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# -*- coding: utf-8 -*-
#Copyright (c) 2011, Walter Bender, Paulina Clares, Chris Rowe
# 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 3 of the License, or
# (at your option) any later version.
#
# You should have received a copy of the GNU General Public License
# along with this library; if not, write to the Free Software
# Foundation, 51 Franklin Street, Suite 500 Boston, MA 02110-1335 USA
# The challenges are arrays:
# [a fraction to display on the ball,
# the number of segments in the bar,
# the number of times this challenge has been played]
CHALLENGES = [[['1/2', 2, 0], ['1/3', 3, 0], ['1/4', 4, 0],
['2/4', 4, 0], ['2/3', 3, 0], ['3/4', 4, 0]],
[['1/8', 8, 0], ['2/8', 8, 0], ['3/8', 8, 0],
['4/8', 8, 0], ['5/8', 8, 0], ['6/8', 8, 0],
['7/8', 8, 0]],
[['1/6', 6, 0], ['2/6', 6, 0], ['3/6', 6, 0],
['4/6', 6, 0], ['5/6', 6, 0]],
[['1/5', 10, 0], ['2/5', 10, 0], ['3/5', 10, 0],
['4/5', 10, 0]],
[['1/10', 10, 0], ['2/10', 10, 0], ['3/10', 10, 0],
['4/10', 10, 0], ['5/10', 10, 0], ['6/10', 10, 0],
['7/10', 10, 0], ['8/10', 10, 0], ['9/10', 10, 0]],
[['1/12', 12, 0], ['2/12', 12, 0], ['3/12', 12, 0],
['4/12', 12, 0], ['3/12', 12, 0], ['6/12', 12, 0],
['7/12', 12, 0], ['8/12', 12, 0], ['9/12', 12, 0],
['10/12', 12, 0], ['11/12', 12, 0]],
[['1/16', 4, 0], ['2/16', 4, 0], ['3/16', 4, 0],
['4/16', 4, 0], ['5/16', 4, 0], ['6/16', 4, 0],
['7/16', 4, 0], ['8/16', 4, 0], ['9/16', 4, 0],
['10/16', 4, 0], ['11/16', 4, 0], ['12/16', 4, 0],
['13/16', 4, 0], ['14/16', 4, 0], ['15/16', 4, 0]]]
REWARD_HEIGHT = 25
STEPS = 100. # number of time steps per bounce rise and fall
STEP_PAUSE = 50 # milliseconds between steps
BOUNCE_PAUSE = 3000 # milliseconds between bounces
DX = 10 # starting step size for horizontal movement
DDX = 1.25 # acceleration during keypress
ACCELEROMETER_DEVICE = '/sys/devices/platform/lis3lv02d/position'
CRASH = 'crash.ogg' # wrong answer sound
LAUGH = 'bottle.ogg' # correct answer sound
BUBBLES = 'bubbles.ogg' # Easter Egg sound
import gtk
from random import uniform
import os
import gobject
from svg_utils import svg_header, svg_footer, svg_rect, svg_str_to_pixbuf, \
svg_from_file
from play_audio import play_audio_from_file
from ball import Ball
from bar import Bar
from gettext import gettext as _
import logging
_logger = logging.getLogger('fractionbounce-activity')
try:
from sugar.graphics import style
GRID_CELL_SIZE = style.GRID_CELL_SIZE
except ImportError:
GRID_CELL_SIZE = 0
from sprites import Sprites, Sprite
class Bounce():
''' The Bounce class is used to define the ball and the user
interaction. '''
def __init__(self, canvas, path, parent=None):
''' Initialize the canvas and set up the callbacks. '''
self.activity = parent
if parent is None: # Starting from command line
self.sugar = False
self.canvas = canvas
else: # Starting from Sugar
self.sugar = True
self.canvas = canvas
parent.show_all()
self.canvas.grab_focus()
if os.path.exists(ACCELEROMETER_DEVICE):
self.accelerometer = True
else:
self.accelerometer = False
self.canvas.set_flags(gtk.CAN_FOCUS)
self.canvas.add_events(gtk.gdk.BUTTON_PRESS_MASK)
self.canvas.add_events(gtk.gdk.BUTTON_RELEASE_MASK)
self.canvas.add_events(gtk.gdk.POINTER_MOTION_MASK)
self.canvas.add_events(gtk.gdk.KEY_PRESS_MASK)
self.canvas.add_events(gtk.gdk.KEY_RELEASE_MASK)
self.canvas.connect('expose-event', self._expose_cb)
self.canvas.connect('button-press-event', self._button_press_cb)
self.canvas.connect('button-release-event', self._button_release_cb)
self.canvas.connect('key_press_event', self._keypress_cb)
self.canvas.connect('key_release_event', self._keyrelease_cb)
self.width = gtk.gdk.screen_width()
self.height = gtk.gdk.screen_height() - GRID_CELL_SIZE
self.sprites = Sprites(self.canvas)
self.scale = gtk.gdk.screen_height() / 900.0
self.timeout = None
self.buddies = [] # used for sharing
self.my_turn = False
self.select_a_fraction = False
