ConstraintPositionToNode constructor
Creates a new Constraint that constrains the poistion of a node to be
equal to the position of the targetNode
. Optionally an offset
can
be used and also dampening
. The targetNode doesn't need to have the
same parent, but they need to be added to the same SpriteBox.
Implementation
ConstraintPositionToNode(this.targetNode, {this.dampening, this.offset: Offset.zero});