/// <summary>
/// Executes the fast organic layout.
/// </summary>
/// <param name="parent"></param>
public void execute(Object parent)
{
mxIGraphModel model = graph.Model;
// Finds the relevant vertices for the layout
int childCount = model.GetChildCount(parent);
List <Object> tmp = new List <Object>(childCount);
for (int i = 0; i < childCount; i++)
{
Object child = model.GetChildAt(parent, i);
if (!IsCellIgnored(child))
{
tmp.Add(child);
}
}
vertexArray = tmp.ToArray();
int n = vertexArray.Length;
dispX = new double[n];
dispY = new double[n];
cellLocation = new double[n][];
isMoveable = new bool[n];
neighbours = new int[n][];
radius = new double[n];
radiusSquared = new double[n];
minDistanceLimitSquared = minDistanceLimit * minDistanceLimit;
if (forceConstant < 0.001)
{
forceConstant = 0.001;
}
forceConstantSquared = forceConstant * forceConstant;
// Create a map of vertices first. This is required for the array of
// arrays called neighbours which holds, for each vertex, a list of
// ints which represents the neighbours cells to that vertex as
// the indices into vertexArray
for (int i = 0; i < vertexArray.Length; i++)
{
Object vertex = vertexArray[i];
cellLocation[i] = new double[2];
// Set up the mapping from array indices to cells
indices[vertex] = i;
mxGeometry bounds = model.GetGeometry(vertex);
// Set the X,Y value of the internal version of the cell to
// the center point of the vertex for better positioning
double width = bounds.Width;
double height = bounds.Height;
// Randomize (0, 0) locations
double x = bounds.X;
double y = bounds.Y;
cellLocation[i][0] = x + width / 2.0;
cellLocation[i][1] = y + height / 2.0;
radius[i] = Math.Min(width, height);
radiusSquared[i] = radius[i] * radius[i];
}
for (int i = 0; i < n; i++)
{
dispX[i] = 0;
dispY[i] = 0;
isMoveable[i] = graph.IsCellMovable(vertexArray[i]);
// Get lists of neighbours to all vertices, translate the cells
// obtained in indices into vertexArray and store as an array
// against the orginial cell index
Object[] edges = mxGraphModel.GetEdges(model, vertexArray[i]);
Object[] cells = mxGraphModel.GetOpposites(model, edges,
vertexArray[i], true, true);
neighbours[i] = new int[cells.Length];
for (int j = 0; j < cells.Length; j++)
{
int?index = indices[cells[j]];
// Check the connected cell in part of the vertex list to be
// acted on by this layout
if (index != null)
{
neighbours[i][j] = (int)index;
}
// Else if index of the other cell doesn't correspond to
// any cell listed to be acted upon in this layout. Set
// the index to the value of this vertex (a dummy self-loop)
// so the attraction force of the edge is not calculated
else
{
neighbours[i][j] = i;
}
}
}
temperature = initialTemp;
// If max number of iterations has not been set, guess it
if (maxIterations == 0)
{
maxIterations = (int)(20 * Math.Sqrt(n));
}
// Main iteration loop
for (iteration = 0; iteration < maxIterations; iteration++)
{
if (!allowedToRun)
{
return;
}
// Calculate repulsive forces on all vertices
calcRepulsion();
// Calculate attractive forces through edges
calcAttraction();
calcPositions();
reduceTemperature();
}
// Moved cell location back to top-left from center locations used in
// algorithm
model.BeginUpdate();
try
{
double?minx = null;
double?miny = null;
for (int i = 0; i < vertexArray.Length; i++)
{
Object vertex = vertexArray[i];
mxGeometry geo = model.GetGeometry(vertex);
if (geo != null)
{
cellLocation[i][0] -= geo.Width / 2.0;
cellLocation[i][1] -= geo.Height / 2.0;
geo = geo.Clone();
geo.X = graph.Snap(cellLocation[i][0]);
geo.Y = graph.Snap(cellLocation[i][1]);
model.SetGeometry(vertex, geo);
if (minx == null)
{
minx = geo.X;
}
else
{
minx = Math.Min((double)minx, geo.X);
}
if (miny == null)
{
miny = geo.Y;
}
else
{
miny = Math.Min((double)miny, geo.Y);
}
}
}
// Modifies the cloned geometries in-place. Not needed
// to clone the geometries again as we're in the same
// undoable change.
if (minx != null || miny != null)
{
for (int i = 0; i < vertexArray.Length; i++)
{
Object vertex = vertexArray[i];
mxGeometry geo = model.GetGeometry(vertex);
if (geo != null)
{
if (minx != null)
{
geo.X -= ((double)minx) - 1;
}
if (miny != null)
{
geo.Y -= ((double)miny) - 1;
}
}
}
}
}
finally
{
model.EndUpdate();
}
}