public bool Arrange(IGraph graph,
GridLayoutInfo info, LayoutProgress progress)
{
_graph = new Graph(graph);
_info = info;
if (_info.RndSeed != 0)
{
// Use the randomization seed supplied by the user
_random = new Random(_info.RndSeed);
}
Path path = null;
// Find the longest path between the start and the end node
if (_info.StartNode != null && _info.EndNode != null)
{
path = PathFinder.FindLongestPath(graph, _info.StartNode, _info.EndNode);
}
else
{
path = PathFinder.FindLongestPath(graph);
}
if (path == null)
return false;
// Build path consisting of the corresponding GraphNode-s
_backbone = new ArrayList();
foreach (INode inode in path.Nodes)
{
foreach (GraphNode node in _graph.Nodes)
{
if (node.Node == inode)
{
_backbone.Add(node);
break;
}
}
}
GraphNode[,] bestGrid = InitGrid();
float bestEstimation = float.MaxValue;
int maxShift = Math.Max(4, _gridWidth / 10);
// Update progress
int current = 0;
int total = CountIterations(maxShift);
float ffactor = total / 100;
int factor = 1;
if (ffactor > 1)
{
factor = (int)Math.Floor((double)ffactor);
total = total / factor + 1;
}
if (progress != null)
progress(current, total);
while (maxShift > 0)
{
for (int iter = 0;
iter < (maxShift > 2 ?
_info.Iterations :
(_info.Iterations / 5 * maxShift * _graph.Nodes.Count));
++iter)
{
// Update progress
if (progress != null)
{
if (current % factor == 0)
progress(current / factor, total);
current++;
}
GraphNode[,] grid = ScrambleGrid(bestGrid, maxShift, iter);
float estimation = EvaluateGrid(grid, maxShift);
if (estimation < bestEstimation)
{
bestEstimation = estimation;
bestGrid = grid;
}
else
{
ApplyGrid(bestGrid);
}
}
maxShift--;
}
PlaceObjects(bestGrid);
// Update progress
if (progress != null)
progress(total, total);
return true;
}
/// <summary>
/// Performs the arrangement of the diagram.
/// </summary>
public bool Arrange(IGraph graph,
LayeredLayoutInfo info, LayoutProgress progress)
{
_graph = new Graph(graph);
_info = info;
_progress = progress;
_current = 0;
_total =
1 /*path finding*/ +
1 /*layers splitting*/ +
1 /*dummify*/ +
6 /*minimize crossings*/ +
4 /*swap pairs*/ +
1 /*layout*/ +
1 /*apply*/ +
1 /*compact*/ +
1 /*dedumify*/;
// Update progress
if (_progress != null)
_progress(_current, _total);
// Initialize nodes
foreach (GraphNode node in _graph.Nodes)
{
node.SetData(_Layer, -1);
node.SetData(_UBaryCenter, 0.0);
node.SetData(_DBaryCenter, 0.0);
node.SetData(_ULinkCount, 0);
node.SetData(_DLinkCount, 0);
node.SetData(_UPriority, 0);
node.SetData(_DPriority, 0);
node.SetData(_GridPosition, 0);
node.SetData(_Dummy, false);
}
// Initialize links
foreach (GraphLink link in _graph.Links)
{
link.SetData(_DummificationLevel, 0);
}
// Determine the layer depth
Path longestPath = PathFinder.FindLongestPath(graph, info.TimeLimit);
if (longestPath == null)
return true; // No objects in the graph
// Update progress
if (_progress != null)
_progress(_current++, _total);
_layers = new ArrayList();
for (int i = 0; i < longestPath.Nodes.Count; i++)
_layers.Add(new ArrayList());
// Distribute nodes to their appropriate layers,
// starting with the nodes from the longest path
for (int i = 0; i < longestPath.Nodes.Count; i++)
{
// Find the corresponding node in the internal graph
GraphNode node = null;
foreach (GraphNode n in _graph.Nodes)
{
if (n.Node == longestPath.Nodes[i])
{
node = n;
break;
}
}
node.SetData(_Layer, i);
(_layers[i] as ArrayList).Add(node);
}
foreach (INode node in longestPath.Nodes)
{
// Find the corresponding node in the internal graph
GraphNode gnode = null;
foreach (GraphNode n in _graph.Nodes)
{
if (n.Node == node)
{
gnode = n;
break;
}
}
AddChildren(gnode);
}
// For all layers whose nodes are > 1 / 20 of the total ->
// drop nodes. This will ensure that there are no
// too wide layers, thus improving visibility of the graph.
