Code

class IsoLink : DiagramLink
{
	private Point AlignPoint(Point point)
	{
		double a = 0, r = 0;
			MindFusion.Geometry2D.Convert.CartesianToPolar(
			StartPoint, point, ref a, ref r);
		a = ((int)(a - 90) / 60) * 60 + 90;
		return MindFusion.Geometry2D.Convert.PolarToCartesian(StartPoint, a, r);
	}

	protected override void UpdateCreate(Point current)
	{
		current = AlignPoint(current);
		base.UpdateCreate(current);
	}

	protected override void CompleteCreate(Point end)
	{
		end = AlignPoint(end);
		base.CompleteCreate(end);
	}

	// todo: UpdateModify
} 

Code

class MyBehavior : DrawLinksBehavior
{
	public MyBehavior(Diagram diagram) : base(diagram) {}

	protected override DiagramLink  CreateLink()
	{
		return new IsoLink();
	}
}

diagram.CustomBehavior = new MyBehavior(diagram);
 

Code

Shape SkewShape(Shape shape)
{
	var transform = new SkewTransform(0, 30, 50, 50);
	var outline = new ElementTemplate[shape.Outline.Length];
	for (int i = 0; i < shape.Outline.Length; i++)
	{
		var element = shape.Outline[i];

		var line = element as LineTemplate;
		if (line != null)
		{
			var pt1 = new Point(line.Coordinates[0], line.Coordinates[1]);
			var pt2 = new Point(line.Coordinates[2], line.Coordinates[3]);
			pt1 = transform.Transform(pt1);
			pt2 = transform.Transform(pt2);
			outline[i] = new LineTemplate(pt1.X, pt1.Y, pt2.X, pt2.Y);
		}

		// todo: bezier, arc, roundrect elements
	}

	return new Shape(outline, FillRule.Nonzero);
}

shapeNode.Shape = SkewShape(Shapes.Collate);