1 /* scherzo - Music notation training
3 * score - Utilities for drawing (simple) musical scores
5 * Copyright © 2010 Carl Worth
7 * This program is free software: you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation, either version 3 of the License, or
10 * (at your option) any later version.
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with this program. If not, see http://www.gnu.org/licenses/ .
33 typedef struct score_brace
41 /* Height of a single staff */
44 /* Height of one space within a staff */
47 /* Minimal line width for staff lines */
50 /* Full width of staff */
53 score_brace_t **braces;
57 score_staff_t **staves;
61 typedef struct score_note
65 score_duration_t duration;
69 score_create (void *ctx)
73 score = talloc (ctx, score_t);
77 /* Also sets space_height and line_width */
78 score_set_staff_height (score, 24);
80 /* Just to have some nominal width. */
84 score->num_braces = 0;
87 score->num_staves = 0;
93 score_set_staff_height (score_t *score, int height)
95 score->space_height = (int) height / 4;
96 score->staff_height = score->space_height * 4;
98 score->line_width = score->space_height / 10;
99 if (score->line_width == 0)
100 score->line_width = 1;
102 return score->staff_height;
106 score_set_width (score_t *score, int width)
108 score->width = width;
111 /* Returns in brace_width the width of the brace */
113 _draw_brace (score_t *score, cairo_t *cr,
114 score_brace_t *brace, int *brace_width)
116 cairo_glyph_t brace_glyph;
117 cairo_text_extents_t brace_extents;
121 cairo_select_font_face (cr, "Gonville-Brace", 0, 0);
123 /* XXX: This hard-coded glyph index is pretty ugly. We should
124 * figure out how to lookup the glyph we want, (though, as it
125 * turns out, this brace font pretty much just has numbered glyph
126 * names for different sizes, so it wouldn't be all that different
127 * than just the bare index here). */
128 brace_glyph.index = 300;
130 brace_glyph.y = score->staff_height * (brace->first_staff + (2 * brace->num_staves - 1) / 2.0) + 1;
132 /* XXX: This font size (in conjunction with the glyph selection)
133 * is a rough guess at best. We should figure out how the brace
134 * font is intended to be used and actually measure to find the
135 * correctly-sized glyph. */
136 cairo_set_font_size (cr, (score->staff_height * 3) / 3.85);
138 cairo_glyph_extents (cr, &brace_glyph, 1, &brace_extents);
140 /* Subtract space for brace itself */
141 cairo_translate (cr, -brace_extents.x_bearing, 0);
143 cairo_set_source_rgb (cr, 0.0, 0.0, 0.0); /* black */
144 cairo_show_glyphs (cr, &brace_glyph, 1);
148 *brace_width = (int) -brace_extents.x_bearing;
151 /* Line containing middle C for the given clef. */
153 _score_clef_c_line (score_clef_t clef)
166 _score_note_to_line (score_staff_t *staff, score_note_t *note)
168 score_pitch_name_t name = SCORE_PITCH_NAME (note->pitch);
169 int c_line = _score_clef_c_line (staff->clef);
171 return c_line - (name - SCORE_PITCH_NAME_C) / 2.0 - 3.5 * (note->octave - 4);
175 _draw_note (score_t *score, cairo_t *cr,
176 score_staff_t *staff, score_note_t *note)
179 cairo_glyph_t note_glyph;
183 /* Which line should the note appear on? Line 0 is the top line of
184 * the staff and increasing downwards. (Negative values indicate a
185 * note on a ledger line above the staff). Values half way between
186 * integers indicate notes appearing on a space between two staff
187 * lines (or ledger lines). */
188 line = _score_note_to_line (staff, note);
190 cairo_select_font_face (cr, "Gonville-26", 0, 0);
191 cairo_set_font_size (cr, score->staff_height);
193 /* XXX: The hard-coded glyph indices here are very ugly. We should
194 * figure out how to lookup glyphs by name from this font. */
195 switch (note->duration) {
196 case SCORE_DURATION_1:
197 note_glyph.index = 127;
199 case SCORE_DURATION_2:
200 note_glyph.index = 85;
202 case SCORE_DURATION_4:
203 case SCORE_DURATION_8:
204 case SCORE_DURATION_16:
