chart_label (cr, 'l', 'x', geom->font_size, label);
cairo_restore (cr);
}
+
+
+void
+chart_write_legend (cairo_t *cr, const struct chart_geometry *geom)
+{
+ int i;
+ const int vstep = geom->font_size * 2;
+ const int xpad = 10;
+ const int ypad = 10;
+ const int swatch = 20;
+ const int legend_top = geom->data_top;
+ const int legend_bottom = legend_top -
+ (vstep * geom->n_datasets + 2 * ypad );
+
+ cairo_save (cr);
+
+ cairo_rectangle (cr, geom->legend_left, legend_top,
+ geom->legend_right - xpad - geom->legend_left,
+ legend_bottom - legend_top);
+ cairo_stroke (cr);
+
+ for (i = 0 ; i < geom->n_datasets ; ++i )
+ {
+ const int ypos = legend_top - vstep * (i + 1);
+ const int xpos = geom->legend_left + xpad;
+ const struct chart_colour *colour;
+
+ cairo_move_to (cr, xpos, ypos);
+
+ cairo_save (cr);
+ colour = &data_colour [ i % N_CHART_COLOURS];
+ cairo_set_source_rgb (cr,
+ colour->red / 255.0,
+ colour->green / 255.0,
+ colour->blue / 255.0);
+ cairo_rectangle (cr, xpos, ypos, swatch, swatch);
+ cairo_fill_preserve (cr);
+ cairo_stroke (cr);
+ cairo_restore (cr);
+
+ cairo_move_to (cr, xpos + swatch * 1.5, ypos);
+ chart_label (cr, 'l', 'x', geom->font_size, geom->dataset[i]);
+ }
+
+ cairo_restore (cr);
+}