85 lines
2.1 KiB
C
85 lines
2.1 KiB
C
#include <cairo.h>
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#include <gtk/gtk.h>
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#include <math.h>
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static void draw_aligned_text(cairo_t *cr, const char *font, double x, double y,
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double fontsize, const char *text, int alignment)
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{
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#define CENTERED 0
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#define LEFT_JUSTIFIED 1
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#define RIGHT_JUSTIFIED 2
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double factor, direction;
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cairo_text_extents_t extents;
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switch (alignment) {
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case CENTERED:
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direction = -1.0;
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factor = 0.5;
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break;
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case RIGHT_JUSTIFIED:
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direction = -1.0;
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factor = 1.0;
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break;
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case LEFT_JUSTIFIED:
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default:
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direction = 1.0;
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factor = 0.0;
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break;
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}
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cairo_select_font_face(cr, font, CAIRO_FONT_SLANT_NORMAL, CAIRO_FONT_WEIGHT_NORMAL);
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cairo_set_font_size(cr, fontsize);
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cairo_text_extents(cr, text, &extents);
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x = x + direction * (factor * extents.width + extents.x_bearing);
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y = y - (extents.height / 2 + extents.y_bearing);
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cairo_move_to(cr, x, y);
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cairo_show_text(cr, text);
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}
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void draw_centered_text(cairo_t *cr, const char *font, double x, double y,
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double fontsize, const char *text)
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{
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draw_aligned_text(cr, font, x, y, fontsize, text, CENTERED);
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}
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void draw_right_justified_text(cairo_t *cr, const char *font,
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double x, double y,
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double fontsize, const char *text)
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{
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draw_aligned_text(cr, font, x, y, fontsize, text, RIGHT_JUSTIFIED);
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}
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void draw_left_justified_text(cairo_t *cr, const char *font,
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double x, double y,
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double fontsize, const char *text)
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{
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draw_aligned_text(cr, font, x, y, fontsize, text, LEFT_JUSTIFIED);
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}
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void draw_vertical_centered_text(cairo_t *cr, const char *font, double x,
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double y, double fontsize,
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const char *text)
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{
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double sx, sy;
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cairo_text_extents_t extents;
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cairo_select_font_face(cr, font, CAIRO_FONT_SLANT_NORMAL, CAIRO_FONT_WEIGHT_NORMAL);
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cairo_set_font_size(cr, fontsize);
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cairo_text_extents(cr, text, &extents);
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sx = x;
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sy = y;
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y = y + (extents.width / 2.0 + extents.x_bearing);
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x = x - (extents.height / 2.0 + extents.y_bearing);
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cairo_move_to(cr, x, y);
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cairo_save(cr);
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cairo_translate(cr, -sx, -sy);
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cairo_rotate(cr, -90.0 * M_PI / 180.0);
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cairo_translate(cr, sx, sy);
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cairo_show_text(cr, text);
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cairo_restore(cr);
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}
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