//*************************************************************************
// Method: getConnectivityBetween()
//
/// <summary>
/// Get whether there is connectivity between two groups in a graph.
/// </summary>
///
/// <param name="g1">
/// Group 1
/// </param>
///
/// <param name="g2">
/// Group 2
/// </param>
///
/// <param name="oGraph">
/// The graph these groups are in
/// </param>
///
/// <returns>
/// True if there is connectivity, false otherwise.
/// </returns>
//*************************************************************************
public bool getConnectivityBetween(GroupInfo g1, GroupInfo g2, IGraph oGraph)
{
IntergroupEdgeCalculator m_oIntergroupEdgeCalculator = new IntergroupEdgeCalculator();
// Currently uses undirected graph
IList<IntergroupEdgeInfo> oIntergroupEdges =
m_oIntergroupEdgeCalculator.CalculateGraphMetrics(oGraph,
new GroupInfo[] { g1, g2 }, false);
foreach (IntergroupEdgeInfo e in oIntergroupEdges)
{
if (e.Group1Index == 0 && e.Group2Index == 1)
{
return e.Edges > 0;
}
}
return false;
}
CreateGraph
(
Boolean bIsDirected
)
{
m_oIntergroupEdgeCalculator = new IntergroupEdgeCalculator();
m_oGraph = new Graph(bIsDirected ?
GraphDirectedness.Directed : GraphDirectedness.Undirected);
m_oVertices = m_oGraph.Vertices;
m_oEdges = m_oGraph.Edges;
}
LayOutGraphUsingForceDirectedGroups
(
IGraph oGraph,
List<GroupInfo> oGroupsToLayout,
LayoutContext oAdjustedLayoutContext,
BackgroundWorker oBackgroundWorker
)
{
Debug.Assert(oGraph != null);
Debug.Assert(oAdjustedLayoutContext != null);
/////////////////////////////////////////////////////
// Get the initial position for the group vertices //
/////////////////////////////////////////////////////
// Determine how much of the screen to use for groups
Single areaPerVertex = (Single)GroupRectangleCalculator.GetAreaPerVertex(oAdjustedLayoutContext.GraphRectangle, oGroupsToLayout);
areaPerVertex /= 2f; // Customise this value if necessary to have more whitespace between groups -- expose as a user control?
// Create a graph for the groups
Graph groupInitialGraph = new Graph(GraphDirectedness.Undirected);
// Convert GroupInfos into vertices that can be laid out
//IEnumerable<GroupVertex> groupInitialGraphVertices = groupsToLayOut.Select<GroupInfo, GroupVertex>(g => new GroupVertex(g, groupInitialGraph));
List<GroupVertex> groupInitialGraphVertices = new List<GroupVertex>();
foreach (GroupInfo groupInfo in oGroupsToLayout)
{
GroupVertex groupVertex = new GroupVertex(groupInfo, areaPerVertex);
groupInitialGraphVertices.Add(groupVertex);
groupInitialGraph.Vertices.Add(groupVertex);
}
Int32 iGroups = oGroupsToLayout.Count;
// Add edges between groups
IVertexCollection oVertices = groupInitialGraph.Vertices;
IEdgeCollection oEdges = groupInitialGraph.Edges;
IList<IntergroupEdgeInfo> intergroupEdgeInfos = new IntergroupEdgeCalculator().CalculateGraphMetrics(oGraph, oGroupsToLayout, false);
foreach (IntergroupEdgeInfo interGroupEdgeInfo in intergroupEdgeInfos)
{
IVertex groupVertex1 = oVertices.ElementAt<IVertex>(interGroupEdgeInfo.Group1Index);
IVertex groupVertex2 = oVertices.ElementAt<IVertex>(interGroupEdgeInfo.Group2Index);
if (groupVertex1 != groupVertex2)
{
oEdges.Add(groupVertex1, groupVertex2, false);
}
}
// Use Harel-Koren to compute initial group positions, stored in groupVertex.Location
ILayout oLayout = new HarelKorenFastMultiscaleLayout();
oLayout.LayOutGraph(groupInitialGraph, oAdjustedLayoutContext);
foreach (GroupVertex groupVertex in groupInitialGraph.Vertices)
{
// If we have too few groups, automatically push them into the AdjustedLayoutContext
if (groupInitialGraph.Vertices.Count <= 3)
{
groupVertex.updateGroupInfoRectangleFromLocation();
groupVertex.groupInfo.Rectangle = GraphicsUtil.RectangleFToRectangle(GraphicsUtil.MoveRectangleWithinBounds(groupVertex.groupInfo.Rectangle, oAdjustedLayoutContext.GraphRectangle, false), 1);
RectangleF r = groupVertex.groupInfo.Rectangle;
groupVertex.Location = new PointF(r.X + r.Width / 2, r.Y + r.Height / 2);
}
// Update the meta-node locations
groupVertex.updateGroupInfoLocationFromLocation();
}
/////////////////////////
// Remove node overlap //
/////////////////////////
// while ( overlaps exist along proximity graph edges )
// {
