+struct chart_geometry;
+
+
+enum marker_type
+ {
+ MARKER_CIRCLE, /* Hollow circle. */
+ MARKER_ASTERISK, /* Asterisk (*). */
+ MARKER_SQUARE /* Hollow square. */
+ };
+
+void chart_draw_marker (cairo_t *, double x, double y, enum marker_type,
+ double size);
+
+void chart_label (cairo_t *, int horz_justify, int vert_justify,
+ double font_size, const char *);