Simple monitor for displaying MIDI status for digital pianos.
Du kannst nicht mehr als 25 Themen auswählen Themen müssen entweder mit einem Buchstaben oder einer Ziffer beginnen. Sie können Bindestriche („-“) enthalten und bis zu 35 Zeichen lang sein.

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  1. ((window, electron) => {
  2. const X_OFFSET = 0
  3. const NATURAL_KEY_WIDTH = 16;
  4. const ACCIDENTAL_KEY_WIDTH = 11;
  5. const accidental_key_x_offsets = [
  6. 10.0 / 112.0,
  7. 28.0 / 112.0,
  8. 57.0 / 112.0,
  9. 75.0 / 112.0,
  10. 93.0 / 112.0,
  11. ]
  12. const { ipcRenderer, } = electron
  13. const renderKeys = () => {
  14. let midi_note = 12
  15. const elements = {}
  16. let element
  17. const keyboard = window.document.getElementById('keyboard')
  18. for (let octave = 0; octave < 9; octave += 1) {
  19. for (let natural_key = 0; natural_key < 7; natural_key += 1) {
  20. element = window.document.createElement('div')
  21. element.classList.add('natural')
  22. element.classList.add('key')
  23. element.style.position = 'absolute'
  24. element.style.top = 0
  25. element.style.left = X_OFFSET + (octave * NATURAL_KEY_WIDTH * 7) + (natural_key * NATURAL_KEY_WIDTH) +
  26. 'px'
  27. element.style.width = NATURAL_KEY_WIDTH + 'px'
  28. element.appendChild(window.document.createElement('div'))
  29. elements[midi_note] = element
  30. keyboard.appendChild(element)
  31. switch (natural_key) {
  32. case 0:
  33. case 1:
  34. case 3:
  35. case 4:
  36. case 5:
  37. midi_note += 2;
  38. break;
  39. case 2:
  40. case 6:
  41. midi_note += 1;
  42. break;
  43. default:
  44. break;
  45. }
  46. }
  47. midi_note -= 11;
  48. for (let accidental_key = 0; accidental_key < 5; accidental_key += 1) {
  49. element = window.document.createElement('div')
  50. element.classList.add('accidental')
  51. element.classList.add('key')
  52. element.style.position = 'absolute'
  53. element.style.top = 0
  54. element.style.left = X_OFFSET + (octave * NATURAL_KEY_WIDTH * 7) + (NATURAL_KEY_WIDTH * 7 *
  55. accidental_key_x_offsets[accidental_key]) + 'px'
  56. element.style.width = ACCIDENTAL_KEY_WIDTH + 'px'
  57. element.appendChild(window.document.createElement('div'))
  58. elements[midi_note] = element
  59. keyboard.appendChild(element)
  60. switch (accidental_key) {
  61. case 0:
  62. case 2:
  63. case 3:
  64. midi_note += 2;
  65. break;
  66. case 1:
  67. case 4:
  68. midi_note += 3;
  69. break;
  70. default:
  71. break;
  72. }
  73. }
  74. midi_note -= 1;
  75. }
  76. return elements
  77. }
  78. const elements = renderKeys(null, null)
  79. ipcRenderer.on('note', (event, message) => {
  80. const [key, value, ] = message.split(':')
  81. if (value > 0) {
  82. elements[key].classList.add('pressed')
  83. } else {
  84. elements[key].classList.remove('pressed')
  85. }
  86. })
  87. ipcRenderer.on('pedal', (event, message) => {
  88. console.log(message)
  89. const [which, value, ] = message.split(':')
  90. const pedalIds = {
  91. 64: 'sustain',
  92. 66: 'sostenuto',
  93. 67: 'unacorda',
  94. }
  95. console.log(window.document.getElementById(pedalIds[which]))
  96. window.document.getElementById(pedalIds[which]).style.opacity = value / 127 * 0.75 + 0.25
  97. })
  98. })(window, require('electron'))