public void AddNode(GraphNode node)
{
if (Nodes.Contains(node) || Nodes.Any(n => n.Label == node.Label))
throw new Exception();
Nodes.Add(node);
}
private void AddEdge(GraphNode src, GraphNode dest, string label)
{
if (!Nodes.Contains(src))
AddNode(src);
if (!Nodes.Contains(dest))
AddNode(dest);
src.Connect(dest, label);
}
internal void Disconnect(GraphNode fromNode)
{
ToNodes.Remove(fromNode);
}
internal void Connect(GraphNode toNode, string label)
{
ToNodes.Add(toNode, label);
}
public void AddEdge(GraphNode src, GraphNode dest)
{
AddEdge(src, dest, "");
}
private LineCoordinate CalculateEdgeCoordintes(GraphNode node1, GraphNode node2, int size)
{
double r = size / 2.0;
int x1 = node1.X, x2 = node2.X, y1 = node1.Y, y2 = node2.Y;
switch (EdgeConnectionStyle)
{
case EdgeConnectionStyle.FreeStyle:
int dx1 = (int)Math.Round(Math.Abs(x2 - x1) / Math.Sqrt(Math.Pow(x2 - x1, 2) + Math.Pow(y2 - y1, 2)) * r);
int dy1 = (int)Math.Round(Math.Abs(y2 - y1) / Math.Sqrt(Math.Pow(x2 - x1, 2) + Math.Pow(y2 - y1, 2)) * r);
if (node2.X > node1.X)
{
x1 += dx1;
x2 -= dx1;
}
else
{
x1 -= dx1;
x2 += dx1;
}
if (node2.Y > node1.Y)
{
y1 += dy1;
y2 -= dy1;
}
else
{
y1 -= dy1;
y2 += dy1;
}
break;
case EdgeConnectionStyle.TopBottom:
if (node2.Y > node1.Y)
{
y1 = (int)Math.Ceiling(y1 + r);
y2 = (int)Math.Ceiling(y2 - r);
}
else
{
y1 = (int)Math.Ceiling(y1 - r);
y2 = (int)Math.Ceiling(y2 + r);
}
break;
case EdgeConnectionStyle.LeftRight:
if (node2.X > node1.X)
{
x1 = (int)Math.Ceiling(x1 + r);
x2 = (int)Math.Ceiling(x2 - r);
}
else
{
x1 = (int)Math.Ceiling(x1 - r);
x2 = (int)Math.Ceiling(x2 + r) + 1;
}
break;
default:
throw new NotSupportedException();
}
return new LineCoordinate(x1, y1, x2, y2);
}
private void DrawSingleEdge(Graphics g, GraphNode node1, GraphNode node2, string label, int size)
{
var edge = CalculateEdgeCoordintes(node1, node2, size);
DrawEdge(g, label, edge.X1, edge.Y1, edge.X2, edge.Y2, size, false);
}
private void DrawDoubleEdge(Graphics g, GraphNode node1, GraphNode node2, string label1, string label2, int size)
{
// todo: incomplete implementation!
var edge = CalculateEdgeCoordintes(node1, node2, size);
DrawEdge(g, label1, edge.X1, edge.Y1, edge.X2, edge.Y2, size, true);
//var edge1 = CalculateEdgeCoordintes(node1, node2, size);
//var edge2 = CalculateEdgeCoordintes(node2, node1, size);
//var dx = 0.015 * size - 0.32;
//var dy = (edge1.X2 - edge1.X1) / (edge1.Y2 - edge1.Y1) * dx;
//edge1.X1 += (int) Math.Round(dx);
//edge1.Y1 += (int) Math.Round(dy);
//edge1.X2 += (int) Math.Round(dx);
//edge1.Y2 += (int) Math.Round(dy);
//edge2.X1 -= (int) Math.Round(dx);
//edge2.Y1 -= (int) Math.Round(dy);
//edge2.X2 -= (int) Math.Round(dx);
//edge2.Y2 -= (int) Math.Round(dy);
//DrawEdge(g, label1, edge1.X1, edge1.Y1, edge1.X2, edge1.Y2, size);
//DrawEdge(g, label2, edge2.X1, edge2.Y1, edge2.X2, edge2.Y2, size);
}