self.easter_egg = int(uniform(1, 100))
# Find paths to sound files
self.path_to_success = os.path.join(path, LAUGH)
self.path_to_failure = os.path.join(path, CRASH)
self.path_to_bubbles = os.path.join(path, BUBBLES)
self._create_sprites(path)
self.challenge = 0
self.expert = False
self.challenges = []
for challenge in CHALLENGES[self.challenge]:
self.challenges.append(challenge)
self.fraction = 0.5 # the target of the current challenge
self.label = '1/2' # the label
self.count = 0 # number of bounces played
self.correct = 0 # number of correct answers
self.press = None # sprite under mouse click
self.mode = 'fractions'
self.new_bounce = False
self.n = 0
self.dx = 0. # ball horizontal trajectory
# acceleration (with dampening)
self.ddy = (6.67 * self.height) / (STEPS * STEPS)
self.dy = self.ddy * (1 - STEPS) / 2. # initial step size
def _create_sprites(self, path):
''' Create all of the sprites we'll need '''
self.smiley_graphic = svg_str_to_pixbuf(svg_from_file(
os.path.join(path, 'smiley.svg')))
self.frown_graphic = svg_str_to_pixbuf(svg_from_file(
os.path.join(path, 'frown.svg')))
self.egg_graphic = svg_str_to_pixbuf(svg_from_file(
os.path.join(path, 'Easter_egg.svg')))
self.blank_graphic = svg_str_to_pixbuf(
svg_header(REWARD_HEIGHT, REWARD_HEIGHT, 1.0) + \
svg_rect(REWARD_HEIGHT, REWARD_HEIGHT, 5, 5, 0, 0,
'#C0C0C0', '#282828') + \
svg_footer())
self.ball = Ball(self.sprites, os.path.join(path, 'soccer.svg'))
self.current_frame = 0
self.bar = Bar(self.sprites, self.width, self.height, self.scale,
self.ball.width())
self.current_bar = self.bar.get_bar(2)
self.ball_y_max = self.bar.bar_y() - self.ball.height()
self.ball.move_ball((int((self.width - self.ball.width()) / 2),
self.ball_y_max))
def pause(self):
''' Pause play when visibility changes '''
if self.timeout is not None:
gobject.source_remove(self.timeout)
self.timeout = None
def we_are_sharing(self):
''' If there is more than one buddy, we are sharing. '''
if len(self.buddies) > 1:
return True
def its_my_turn(self):
''' When sharing, it is your turn... '''
gobject.timeout_add(1000, self._take_a_turn)
def _take_a_turn(self):
''' On your turn, choose a fraction. '''
self.my_turn = True
self.select_a_fraction = True
self.activity.set_player_on_toolbar(self.activity.nick)
self.activity.challenge.set_label(
_("Click on the bar to choose a fraction."))
def its_their_turn(self, nick):
''' When sharing, it is nick's turn... '''
gobject.timeout_add(1000, self._wait_your_turn, nick)
def _wait_your_turn(self, nick):
''' Wait for nick to choose a fraction. '''
self.my_turn = False
self.activity.set_player_on_toolbar(nick)
self.activity.challenge.set_label(
_('Waiting for %(buddy)s') % {'buddy': nick})
def play_a_fraction(self, fraction):
''' Play this fraction '''
fraction_is_new = True
for i, c in enumerate(self.challenges):
if c[0] == fraction:
fraction_is_new = False
self.n = i
break
if fraction_is_new:
self.add_fraction(fraction)
self.n = len(self.challenges)
self._choose_a_fraction()
self._move_ball()
def _button_press_cb(self, win, event):
''' Callback to handle the button presses '''
win.grab_focus()
x, y = map(int, event.get_coords())
self.press = self.sprites.find_sprite((x, y))
return True
def _button_release_cb(self, win, event):
''' Callback to handle the button releases '''
win.grab_focus()
x, y = map(int, event.get_coords())
if self.press is not None:
if self.we_are_sharing():
if self.select_a_fraction and self.press == self.current_bar:
# Find the fraction closest to the click
fraction = self._search_challenges(
(x - self.bar.bar_x()) / float(self.bar.width()))
self.select_a_fraction = False
self.activity.send_a_fraction(fraction)
self.play_a_fraction(fraction)
else:
if self.timeout is None and self.press == self.ball.ball:
self._choose_a_fraction()
self._move_ball()
return True
def _search_challenges(self, f):
''' Find the fraction which is closest to f in the list. '''
dist = 1.
