- * Find a tick spacing and number formatting that does not cause
- * the values to collide.
- * @param p A QPainter used to determine the needed space for the values.
- * @param scale A pv::view::View's scale.
- * @param offset A pv::view::View's offset.
- *
- * @return The tick period to use in 'first' and the prefix in 'second'.
+ * The vertical offset, relative to the bottom line of the widget,
+ * where the arrows of the cursor labels end.