int total = 0;
bool found;
foreach (ArrayList layer in _layers)
total += layer.Count;
int threshold = total / 10;
if (total > 50 && _info.SplitLayers)
{
found = true;
while (found)
{
found = false;
foreach (ArrayList layer in _layers)
{
if (layer.Count > threshold)
{
// Find candidates for dropping.
// Good candidate is a node which
// when moved downwards will be closer
// to its children
SortedList candidates = new SortedList();
foreach (GraphNode node in layer)
{
// Calculate total child depth
int factor = 0;
int nodeLayer = (int)node.GetData(_Layer);
foreach (GraphLink link in node.OutLinks)
{
int childLayer = (int)link.Destination.GetData(_Layer);
if (childLayer <= nodeLayer)
factor += 1;
else
factor -= 1;
}
foreach (GraphLink link in node.InLinks)
{
int childLayer = (int)link.Origin.GetData(_Layer);
if (childLayer <= nodeLayer)
factor += 1;
else
factor -= 1;
}
if (factor > 0)
candidates[factor] = node;
}
if (candidates.Keys.Count == 0)
continue;
found = true;
ArrayList nextLayer = null;
int ilayer = _layers.IndexOf(layer);
if (ilayer == _layers.Count - 1)
{
nextLayer = new ArrayList();
_layers.Add(nextLayer);
}
else
{
nextLayer = _layers[ilayer + 1] as ArrayList;
}
while (layer.Count > threshold)
{
if (candidates.Keys.Count == 0)
break;
GraphNode node = candidates.GetByIndex(candidates.Count - 1) as GraphNode;
candidates.RemoveAt(candidates.Count - 1);
nextLayer.Add(node);
layer.Remove(node);
node.SetData(_Layer, (int)node.GetData(_Layer) + 1);
}
}
if (found)
break;
}
}
}
// Check if there are directly related nodes on the same layer
found = true;
while (found)
{
found = false;
int ilayer = 0;
ArrayList nodesToDrop = new ArrayList();
foreach (ArrayList layer in _layers)
{
nodesToDrop.Clear();
foreach (GraphNode node in layer)
{
foreach (GraphLink link in node.OutLinks)
{
if ((int)link.Destination.GetData(_Layer) == ilayer)
{
// The node's child is on the same layer.
// Mark it for dropping
if (!nodesToDrop.Contains(link.Destination))
nodesToDrop.Add(link.Destination);
found = true;
}
}
}
// Drop nodes downwards
if (found)
{
ArrayList curLayer = _layers[ilayer] as ArrayList;
ArrayList nextLayer = null;
if (ilayer == _layers.Count - 1)
{
nextLayer = new ArrayList();
_layers.Add(nextLayer);
}
else
{
nextLayer = _layers[ilayer + 1] as ArrayList;
}
foreach (GraphNode node in nodesToDrop)
{
if (curLayer.Count > 1)
{
nextLayer.Add(node);
curLayer.Remove(node);
node.SetData(_Layer, (int)node.GetData(_Layer) + 1);
}
}
break;
}
ilayer++;
}
}
// Calculate initial grid positions
foreach (ArrayList layer in _layers)
for (int i = 0; i < layer.Count; i++)
(layer[i] as GraphNode).SetData(_GridPosition, (double)i);
// Update progress
if (_progress != null)
_progress(_current++, _total);
// Add dummy nodes for all links which cross one or more
// layers. Add one dummy node for each crossed layer
Dummify();
// Reduce crossings
MinimizeCrossings();
// Further reduce crossings through pair swap
SwapPairs();
// Arrange nodes
Layout();
// Update progress
if (_progress != null)
_progress(_current++, _total);
// Compact levels
if (_info.ArrowsCompactFactor != 1)
