acre_data_t **data;
unsigned int data_size;
unsigned int num_data;
+
+ /* Data for drawing. */
+ cairo_t *cr;
+
+ /* Total size including labels. */
+ int width;
+ int height;
+
+ /* Position and size of chart alone. */
+ PangoRectangle chart;
};
/* Create a new, empty plot. */
#define ACRE_PAD (ACRE_FONT_SIZE)
#define ACRE_TICK_SIZE 4
-/* Draw the plot to the given cairo context within a user-space
- * rectangle from (0, 0) to (width, height). This size includes all
- * space for extra-plot elements (such as the title, the axis labels,
- * etc.)
- */
-void
-acre_draw (acre_t *acre, cairo_t *cr, double width, double height)
+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 chart, new_chart;
-
- cairo_save (cr);
-
- cairo_set_source_rgb (cr, 1, 1, 1);
-
- cairo_paint (cr);
+ PangoRectangle new_chart;
acre_font = pango_font_description_new ();
pango_font_description_set_family (acre_font, ACRE_FONT_FAMILY);
* 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). */
- chart.x = 0;
- chart.y = 0;
- chart.width = width;
- chart.height = height;
+ 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, chart.width * PANGO_SCALE);
- pango_layout_set_width (x_axis_layout, chart.width * PANGO_SCALE);
- pango_layout_set_width (y_axis_layout, chart.height * PANGO_SCALE);
+ 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);
new_chart.x = ACRE_PAD + y_axis_height +
ACRE_PAD + ACRE_FONT_SIZE;
- new_chart.width = width - chart.x - ACRE_PAD;
+ new_chart.width = acre->width - acre->chart.x - ACRE_PAD;
new_chart.y = ACRE_PAD + title_height + ACRE_PAD;
- new_chart.height = height - chart.y - (ACRE_FONT_SIZE + ACRE_PAD + x_axis_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 == chart.x &&
- new_chart.y == chart.y &&
- new_chart.width == chart.width &&
- new_chart.height == chart.height)
+ 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;
}
- chart.x = new_chart.x;
- chart.y = new_chart.y;
- chart.width = new_chart.width;
- chart.height = new_chart.height;
+ 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, chart.x, ACRE_PAD);
+ cairo_move_to (cr, acre->chart.x, ACRE_PAD);
pango_cairo_show_layout (cr, title_layout);
cairo_save (cr);
{
- cairo_translate (cr, ACRE_PAD, chart.y + chart.height);
+ 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, chart.x,
- chart.y + chart.height + ACRE_FONT_SIZE + ACRE_PAD);
+ 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);
+}
+
+/* Draw the plot to the given cairo context within a user-space
+ * rectangle from (0, 0) to (width, height). This size includes all
+ * space for extra-plot elements (such as the title, the axis labels,
+ * etc.)
+ */
+void
+acre_draw (acre_t *acre, cairo_t *cr, int width, int height)
+{
+ acre->cr = cr;
+ acre->width = width;
+ acre->height = height;
+
+ cairo_save (cr);
+
+ cairo_set_source_rgb (cr, 1, 1, 1);
+
+ cairo_paint (cr);
+
+ _draw_title_and_labels (acre);
cairo_rectangle (cr,
- chart.x - 0.5, chart.y - 0.5,
- chart.width + 1.0, chart.height + 1.0);
+ acre->chart.x - 0.5, acre->chart.y - 0.5,
+ acre->chart.width + 1.0, acre->chart.height + 1.0);
cairo_set_line_width (cr, 1.0);
cairo_stroke (cr);
}