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Pitch.ts.html

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  1. 

  2. <!doctype html>
    3. 

  3. <html lang="en">
    4. 

  4. 

  5. <head>
    6. 

  6.     <title>Code coverage report for music-core/models/Pitch.ts</title>
    7. 

  7.     <meta charset="utf-8" />
    8. 

  8.     <link rel="stylesheet" href="../../prettify.css" />
    9. 

  9.     <link rel="stylesheet" href="../../base.css" />
    10. 

  10.     <link rel="shortcut icon" type="image/x-icon" href="../../favicon.png" />
    11. 

  11.     <meta name="viewport" content="width=device-width, initial-scale=1" />
    12. 

  12.     <style type='text/css'>
    13. 

  13.         .coverage-summary .sorter {
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  14.             background-image: url(../../sort-arrow-sprite.png);
    15. 

  15.         }
    16. 

  16.     </style>
    17. 

  17. </head>
    18. 

  18.     
    19. 

  19. <body>
    20. 

  20. <div class='wrapper'>
    21. 

  21.     <div class='pad1'>
    22. 

  22.         <h1><a href="../../index.html">All files</a> / <a href="index.html">music-core/models</a> Pitch.ts</h1>
    23. 

  23.         <div class='clearfix'>
    24. 

  24.             
    25. 

  25.             <div class='fl pad1y space-right2'>
    26. 

  26.                 <span class="strong">100% </span>
    27. 

  27.                 <span class="quiet">Statements</span>
    28. 

  28.                 <span class='fraction'>238/238</span>
    29. 

  29.             </div>
    30. 

  30.         
    31. 

  31.             
    32. 

  32.             <div class='fl pad1y space-right2'>
    33. 

  33.                 <span class="strong">91.66% </span>
    34. 

  34.                 <span class="quiet">Branches</span>
    35. 

  35.                 <span class='fraction'>44/48</span>
    36. 

  36.             </div>
    37. 

  37.         
    38. 

  38.             
    39. 

  39.             <div class='fl pad1y space-right2'>
    40. 

  40.                 <span class="strong">100% </span>
    41. 

  41.                 <span class="quiet">Functions</span>
    42. 

  42.                 <span class='fraction'>14/14</span>
    43. 

  43.             </div>
    44. 

  44.         
    45. 

  45.             
    46. 

  46.             <div class='fl pad1y space-right2'>
    47. 

  47.                 <span class="strong">100% </span>
    48. 

  48.                 <span class="quiet">Lines</span>
    49. 

  49.                 <span class='fraction'>238/238</span>
    50. 

  50.             </div>
    51. 

  51.         
    52. 

  52.             
    53. 

  53.         </div>
    54. 

  54.         <p class="quiet">
    55. 

  55.             Press <em>n</em> or <em>j</em> to go to the next uncovered block, <em>b</em>, <em>p</em> or <em>k</em> for the previous block.
    56. 

  56.         </p>
    57. 

  57.         <template id="filterTemplate">
    58. 

  58.             <div class="quiet">
    59. 

  59.                 Filter:
    60. 

  60.                 <input type="search" id="fileSearch">
    61. 

  61.             </div>
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  62.         </template>
    63. 

  63.     </div>
    64. 

  64.     <div class='status-line high'></div>
    65. 

  65.     <pre><table class="coverage">
    66. 

  66. <tr><td class="line-count quiet"><a name='L1'></a><a href='#L1'>1</a>
    67. 

