code: function ScaleConstraint(src, scale, offset, dest, strength) {
    this.direction = Direction.NONE;
    this.scale = scale;
    this.offset = offset;
    ScaleConstraint.superConstructor.call(this, src, dest, strength);
  }
docs: /* --- *
  S c a l e   C o n s t r a i n t
  --- 
  Relates two variables by the linear scaling relationship: "v2 =
  (v1 * scale) + offset". Either v1 or v2 may be changed to maintain
  this relationship but the scale factor and offset are considered
  read-only.