Ellipse with Multiports

GoDiagram (6 and previous)
1

I’m interested in creating an ellipse node that dynamically create ports on the edge of the ellipse where the cursor is closest. Suggestions on how best to proceed?

2

If you look at Demo1, the ellipse with the label “a longer label” does this… it’s created with this snippet:

  GoBasicNode bn2 = new GoBasicNode();
  bn2.Location = new PointF(400, 300);
  bn2.LabelSpot = GoObject.Middle;
  bn2.Text = "a longer label";
  doc.Add(bn2);

Now… this isn’t really creating dynamic ports… there’s one port that uses the ellipse as it’s shape. and if you move a connecting node, the link will stay “connected” to the closest point between the two nodes.

Does that meet your needs, or do you really need a “fixed” port that gets created when the link is established?

3

I’m trying to simulate the GoBoxNode.LinkPointsSpread feature, but with an ellipse shape. I’ve considered the option you mentioned, but when I have shape.Orthogonal and shape.AvoidsNodes turned on, the link points are limited to top, bottom, left, right. Further suggestions?

4

[code] [Serializable]
public class BoxNode4 : GoBoxNode {
public BoxNode4() {
this.Label.Alignment = Middle;
this.PortBorderMargin = new SizeF(20, 10); // extra room needed due to ellipse
}

protected override GoPort CreatePort() {
  return new BoxPort4();
}

}

[Serializable]
public class BoxPort4 : GoBoxPort {
public BoxPort4() {
this.LinkPointsSpread = true;
this.Style = GoPortStyle.Ellipse;
this.BrushColor = Color.White;
this.PenColor = Color.Black;
}

protected override void AssignLinkPoints(GoBoxPortLinkInfo[] linkinfos) {
  base.AssignLinkPoints(linkinfos);
  PointF c = this.Center;
  foreach (GoBoxPortLinkInfo info in linkinfos) {
    PointF result;
    GoEllipse.NearestIntersectionOnEllipse(this.Bounds, info.LinkPoint, c, out result);
    info.LinkPoint = result;
  }
}

}[/code]