Compact();
// Update progress
if (_progress != null)
_progress(_current++, _total);
Apply();
// Update progress
if (_progress != null)
_progress(_current++, _total);
// Reverse dummification
Dedummify();
// Update progress
if (_progress != null)
_progress(_total, _total);
// Update nodes positions
foreach (GraphNode node in _graph.Nodes)
if (node.Node != null)
node.Node.Bounds = node.Bounds;
// Update arrow points
foreach (GraphLink link in _graph.Links)
{
if (link.Link != null)
{
object points = link.GetData(_LinkPoints);
if (points != null)
link.Link.SetPoints(points as ArrayList);
}
}
return true;
}
public bool Arrange(IGraph graph,
SpringLayoutInfo layoutInfo, LayoutProgress progress)
{
_info = layoutInfo;
if (_info.RndSeed != 0)
{
// Use the randomization seed supplied by the user
_r = new Random(_info.RndSeed);
}
// Build the internal graph
_graph = new Graph(graph);
RectangleF rcDoc = CalcContentRect(_graph);
float minNodeX = rcDoc.Left - (50f * _info.NodeDistance);
float minNodeY = rcDoc.Top - (50f * _info.NodeDistance);
float maxNodeX = rcDoc.Right + (50f * _info.NodeDistance);
float maxNodeY = rcDoc.Bottom + (50f * _info.NodeDistance);
// Initialize
foreach (GraphNode node in _graph.Nodes)
node.SetData(_SpringVertex, new SpringVertexData());
foreach (GraphLink link in _graph.Links)
link.SetData(_SpringEdge, new SpringEdgeData());
// Calculate vertex radiuses
foreach (GraphNode node in _graph.Nodes)
{
RectangleF rc = node.Bounds;
node.SetData(_VertexRadius,
(double)(rc.Width + rc.Height) / 4);
}
// Update progress
int total = layoutInfo.IterationCount;
float ffactor = total / 100;
int factor = 1;
if (ffactor > 1)
{
factor = (int)Math.Floor((double)ffactor);
total = total / factor + 1;
}
if (progress != null)
progress(0, total);
// An iterative layout algorithm
for(int step = 1; step <= layoutInfo.IterationCount; step++)
{
// Update progress
if (progress != null)
{
if (step % factor == 0)
progress(step / factor, total);
}
foreach(GraphNode node in _graph.Nodes)
{
SpringVertexData data = (SpringVertexData)
node.GetData(_SpringVertex);
data.DX /= 4;
data.DY /= 4;
data.EdgeDX = data.EdgeDY = 0;
data.RepulsionDX = data.RepulsionDY = 0;
}
// here the "springs" confine nodes to the desired node distance
foreach (GraphLink link in _graph.Links)
{
// get incident nodes
GraphNode v1 = link.Origin;
GraphNode v2 = link.Destination;
// compute current distance between nodes
PointF v1Pos = v1.Center;
PointF v2Pos = v2.Center;
double vx = v1Pos.X - v2Pos.X;
double vy = v1Pos.Y - v2Pos.Y;
double dist = Math.Sqrt(vx * vx + vy * vy);
dist = (dist == 0) ? 0.0001 : dist;
// get desired distance accomodated for node extents
double desiredDist = _info.NodeDistance;
desiredDist += ((double)v1.GetData(_VertexRadius) +
(double)v2.GetData(_VertexRadius)) / 2;
// now handling cluster center nodes ?
bool masterNodes = _info.EnableClusters &&
(v1.LinkCount > 4 && v2.LinkCount > 4);
desiredDist *= masterNodes ? 4 : link.Link.Weight;
// force factor: optimal length minus actual length,
// is made smaller as the current actual length gets larger.
