Addressed Jacob's feedback.

README.md

@@ -104,9 +104,9 @@ This collection should be considered a work in progress. When changes are made,
 serious consideration will be given to backward compatibility, but compatibility
 is not guaranteed. 
 
-The DiagramWidget itself is intended to be incorporated into a Fyne application. It provides a
-drawing area within which a diagram can be created. The diagram itself is a collection of 
-DiagramElement widgets (an interface). There are two types of DiagramElements: DiagramNode widgets and DiagramLink widgets. DiagramNode widgets are thin wrappers around a user-supplied CanvasObject.
+The DiagramWidget provides a drawing area within which a diagram can be created. The diagram itself is a collection of 
+DiagramElement widgets (an interface). There are two types of DiagramElements: DiagramNode widgets and DiagramLink widgets. 
+DiagramNode widgets are thin wrappers around a user-supplied CanvasObject.
 Any valid CanvasObject can be used. DiagramLinks are line-based connections between DiagramElements.
 Note that links can connect to other links as well as nodes.
 
@@ -125,7 +125,7 @@ or resized.
   <img src="img/DiagramWidget.png" width="1024" height="880" alt="Diagram Widget" style="max-width: 100%" />
 </p>
 
-**DiagramElement Interface**
+### DiagramElement Interface
 
 A DiagramElement is the base interface for any element of the diagram being managed by the 
 DiagramWidget. It provides a common interface for DiagramNode and DiagramLink widgets. The DiagramElement
@@ -134,12 +134,12 @@ for showing and hiding the handles that are used for graphically manipulating th
 The specifics of what handles do are different for nodes and links - these are described below in the
 sections for their respective widgets.
 
-**DiagramNode Widget**
+### DiagramNode Widget
 
 The DiagramNode widget is a wrapper around a user-supplied CanvasObject. In addition to the user-supplied
 CanvasObject, the node displays a border and, when selected, handles at the corners and edge mid-points that can be used to manipulate the size of the node. The node can be selected and dragged to a new position with a mouse by clicking in the border area around the canvas object. 
 
-**DiagramLink Widget**
+### DiagramLink Widget
 
 The DiagramLink widget provides a directed line-based connection between two DiagramElements. 
 The link is defined in terms of LinkPoints that are connected by LinkSegments (both of which

cmd/diagramdemo/main.go

@@ -17,9 +17,6 @@ var forceticks int = 0
 
 func forceanim(diagramWidget *diagramwidget.DiagramWidget) {
 
-	// XXX: very naughty -- accesses shared memory in potentially unsafe
-	// ways, this almost certainly has race conditions... don't do this!
-
 	for {
 		if forceticks > 0 {
 			diagramwidget.StepForceLayout(diagramWidget, 300)

widget/diagramwidget/anchoredtext.go

@@ -40,7 +40,6 @@ func NewAnchoredText(text string) *AnchoredText {
 	at.textEntry = widget.NewEntryWithData(at.displayedTextBinding)
 	at.textEntry.Wrapping = fyne.TextWrapOff
 	at.textEntry.Validator = nil
-	at.textEntry.Enable()
 	at.ExtendBaseWidget(at)
 	return at
 }

widget/diagramwidget/connectionpad.go

@@ -68,8 +68,7 @@ func (rp *RectanglePad) MouseDown(event *desktop.MouseEvent) {
 		if link.isConnectionAllowed(connectionTransaction.LinkPoint, rp) {
 			padOwnerPosition := rp.padOwner.Position()
 			pseudoEvent := &fyne.DragEvent{
-				PointEvent: fyne.PointEvent{},
-				Dragged:    fyne.NewDelta(event.Position.X+padOwnerPosition.X, event.Position.Y+padOwnerPosition.Y),
+				Dragged: fyne.NewDelta(event.Position.X+padOwnerPosition.X, event.Position.Y+padOwnerPosition.Y),
 			}
 			// the link point has to be changed before the handle is dragged
 			connectionTransaction.LinkPoint = connectionTransaction.Link.GetLinkPoints()[1]

widget/diagramwidget/geometry/r2/vec2.go

@@ -31,7 +31,7 @@ func (v Vec2) Length() float64 {
 
 // Dot returns the dot product of vector v and u
 func (v Vec2) Dot(u Vec2) float64 {
-	return v.X*u.X + v.Y + u.Y
+	return v.X*u.X + v.Y*u.Y
 }
 
 // Add returns the sum of vector v and u