whole_func_string: function(dx, dy, ref) {
              // Revert the translation and measure the change in angle around x-axis.
              return point(this).offset(-dx, -dy).theta(ref) - this.theta(ref);
          }
func_code_string: function(dx, dy, ref) {
              // Revert the translation and measure the change in angle around x-axis.
              return point(this).offset(-dx, -dy).theta(ref) - this.theta(ref);
          }
func_documentation_string: Returns change in angle from my previous position (-dx, -dy) to my new position relative to ref point.