+#define ACRE_FONT_FAMILY "sans"
+#define ACRE_FONT_SIZE 12
+#define ACRE_TITLE_FONT_SIZE 32
+#define ACRE_PAD (ACRE_FONT_SIZE)
+#define ACRE_TICK_SIZE 4
+
+static void
+_draw_title_and_labels (acre_t *acre)
+{
+ cairo_t *cr = acre->cr;
+ PangoFontDescription *acre_font, *title_font;
+ PangoLayout *title_layout, *x_axis_layout, *y_axis_layout;
+ int title_width, title_height;
+ int x_axis_width, x_axis_height;
+ int y_axis_width, y_axis_height;
+ PangoRectangle new_chart;
+
+ acre_font = pango_font_description_new ();
+ pango_font_description_set_family (acre_font, ACRE_FONT_FAMILY);
+ pango_font_description_set_absolute_size (acre_font,
+ ACRE_FONT_SIZE * PANGO_SCALE);
+
+ title_font = pango_font_description_new ();
+ pango_font_description_set_family (title_font, ACRE_FONT_FAMILY);
+ pango_font_description_set_absolute_size (title_font,
+ ACRE_TITLE_FONT_SIZE * PANGO_SCALE);
+
+ title_layout = pango_cairo_create_layout (cr);
+ pango_layout_set_font_description (title_layout, title_font);
+ pango_layout_set_text (title_layout, acre->title, -1);
+ pango_layout_set_alignment (title_layout, PANGO_ALIGN_CENTER);
+
+ x_axis_layout = pango_cairo_create_layout (cr);
+ pango_layout_set_font_description (x_axis_layout, acre_font);
+ pango_layout_set_text (x_axis_layout, acre->x_axis_label, -1);
+ pango_layout_set_alignment (x_axis_layout, PANGO_ALIGN_CENTER);
+
+ y_axis_layout = pango_cairo_create_layout (cr);
+ pango_layout_set_font_description (y_axis_layout, acre_font);
+ pango_layout_set_text (y_axis_layout, acre->y_axis_label, -1);
+ pango_layout_set_alignment (y_axis_layout, PANGO_ALIGN_CENTER);
+
+ /* Iterate with the layout of the title and axis labels until they
+ * are stable, (this requires iteration since we don't know what
+ * to set their widths to in advance due to the wrapping of the
+ * other elements). */
+ acre->chart.x = 0;
+ acre->chart.y = 0;
+ acre->chart.width = acre->width;
+ acre->chart.height = acre->height;
+ while (1) {
+ pango_layout_set_width (title_layout, acre->chart.width * PANGO_SCALE);
+ pango_layout_set_width (x_axis_layout, acre->chart.width * PANGO_SCALE);
+ pango_layout_set_width (y_axis_layout, acre->chart.height * PANGO_SCALE);
+
+ pango_layout_get_pixel_size (title_layout, &title_width, &title_height);
+ pango_layout_get_pixel_size (x_axis_layout, &x_axis_width, &x_axis_height);
+ pango_layout_get_pixel_size (y_axis_layout, &y_axis_width, &y_axis_height);
+
+ new_chart.x = ACRE_PAD + y_axis_height +
+ ACRE_PAD + ACRE_FONT_SIZE;
+ new_chart.width = acre->width - acre->chart.x - ACRE_PAD;
+
+ new_chart.y = ACRE_PAD + title_height + ACRE_PAD;
+ new_chart.height = acre->height - acre->chart.y - (ACRE_FONT_SIZE + ACRE_PAD + x_axis_height + ACRE_PAD);
+
+ if (new_chart.x == acre->chart.x &&
+ new_chart.y == acre->chart.y &&
+ new_chart.width == acre->chart.width &&
+ new_chart.height == acre->chart.height)
+ {
+ break;
+ }
+
+ acre->chart.x = new_chart.x;
+ acre->chart.y = new_chart.y;
+ acre->chart.width = new_chart.width;
+ acre->chart.height = new_chart.height;
+ }
+
+ cairo_set_source_rgb (cr, 0, 0, 0);
+
+ cairo_move_to (cr, acre->chart.x, ACRE_PAD);
+ pango_cairo_show_layout (cr, title_layout);
+
+ cairo_save (cr);
+ {
+ cairo_translate (cr, ACRE_PAD, acre->chart.y + acre->chart.height);
+ cairo_rotate (cr, - M_PI / 2.0);
+ cairo_move_to (cr, 0, 0);
+ pango_cairo_show_layout (cr, y_axis_layout);
+ }
+ cairo_restore (cr);
+
+ cairo_move_to (cr, acre->chart.x,
+ acre->chart.y + acre->chart.height +
+ ACRE_FONT_SIZE + ACRE_PAD);
+ pango_cairo_show_layout (cr, x_axis_layout);
+}
+