Programming Joystick gaming with Raspberry pi
Install joystick using the command below:
sudo apt-get install joystick
after installation you can find file js0 in the directory:
/dev/input/
sudo cat /dev/input/js0
sudo cat /dev/input/js0 | hexdump
Pygame program to read joystick buttons
joystick = pg.joystick.Joystick(0)
joystick.init()
pg.joystick.joystick(0) returns the joystick object and init() function initialize the device values.
button1 = joystick.get_button(0) retrives the button(0)
below program includes functions to read the keyboard input and mouse inputs.
Pygame Joystick program:
import pygame as pg
# initialize pygame
pg.init()
# use an image you have (.bmp .jpg .png .gif)
image_file = "ball"
# RGB color tuple for screen background
black = (0,0,0)
# screen width and height
sw = 640
sh = 480
# create a screen
screen = pg.display.set_mode((sw, sh))
# give the screen a title
pg.display.set_caption('image follows mouse click position')
# load an image
# convert() unifies the pixel format for faster blit
image = pg.image.load(image_file).convert()
# get the rectangle the image occupies
# rec(x, y, w, h)
start_rect = image.get_rect()
image_rect = start_rect
running = True
joystick = pg.joystick.Joystick(0)
joystick.init()
while running:
event = pg.event.poll()
keyinput = pg.key.get_pressed()
button3 = joystick.get_button(2)
button1 = joystick.get_button(0)
# exit on corner 'x' click or escape key press
if keyinput[pg.K_ESCAPE]:
raise SystemExit
elif event.type == pg.QUIT:
running = False
elif keyinput[pg.K_LEFT]:
image_rect.left = image_rect.left - 1
image_rect.right = image_rect.right-1
print "corner coordinates --> (%d, %d, %d, %d)" % \
(image_rect.left, image_rect.top, image_rect.right,
image_rect.bottom)
screen.fill(black)
elif keyinput[pg.K_RIGHT]:
image_rect.left = image_rect.left + 1
image_rect.right = image_rect.right+1
screen.fill(black)
screen.blit(image, image_rect)
pg.display.flip()
elif keyinput[pg.K_DOWN]:
image_rect.top = image_rect.top + 1
image_rect.bottom = image_rect.bottom+1
screen.fill(black)
screen.blit(image, image_rect)
pg.display.flip()
elif keyinput[pg.K_UP]:
image_rect.top = image_rect.top - 1
image_rect.bottom = image_rect.bottom-1
screen.fill(black)
screen.blit(image, image_rect)
pg.display.flip()
elif button3:
print("Joystick up pressed")
image_rect.top = image_rect.top - 1
image_rect.bottom = image_rect.bottom-1
screen.fill(black)
screen.blit(image, image_rect)
pg.display.flip()
elif button1:
print("Joystick down pressed")
image_rect.top = image_rect.top + 1
image_rect.bottom = image_rect.bottom+1
screen.fill(black)
screen.blit(image, image_rect)
pg.display.flip()
Pygame built with Raspberry Pi & Joystick