closest = '1/2'
for c in self.challenges:
numden = c[0].split('/')
delta = abs((float(numden[0]) / float(numden[1])) - f)
if delta <= dist:
dist = delta
closest = c[0]
return closest
def _move_ball(self):
''' Move the ball and test boundary conditions '''
if self.new_bounce:
self.bar.mark.move((0, self.height)) # hide the mark
if not self.we_are_sharing():
self._choose_a_fraction()
self.new_bounce = False
self.dy = self.ddy * (1 - STEPS) / 2 # initial step size
if self.accelerometer:
fh = open(ACCELEROMETER_DEVICE)
string = fh.read()
xyz = string[1:-2].split(',')
self.dx = float(xyz[0]) / 18.
fh.close()
if self.ball.ball_x() + self.dx > 0 and \
self.ball.ball_x() + self.dx < self.width - self.ball.width():
self.ball.move_ball_relative((int(self.dx), int(self.dy)))
else:
self.ball.move_ball_relative((0, int(self.dy)))
# speed up ball in x while key is pressed
self.dx *= DDX
# accelerate in y
self.dy += self.ddy
if self.ball.ball_y() >= self.ball_y_max:
# hit the bottom
self.ball.move_ball((self.ball.ball_x(), self.ball_y_max))
self._test()
self.new_bounce = True
if self.we_are_sharing():
if self.my_turn:
# Let the next player know it is their turn.
i = (self.buddies.index(self.activity.nick) + 1) % \
len(self.buddies)
self.its_their_turn(self.buddies[i])
self.activity.send_event('t|%s' % (self.buddies[i]))
else:
if self._easter_egg_test():
self._animate()
else:
self.timeout = gobject.timeout_add(
max(STEP_PAUSE,
BOUNCE_PAUSE - self.count * STEP_PAUSE),
self._move_ball)
else:
self.timeout = gobject.timeout_add(STEP_PAUSE, self._move_ball)
def _animate(self):
''' A little Easter Egg just for fun. '''
if self.new_bounce:
self.dy = self.ddy * (1 - STEPS) / 2 # initial step size
self.new_bounce = False
self.current_frame = 0
self.frame_counter = 0
self.ball.move_frame(self.current_frame,
(self.ball.ball_x(), self.ball.ball_y()))
self.ball.move_ball((self.ball.ball_x(), self.height))
gobject.idle_add(play_audio_from_file, self, self.path_to_bubbles)
if self.accelerometer:
fh = open(ACCELEROMETER_DEVICE)
string = fh.read()
xyz = string[1:-2].split(',')
self.dx = float(xyz[0]) / 18.
fh.close()
else:
self.dx = uniform(-int(DX * self.scale), int(DX * self.scale))
self.ball.move_frame_relative(self.current_frame, (int(self.dx),
int(self.dy)))
self.dy += self.ddy
self.frame_counter += 1
self.current_frame = self.ball.next_frame(self.frame_counter)
if self.ball.frame_y(self.current_frame) >= self.ball_y_max:
# hit the bottom
self.ball.move_ball((self.ball.ball_x(), self.ball_y_max))
self.ball.hide_frames()
self._test(easter_egg=True)
self.new_bounce = True
self.timeout = gobject.timeout_add(BOUNCE_PAUSE, self._move_ball)
else:
gobject.timeout_add(STEP_PAUSE, self._animate)
def add_fraction(self, string):
''' Add a new challenge; set bar to 2x demominator '''
numden = string.split('/', 2)
self.challenges.append([string, int(numden[1]), 0])
def _choose_a_fraction(self):
''' Select a new fraction challenge from the table '''
if not self.we_are_sharing():
self.n = int(uniform(0, len(self.challenges)))
fstr = self.challenges[self.n][0]
if '/' in fstr: # fraction
numden = fstr.split('/', 2)
self.fraction = float(numden[0].strip()) / float(numden[1].strip())
elif '%' in fstr: # percentage
self.fraction = float(fstr.strip().strip('%').strip()) / 100.
