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waterfall.py
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waterfall.py
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"""
Copyright 2015 Google Inc. All Rights Reserved.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
"""
import copy
import midi
import sys
import time
import piano_input_mock
import piano_output
class Waterfall(object):
"""Handles waterfall object.
Attributes:
midi_file: midi.MidiFile object.
midi_track: midi.MidiTrack object for which waterfall will be displayed.
state: List of 256 ints indicating which note is currently pressed.
-1: note is not currently playing.
nonnegative: note has been playing since specified time.
time: Time in midi ticks since start of file.
n_event: Ordinal of first midi event occurring at or after self.time.
score: User's current score.
piano_output: piano_output.PianoOutput object handling output graphics.
piano_input: piano_input.PianoInput object handling input from piano.
active_notes: set of currently pressed notes.
"""
def __init__(self, piano_input, piano_output, midi_file):
self.midi_file = midi_file
self.midi_track = self._GetLongestTrack(midi_file)
self.state = [-1] * 256
self.time = 0
self.n_event = 0
self.score = 0
self.piano_output = piano_output
self.piano_input = piano_input
self.active_notes = set()
self.TICKS_SHOWN = 300 # Total number of ticks shown simultaneously.
self.PIXELS_PER_TICK = (
float(self.piano_output.CANVAS_HEIGHT -
self.piano_output.KEYBOARD_HEIGHT) / self.TICKS_SHOWN)
def _GetLongestTrack(self, midi_file):
longestTrack = midi_file.tracks[0]
for track in midi_file.tracks:
if len(longestTrack.events) < len(track.events):
longestTrack = track
return longestTrack
def EndOfSong(self):
return self.n_event >= len(self.midi_track.events)
def Advance(self, delta):
"""Advances waterfall by delta ticks.
Returns False iff EOF reached.
"""
while not self.EndOfSong():
event = self.midi_track.events[self.n_event]
if event.delta >= delta:
event.delta -= delta
self.time += delta
break
self.time += event.delta
delta -= event.delta
self.n_event += 1
if event.ignore_me:
continue
if event.cmd == 0x80:
self.state[event.note] = -1
elif event.cmd == 0x90:
self.state[event.note] = self.time
def WaterfallNoteColor(self, note):
if note in self.active_notes:
if self.state[note] >= 0:
return '#00ff00'
if note % 12 in (0,2,4,5,7,9,11):
return '#8080ff' # white note
else:
return '#80ffff' # black note
def Draw(self):
cur_time = self.time
cur_n_event = self.n_event
draw_state = copy.copy(self.state)
self.piano_output.Clear()
self.piano_output.DrawPiano(True)
for note in self.active_notes:
if self.state[note] < 0:
self.piano_output.SetKeyColor(note, color='#ff0000', wide=True)
while cur_n_event < len(self.midi_track.events):
event = self.midi_track.events[cur_n_event]
cur_time += event.delta
cur_n_event += 1
if cur_time > self.time + self.TICKS_SHOWN:
break
if event.ignore_me:
continue
if event.cmd == 0x80:
# Note turned off. Draw rect for it.
y1 = max(0, (draw_state[event.note] - self.time) * self.PIXELS_PER_TICK)
y2 = (cur_time - self.time) * self.PIXELS_PER_TICK
self.piano_output.DrawRect(
event.note, y1, y2, self.WaterfallNoteColor(event.note))
draw_state[event.note] = -1
elif event.cmd == 0x90:
# Note turned on. Store state.
if draw_state[event.note] >= 0:
# Note is already on, do nothing
print('Warning: Waterfall.Draw ignoring double note-on '
'for note %d' % event.note)
draw_state[event.note] = cur_time
else:
print 'Warning: Waterfall.Draw ignoring cmd %02X' % event.cmd
# Everything that's still playing should get a rect to end of screen.
for note, state in enumerate(draw_state):
if state >= 0:
y1 = max(0, (state - self.time) * self.PIXELS_PER_TICK)
y2 = self.TICKS_SHOWN * self.PIXELS_PER_TICK
self.piano_output.DrawRect(
note, y1, y2, self.WaterfallNoteColor(note))
# Print score
self.piano_output.SetTitle('Score: %d' % self.score)
self.piano_output.Refresh()
def UpdatePianoInput(self):
while not self.piano_input.user_input.empty():
user_cmd = self.piano_input.user_input.get()
if user_cmd[1] == 0 and user_cmd[0] in self.active_notes:
self.active_notes.remove(user_cmd[0])
if user_cmd[1] > 0:
self.active_notes.add(user_cmd[0])
def UpdateScore(self, slowdown_factor=1.0):
gain = max(1, int(300.0 / slowdown_factor / slowdown_factor))
loss = max(1, int(50.0 / slowdown_factor / slowdown_factor))
for note in xrange(256):
if self.state[note] >= 0:
if note in self.active_notes:
self.score += gain
else:
self.score -= loss
if self.state[note] < 0 and note in self.active_notes:
self.score -= loss
def MenuRequested(self):
return self.active_notes == set([
self.piano_output.LOWEST_NOTE,
self.piano_output.HIGHEST_NOTE])
def Continue(self, slowdown_factor=1.0):
frames_per_sec = 15
prev_frame_wall_time = time.time()
self.active_notes = set()
while not self.EndOfSong():
self.UpdatePianoInput()
if self.MenuRequested():
break
self.UpdateScore(slowdown_factor)
self.Draw()
elapsed_wall_time = time.time() - prev_frame_wall_time
wait_time = 1.0 / frames_per_sec - elapsed_wall_time
if wait_time > 0: time.sleep(wait_time)
prev_frame_wall_time = time.time()
delta = int(self.midi_file.GetTicksPerSec(self.time) / frames_per_sec /
slowdown_factor)
if delta < 1:
delta = 1
self.Advance(delta)
prev_frame_wall_time = time.time()
return self.score
def main():
midi_file = midi.MidiFile(sys.argv[1])
waterfall = Waterfall(piano_input_mock.PianoInput(),
piano_output.PianoOutput(), midi_file)
waterfall.Continue(slowdown_factor=1)
if __name__ == '__main__':
main()