taking picture and preview program for Nakayoshi camera

camera_test.sh_.py

#!/usr/bin/python
# -*0 coding: utf-8 -*-
import RPi.GPIO as GPIO
import time
import picamera
import os
import pygame
import random

# GPIO pin
LeftSh = 17
RightSh = 18
UpSw = 27
RightSw = 22
LowSw = 23
LeftSw = 24
RightLowSw = 10
LeftLowSw = 9

# GPIO setting
GPIO.setmode(GPIO.BCM)
GPIO.setup(RightSh, GPIO.IN, pull_up_down = GPIO.PUD_UP)
GPIO.setup(LeftSh, GPIO.IN, pull_up_down = GPIO.PUD_UP)
GPIO.setup(UpSw, GPIO.IN, pull_up_down = GPIO.PUD_UP)
GPIO.setup(RightSw, GPIO.IN, pull_up_down = GPIO.PUD_UP)
GPIO.setup(LowSw, GPIO.IN, pull_up_down = GPIO.PUD_UP)
GPIO.setup(LeftSw, GPIO.IN, pull_up_down = GPIO.PUD_UP)
GPIO.setup(RightLowSw, GPIO.IN, pull_up_down = GPIO.PUD_UP)
GPIO.setup(LeftLowSw, GPIO.IN, pull_up_down = GPIO.PUD_UP)

pygame.init()

size = (pygame.display.Info().current_w, pygame.display.Info().current_h)
print "Framebuffer size: %d x %d" % (size[0], size[1])
screen = pygame.display.set_mode(size, pygame.FULLSCREEN)

def screen_clear():
	screen.fill((0,0,0))
	pygame.display.update()

def shutter(channel):
	print "shutter"
	screen_clear()
	with picamera.PiCamera() as camera:
		camera.resolution = (1024,768)
		camera.start_preview()
		time.sleep(2) # initialize camera
		camera.capture('./data/cameratest.jpg')	

def preview(channel):
	print "preview"
	img = pygame.image.load("./data/cameratest.jpg").convert()
	img = pygame.transform.scale(img, (pygame.display.Info().current_w, pygame.display.Info().current_h))
	#img = pygame.transform.scale(img, (656,416))
   	screen.blit(img, (0,0))
	pygame.display.update()
    
GPIO.add_event_detect(RightSh, GPIO.FALLING, callback=shutter, bouncetime=300)
GPIO.add_event_detect(LeftSh, GPIO.FALLING, callback=preview, bouncetime=300)

try:
	GPIO.wait_for_edge(UpSw, GPIO.FALLING)
except KeyboardInterrupt:
	GPIO.cleanup()	# clean up GPIO on CTRL+C exit
GPIO.cleanup()		# clean up GPIO on normal exit