This is a very basic Arc implementation:

http://mindfusion.eu/_samples/Arc.cs

You might play with the UpdateModify method to improve how mouse movement reflects on the angles. Currently it simply adds the horizontal mouse offset to the angles.

Take a look at the IconNodes sample to see how you might implement serialization for the SweepAngle and StartAngle properties.

This code lets the user draw Arc objects:

diagramView.Behavior = Behavior.Custom;
diagramView.CustomNodeType = typeof(Arc);

You could use Transparent ShapeNode objects to display text, instead of creating a class for text objects. As for lines, you might either use unconnected DiagramLink objects, or implement a Line class similar to Arc.

I hope that helps,
Stoyan

Is it possible to create a handle on the sweepangle and let the user click and drag the location?

Protected Overrides Sub UpdateModify(ByVal current As PointF, ByVal ist As InteractionState)

'Debug.Print(StartAngle & " -- " & sweepAngle)

sweepAngle = 90
'Can I make this a handle that the user can click and drag

End Sub

Thanks

The handle is not moving with the mouse correctly, is there a way to correct this?

Thanks.

Thanks again for the prompt reply.

That is precisely what we are trying to accomplish.

For lines you would not need to call the base class HitTestHandles and DrawHandles method. Just return 0 or 1 from HitTestHadles and render two selection handles in DrawHandles.

Assuming you have two PointF fields in the Line class, UpdateModify should set one of the points (depending on the current handle being dragged) to the InteractionState.CurrentPoint value. When either point changes, set Bounds to the smallest rectangle that contains both points, so that repainting and hit-testing work correctly.

I hope that helps,
Stoyan