CODING

Tutorial
derby.py
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WALKTHROUGH
# Pi Derby - Horse race game
# By Mike Cook - November 2016
import pygame, time, os, random
import wiringpi2 as io
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 Raspberry Pi Derby")
pygame.event.set_allowed(None)
pygame.event.set_allowed([pygame.KEYDOWN,pygame.QUIT])
screen = pygame.display.set_mode([942,466],0,32)
textHeight = 36 ; textHeight2 = 24
font = pygame.font.Font(None, textHeight)
font2 = pygame.font.Font(None, textHeight2)
random.seed() ; winningPost = 704
ballPins = [ [17,24,4,27],[22,10,9,11 ] ]
targetGx = [ 18,102,18,102 ]
targetGy = [ 18,18,102,102 ]
gallopInc = [1,1] ; gallop= [0,0]
dInc = [0,0] # distance increment
puzzle = [5,5] ; restart = True
moveTarget = [1,1] ; movePhase = [0,0]
def main():
global restart,dInc,gallop,puzzle,moveTarget,movePhase
initGraphics()
initGPIO()
#print "The Pi Derby"
distance = [-120, -120]
showPicture(distance,gallop)
while True:
checkForEvent()
if restart :
gameSound[3].play()
windBack(distance)
pygame.mixer.fadeout(1000)
time.sleep(3.5)
distance[0] = -120 ; distance[1] = -120
gallop[0] = 0 ; gallop[1] = 0
gallopInc[0] = 1 ; gallopInc[1] = 1
dInc[0] = 0 ; dInc[1] = 0
puzzle = [5,5]
moveTarget = [1,1] ; movePhase = [0,0]
gameSound[0].play()
showPicture(distance,gallop)
time.sleep(5)
restart = False # show Puzzle
showPicture(distance,gallop)
moveDetect(distance)
if dInc[0] or dInc[1] :
for n in range(0,2):
if dInc[n] :
distance[n] += 3
if dInc[n] :
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dInc[n] -=1
gallop[n] = gallopAdv(gallop,n)
showPicture(distance,gallop)
if checkForFinish(distance):
restart = True
time.sleep(4.0)
def moveDetect(dis):
global dInc, puzzle, moveTarget
move = -1
for n in range(0,2):
move = checkInput(n) # look at ball switch
if move != -1 :
# check if it is a valid move
if move == moveTarget[n] :
if movePhase[n] == 1 : # move complete
dInc[n] = 50 # move this * 3
gameSound[1].play()
last = moveTarget[n]
puzzle[n] = random.randint(0,11)
while last == moveState[puzzle[n]][0] :
puzzle[n] = random.randint(0,11)
moveTarget[n] = moveState[puzzle[n]][0]
movePhase[n] = 0
else :
moveTarget[n] = moveState[puzzle[n]][1]
movePhase[n] = 1
showPicture(dis,gallop) # update move graphic
if n ==0 :
gameSound[4].play()
else :
gameSound[5].play()
def gallopAdv(gallop,n):
global gallopInc
gallop[n] += gallopInc[n]
if gallop[n] > 6 or gallop[n] =winningPost or d[1] >=winningPost:
gameSound[2].play()
finish(d[0] - d[1])
time.sleep(3.0)
return True
else :
return False
def windBack(d):
wind = 4
while d[0] >= -120 or d[1] >= -120:
showPicture(d,gallop)
checkForEvent()
for n in range(0,2):
if d[n] >=-120:
d[n] -= wind
def checkInput(player):
ball = -1
for pin in range(0,4):
if io.digitalRead(ballPins[player][pin]) == 0 :
ball = pin
return ball
54 January 2017
raspberrypi.org/magpi