SunFounder PiArm, Руководство пользователя

Страница: 145 / 163

Piarm, Release 1.0
(continued from previous page)
if flag == True :
t . say( "game start" )
sleep( 60 )
t . say( "three" )
sleep( 1 )
t . say( "two" )
sleep( 1 )
t . say( "one" )
sleep( 1 )
t . say( "game over" )
flag = False
This
timing()
function is used for timing. After prompting the game to start, the game is timed for 60 seconds,
then a countdown of 3, 2, 1 is performed before the game is prompted to end and the
flag
is set to
False
.
def say_shape ():
k = random . randint( 1 , 3 )
if
k == 1 :
t . say( "Round" )
if k == 2 :
t . say( "Triangle" )
if k == 3 :
t . say( "Square" )
This
say_shape()
function is to make PiArm say a random shape.
if __name__ == "__main__" :
print (manual1)
thread1 = threading . Thread(target = timing)
thread1 . start()
while True :
key = readchar() . lower()
if key == 'p' :
print (manual2)
flag = True
sleep( 3 )
say_shape()
if flag == True :
control(key)
if key == chr ( 27 ):
break
print ( "press ctrl+c to quit" )
This is the main flow of the code.
• Print out the key prompt in the terminal and let timing() run in a separate thread.
• Call the readchar() function to read the key value.
• If key
p
is read as being pressed, print out the key prompt and let
flag
be
True
, at which point the
timing()
function starts timing, and after 3 seconds, call the
say_shape()
function to make PiArm say a random shape.
• If
flag
is
True
, call the
control()
function to make the PiArm rotate according to the key value.
•
chr(27)
represents the
Esc
key, and if the
Esc
key is pressed, exit the main loop. This step is because
the
readchar()
function is used to read the keyboard all the time, so you can’t stop the code directly with
4.9. GAME - Iron Collection 141