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* @file 音符模型
* @description 表示乐谱中的音符，包含音高、时值、连接等信息
*/
import {
NoteType, StemDirection, BeamType, AccidentalType,
TieSlurType, SyllabicType, ID
} from './types';
import { Pitch, Rest, Unpitched } from './Pitch';
/**
* 连音符（tuplet）信息
*/
export interface TimeModification {
/** 实际演奏的音符数 */
actualNotes: number;
/** 等效的正常音符数 */
normalNotes: number;
/** 基准音符类型 */
normalType?: NoteType;
/** 基准音符的附点数 */
normalDots?: number;
}
/**
* 连音线信息
*/
export interface TieInfo {
type: TieSlurType;
number?: number;
}
/**
* 符杠信息
*/
export interface BeamInfo {
number: number; // 1-8，表示第几层符杠
type: BeamType;
}
/**
* 歌词信息
*/
export interface Lyric {
/** 歌词编号（用于多段歌词） */
number?: string;
/** 音节类型 */
syllabic?: SyllabicType;
/** 歌词文字 */
text: string;
/** 是否延长 */
extend?: boolean;
/** 是否有省略符号 */
elision?: boolean;
}
/**
* 装饰音信息
*/
export interface GraceNote {
/** 是否为倚音（有时值） */
slash?: boolean;
/** 是否从前音偷时值 */
stealTimePrevious?: number;
/** 是否从后音偷时值 */
stealTimeFollowing?: number;
/** 制造时值 */
makeTime?: number;
}
/**
* 音符数据接口
*/
export interface INote {
/** 唯一标识 */
id?: ID;
// === 音高信息（三选一）===
/** 有音高的音符 */
pitch?: Pitch;
/** 休止符 */
rest?: Rest;
/** 无固定音高（打击乐） */
unpitched?: Unpitched;
// === 时值信息 ===
/** 时值（以 divisions 为单位） */
duration: number;
/** 符头类型 */
type?: NoteType;
/** 附点数量 */
dots?: number;
/** 连音符信息 */
timeModification?: TimeModification;
// === 和弦信息 ===
/** 是否为和弦的非第一个音 */
chord?: boolean;
// === 装饰音 ===
/** 装饰音信息 */
grace?: GraceNote;
/** 是否为提示音 */
cue?: boolean;
// === 连接信息 ===
/** 连音线 */
ties?: TieInfo[];
/** 符杠 */
beams?: BeamInfo[];
// === 显示信息 ===
/** 符干方向 */
stem?: StemDirection;
/** 临时记号 */
accidental?: AccidentalType;
/** 是否显示临时记号的括号 */
accidentalBracket?: boolean;
/** 是否为礼貌性临时记号 */
accidentalCourtesy?: boolean;
// === 声部信息 ===
/** 声部号 */
voice?: number;
/** 谱表号（多谱表时） */
staff?: number;
// === 歌词 ===
lyrics?: Lyric[];
// === 乐器 ===
instrumentId?: string;
// === 其他 ===
/** 记号（连线、演奏技法等） */
notations?: NoteNotations;
}
/**
* 音符上的各种记号
*/
export interface NoteNotations {
/** 连音线（视觉） */
tied?: { type: TieSlurType; number?: number }[];
/** 圆滑线 */
slurs?: { type: TieSlurType; number?: number }[];
/** 连音符括号 */
tuplet?: { type: 'start' | 'stop'; number?: number; bracket?: boolean };
/** 延音记号 */
fermata?: { type?: 'upright' | 'inverted'; shape?: string };
/** 演奏技法 */
articulations?: string[];
/** 装饰记号 */
ornaments?: string[];
/** 力度 */
dynamics?: string[];
/** 技术记号（指法等） */
technical?: string[];
/** 琶音 */
arpeggiate?: { direction?: 'up' | 'down' };
/** 滑音 */
glissando?: { type: 'start' | 'stop'; lineType?: string };
/** 滑奏 */
slide?: { type: 'start' | 'stop'; lineType?: string };
}
/**
* 音符类
*/
export class Note implements INote {
id?: ID;
pitch?: Pitch;
rest?: Rest;
unpitched?: Unpitched;
duration: number;
type?: NoteType;
dots: number;
timeModification?: TimeModification;
chord: boolean;
grace?: GraceNote;
cue: boolean;
ties?: TieInfo[];
beams?: BeamInfo[];
stem?: StemDirection;
accidental?: AccidentalType;
accidentalBracket: boolean;
accidentalCourtesy: boolean;
voice: number;
staff: number;
lyrics?: Lyric[];
instrumentId?: string;
notations?: NoteNotations;
constructor(data: INote) {
this.id = data.id;
this.pitch = data.pitch;
this.rest = data.rest;
this.unpitched = data.unpitched;
this.duration = data.duration;
this.type = data.type;
this.dots = data.dots ?? 0;
this.timeModification = data.timeModification;
this.chord = data.chord ?? false;
this.grace = data.grace;
this.cue = data.cue ?? false;
this.ties = data.ties;
this.beams = data.beams;
this.stem = data.stem;
this.accidental = data.accidental;
this.accidentalBracket = data.accidentalBracket ?? false;
this.accidentalCourtesy = data.accidentalCourtesy ?? false;
this.voice = data.voice ?? 1;
this.staff = data.staff ?? 1;
this.lyrics = data.lyrics;
this.instrumentId = data.instrumentId;
this.notations = data.notations;
}
/**
* 是否为休止符
*/
get isRest(): boolean {
return this.rest !== undefined;
}
/**
* 是否为有音高的音符
*/
get isPitched(): boolean {
return this.pitch !== undefined;
}
/**
* 是否为装饰音
*/
get isGrace(): boolean {
return this.grace !== undefined;
}
/**
* 是否为和弦音
*/
get isChordNote(): boolean {
return this.chord;
}
/**
* 获取实际时值（考虑连音符）
* @param divisions 每四分音符的divisions值
* @returns 以四分音符为单位的时值
*/
getActualDuration(divisions: number): number {
if (this.isGrace) return 0;
let baseDuration = this.duration / divisions;
if (this.timeModification) {
// 连音符：实际时值 = 书写时值 × (normalNotes / actualNotes)
baseDuration = baseDuration * this.timeModification.normalNotes / this.timeModification.actualNotes;
}
return baseDuration;
}
/**
* 获取简谱表示
* @param key 调号（五度圈位置）
* @param useMovableDo 是否首调
*/
getJianpuRepresentation(key: number = 0, useMovableDo: boolean = false): string {
if (this.isRest) {
return '0';
}
if (this.pitch) {
return this.pitch.toJianpuString(key, useMovableDo);
}
if (this.unpitched) {
return 'X'; // 打击乐
}
return '?';
}
/**
* 是否有连音线开始
*/
hasTieStart(): boolean {
return this.ties?.some(t => t.type === 'start') ?? false;
}
/**
* 是否有连音线结束
*/
hasTieStop(): boolean {
return this.ties?.some(t => t.type === 'stop') ?? false;
}
/**
* 克隆音符
*/
clone(): Note {
return new Note({
...this,
pitch: this.pitch?.clone(),
rest: this.rest ? new Rest(this.rest) : undefined,
ties: this.ties ? [...this.ties] : undefined,
beams: this.beams ? [...this.beams] : undefined,
lyrics: this.lyrics ? [...this.lyrics] : undefined,
notations: this.notations ? { ...this.notations } : undefined,
});
}
}
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