How do I create an arrow Morph with code?

Last updated at 8:35 am UTC on 10 February 2017

Assuming a and b are your morphs:

 arrow := (LineMorph from: a center to: b center color: Color red width: 2) makeForwardArrow.
 arrow openInWorld.

If you want to update the position after the morphs move, do this:

 arrow setVertices: {a center. b center}