1#include <cairo.h>
2#include <gtk/gtk.h>
3#include <math.h>
4
5static void draw_aligned_text(cairo_t *cr, const char *font, double x, double y,
6			       double fontsize, const char *text, int alignment)
7{
8#define CENTERED 0
9#define LEFT_JUSTIFIED 1
10#define RIGHT_JUSTIFIED 2
11
12	double factor, direction;
13	cairo_text_extents_t extents;
14
15	switch (alignment) {
16		case CENTERED:
17			direction = -1.0;
18			factor = 0.5;
19			break;
20		case RIGHT_JUSTIFIED:
21			direction = -1.0;
22			factor = 1.0;
23			break;
24		case LEFT_JUSTIFIED:
25		default:
26			direction = 1.0;
27			factor = 0.0;
28			break;
29	}
30	cairo_select_font_face(cr, font, CAIRO_FONT_SLANT_NORMAL, CAIRO_FONT_WEIGHT_NORMAL);
31
32	cairo_set_font_size(cr, fontsize);
33	cairo_text_extents(cr, text, &extents);
34	x = x + direction * (factor * extents.width  + extents.x_bearing);
35	y = y - (extents.height / 2 + extents.y_bearing);
36
37	cairo_move_to(cr, x, y);
38	cairo_show_text(cr, text);
39}
40
41void draw_centered_text(cairo_t *cr, const char *font, double x, double y,
42			       double fontsize, const char *text)
43{
44	draw_aligned_text(cr, font, x, y, fontsize, text, CENTERED);
45}
46
47void draw_right_justified_text(cairo_t *cr, const char *font,
48				double x, double y,
49				double fontsize, const char *text)
50{
51	draw_aligned_text(cr, font, x, y, fontsize, text, RIGHT_JUSTIFIED);
52}
53
54void draw_left_justified_text(cairo_t *cr, const char *font,
55				double x, double y,
56				double fontsize, const char *text)
57{
58	draw_aligned_text(cr, font, x, y, fontsize, text, LEFT_JUSTIFIED);
59}
60
61void draw_vertical_centered_text(cairo_t *cr, const char *font, double x,
62					double y, double fontsize,
63					const char *text)
64{
65	double sx, sy;
66	cairo_text_extents_t extents;
67
68	cairo_select_font_face(cr, font, CAIRO_FONT_SLANT_NORMAL, CAIRO_FONT_WEIGHT_NORMAL);
69
70	cairo_set_font_size(cr, fontsize);
71	cairo_text_extents(cr, text, &extents);
72	sx = x;
73	sy = y;
74	y = y + (extents.width / 2.0 + extents.x_bearing);
75	x = x - (extents.height / 2.0 + extents.y_bearing);
76
77	cairo_move_to(cr, x, y);
78	cairo_save(cr);
79	cairo_translate(cr, -sx, -sy);
80	cairo_rotate(cr, -90.0 * M_PI / 180.0);
81	cairo_translate(cr, sx, sy);
82	cairo_show_text(cr, text);
83	cairo_restore(cr);
84}
85
86