// Create proximity graph (delaunay triangulation)
// Minimize proxmity graph overlap stress function
// }
//
// while ( any overlaps exist )
// {
// Create proximity graph (delaunay triangulation)
// Find overlaps (scan-line alg)
// Augment proximity graph with edges for overlaps
// Minimize proxmity graph overlap stress function
// }
Boolean initialOverlapInProximityGraph;
Int32 iteration = 0;
Graph lastGraphAfterFirstPhase = groupInitialGraph;
do
{
Graph groupProximityGraph = createGroupVertexProximityGraph(lastGraphAfterFirstPhase);
lastGraphAfterFirstPhase = groupProximityGraph;
initialOverlapInProximityGraph = proximityGraphStressMajorization(groupProximityGraph, 1000);
iteration++;
} while (initialOverlapInProximityGraph == true);
///////////////////////////////////////////////////////////////////
// Transform the layout to get the boxes within the LayoutContext//
///////////////////////////////////////////////////////////////////
Rectangle boundingRectangle = oAdjustedLayoutContext.GraphRectangle;
Int32 overallLeftOffset = Int32.MinValue;
Int32 overallTopOffset = Int32.MinValue;
Int32 overallRightOffset = Int32.MinValue;
Int32 overallBottomOffset = Int32.MinValue;
foreach (GroupInfo groupInfo in oGroupsToLayout)
{
Rectangle groupRectangle = groupInfo.Rectangle;
Int32 rectangleLeftOffset = boundingRectangle.Left - groupRectangle.Left;
if (rectangleLeftOffset > overallLeftOffset)
{
overallLeftOffset = rectangleLeftOffset;
}
Int32 rectangleTopOffset = boundingRectangle.Top - groupRectangle.Top;
if (rectangleTopOffset > overallTopOffset)
{
overallTopOffset = rectangleTopOffset;
}
Int32 rectangleRightOffset = groupRectangle.Right - boundingRectangle.Right;
if (rectangleRightOffset > overallRightOffset)
{
overallRightOffset = rectangleRightOffset;
}
Int32 rectangleBottomOffset = groupRectangle.Bottom - boundingRectangle.Bottom;
if (rectangleBottomOffset > overallBottomOffset)
{
overallBottomOffset = rectangleBottomOffset;
}
}
Rectangle newBoundingRectangle = new Rectangle(
boundingRectangle.X - overallLeftOffset, boundingRectangle.Y - overallTopOffset,
boundingRectangle.Width + overallLeftOffset + overallRightOffset, boundingRectangle.Height + overallTopOffset + overallBottomOffset);
// Perform metadata-related tasks.
GroupMetadataManager.OnLayoutUsingGroupsEnd(lastGraphAfterFirstPhase, oGroupsToLayout,
this.GroupRectanglePenWidth, this.IntergroupEdgeStyle);
lastGraphAfterFirstPhase.SetValue(ReservedMetadataKeys.GroupLayoutDrawingInfo,
new GroupLayoutDrawingInfo(oGroupsToLayout, this.GroupRectanglePenWidth, null));
//TransformLayout(oGraph, new LayoutContext(newBoundingRectangle), oAdjustedLayoutContext);
TransformLayout(lastGraphAfterFirstPhase, new LayoutContext(newBoundingRectangle), oAdjustedLayoutContext);
///////////////////////////////////
// Finish with individual groups //
///////////////////////////////////
for (Int32 i = 0; i < iGroups; i++)
{
GroupInfo oGroupInfo = oGroupsToLayout[i];
Rectangle oGroupRectangle = oGroupInfo.Rectangle;
oGroupRectangle.Inflate(-m_iMargin, -m_iMargin);
// Do not use Rectangle.IsEmpty() here. It returns true only if
// the rectangle is at the origin and has zero width and height.
if (oGroupRectangle.Width > 0 && oGroupRectangle.Height > 0)
{
ICollection<IVertex> oVerticesInGroup = oGroupInfo.Vertices;
if ( !GetLayoutToUseForGroup(oGraph, oVerticesInGroup).
LayOutGraphCore(oGraph, oVerticesInGroup,
new LayoutContext(oGroupRectangle), oBackgroundWorker)
)
{
// LayOutGraphAsyncCancel() was called.
return (false);
}
}
else
{
oGroupRectangle = oGroupInfo.Rectangle;
PointF oVertexLocation;
if (oGroupRectangle.Width > 0 && oGroupRectangle.Height > 0)
{
// Put the group's vertices at the rectangle's center.
oVertexLocation = new PointF(
oGroupRectangle.Left + oGroupRectangle.Width / 2,
oGroupRectangle.Top + oGroupRectangle.Height / 2
);
}
else
{
// Put the group's vertices at the rectangle's upper-left
// corner.
oVertexLocation = new PointF(
oGroupRectangle.X, oGroupRectangle.Y
);
}
foreach (IVertex oVertex in oGroupInfo.Vertices)
{
oVertex.Location = oVertexLocation;
}
}
}
// Perform metadata-related tasks.
GroupMetadataManager.OnLayoutUsingGroupsEnd(oGraph, oGroupsToLayout,
this.GroupRectanglePenWidth, this.IntergroupEdgeStyle);
return (true);
}