  67. <a name='L2'></a><a href='#L2'>2</a>
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  68. <a name='L3'></a><a href='#L3'>3</a>
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  69. <a name='L4'></a><a href='#L4'>4</a>
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  70. <a name='L5'></a><a href='#L5'>5</a>
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  71. <a name='L6'></a><a href='#L6'>6</a>
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  72. <a name='L7'></a><a href='#L7'>7</a>
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  73. <a name='L8'></a><a href='#L8'>8</a>
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  74. <a name='L9'></a><a href='#L9'>9</a>
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  75. <a name='L10'></a><a href='#L10'>10</a>
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  76. <a name='L11'></a><a href='#L11'>11</a>
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  77. <a name='L12'></a><a href='#L12'>12</a>
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  78. <a name='L13'></a><a href='#L13'>13</a>
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  79. <a name='L14'></a><a href='#L14'>14</a>
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  80. <a name='L15'></a><a href='#L15'>15</a>
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  81. <a name='L16'></a><a href='#L16'>16</a>
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  82. <a name='L17'></a><a href='#L17'>17</a>
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  83. <a name='L18'></a><a href='#L18'>18</a>
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  84. <a name='L19'></a><a href='#L19'>19</a>
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  85. <a name='L20'></a><a href='#L20'>20</a>
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  86. <a name='L21'></a><a href='#L21'>21</a>
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  87. <a name='L22'></a><a href='#L22'>22</a>
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  88. <a name='L23'></a><a href='#L23'>23</a>
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  89. <a name='L24'></a><a href='#L24'>24</a>
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  90. <a name='L25'></a><a href='#L25'>25</a>
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  91. <a name='L26'></a><a href='#L26'>26</a>
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  92. <a name='L27'></a><a href='#L27'>27</a>
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  93. <a name='L28'></a><a href='#L28'>28</a>
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  94. <a name='L29'></a><a href='#L29'>29</a>
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  95. <a name='L30'></a><a href='#L30'>30</a>
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  96. <a name='L31'></a><a href='#L31'>31</a>
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  97. <a name='L32'></a><a href='#L32'>32</a>
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  98. <a name='L33'></a><a href='#L33'>33</a>
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  99. <a name='L34'></a><a href='#L34'>34</a>
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  100. <a name='L35'></a><a href='#L35'>35</a>
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  101. <a name='L36'></a><a href='#L36'>36</a>
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  102. <a name='L37'></a><a href='#L37'>37</a>
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  103. <a name='L38'></a><a href='#L38'>38</a>
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  104. <a name='L39'></a><a href='#L39'>39</a>
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  105. <a name='L40'></a><a href='#L40'>40</a>
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  107. <a name='L42'></a><a href='#L42'>42</a>
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  113. <a name='L48'></a><a href='#L48'>48</a>
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  126. <a name='L61'></a><a href='#L61'>61</a>
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  128. <a name='L63'></a><a href='#L63'>63</a>
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  129. <a name='L64'></a><a href='#L64'>64</a>
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  130. <a name='L65'></a><a href='#L65'>65</a>
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  131. <a name='L66'></a><a href='#L66'>66</a>
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  132. <a name='L67'></a><a href='#L67'>67</a>
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  133. <a name='L68'></a><a href='#L68'>68</a>
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  146. <a name='L81'></a><a href='#L81'>81</a>
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  149. <a name='L84'></a><a href='#L84'>84</a>
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  542. <span class="cline-any cline-neutral">&nbsp;</span></td><td class="text"><pre class="prettyprint lang-js">/**
    543. 

  543.  * @file 音高模型
    544. 

  544.  * @description 表示音符的音高信息
    545. 

  545.  */
    546. 

  546. &nbsp;
    547. 

  547. import { StepName, AlterationType, AccidentalType } from './types';
    548. 

  548. &nbsp;
    549. 

  549. /**
    550. 

  550.  * 音高数据接口
    551. 

  551.  */
    552. 

  552. export interface IPitch {
    553. 

  553.   /** 音名 (C, D, E, F, G, A, B) */
    554. 

  554.   step: StepName;
    555. 

  555.   /** 八度 (4 = 中央C所在八度) */
    556. 

  556.   octave: number;
    557. 

  557.   /** 升降半音数 (-2 到 +2) */
    558. 

  558.   alter?: AlterationType;
    559. 

  559. }
    560. 

  560. &nbsp;
    561. 

  561. /**
    562. 

  562.  * 音高类
    563. 

  563.  * @description 封装音高的各种操作和转换
    564. 

  564.  */
    565. 

  565. export class Pitch implements IPitch {
    566. 

  566.   step: StepName;
    567. 

  567.   octave: number;
    568. 

  568.   alter: AlterationType;
    569. 

  569. &nbsp;
    570. 

