdge(viewSource, viewTarget);
}
// adjust the port location
YPoint newSourcePortLocation = pageLayoutGraph.GetSourcePointAbs(layoutEdge);
YPoint newTargetPortLocation = pageLayoutGraph.GetTargetPointAbs(layoutEdge);
pageView.SetPortLocation(viewEdge.SourcePort, newSourcePortLocation.ToPointD());
pageView.SetPortLocation(viewEdge.TargetPort, newTargetPortLocation.ToPointD());
// and copy the bends
IEdgeLayout edgeLayout = pageLayoutGraph.GetLayout(layoutEdge);
for (int i = 0; i < edgeLayout.PointCount(); i++)
{
YPoint bendLocation = edgeLayout.GetPoint(i);
pageView.AddBend(viewEdge, new PointD(bendLocation.X, bendLocation.Y), i);
}
return(viewEdge);
}
public GraphCanvas(LayoutGraph graph)
{
this.RenderTransform = new TranslateTransform(_padding, _padding);
var grouping = new GroupingSupport(graph);
// Add all edges
foreach (var edge in graph.Edges)
{
IEdgeLayout el = graph.GetLayout(edge);
var l = new Polyline();
l.Stroke = Brushes.Black;
l.Points.Add(new Point(graph.GetSourcePointAbs(edge).X, graph.GetSourcePointAbs(edge).Y));
for (int i = 0; i < el.PointCount(); i++)
{
Point p = new Point(el.GetPoint(i).X, el.GetPoint(i).Y);
l.Points.Add(p);
}
l.Points.Add(new Point(graph.GetTargetPointAbs(edge).X, graph.GetTargetPointAbs(edge).Y));
this.Children.Add(l);
// edge labels
var edgeLabelLayout = graph.GetLabelLayout(edge);
foreach (var labelLayout in edgeLabelLayout)
{
var orientedRectangle = labelLayout.LabelModel.GetLabelPlacement(
labelLayout.BoundingBox,
graph.GetLayout(edge),
graph.GetLayout(edge.Source),
graph.GetLayout(edge.Target),
labelLayout.ModelParameter);
this.Children.Add(GetPolygon(orientedRectangle));
}
}
// add all nodes
foreach (var node in graph.Nodes)
{
INodeLayout nl = graph.GetLayout(node);
Color color = grouping.IsGroupNode(node) ? Color.FromArgb(60, 255, 60, 0) : Color.FromArgb(255, 255, 255, 0);
var rect = new Rectangle();
this.Children.Add(rect);
rect.Stroke = new SolidColorBrush()
{
Color = Colors.Black
};
rect.Fill = new SolidColorBrush()
{
Color = color
};
rect.Width = nl.Width;
rect.Height = nl.Height;
Canvas.SetTop(rect, nl.Y);
Canvas.SetLeft(rect, nl.X);
// display the node index
var text = new TextBlock()
{
Text = String.Empty + node.Index,
HorizontalAlignment = HorizontalAlignment.Center,
VerticalAlignment = VerticalAlignment.Center
};
this.Children.Add(text);
text.Measure(new Size(Double.PositiveInfinity, Double.PositiveInfinity));
Canvas.SetTop(text, nl.Y + nl.Height / 2 - text.DesiredSize.Height / 2);
Canvas.SetLeft(text, nl.X + nl.Width / 2 - text.DesiredSize.Width / 2);
}
}
/// <summary>
/// Executes the layout algorithm.
/// </summary>
/// <remarks>
/// <para>
/// Enlarges the node layout to fully encompass the rotated layout (the rotated layout's bounding box).
/// If the <see cref="EdgeRoutingMode"/> is set to <see cref="RoutingMode.FixedPort"/>
/// port constraints are created to keep the ports at their current location.
/// Existing port constraints are adjusted to the rotation.
/// </para>
/// <para>
/// Then, the <see cref="LayoutStageBase.CoreLayout"/> is executed.
/// </para>
/// <para>
/// After the core layout the original node sizes are restored.
/// If the <see cref="EdgeRoutingMode"/> is set to <see cref="RoutingMode.ShortestStraightPathToBorder"/>
/// the last edge segment is extended from the bounding box to the rotated layout.
