YOUR OFFICIAL RASPBERRY PI MAGAZINE

THE STORY TRAIN
Tutorial
StoryTrain.py
import pygame, time, os
import wiringpi2 as io
from tkFileDialog import askopenfilename
pygame.init()
# initialise graphics
interface
pygame.mixer.quit()
pygame.mixer.init(frequency=22050, size=-16, channels=2,
buffer=512)
os.environ['SDL_VIDEO_WINDOW_POS'] = 'center'
pygame.display.set_caption("The Story Train")
pygame.event.set_allowed(None)
pygame.event.set_allowed([pygame.KEYDOWN,pygame.QUIT])
screen = pygame.display.set_mode([600,400],0,32)
try :
io.wiringPiSetupGpio()
except :
print"start IDLE with 'gksudo idle' from command line"
os._exit(1)
pinList= [2,3] # GPIO track sensing switches
def main():
global pageList, pagesInStory
initGPIO()
print"The Story Train"
while True:
notFinished = True
page = 1
getStory() # get the story to show
showPage(0) # beginning picture
while notFinished:
holdUntilSwitch(1)
# trigger halfway round display
showPage(-1)
holdUntilSwitch(0)
# display page sound and picture
showPage(page)
page += 1
if page >= pagesInStory :
notFinished = False
showPage(pagesInStory) # the end
time.sleep(2.0)
def initGPIO():
for pin in range (0,len(pinList) ):
io.pinMode(pinList[pin],0)
io.pullUpDnControl(pinList[pin],2) # input enable
pull-up
def holdUntilSwitch(pin):
global advance
advance = False
while (io.digitalRead(pinList[pin]) == 1) and (advance
== False):
checkForEvent()
time.sleep(0.2) # let other apps have a look in
return
def showPage(page):
pygame.draw.rect(screen, (0,0,0),
(0,0,600,400),0)
if page ==-1 :
screen.blit(nextPicture,[0,0])
nextSound.play()
else :
screen.
blit(pagePictures[page],[0,0])
pageSounds[page].play()
pygame.display.update()
time.sleep(0.4)
def getStory(): # get the list of pages to show
global pagePictures, pageSounds, pagesInStory,
nextSound, nextPicture
pathP = "nothing"
pathS = "nothing"
while not(os.path.exists(pathP) and (os.path.
exists(pathS)) ):
checkForEvent()
filename = askopenfilename()
path = os.path.dirname(filename)
pathP = path + "/pages/"
pathS = path + "/sounds/"
pageList = [os.path.join(pathP,fn) for fn in next(os.
walk(pathP))[2]]
list.sort(pageList) # put in alphabetical order
pagePictures = [ pygame.image.load(pageList[frame]).
convert_alpha()
for frame in range(1,len(pageList))]
soundList = [os.path.join(pathS,fn) for fn in next(os.
walk(pathS))[2]]
list.sort(soundList) # put in alphabetical order
pageSounds = [ pygame.mixer.Sound(soundList[frame])
for frame in range(1,len(soundList))]
pagesInStory = len(pagePictures)-1
nextSound = pygame.mixer.Sound(path+"/nextComing.wav")
nextPicture = pygame.image.load(path+"/nextComing.
jpg").convert_alpha()
def terminate(): # close down the program
print ("Closing down please wait")
pygame.mixer.quit()
pygame.quit() # close pygame
os._exit(1)
def checkForEvent(): # see if we need to quit
global advance
event = pygame.event.poll()
if event.type == pygame.QUIT :
terminate()
if event.type == pygame.KEYDOWN :
if event.key == pygame.K_ESCAPE :
terminate()
if event.key == pygame.K_RIGHT :
advance = True
# Main program logic:
if __name__ == '__main__':
main()
Language
>PYTHON 2.7
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raspberrypi.org/magpi January 2016
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