code: function handleMove(context, delta) {
  
      var shape = context.shape,
          direction = context.direction,
          resizeConstraints = context.resizeConstraints,
          newBounds;
  
      context.delta = delta;
  
      newBounds = resizeBounds(shape, direction, delta);
  
      // ensure constraints during resize
      context.newBounds = ensureConstraints(newBounds, resizeConstraints);
  
      // update + cache executable state
      context.canExecute = self.canResize(context);
    }
docs: Handle resize move by specified delta.
  
  @param {Object} context
  @param {Point} delta