double f = _ForceConstant * (desiredDist - dist) / dist;
// nodes with few links are moved easier than ones with more
double f1 = masterNodes ? f :
(f * Math.Pow(_stretch / 100.0, v1.LinkCount - 1));
double f2 = masterNodes ? f :
(f * Math.Pow(_stretch / 100.0, v2.LinkCount - 1));
// move first node towards the second one
SpringVertexData v1D = (SpringVertexData)v1.GetData(_SpringVertex);
v1D.EdgeDX += f1 * vx;
v1D.EdgeDY += f1 * vy;
// move second node towards the first one
SpringVertexData v2D = (SpringVertexData)v2.GetData(_SpringVertex);
v2D.EdgeDX += -f2 * vx;
v2D.EdgeDY += -f2 * vy;
}
// here nodes tend to run away one from another
foreach (GraphNode node in _graph.Nodes)
{
SpringVertexData svd = (SpringVertexData)node.GetData(_SpringVertex);
double dx = 0;
double dy = 0;
foreach (GraphNode node2 in _graph.Nodes)
{
if (node2 == node)
continue;
// now handling cluster center nodes ?
bool masterNodes = _info.EnableClusters &&
(node.LinkCount > 4 && node2.LinkCount > 4);
// if distance is longer than this, ignore repulsion
double intrZone = _info.NodeDistance *
(masterNodes ? 4.5 : _info.RepulsionFactor);
// if distance is shorter than this, randomize node positions
double tooClose = _info.NodeDistance / (masterNodes ? 1 : 5);
// distance to move when using random position
double moveRange = _info.NodeDistance * (masterNodes ? 5 : 1);
// compute current distance between nodes
double vx = node.Center.X - node2.Center.X;
double vy = node.Center.Y - node2.Center.Y;
double distance = vx * vx + vy * vy;
// kind of simmulated annealing, use random jumps for nodes
// that are close one to another; longer jumps for nodes that
// overlap completely and shorter for nodes that don't overlap
if (distance == 0)
{
dx += moveRange/2 + _r.Next() % ((int)(moveRange * 3));
dy += moveRange/2 + _r.Next() % ((int)(moveRange * 3));
if (_r.Next() % 2 == 1) dx = -dx;
if (_r.Next() % 2 == 1) dy = -dy;
}
else if (distance < tooClose * tooClose)
{
dx += moveRange/2 + _r.Next((int)moveRange);
dy += moveRange/2 + _r.Next((int)moveRange);
if (_r.Next() % 2 == 1) dx = -dx;
if (_r.Next() % 2 == 1) dy = -dy;
}
// if nodes are not that close, calculate normal repulsion
else if (distance < intrZone * intrZone)
{
float mf = masterNodes ?
(node.LinkCount + node2.LinkCount) : 1;
dx += mf * vx / (distance * distance);
dy += mf * vy / (distance * distance);
}
}
// apply the summary repulsion of this node with all other nodes
double dlen = dx * dx + dy * dy;
if (dlen > 0)
{
dlen = Math.Sqrt(dlen) / 2;
svd.RepulsionDX += dx / dlen;
svd.RepulsionDY += dy / dlen;
}
}
// sum repulsion and "spring" forces and move nodes
foreach(GraphNode node in _graph.Nodes)
{
// update node movement speed
SpringVertexData vd =
(SpringVertexData)node.GetData(_SpringVertex);
vd.DX += vd.RepulsionDX + vd.EdgeDX;
vd.DY += vd.RepulsionDY + vd.EdgeDY;
// move node
PointF xyd = node.Center;
xyd.X += (float)vd.DX;
xyd.Y += (float)vd.DY;
if (layoutInfo.EnableClusters &&
(((xyd.X < minNodeX) || (xyd.Y < minNodeY)) || ((xyd.X > maxNodeX) || (xyd.Y > maxNodeY))))
{
xyd = node.Center;
vd.DX /= 4;
vd.DY /= 4;
}
node.Center = xyd;
}
// try to decrease crossings if that option is enabled
if (_info.MinimizeCrossings &&
(step % 10 == 0) &&
(step < _info.IterationCount * 2 / 3))
