satie
Version:
A sheet music renderer for the web
102 lines (101 loc) • 3.6 kB
JavaScript
/**
* This file is part of Satie music engraver <https://github.com/jnetterf/satie>.
* Copyright (C) Joshua Netterfield <joshua.ca> 2015 - present.
*
* Satie is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* Satie is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with Satie. If not, see <http://www.gnu.org/licenses/>.
*/
;
var lodash_1 = require("lodash");
var invariant = require("invariant");
var D = require("./private_metre_metreDurations");
var private_metre_getTSString_1 = require("./private_metre_getTSString");
// Adapted from Behind Bars (E. Gould) page 155
var BEAMING_PATTERNS = {
"1/16": [D._16],
"2/16": [D._16, D._16],
"1/8": [D._8],
"3/16": [D._8D],
"4/16": [D._8, D._8],
"2/8": [D._8, D._8],
"1/4": [D._4],
"5/16": [D._8D, D._8],
"5/16_alt": [D._8, D._8D],
"6/16": [D._8D, D._8D],
"3/8": [D._4D],
"4/8": [D._4, D._4],
"2/4": [D._2],
"2/4_clean": [D._4, D._4],
"1/2": [D._2],
"9/16": [D._8D, D._8D, D._8D],
"5/8": [D._4D, D._4],
"5/8_alt": [D._4, D._4D],
"12/16": [D._8D, D._8D, D._8D, D._8D],
"6/8": [D._4D, D._4D],
"3/4": [D._2D],
"7/8": [D._4, D._8D],
"7/8_alt": [D._8D, D._4],
"8/8": [D._4D, D._4D, D._4],
"8/8_alt": [D._4D, D._4, D._4D],
"8/8_alt2": [D._4, D._4D, D._4D],
"4/4": [D._2, D._2],
"4/4_clean": [D._4, D._4, D._4, D._4],
"2/2": [D._2, D._2],
"1/1": [D._1],
"9/8": [D._4D, D._4D, D._4D],
"10/8": [D._2, D._4D, D._4D],
"10/8_alt": [D._4D, D._2, D._4D],
"10/8_alt2": [D._4D, D._4D, D._2],
"5/4": [D._2D, D._2],
"5/4_alt": [D._2, D._2D],
"12/8": [D._4D, D._4D, D._4D, D._4D],
"6/4": [D._2D, D._2D],
"3/2": [D._2, D._2, D._2],
"7/4": [D._1, D._2D],
"7/4_alt": [D._2D, D._1],
"15/8": [D._4D, D._4D, D._4D, D._4D, D._4D],
"8/4": [D._1, D._1],
"4/2": [D._1, D._1],
"2/1": [D._1, D._1],
"18/8": [D._4D, D._4D, D._4D, D._4D, D._4D, D._4D],
"9/4": [D._2D, D._2D, D._2D]
};
function getBeamingPattern(time, alt) {
var pattern = BEAMING_PATTERNS[private_metre_getTSString_1.default(time) + (alt ? "_" + alt : "")];
var factors = {
4: [4, 3, 2, 1],
8: [12, 8, 4, 3, 2, 1],
16: [4, 3, 2, 1]
};
if (time.senzaMisura != null) {
return [];
}
if (!pattern) {
// TODO: Partial & Mixed
pattern = [];
// TODO: Varying denominators will err for the remainder of this function
var beatsToAdd_1 = lodash_1.reduce(time.beats, function (memo, beat) {
return memo + lodash_1.reduce(beat.split("+"), function (m, b) { return m + parseInt(b, 10); }, 0);
}, 0);
var ownFactors = factors[time.beatTypes[0]];
lodash_1.forEach(ownFactors, function (factor) {
while (beatsToAdd_1 >= factor) {
pattern = pattern.concat(BEAMING_PATTERNS[factor + "/" + time.beatTypes[0]]);
beatsToAdd_1 -= factor;
}
});
}
invariant(!!pattern, "Unknown beaming pattern");
return pattern;
}
exports.getBeamingPattern = getBeamingPattern;