Shapes.AddPolyline (PowerPoint)

Creates an open polyline or a closed polygon drawing. Returns a Shape object that represents the new polyline or polygon.

To form a closed polygon, assign the same coordinates to the first and last vertices in the polyline drawing.

AddPolyline (SafeArrayOfPoints)

SafeArrayOfPoints: An array of coordinate pairs that specifies the polyline drawing's vertices.

Dim lngSafeArrayOfPoints() As Long: lngSafeArrayOfPoints() = 
Dim shpAddPolyline As Shape
Set shpAddPolyline = ActiveWindow.Selection.SlideRange(1).Shapes.AddPolyline(SafeArrayOfPoints:=lngSafeArrayOfPoints())