From fb9904ee9af4320c9239246186e3e634e403f73e Mon Sep 17 00:00:00 2001
From: Gonzalo Odiard <godiard@gmail.com>
Date: Sun, 01 Jan 2012 22:20:41 +0000
Subject: Initial version

---
(limited to 'activity.py')

diff --git a/activity.py b/activity.py
new file mode 100644
index 0000000..1aa7715
--- /dev/null
+++ b/activity.py
@@ -0,0 +1,119 @@
+# 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.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)
+
+        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']
+        labels_tamtam = [notes, notes, ['DO']]
+
+        piano = PianoKeyboard(octaves=2, add_c=True,
+                labels=self.keyboard_letters)
+        piano.connect('key_pressed', self.__key_pressed_cb)
+        piano.connect('key_released', self.__key_released_cb)
+        piano.show()
+        self.set_canvas(piano)
+
+    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, 100)
+        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)))
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