205 case SCORE_DURATION_32:
206 case SCORE_DURATION_64:
207 case SCORE_DURATION_128:
209 note_glyph.index = 84;
213 note_glyph.y = score->space_height * line + score->line_width / 2.0;
215 cairo_set_source_rgb (cr, 0.0, 0.0, 0.0); /* black */
216 cairo_show_glyphs (cr, ¬e_glyph, 1);
222 _draw_staff (score_t *score, cairo_t *cr,
223 score_staff_t *staff, int staff_width)
226 cairo_glyph_t clef_glyph;
230 cairo_select_font_face (cr, "Gonville-26", 0, 0);
232 cairo_set_font_size (cr, score->staff_height);
234 /* XXX: The hard-coded glyph indices here are very ugly. We should
235 * figure out how to lookup glyphs by name from this font. */
236 switch (staff->clef) {
239 clef_glyph.index = 46;
240 clef_glyph.y = 3 * score->space_height;
243 clef_glyph.index = 45;
244 clef_glyph.y = 1 * score->space_height;
247 clef_glyph.x = 3 * score->line_width;
250 cairo_set_source_rgb (cr, 0.0, 0.0, 0.0); /* black */
251 cairo_show_glyphs (cr, &clef_glyph, 1);
253 /* Draw staff lines */
254 for (i = 0; i < 5; i++) {
255 cairo_move_to (cr, 0, i * score->space_height + score->line_width / 2.0);
256 cairo_rel_line_to (cr, staff_width, 0);
259 cairo_set_line_width (cr, score->line_width);
261 cairo_set_source_rgb (cr, 0.0, 0.0, 0.0); /* black */
264 /* Make space for clef before drawing notes */
265 cairo_translate (cr, (int) (4 * score->space_height), 0);
268 for (i = 0; i < staff->num_notes; i++) {
269 _draw_note (score, cr, staff, staff->notes[i]);
270 /* Draw all notes concurrent for now (as a chord)
271 cairo_translate (cr, score->space_height * 2.0, 0);
279 score_draw (score_t *score, cairo_t *cr)
282 int staff_width = score->width;
286 if (score->num_braces)
290 for (i = 0; i < score->num_braces; i++)
291 _draw_brace (score, cr, score->braces[i], &brace_width);
293 /* Subtract space for brace itself */
294 cairo_translate (cr, brace_width, 0);
295 staff_width -= brace_width;
297 /* As well as some padding */
298 cairo_translate (cr, 2, 0);
302 /* Vertical lines at each end */
304 score->line_width / 2.0,
305 score->line_width / 2.0,
306 staff_width - score->line_width,
307 score->staff_height * 3);
308 cairo_set_source_rgb (cr, 0.0, 0.0, 0.0); /* black */
309 cairo_set_line_width (cr, score->line_width);
312 for (i = 0; i < score->num_staves; i++) {
313 _draw_staff (score, cr, score->staves[i], staff_width);
314 cairo_translate (cr, 0, 2 * score->staff_height);
321 score_add_brace (score_t *score, int staves)
323 score_brace_t *brace;
325 brace = talloc (score, score_brace_t);
329 brace->first_staff = score->num_staves;
330 brace->num_staves = staves;
333 score->braces = talloc_realloc (score,
337 if (score->braces == NULL) {
338 score->num_braces = 0;
342 score->braces[score->num_braces - 1] = brace;
347 score_add_staff (score_t *score, score_clef_t clef)
349 score_staff_t *staff;
351 staff = talloc (score, score_staff_t);
358 staff->num_notes = 0;
361 score->staves = talloc_realloc (score,
365 if (score->staves == NULL) {
366 score->num_staves = 0;
370 score->staves[score->num_staves - 1] = staff;
376 score_staff_add_note (score_staff_t *staff,
379 score_duration_t duration)
383 note = talloc (staff, score_note_t);
388 note->octave = octave;
389 note->duration = duration;
392 staff->notes = talloc_realloc (staff,
396 if (staff->notes == NULL) {
397 staff->num_notes = 0;
401 staff->notes[staff->num_notes - 1] = note;
407 score_staff_remove_note (score_staff_t *staff, score_note_t *note)
411 for (i = 0; i < staff->num_notes; i++)
412 if (staff->notes[i] == note)
415 if (i == staff->num_notes)
418 if (i < staff->num_notes - 1)
420 memmove (staff->notes + i,
421 staff->notes + i + 1,
422 (staff->num_notes - 1 - i) * sizeof (score_note_t *));
425 staff->num_notes -= 1;
429 score_staff_find_note (score_staff_t *staff,
432 score_duration_t duration)
437 for (i = 0; i < staff->num_notes; i++) {
438 note = staff->notes[i];
439 if (note->pitch == pitch &&
440 note->octave == octave &&
441 note->duration == duration)