  570.   constructor(data: IPitch) {
    571. 

  571.     this.step = data.step;
    572. 

  572.     this.octave = data.octave;
    573. 

  573.     this.alter = data.alter ?? 0;
    574. 

  574.   }
    575. 

  575. &nbsp;
    576. 

  576.   /**
    577. 

  577.    * 获取 MIDI 音高值 (0-127)
    578. 

  578.    * @returns MIDI pitch number
    579. 

  579.    */
    580. 

  580.   get midiPitch(): number {
    581. 

  581.     const stepToSemitone: Record&lt;StepName, number&gt; = {
    582. 

  582.       'C': 0, 'D': 2, 'E': 4, 'F': 5, 'G': 7, 'A': 9, 'B': 11
    583. 

  583.     };
    584. 

  584.     // MIDI 中央 C (C4) = 60
    585. 

  585.     return (this.octave + 1) * 12 + stepToSemitone[this.step] + this.alter;
    586. 

  586.   }
    587. 

  587. &nbsp;
    588. 

  588.   /**
    589. 

  589.    * 获取简谱数字 (1-7)
    590. 

  590.    * @param key 当前调号的五度圈位置（用于首调转换）
    591. 

  591.    * @param useMovableDo 是否使用首调（true=首调，false=固定调）
    592. 

  592.    * @returns 简谱数字 1-7
    593. 

  593.    */
    594. 

  594.   getJianpuNumber(key: number = 0, useMovableDo: boolean = false): number {
    595. 

  595.     // 固定调：C=1, D=2, E=3, F=4, G=5, A=6, B=7
    596. 

  596.     const stepToJianpu: Record&lt;StepName, number&gt; = {
    597. 

  597.       'C': 1, 'D': 2, 'E': 3, 'F': 4, 'G': 5, 'A': 6, 'B': 7
    598. 

  598.     };
    599. 

  599. &nbsp;
    600. 

  600.     if (!useMovableDo) {
    601. 

  601.       return stepToJianpu[this.step];
    602. 

  602.     }
    603. 

  603. &nbsp;
    604. 

  604.     // 首调：需要根据调号转换
    605. 

  605.     // key = 五度圈位置 (-7 到 +7)
    606. 

  606.     // 例如：G大调 key=1，则 G=do(1)
    607. 

  607.     const keyTonic = this.getKeyTonic(key);
    608. 

  608.     const stepSemitone: Record&lt;StepName, number&gt; = {
    609. 

  609.       'C': 0, 'D': 2, 'E': 4, 'F': 5, 'G': 7, 'A': 9, 'B': 11
    610. 

  610.     };
    611. 

  611.     
    612. 

  612.     // 计算当前音相对于主音的半音数
    613. 

  613.     const currentSemitone = stepSemitone[this.step] + this.alter;
    614. 

  614.     const tonicSemitone = stepSemitone[keyTonic.step] + (keyTonic.alter ?? 0);
    615. 

  615.     
    616. 

  616.     // 相对半音数（0-11）
    617. 

  617.     let relativeSemitone = (currentSemitone - tonicSemitone + 12) % 12;
    618. 

  618.     
    619. 

  619.     // 半音到简谱的映射（大调）
    620. 

  620.     const semitoneToJianpu: Record&lt;number, number&gt; = {
    621. 

  621.       0: 1, 2: 2, 4: 3, 5: 4, 7: 5, 9: 6, 11: 7
    622. 

  622.     };
    623. 

  623.     
    624. 

  624.     return semitoneToJianpu[relativeSemitone<span class="branch-0 cbranch-no" title="branch not covered" >] ?? 1;</span>
    625. 

  625.   }
    626. 

  626. &nbsp;
    627. 

  627.   /**
    628. 

  628.    * 获取八度偏移（相对于中央C所在八度）
    629. 

  629.    * @returns 八度偏移，正数为高八度，负数为低八度
    630. 

  630.    */
    631. 

  631.   getOctaveOffset(): number {
    632. 

  632.     return this.octave - 4;
    633. 

  633.   }
    634. 

  634. &nbsp;
    635. 

  635.   /**
    636. 

