/// <summary>
/// Draws a partially defined graph edge</summary>
/// <param name="fromNode">Source node, or null</param>
/// <param name="fromRoute">Source route, or null</param>
/// <param name="toNode">Destination node, or null</param>
/// <param name="toRoute">Destination route, or null</param>
/// <param name="label">Edge label</param>
/// <param name="endPoint">Endpoint to substitute for source or destination (in client coords), if either is null</param>
/// <param name="g">Graphics object</param>
public override void Draw(
TNode fromNode,
NumberedRoute fromRoute,
TNode toNode,
NumberedRoute toRoute,
string label,
Point endPoint,
D2dGraphics g)
{
var inverse = g.Transform;
inverse.Invert();
PointF end = Matrix3x2F.TransformPoint(inverse, endPoint);
TNode node = (fromNode != null) ? fromNode : toNode;
CircleF boundary = GetBoundary(node);
Vec2F proj = new Vec2F();
if (CircleF.Project(new Vec2F(end), boundary, ref proj))
{
PointF start = new PointF(proj.X, proj.Y);
g.DrawLine(start, end, m_theme.OutlineBrush);
if (fromNode == null)
{
PointF temp = end;
end = start;
start = temp;
}
Vec2F endTangent = new Vec2F(end.X - start.X, end.Y - start.Y);
Vec2F arrowPosition = new Vec2F(end);
DrawArrow(arrowPosition, endTangent, m_theme.OutlineBrush, g);
if (!string.IsNullOrEmpty(label))
{
PointF textPoint = new PointF((end.X + start.X) * 0.5f, (end.Y + start.Y) * 0.5f);
RectangleF textBox = new RectangleF(textPoint.X - 512, textPoint.Y, 1024, m_theme.TextFormat.FontHeight);
//g.DrawString(label, m_theme.Font, m_theme.TextBrush, textBox, m_theme.CenterStringFormat);
g.DrawText(label, m_theme.TextFormat, textBox, m_theme.TextBrush);
}
}
}
/// <summary>
/// Finds node and/or edge hit by the given point</summary>
/// <param name="graph">Graph to test</param>
/// <param name="priorityEdge">Graph edge to test before others</param>
/// <param name="p">Point to test in graph space</param>
/// <param name="g">D2dGraphics object</param>
/// <returns>Hit record containing node and/or edge hit by the given point</returns>
public override GraphHitRecord <TNode, TEdge, NumberedRoute> Pick(
IGraph <TNode, TEdge, NumberedRoute> graph,
TEdge priorityEdge,
PointF p,
D2dGraphics g)
{
TNode pickedNode = null;
TEdge pickedEdge = null;
NumberedRoute fromRoute = null;
NumberedRoute toRoute = null;
Vec2F v = new Vec2F(p.X, p.Y);
if (priorityEdge != null &&
Pick(priorityEdge, v))
{
pickedEdge = priorityEdge;
}
else
{
foreach (TEdge edge in graph.Edges.Reverse())
{
if (Pick(edge, v))
{
pickedEdge = edge;
break;
}
}
}
foreach (TNode node in graph.Nodes.Reverse())
{
if (Pick(node, p))
{
pickedNode = node;
CircleF boundary = GetBoundary(node);
boundary.Radius -= m_theme.PickTolerance;
bool onEdge = !boundary.Contains(v);
if (pickedEdge == null)
{
if (onEdge)
{
// edge of node can be source or destination
fromRoute = new NumberedRoute();
toRoute = new NumberedRoute();
}
}
else // hit on edge and node
{
if (onEdge)
{
if (pickedEdge.FromNode == pickedNode)
{
fromRoute = new NumberedRoute();
}
else if (pickedEdge.ToNode == pickedNode)
{
toRoute = new NumberedRoute();
}
}
}
break;
}
}
var result = new GraphHitRecord <TNode, TEdge, NumberedRoute>(pickedNode, pickedEdge, fromRoute, toRoute);
PointF clientP = Matrix3x2F.TransformPoint(g.Transform, p);
if (fromRoute != null)
{
result.FromRoutePos = clientP;
}
if (toRoute != null)
{
result.ToRoutePos = clientP;
}
if (pickedNode != null && pickedEdge == null)
{
// label is centered in entire node
RectangleF labelBounds = GetBounds(pickedNode, g);
float dHeight = labelBounds.Height - m_theme.TextFormat.FontHeight;
labelBounds = new RectangleF(
labelBounds.X, labelBounds.Y + dHeight / 2, labelBounds.Width, labelBounds.Height - dHeight);
if (labelBounds.Contains(p))
{
DiagramLabel label = new DiagramLabel(
Rectangle.Truncate(labelBounds),
TextFormatFlags.SingleLine |
TextFormatFlags.HorizontalCenter);
return
(new GraphHitRecord <TNode, TEdge, NumberedRoute>(pickedNode, label));
}
}
else if (pickedEdge != null)
{
RectangleF labelBounds = GetLabelBounds(pickedEdge, g);
DiagramLabel label = new DiagramLabel(
Rectangle.Truncate(labelBounds),
TextFormatFlags.SingleLine |
TextFormatFlags.HorizontalCenter);
if (labelBounds.Contains(p))
{
return
(new GraphHitRecord <TNode, TEdge, NumberedRoute>(pickedEdge, label));
}
}
return(result);
}