else: # To do: add support for decimals (using locale)
_logger.debug('Could not parse challenge (%s)', fstr)
fstr = '1/2'
self.fraction = 0.5
if self.mode == 'percents':
self.label = str(int(self.fraction * 100 + 0.5)) + '%'
else: # percentage
self.label = fstr
if self.mode == 'sectors':
self.ball.new_ball_from_fraction(self.fraction)
self.activity.reset_label(self.label)
self.ball.ball.set_label(self.label)
self.bar.hide_bars()
if self.expert: # Show two-segment bar in expert mode
self.current_bar = self.bar.get_bar(2)
else:
if self.mode == 'percents':
nseg = 10
else:
nseg = self.challenges[self.n][1]
# generate new bar on demand
self.current_bar = self.bar.get_bar(nseg)
self.current_bar.move((self.bar.bar_x(), self.bar.bar_y()))
self.current_bar.set_layer(0)
def _easter_egg_test(self):
''' Test to see if we show the Easter Egg '''
delta = self.ball.width() / 8
x = self.ball.ball_x() + self.ball.width() / 2
f = self.bar.width() * self.easter_egg / 100.
if x > f - delta and x < f + delta:
return True
else:
return False
def _test(self, easter_egg=False):
''' Test to see if we estimated correctly '''
self.timeout = None
delta = self.ball.width() / 4
x = self.ball.ball_x() + self.ball.width() / 2
f = self.ball.width() / 2 + int(self.fraction * self.bar.width())
self.bar.mark.move((int(f - self.bar.mark_width() / 2),
self.bar.bar_y() - 2))
if self.challenges[self.n][2] == 0: # label the column
spr = Sprite(self.sprites, 0, 0, self.blank_graphic)
spr.set_label(self.label)
spr.move((int(self.n * 25), 0))
spr.set_layer(-1)
self.challenges[self.n][2] += 1
if x > f - delta and x < f + delta:
if not easter_egg:
spr = Sprite(self.sprites, 0, 0, self.smiley_graphic)
self.correct += 1
gobject.idle_add(play_audio_from_file, self, self.path_to_success)
else:
if not easter_egg:
spr = Sprite(self.sprites, 0, 0, self.frown_graphic)
gobject.idle_add(play_audio_from_file, self, self.path_to_failure)
if easter_egg:
spr = Sprite(self.sprites, 0, 0, self.egg_graphic)
spr.move((int(self.n * 25), int(self.challenges[self.n][2] * 25)))
spr.set_layer(-1)
# after enough correct answers, up the difficulty
if self.correct == len(self.challenges) * 2:
self.challenge += 1
if self.challenge < len(CHALLENGES):
for challenge in CHALLENGES[self.challenge]:
self.challenges.append(challenge)
else:
self.expert = True
self.count += 1
self.dx = 0. # stop horizontal movement between bounces
def _keypress_cb(self, area, event):
''' Keypress: moving the slides with the arrow keys '''
k = gtk.gdk.keyval_name(event.keyval)
if k in ['h', 'Left', 'KP_Left']:
self.dx = -DX * self.scale
elif k in ['l', 'Right', 'KP_Right']:
self.dx = DX * self.scale
elif k in ['KP_Page_Up', 'Return']:
self._choose_a_fraction()
self._move_ball()
else:
self.dx = 0.
return True
def _keyrelease_cb(self, area, event):
''' Keyrelease: stop horizontal movement '''
self.dx = 0.
return True
def _expose_cb(self, win, event):
''' Callback to handle window expose events '''
self.do_expose_event(event)
return True
def do_expose_event(self, event):
''' Handle the expose-event by drawing '''
# Restrict Cairo to the exposed area
cr = self.canvas.window.cairo_create()
cr.rectangle(event.area.x, event.area.y,
event.area.width, event.area.height)
cr.clip()
# Refresh sprite list
self.sprites.redraw_sprites(cr=cr)
def _destroy_cb(self, win, event):
''' Callback to handle quit '''
gtk.main_quit()
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