public void AddPredecessor(NodeVisualization nv)
{
object[] args = { nv.Node };
Node.GetType().GetMethod("AddPredecessor").Invoke(Node, args);
nv.successors [this] = false;
predecessors[nv] = false;
}
public void RemoveNode(NodeVisualization node)
{
graph.GetType().GetMethod("RemoveNode").Invoke(graph, new[] { node.Node });
nodes.Remove(node);
Console.WriteLine("RemoveNode");
Console.WriteLine(graph.ToString());
}
public void RemovePredecessor(NodeVisualization nv)
{
object[] args = { nv.Node };
Node.GetType().GetMethod("RemovePredecessor").Invoke(Node, args);
nv.successors.Remove(this);
predecessors.Remove(nv);
}
public bool AddNode(NodeVisualization node)
{
List <string> names = nodes.Select(n => n.ToString()).ToList();
if (names.Contains(node.ToString()))
{
return(false);
}
graph.GetType().GetMethod("AddNode").Invoke(graph, new[] { node.Node });
nodes.Add(node);
return(true);
}
private void DrawEdge(Cairo.Context cx, NodeVisualization _from, NodeVisualization _to)
{
int beginX = _from.X + _from.Width / 2;
int beginY = _from.Y + _from.Height / 2;
int endX = _to.X + _to.Width / 2;
int endY = _to.Y + _to.Height / 2;
cx.Antialias = Antialias.Gray;
cx.LineWidth = 3;
if (!_from.successors.ContainsKey(_to) || _from.successors[_to] == false)
{
cx.SetSourceColor(new Color(0, 0, 0, 1));
}
else
{
cx.SetSourceColor(new Color(0, 0.8, 0, 1));
}
cx.LineCap = LineCap.Round;
cx.MoveTo(beginX, beginY);
cx.LineTo(endX, endY);
cx.Stroke();
int tipX = ((2 * endX) + beginX) / 3;
int tipY = ((2 * endY) + beginY) / 3;
int arrowLength = 10; //can be adjusted
int dx = endX - beginX;
int dy = endY - beginY;
double theta = Math.Atan2(dy, dx);
double rad = 35 * Math.PI / 180; //35 angle
double x = tipX - arrowLength * Math.Cos(theta + rad);
double y = tipY - arrowLength * Math.Sin(theta + rad);
double phi2 = -35 * Math.PI / 180; //-35 angle
double x2 = tipX - arrowLength * Math.Cos(theta + phi2);
double y2 = tipY - arrowLength * Math.Sin(theta + phi2);
cx.MoveTo(tipX, tipY);
cx.LineTo(x, y);
cx.Stroke();
cx.MoveTo(tipX, tipY);
cx.LineTo(x2, y2);
cx.Stroke();
}
public void StartRemoveConnection(NodeVisualization nv)
{
removeConnection = true;
predecessor = nv;
}
public void StartConnection(NodeVisualization nv)
{
makeConnection = true;
predecessor = nv;
}