  636.    * 获取调号的主音
    637. 

  637.    * @param fifths 五度圈位置
    638. 

  638.    * @returns 主音的音高信息
    639. 

  639.    */
    640. 

  640.   private getKeyTonic(fifths: number): { step: StepName; alter?: AlterationType } {
    641. 

  641.     // 五度圈：F-C-G-D-A-E-B
    642. 

  642.     // fifths: -1(F) 0(C) 1(G) 2(D) 3(A) 4(E) 5(B) 6(F#) 7(C#)
    643. 

  643.     // fifths: -2(Bb) -3(Eb) -4(Ab) -5(Db) -6(Gb) -7(Cb)
    644. 

  644.     const fifthsToTonic: Record&lt;number, { step: StepName; alter?: AlterationType }&gt; = {
    645. 

  645.       [-7]: { step: 'C', alter: -1 },  // Cb
    646. 

  646.       [-6]: { step: 'G', alter: -1 },  // Gb
    647. 

  647.       [-5]: { step: 'D', alter: -1 },  // Db
    648. 

  648.       [-4]: { step: 'A', alter: -1 },  // Ab
    649. 

  649.       [-3]: { step: 'E', alter: -1 },  // Eb
    650. 

  650.       [-2]: { step: 'B', alter: -1 },  // Bb
    651. 

  651.       [-1]: { step: 'F' },             // F
    652. 

  652.       [0]:  { step: 'C' },             // C
    653. 

  653.       [1]:  { step: 'G' },             // G
    654. 

  654.       [2]:  { step: 'D' },             // D
    655. 

  655.       [3]:  { step: 'A' },             // A
    656. 

  656.       [4]:  { step: 'E' },             // E
    657. 

  657.       [5]:  { step: 'B' },             // B
    658. 

  658.       [6]:  { step: 'F', alter: 1 },   // F#
    659. 

  659.       [7]:  { step: 'C', alter: 1 },   // C#
    660. 

  660.     };
    661. 

  661.     return fifthsToTonic[fifths<span class="branch-0 cbranch-no" title="branch not covered" >] ?? { step: 'C' };</span>
    662. 

  662.   }
    663. 

  663. &nbsp;
    664. 

  664.   /**
    665. 

  665.    * 克隆音高对象
    666. 

  666.    */
    667. 

  667.   clone(): Pitch {
    668. 

  668.     return new Pitch({
    669. 

  669.       step: this.step,
    670. 

  670.       octave: this.octave,
    671. 

  671.       alter: this.alter
    672. 

  672.     });
    673. 

  673.   }
    674. 

  674. &nbsp;
    675. 

  675.   /**
    676. 

  676.    * 转为字符串表示
    677. 

  677.    * @returns 如 "C4", "F#5", "Bb3"
    678. 

  678.    */
    679. 

  679.   toString(): string {
    680. 

  680.     const alterStr = this.alter === 1 ? '#' : this.alter === -1 ? 'b' : 
    681. 

  681.                      this.alter === 2 ? '##' : this.alter === -2 ? 'bb' : '';
    682. 

  682.     return `${this.step}${alterStr}${this.octave}`;
    683. 

  683.   }
    684. 

  684. &nbsp;
    685. 

  685.   /**
    686. 

  686.    * 转为简谱字符串
    687. 

  687.    * @param key 调号
    688. 

  688.    * @param useMovableDo 是否首调
    689. 

  689.    * @returns 如 "1", "1̇", "1̣", "#1"
    690. 

  690.    */
    691. 

  691.   toJianpuString(key: number = 0, useMovableDo: boolean = false): string {
    692. 

  692.     const num = this.getJianpuNumber(key, useMovableDo);
    693. 

  693.     const octaveOffset = this.getOctaveOffset();
    694. 

  694.     
    695. 

  695.     // 升降号
    696. 

  696.     let prefix = '';
    697. 

  697.     if (this.alter === 1) prefix = '#';
    698. 

  698.     else if (this.alter === -1) prefix = 'b';
    699. 

  699.     else if (this.alter === 2) <span class="branch-0 cbranch-no" title="branch not covered" >prefix = '##';</span>
    700. 

