+ /**
+ * Sets the visual v-offset.
+ */
+ void set_v_offset(int offset);
+
+ /**
+ * Returns the SI prefix to apply to the graticule time markings.
+ */
+ unsigned int tick_prefix() const;
+
+ /**
+ * Returns the number of fractional digits shown for the time markings.
+ */
+ unsigned int tick_precision() const;
+
+ /**
+ * Returns period of the graticule time markings.
+ */
+ double tick_period() const;
+
+ /**
+ * Returns the unit of time currently used.
+ */
+ util::TimeUnit time_unit() const;
+