Hi !

After drawing my own nodes based on a DiagramNode (thx to Stoyo!!) I need some Anchorpoints.

I loaded your IconNode Sample and modify the code for the node creation:

private void diagram_Clicked(object sender, DiagramEventArgs e)
{
IconNode iconNode = new IconNode(diagram);

		var apat2 = new AnchorPattern(new AnchorPoint[]
{
new AnchorPoint(10, 0, true, false, MarkStyle.Circle, Color.RoyalBlue),
new AnchorPoint(50, 0, true, false, MarkStyle.Circle, Color.Blue),
new AnchorPoint(90, 0, true, false, MarkStyle.Circle, Color.Firebrick),
new AnchorPoint(10, 100, false, true, MarkStyle.Rectangle),
new AnchorPoint(50, 100, false, true, MarkStyle.Rectangle),
new AnchorPoint(90, 100, false, true, MarkStyle.Rectangle),
new AnchorPoint(0, 50, true, true, MarkStyle.Custom)
});

    iconNode.AnchorPattern = apat2;

diagram.Nodes.Add(iconNode);

iconNode.Move(e.MousePosition.X, e.MousePosition.Y);
} 

I need to show the Anchorpoints always so I try setting "ShowAnchors" to "Always".
But the result is that the points are gone. If set it back to selection I see the points when I hover over the node with the mouse.

The next problem is the snapping. I need always the same Anchorpoints. So I set SnaptToAnchor to "OnCreate". But if you run the above code, create 2 nodes, link them you could a nive effect.
Move one node around the other and you will see that the link is snapping 

Maybe I did something completely wrong but I can´t find any hints in the help which pointing to some known issues.

And one last question about AnchorPoints. Is it a problem to replace the Points if the drawing of the node changes? I have a node where I can enable / disable an additional text. This causes some changes in the Draw methode. So can I change the positions of the Anchors within the Draw methode of my node?

Greetz
  Dominik

Hi !

Thx for the information.

I found a solution to draw custom AnchorPoints:

	  private void diagram1_DrawAnchorPoint(object sender, DrawAnchorPointEventArgs e)
	  {
		var idx = e.AnchorIndex;

		// ein Pixel sind wieviel Prozent ??
		var PixelProProz = e.Node.Bounds.Height / 100;

		// ein Prozent sind wievile Pixel ??
		var ProzProPixel = 100 / e.Node.Bounds.Height;

		var ins = e.Node.AnchorPattern.Points.Cast<AnchorPoint>().Count(point => point.AllowIncoming);

		// Top offset berechnen
		float topoff = 6;

		var y = topoff + (idx * 9);

		var posDraw = new PointF
		{
		    X = -2 + e.Node.Bounds.X,
		    Y = y + e.Node.Bounds.Y
		};

		var posPoint = new PointF
		{
		    X = -2 * ProzProPixel,
		    Y = (y + 3) * ProzProPixel
		};

		var drawPen = new Pen(Color.Black)
		{
		    Width = 1
		};
		e.Graphics.FillEllipse(Brushes.Red, posDraw.X, posDraw.Y, 6, 6);
		e.Graphics.DrawEllipse(drawPen, posDraw.X, posDraw.Y, 6, 6);

		// AnchorPoint umsetzen
		e.AnchorPattern.Points[idx].X = posPoint.X;
		e.AnchorPattern.Points[idx].Y = posPoint.Y;
		SiAuto.Main.LogVerbose("Point {0} {1}", idx, posPoint);
	  } 

There is only one question left.
Is there a way to realize a snapping and hoovering effect?

Hoover : If the user places the mouse over an Anchorpoint the point gets another color or an additional border. So he will instantly see that he could start / end a link there.
Snapping : If the user draws a link the endpoint automatically catches / snaps the closest AnchorPoint.

Hi Stoyan,

again a great info.

Is there an option to allow only drawing links from Outgoing Anchors?