1 #include <cairo.h> 2 #include <gtk/gtk.h> 3 #include <math.h> 4 5 static 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 41 void 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 47 void 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 54 void 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 61 void 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
