source: python/demos/demo_keyboard.py @ 78561f7

feature/autosinkfeature/cnnfeature/cnn_orgfeature/constantqfeature/crepefeature/crepe_orgfeature/pitchshiftfeature/pydocstringsfeature/timestretchfix/ffmpeg5
Last change on this file since 78561f7 was 8fb567c, checked in by Paul Brossier <piem@piem.org>, 8 years ago

python/demos: remove unused import and variables

  • Property mode set to 100755
File size: 2.0 KB
Line 
1#! /usr/bin/env python
2
3def get_keyboard_edges(firstnote = 21, lastnote = 108):
4    octaves = 10
5
6    # build template of white notes
7    scalew  = 12/7.
8    xw_temp = [i*scalew for i in range(0,7)]
9    # build template of black notes
10    scaleb  = 6/7.
11    xb_temp = [i*scaleb for i in [1,3,7,9,11]]
12
13    xb,xw = [],[]
14    for octave in range(octaves-1):
15        for i in xb_temp:
16            curnote = i+12*octave
17            if  curnote > firstnote-1 and curnote < lastnote+1:
18                xb = xb + [curnote]
19    for octave in range(octaves-1):
20        for i in xw_temp:
21            curnote = i+12*octave
22            if  curnote > firstnote-1 and curnote < lastnote+1:
23                xw = xw + [curnote]
24
25    return xb, xw, 2/3. *scaleb, 1/2. * scalew
26
27def create_keyboard_patches(firstnote, lastnote, ax = None):
28    import matplotlib.pyplot as plt
29    from matplotlib.path import Path
30    import matplotlib.patches as mpatches
31
32    blacks, whites, b_width, w_width = get_keyboard_edges(firstnote, lastnote)
33
34    if not ax:
35        fig = plt.figure()
36        ax = fig.add_subplot(111)
37
38    verts, codes = [], []
39    for white in whites:
40        verts += [ (white - w_width, 0), (white - w_width, 1), (white + w_width, 1),  (white + w_width, 0) ]
41        verts += [ (white - w_width, 0) ]
42        codes  += [Path.MOVETO] + [Path.LINETO] * 4
43    path = Path(verts, codes)
44    patch = mpatches.PathPatch(path, facecolor= 'white', edgecolor='black', lw=1)
45    ax.add_patch(patch)
46
47    verts, codes = [], []
48    for black in blacks:
49        verts +=  [ (black - b_width, 0.33), (black - b_width, 1), (black + b_width, 1),  (black + b_width, 0.33) ]
50        verts += [ (black - b_width, 0.33) ]
51        codes += [Path.MOVETO] + [Path.LINETO] * 4
52    path = Path(verts, codes)
53    patch = mpatches.PathPatch(path, facecolor= 'black', edgecolor='black', lw=1)
54    ax.add_patch(patch)
55
56    ax.axis(xmin = firstnote, xmax = lastnote)
57
58if __name__ == '__main__':
59
60    import matplotlib.pyplot as plt
61    create_keyboard_patches(firstnote = 58, lastnote = 84)
62    plt.show()
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