| 1 | #include "cairo_text_helpers.h" |
| 2 | |
| 3 | #include <cairo.h> |
| 4 | #include <gtk/gtk.h> |
| 5 | #include <math.h> |
| 6 | |
| 7 | static void draw_aligned_text(cairo_t *cr, const char *font, double x, double y, |
| 8 | double fontsize, const char *text, int alignment) |
| 9 | { |
| 10 | #define CENTERED 0 |
| 11 | #define LEFT_JUSTIFIED 1 |
| 12 | #define RIGHT_JUSTIFIED 2 |
| 13 | |
| 14 | double factor, direction; |
| 15 | cairo_text_extents_t extents; |
| 16 | |
| 17 | switch (alignment) { |
| 18 | case CENTERED: |
| 19 | direction = -1.0; |
| 20 | factor = 0.5; |
| 21 | break; |
| 22 | case RIGHT_JUSTIFIED: |
| 23 | direction = -1.0; |
| 24 | factor = 1.0; |
| 25 | break; |
| 26 | case LEFT_JUSTIFIED: |
| 27 | default: |
| 28 | direction = 1.0; |
| 29 | factor = 0.0; |
| 30 | break; |
| 31 | } |
| 32 | cairo_select_font_face(cr, font, CAIRO_FONT_SLANT_NORMAL, CAIRO_FONT_WEIGHT_NORMAL); |
| 33 | |
| 34 | cairo_set_font_size(cr, fontsize); |
| 35 | cairo_text_extents(cr, text, &extents); |
| 36 | x = x + direction * (factor * extents.width + extents.x_bearing); |
| 37 | y = y - (extents.height / 2 + extents.y_bearing); |
| 38 | |
| 39 | cairo_move_to(cr, x, y); |
| 40 | cairo_show_text(cr, text); |
| 41 | } |
| 42 | |
| 43 | void draw_centered_text(cairo_t *cr, const char *font, double x, double y, |
| 44 | double fontsize, const char *text) |
| 45 | { |
| 46 | draw_aligned_text(cr, font, x, y, fontsize, text, CENTERED); |
| 47 | } |
| 48 | |
| 49 | void draw_right_justified_text(cairo_t *cr, const char *font, |
| 50 | double x, double y, |
| 51 | double fontsize, const char *text) |
| 52 | { |
| 53 | draw_aligned_text(cr, font, x, y, fontsize, text, RIGHT_JUSTIFIED); |
| 54 | } |
| 55 | |
| 56 | void draw_left_justified_text(cairo_t *cr, const char *font, |
| 57 | double x, double y, |
| 58 | double fontsize, const char *text) |
| 59 | { |
| 60 | draw_aligned_text(cr, font, x, y, fontsize, text, LEFT_JUSTIFIED); |
| 61 | } |
| 62 | |
| 63 | void draw_vertical_centered_text(cairo_t *cr, const char *font, double x, |
| 64 | double y, double fontsize, |
| 65 | const char *text) |
| 66 | { |
| 67 | double sx, sy; |
| 68 | cairo_text_extents_t extents; |
| 69 | |
| 70 | cairo_select_font_face(cr, font, CAIRO_FONT_SLANT_NORMAL, CAIRO_FONT_WEIGHT_NORMAL); |
| 71 | |
| 72 | cairo_set_font_size(cr, fontsize); |
| 73 | cairo_text_extents(cr, text, &extents); |
| 74 | sx = x; |
| 75 | sy = y; |
| 76 | y = y + (extents.width / 2.0 + extents.x_bearing); |
| 77 | x = x - (extents.height / 2.0 + extents.y_bearing); |
| 78 | |
| 79 | cairo_move_to(cr, x, y); |
| 80 | cairo_save(cr); |
| 81 | cairo_translate(cr, -sx, -sy); |
| 82 | cairo_rotate(cr, -90.0 * M_PI / 180.0); |
| 83 | cairo_translate(cr, sx, sy); |
| 84 | cairo_show_text(cr, text); |
| 85 | cairo_restore(cr); |
| 86 | } |
| 87 | |