  700.     else if (this.alter === -2) <span class="branch-0 cbranch-no" title="branch not covered" >prefix = 'bb';</span>
    701. 

  701.     
    702. 

  702.     // 八度点
    703. 

  703.     let suffix = '';
    704. 

  704.     if (octaveOffset &gt; 0) {
    705. 

  705.       suffix = '̇'.repeat(octaveOffset);  // 上点
    706. 

  706.     } else if (octaveOffset &lt; 0) {
    707. 

  707.       suffix = '̣'.repeat(-octaveOffset); // 下点
    708. 

  708.     }
    709. 

  709.     
    710. 

  710.     return `${prefix}${num}${suffix}`;
    711. 

  711.   }
    712. 

  712. &nbsp;
    713. 

  713.   /**
    714. 

  714.    * 从字符串解析音高
    715. 

  715.    * @param str 如 "C4", "F#5", "Bb3"
    716. 

  716.    */
    717. 

  717.   static fromString(str: string): Pitch {
    718. 

  718.     const match = str.match(/^([A-G])(#{1,2}|b{1,2})?(-?\d+)$/i);
    719. 

  719.     if (!match) {
    720. 

  720.       throw new Error(`Invalid pitch string: ${str}`);
    721. 

  721.     }
    722. 

  722.     
    723. 

  723.     const step = match[1].toUpperCase() as StepName;
    724. 

  724.     const alterStr = match[2] || '';
    725. 

  725.     const octave = parseInt(match[3], 10);
    726. 

  726.     
    727. 

  727.     let alter: AlterationType = 0;
    728. 

  728.     if (alterStr === '#') alter = 1;
    729. 

  729.     else if (alterStr === '##') alter = 2;
    730. 

  730.     else if (alterStr === 'b') alter = -1;
    731. 

  731.     else if (alterStr === 'bb') alter = -2;
    732. 

  732.     
    733. 

  733.     return new Pitch({ step, octave, alter });
    734. 

  734.   }
    735. 

  735. }
    736. 

  736. &nbsp;
    737. 

  737. /**
    738. 

  738.  * 休止符数据接口
    739. 

  739.  */
    740. 

  740. export interface IRest {
    741. 

  741.   /** 是否为全小节休止符 */
    742. 

  742.   measure?: boolean;
    743. 

  743.   /** 显示位置（谱表上的位置） */
    744. 

  744.   displayStep?: StepName;
    745. 

  745.   displayOctave?: number;
    746. 

  746. }
    747. 

  747. &nbsp;
    748. 

  748. /**
    749. 

  749.  * 休止符类
    750. 

  750.  */
    751. 

  751. export class Rest implements IRest {
    752. 

  752.   measure: boolean;
    753. 

  753.   displayStep?: StepName;
    754. 

  754.   displayOctave?: number;
    755. 

  755. &nbsp;
    756. 

  756.   constructor(data: IRest = {}) {
    757. 

  757.     this.measure = data.measure ?? false;
    758. 

  758.     this.displayStep = data.displayStep;
    759. 

  759.     this.displayOctave = data.displayOctave;
    760. 

  760.   }
    761. 

  761. }
    762. 

  762. &nbsp;
    763. 

  763. /**
    764. 

  764.  * 无固定音高音符（打击乐）
    765. 

  765.  */
    766. 

  766. export interface IUnpitched {
    767. 

  767.   displayStep: StepName;
    768. 

  768.   displayOctave: number;
    769. 

  769. }
    770. 

  770. &nbsp;
    771. 

  771. export class Unpitched implements IUnpitched {
    772. 

  772.   displayStep: StepName;
    773. 

  773.   displayOctave: number;
    774. 

  774. &nbsp;
    775. 

  775.   constructor(data: IUnpitched) {
    776. 

  776.     this.displayStep = data.displayStep;
    777. 

  777.     this.displayOctave = data.displayOctave;
    778. 

  778.   }
    779. 

  779. }
    780. 

  780. &nbsp;</pre></td></tr></table></pre>
    781. 

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    787. 

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    791. 

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    792. 

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    794. 

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