private bool FindRoot()
{
HashSet <Representation.node> visitedLeaves = new HashSet <Representation.node>();
Representation.designGraph copiedgraph = graph.copy();
bool istree = true;
while (istree == true && copiedgraph.nodes.Count > 1)
{
istree = false;
for (var i = 0; i < copiedgraph.nodes.Count; i++)
{
if (copiedgraph.nodes[i].arcsFrom.Count == 0)
{
for (var j = 0; (i < copiedgraph.nodes.Count) && (j < copiedgraph.nodes[i].arcsTo.Count); j++)
{
string removedname = copiedgraph.nodes[i].arcsTo[j].To.name;
copiedgraph.removeNode(copiedgraph.nodes[i].arcsTo[j].To, false);
for (var l = 0; l < copiedgraph.arcs.Count; l++)
{
if (copiedgraph.arcs[l].To != null)
{
if (copiedgraph.arcs[l].To.name == removedname)
{
copiedgraph.removeArc(copiedgraph.arcs[l]);
}
}
}
istree = true;
}
break;
}
}
}
if (istree == false)
{
throw new Exception("This graph layout can only be run on trees.");
//return false;
}
var k = 0;
for (k = 0; copiedgraph.nodes[0].name != graph.nodes[k].name; k++)
{
}
root = k;
return(true);
}
protected static void NormalizePositions(Representation.designGraph graph)
{
if (graph.arcs.Count == 0 || graph.nodes.Count == 0)
{
return;
}
//get the topLeft position
var topLeft = new Point(float.PositiveInfinity, float.PositiveInfinity);
foreach (var n in graph.nodes)
{
topLeft.X = Math.Min(topLeft.X, n.X);
topLeft.Y = Math.Min(topLeft.Y, n.Y);
}
//translate with the topLeft position
foreach (var n in graph.nodes)
{
n.X -= topLeft.X;
n.Y -= topLeft.Y;
}
}
protected override bool RunLayout()
{
HashSet <Representation.node> visitedLeaves = new HashSet <Representation.node>();
Representation.designGraph copiedgraph = graph.copy();
bool istree = true;
while (istree == true && copiedgraph.nodes.Count > 1)
{
backgroundWorker.ReportProgress(100 - copiedgraph.nodes.Count);
if (backgroundWorker.CancellationPending)
{
return(false);
}
istree = false;
for (var i = 0; i < copiedgraph.nodes.Count; i++)
{
if (copiedgraph.nodes[i].arcsFrom.Count == 0)
{
for (var j = 0; (i < copiedgraph.nodes.Count) && (j < copiedgraph.nodes[i].arcsTo.Count); j++)
{
string removedname = copiedgraph.nodes[i].arcsTo[j].To.name;
copiedgraph.removeNode(copiedgraph.nodes[i], false);
for (var l = 0; l < copiedgraph.arcs.Count; l++)
{
if (copiedgraph.arcs[l].To != null)
{
if (copiedgraph.arcs[l].To.name == removedname)
{
copiedgraph.removeArc(copiedgraph.arcs[l]);
}
}
}
istree = true;
}
break;
}
}
}
if (istree == false)
{
backgroundWorker.ReportProgress(100);
throw new Exception("The input graph is not a tree. This layout only works on tree structures.");
}
//return;
var k = 0;
var x_dist = 0;
for (k = 0; k < copiedgraph.nodes.Count; k++)
{
for (var l = 0; l < graph.nodes.Count; l++)
{
if (copiedgraph.nodes[k].name == graph.nodes[l].name)
{
graph.nodes[l].X = x_dist;
graph.nodes[l].Y = 0;
outputchild(graph.nodes[l], x_dist, 0);
x_dist = x_dist + (int)HorizontalSpacing;
break;
}
}
}
return(true);
}