{
int currentCrossings = CountCrossings();
if (currentCrossings > 0)
TryDecreaseCrossings(graph.DocRect, _info.NodeDistance, currentCrossings);
}
}
// offset the graph to its original location
RectangleF rcDoc2 = CalcContentRect(_graph);
float pdx = rcDoc2.Left - rcDoc.Left;
float pdy = rcDoc2.Top - rcDoc.Top;
foreach(GraphNode node in _graph.Nodes)
{
PointF xyd = node.Center;
xyd.X -= pdx;
xyd.Y -= pdy;
node.Center = xyd;
}
// update flowchart nodes positions
foreach(GraphNode node in _graph.Nodes)
node.Node.Bounds = node.Bounds;
// call progress delegate
if (progress != null)
progress(total, total);
return true;
}
public bool Arrange(IGraph graph, AnnealLayoutInfo info, LayoutProgress progress)
{
_tempGraph = new Graph(graph);
_info = info;
float nsize = 0;
foreach (INode node in graph.Nodes)
nsize += node.Bounds.Width;
averageNodeSize = nsize / graph.Nodes.Count;
// determine what the graph boundaries should be
if (info.LayoutArea != RectangleF.Empty)
{
_drawingArea = info.LayoutArea;
}
else
{
double squareSize = averageNodeSize * Math.Ceiling(Math.Sqrt(graph.Nodes.Count));
double width = squareSize * info.WidthHeightRatio;
double height = squareSize / info.WidthHeightRatio;
_drawingArea = new RectangleF(0, 0, (float)width * 4.5f, (float)height * 4.5f);
}
// start with random positions
if (info.Randomize)
{
Random rnd = new Random();
foreach (GraphNode node in _tempGraph.Nodes)
{
node.Center = new PointF(
_drawingArea.Left + (float)rnd.NextDouble() * _drawingArea.Width,
_drawingArea.Top + (float)rnd.NextDouble() * _drawingArea.Height);
}
}
if (progress != null)
progress(0, _info.Stages + 2);
SetGraphElements();
SetInitStep();
CalculateInitialState();
_temperature = _info.Temperature;
double totalCost = CostFunction();
double previousCost;
double stopIterCond;
Random rand = new Random();
// cool down for the specified number of annealing stages
for (int stage = 0; stage < _info.Stages; stage++)
{
for (int iter = 0; iter < _info.IterationsPerStage; iter++)
{
previousCost = totalCost;
for (int n = 0; n < _tempGraph.Nodes.Count; n++)
{
double oldNodeCost = evalCost(_nodes[n]);
foreach (int i in Enum.GetValues(typeof(ShiftTo)))
{
ShiftNode(_nodes[n], (ShiftTo)i, false);
if (!nodeInBounds(_nodes[n]))
{
ShiftNode(_nodes[n], (ShiftTo)i, true);
continue;
}
double newNodeCost = evalCost(_nodes[n]);
double newTotalCost = totalCost - oldNodeCost + newNodeCost;
if (newNodeCost < oldNodeCost ||
Math.Pow(Math.E, (totalCost - newTotalCost) / _temperature) > rand.NextDouble())
{
totalCost = newTotalCost;
CommitMove(_nodes[n]);
break;
}
else
{
ShiftNode(_nodes[n], (ShiftTo)i, true);
RollbackMove(_nodes[n]);
}
}
}
stopIterCond = previousCost / totalCost;
if (stopIterCond > .98 && stopIterCond <= 1)
break;
}
SetTemperature();
DecreaseMoveValue();
if (progress != null)
progress(stage + 1, _info.Stages + 2);
}
FineTuning();
if (progress != null)
progress(_info.Stages + 2, _info.Stages + 2);
foreach (GraphNode node in _tempGraph.Nodes)
node.Node.Bounds = node.Bounds;
return true;
}
private RectangleF CalcContentRect(Graph graph)
{
RectangleF res = RectangleF.Empty;
foreach(GraphNode node in graph.Nodes)
{
if(res == RectangleF.Empty)
res = node.Bounds;
else
res = Utilities.UnionRects(res, node.Bounds);
}
return res;
}
