There aren't such shapes available out of the box. If you have them as SVG images, you could use SvgNodes to display them. Otherwise create custom Shape definitions corresponding to the shapes and assign them to ShapeNodes.

I hope that helps,
Stoyan

SVG is a vector graphics format and SVG images scale smoothly when resized; bitmap images don't.

Loading a bitmap image looks like:

ShapeNode node = new ShapeNode(diagram);
diagram.Nodes.Add(node)
node.Image = Image.FromFile(...);
node.Transparent = true; // show just the image
 

And SVG image:

SvgContent content = new SvgContent();
content.Parse(...);

SvgNode node = new SvgNode(diagram);
diagram.Nodes.Add(node)
node.Content = content;
node.Transparent = true; // show just the image
 

I hope that helps,
Stoyan

You can use the shape designer tool to create Shape definitions. E.g. to create the Speaker shape from the "Fundamental Items" Visio palette, choose File->New in shape designer, right-click the top and bottom lines of the default rectangle and choose Split -> To Line, and arrange the 6 line segments to get the Speaker outline. Then right click on empty area and choose Insert Decoration -> Line, do that three times, and arrange them as in the Speaker shape.

You can either save the result in a shape library file and later load it for use by calling ShapeLibrary.LoadFrom(...), or copy and paste the generated code to your app init method:

// C# ShapeTemplate definition
new Shape(
	new ElementTemplate[]
	{
		new LineTemplate(30, 20, 70, 20),
		new LineTemplate(70, 20, 100, 0),
		new LineTemplate(100, 0, 100, 100),
		new LineTemplate(100, 100, 70, 80),
		new LineTemplate(70, 80, 30, 80),
		new LineTemplate(30, 80, 30, 20)
	},
	new ElementTemplate[]
	{
		new LineTemplate(70, 20, 70, 80),
		new LineTemplate(0, 40, 30, 40),
		new LineTemplate(0, 60, 30, 60)
	},
 null, FillMode.Winding,   "Speaker" );
 

Later you can assign the shape to a node by calling node.Shape = Shape.FromId("Speaker").

For Visio shapes that are not filled, e.g. the "Alternating pulse" shape, leave the default rectangular outline in the shape definition, and later in the code set Shape.EnableOutline = false to leave only the decoration lines visible.

I hope that helps,
Stoyan