Freehand line drawing

Freehand line drawing allows you to create complex action patterns - including circles.  The freehand line drawing tool allows you to extend any existing action line already on the surface.  To use the freehand drawing tool, add an action line to the surface, click the action line to highlight it, click the "Freehand Curve Drawing" icon on the bottom toolbar of the diagrammer (paint brush icon), finally, click the surface where you'd like the line to extend.  Below is a brief demonstration video: