imagecrop.py

#part of the UI

import pygame, sys
from PIL import Image
pygame.init()

def main_run():
	input_loc = 'to_crop.jpg'
	#output_loc = 'out.png'
	screen, px = setup(input_loc)
	left, upper, right, lower = mainLoop(screen, px)
	
	if right < left:
		left, right = right, left
	if lower < upper:
		lower, upper = upper, lower
	
	im = Image.open(input_loc)
	to_crop_width, to_crop_height = im.size
	pygame.display.quit()
		
	return (left, upper, right, lower, to_crop_width, to_crop_height)
	
	
	
def setup(path):
    px = pygame.image.load(path)
    screen = pygame.display.set_mode( px.get_rect()[2:] )
    screen.blit(px, px.get_rect())
    pygame.display.flip()
    return screen, px


backgroundfile = pygame.image.load("progicon.png")	
pygame.display.set_icon(backgroundfile)
pygame.display.set_caption("Crop Window")	
	
	
	
	
def mainLoop(screen, px):
    topleft = bottomright = prior = None
    n=0
    while n!=1:
        for event in pygame.event.get():
            if event.type == pygame.MOUSEBUTTONUP:
                if not topleft:
                    topleft = event.pos
                else:
                    bottomright = event.pos
                    n=1
        if topleft:
            prior = displayImage(screen, px, topleft, prior)
    return ( topleft + bottomright )
	
	
def displayImage(screen, px, topleft, prior):
    # ensure that the rect always has positive width, height
    x, y = topleft
    width =  pygame.mouse.get_pos()[0] - topleft[0]
    height = pygame.mouse.get_pos()[1] - topleft[1]
    if width < 0:
        x += width
        width = abs(width)
    if height < 0:
        y += height
        height = abs(height)

    # eliminate redundant drawing cycles (when mouse isn't moving)
    current = x, y, width, height
    if not (width and height):
        return current
    if current == prior:
        return current

    # draw transparent box and blit it onto canvas
    screen.blit(px, px.get_rect())
    im = pygame.Surface((width, height))
    im.fill((128, 128, 128))
    pygame.draw.rect(im, (32, 32, 32), im.get_rect(), 1)
    im.set_alpha(128)
    screen.blit(im, (x, y))
    pygame.display.flip()

    # return current box extents
    return (x, y, width, height)

	
# a,b,c,d,e,f = main_run()
# print a, b, c, d,e,f