/// </para>
/// </remarks>
public override void ApplyLayout(LayoutGraph graph)
{
if (CoreLayout == null)
{
return;
}
var boundsProvider = graph.GetDataProvider(RotatedNodeLayoutDpKey);
if (boundsProvider == null)
{
// no provider: this stage adds nothing to the core layout
CoreLayout.ApplyLayout(graph);
return;
}
bool addedSourcePortConstraints = false;
bool addedTargetPortContstraints = false;
IDataMap sourcePortConstraints = (IDataMap)graph.GetDataProvider(PortConstraintKeys.SourcePortConstraintDpKey);
IDataMap targetPortConstraints = (IDataMap)graph.GetDataProvider(PortConstraintKeys.TargetPortConstraintDpKey);
if (EdgeRoutingMode == RoutingMode.FixedPort)
{
// Fixed port: create port constraints to keep the ports at position
// in this case: create data providers if there are none yet
if (sourcePortConstraints == null)
{
sourcePortConstraints = graph.CreateEdgeMap();
graph.AddDataProvider(PortConstraintKeys.SourcePortConstraintDpKey, sourcePortConstraints);
addedSourcePortConstraints = true;
}
if (targetPortConstraints == null)
{
targetPortConstraints = graph.CreateEdgeMap();
graph.AddDataProvider(PortConstraintKeys.TargetPortConstraintDpKey, targetPortConstraints);
addedTargetPortContstraints = true;
}
}
try {
var originalDimensions = new Dictionary <Node, OldDimensions>();
foreach (var node in graph.Nodes)
{
var nodeShape = (RotatedNodeShape)boundsProvider.Get(node);
var orientedLayout = nodeShape != null ? nodeShape.OrientedLayout : null;
var outline = nodeShape != null ? nodeShape.Outline : null;
if (orientedLayout != null)
{
// if the current node is rotated: apply fixes
// remember old layout and size
var oldLayout = graph.GetLayout(node);
var newLayout = orientedLayout.GetBounds().ToYRectangle();
var offset = new PointD(newLayout.X - oldLayout.X, newLayout.Y - oldLayout.Y);
var originalSize = new SizeD(oldLayout.Width, oldLayout.Height);
var oldDimensions = new OldDimensions {
offset = offset,
size = originalSize,
outline = outline
};
if (EdgeRoutingMode == RoutingMode.FixedPort)
{
// EdgeRoutingMode: FixedPort: keep the ports at their current location
// The oriented layout's corners to find the best PortSide
var tl = new PointD(orientedLayout.AnchorX + orientedLayout.UpX * orientedLayout.Height, orientedLayout.AnchorY + orientedLayout.UpY * orientedLayout.Height);
var tr = new PointD(orientedLayout.AnchorX + orientedLayout.UpX * orientedLayout.Height - orientedLayout.UpY * orientedLayout.Width,
orientedLayout.AnchorY + orientedLayout.UpY * orientedLayout.Height + orientedLayout.UpX * orientedLayout.Width);
var bl = new PointD(orientedLayout.AnchorX, orientedLayout.AnchorY);
var br = new PointD(orientedLayout.AnchorX - orientedLayout.UpY * orientedLayout.Width, orientedLayout.AnchorY + orientedLayout.UpX * orientedLayout.Width);
// for each out edge
foreach (var edge in node.OutEdges)
{
// create a strong port constraint for the side which is closest to the port location (without rotation)
var constraint = sourcePortConstraints.Get(edge);
if (constraint == null)
{
var point = graph.GetSourcePointAbs(edge).ToPointD();
var side = FindBestSide(point, bl, br, tl, tr);
sourcePortConstraints.Set(edge, PortConstraint.Create(side, true));
}
}
foreach (var edge in node.InEdges)
{
// create a strong port constraint for the side which is closest to the port location (without rotation)
var constraint = targetPortConstraints.Get(edge);
if (constraint == null)
{
var point = graph.GetTargetPointAbs(edge).ToPointD();
var side = FindBestSide(point, bl, br, tl, tr);
targetPortConstraints.Set(edge, PortConstraint.Create(side, true));
}
}
}
// For source and target port constraints: fix the PortSide according to the rotation
var angle = Math.Atan2(orientedLayout.UpY, orientedLayout.UpX);
if (sourcePortConstraints != null)
{
foreach (var edge in node.OutEdges)
{
FixPortConstraintSide(sourcePortConstraints, edge, angle);
}
}
if (targetPortConstraints != null)
{
foreach (var edge in node.InEdges)
{
FixPortConstraintSide(targetPortConstraints, edge, angle);
}
}
// enlarge the node layout
var position = new YPoint(newLayout.X, newLayout.Y);
oldDimensions.location = position;
originalDimensions.Add(node, oldDimensions);
graph.SetLocation(node, position);
graph.SetSize(node, newLayout);
}
}
// ===============================================================
CoreLayout.ApplyLayout(graph);
// ===============================================================
var groups = graph.GetDataProvider(GroupingKeys.GroupDpKey);
foreach (var node in graph.Nodes)
{
if (groups != null && groups.GetBool(node))
{
// groups don't need to be adjusted to their former size and location because their bounds are entirely
// calculated by the layout algorithm and they are not rotated
continue;
}
// for each node which has been corrected: undo the correction
var oldDimensions = originalDimensions[node];
var offset = oldDimensions.offset;
var originalSize = oldDimensions.size;
var newLayout = graph.GetLayout(node);
// create a general path representing the new roated layout
var path = oldDimensions.outline;
var transform = new Matrix2D();
transform.Translate(new PointD(newLayout.X - oldDimensions.location.X, newLayout.Y - oldDimensions.location.Y));
path.Transform(transform);
// restore the original size
graph.SetLocation(node, new YPoint(newLayout.X - offset.X, newLayout.Y - offset.Y));
graph.SetSize(node, originalSize.ToYDimension());
if (EdgeRoutingMode == RoutingMode.NoRouting)
{
// NoRouting still needs fix for self-loops
foreach (var edge in node.Edges)
{
if (edge.SelfLoop)
{
FixPorts(graph, edge, path, false);
FixPorts(graph, edge, path, true);
}
}
continue;
}
if (EdgeRoutingMode != RoutingMode.ShortestStraightPathToBorder)
{
continue;
}
// enlarge the adjacent segment to the oriented rectangle (represented by the path)
// handling in and out edges separately will automatically cause selfloops to be handled correctly
foreach (var edge in node.InEdges)
{
FixPorts(graph, edge, path, false);
}
foreach (var edge in node.OutEdges)
{
FixPorts(graph, edge, path, true);
}
}
} finally {
// if data provider for the port constraints have been added
// remove and dispose them
if (addedSourcePortConstraints)
{
graph.RemoveDataProvider(PortConstraintKeys.SourcePortConstraintDpKey);
graph.DisposeEdgeMap((IEdgeMap)sourcePortConstraints);
}
if (addedTargetPortContstraints)
{
graph.RemoveDataProvider(PortConstraintKeys.TargetPortConstraintDpKey);
graph.DisposeEdgeMap((IEdgeMap)targetPortConstraints);
}
}
}