Code

var stencil = VisioStencil.LoadFromXml("basic_shapes.xml");
var master = stencil.Masters.Where(
	m => m.UniversalName == "Right triangle").FirstOrDefault();
var shape = master.Shapes[0];

// make shape formulas evaluate with 100x100 size
// mapping coordinates to percents required by AnchorPoint
shape.Width = shape.Height = 100;

var ptrn = new AnchorPattern();
foreach (var connection in shape.Connections)
{
	ptrn.Points.Add(
		new AnchorPoint(
			Convert.ToDouble(connection.X),
			Convert.ToDouble(connection.Y)));
}