1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
|
# Copyright 2009 Simon Schampijer
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program 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 General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
import gtk
import logging
from gettext import gettext as _
from sugar.activity import activity
from sugar.graphics.toolbarbox import ToolbarBox
from sugar.activity.widgets import ActivityToolbarButton
from sugar.graphics.radiotoolbutton import RadioToolButton
from sugar.activity.widgets import StopButton
from draw_piano import PianoKeyboard
import gst
import math
class SimplePianoActivity(activity.Activity):
"""SimplePianoActivity class as specified in activity.info"""
def __init__(self, handle):
"""Set up the HelloWorld activity."""
activity.Activity.__init__(self, handle)
# we do not have collaboration features
# make the share option insensitive
self.max_participants = 1
# toolbar with the new toolbar redesign
toolbar_box = ToolbarBox()
activity_button = ActivityToolbarButton(self)
toolbar_box.toolbar.insert(activity_button, 0)
toolbar_box.toolbar.insert(gtk.SeparatorToolItem(), -1)
keybord_labels = RadioToolButton()
keybord_labels.props.icon_name = 'q_key'
keybord_labels.props.group = keybord_labels
keybord_labels.connect('clicked', self.set_keyboard_labels_cb)
toolbar_box.toolbar.insert(keybord_labels, -1)
notes_labels = RadioToolButton()
notes_labels.props.icon_name = 'do_key'
notes_labels.props.group = keybord_labels
notes_labels.connect('clicked', self.set_notes_labels_cb)
toolbar_box.toolbar.insert(notes_labels, -1)
separator = gtk.SeparatorToolItem()
separator.props.draw = False
separator.set_expand(True)
toolbar_box.toolbar.insert(separator, -1)
stop_button = StopButton(self)
toolbar_box.toolbar.insert(stop_button, -1)
stop_button.show()
self.set_toolbar_box(toolbar_box)
toolbar_box.show_all()
self.tone_generator = GstToneGenerator()
self.keyboard_letters = ['Q2W3ER5T6Y7UI', 'ZSXDCVGBHNJM', ',']
notes = ['DO', 'DO#', 'RE', 'RE#', 'MI', 'FA', 'FA#', 'SOL',
'SOL#', 'LA', 'LA#', 'SI']
self.notes_labels = [notes, notes, ['DO']]
self.piano = PianoKeyboard(octaves=2, add_c=True,
labels=self.keyboard_letters)
self.piano.connect('key_pressed', self.__key_pressed_cb)
self.piano.connect('key_released', self.__key_released_cb)
self.piano.show()
self.set_canvas(self.piano)
def set_notes_labels_cb(self, widget):
self.piano.font_size = 14
self.piano.set_labels(self.notes_labels)
def set_keyboard_labels_cb(self, widget):
self.piano.font_size = 20
self.piano.set_labels(self.keyboard_letters)
def __key_pressed_cb(self, widget, octave_clicked, key_clicked, letter):
logging.debug('Pressed Octave: %d Key: %d Letter: %s' %
(octave_clicked, key_clicked, letter))
if key_clicked >= 9:
key = key_clicked - 9
octave = octave_clicked + 1
else:
key = key_clicked + 3
octave = octave_clicked
freq = 440 * math.pow(2.0, octave + (key - 12.0) / 12.0)
logging.debug('Vales Octave: %d Key: %d Freq: %s' % (octave, key,
freq))
self.tone_generator.set_values(freq, 1)
self.tone_generator.start()
def __key_released_cb(self, widget, octave_clicked, key_clicked, letter):
self.tone_generator.stop()
class GstToneGenerator(object):
"""Gstreamer based tone generator.
from https://github.com/iamFIREcracker/py-tone-generator/
"""
def __init__(self):
str_pipe = '''audiotestsrc name=source !autoaudiosink'''
self.pipeline = gst.parse_launch(str_pipe)
self.source = self.pipeline.get_by_name('source')
def start(self):
self.pipeline.set_state(gst.STATE_PLAYING)
def stop(self):
self.pipeline.set_state(gst.STATE_NULL)
def set_values(self, freq, volume):
"""Change the frequency and volume values of the sound source.
Keywords:
freq frequency value between 0 and 20k.
volume volume value between 0 and 1.
"""
self.source.set_property('freq', max(0, min(freq, 20000)))
self.source.set_property('volume', max(0, min(volume, 1)))
|
