def crop_image_GUI (label, x1, y1, x2, y2):
'''Implement the crop_image function from img_manip.'''
#Clear all the temp pics in front of the current pic current_pic
global temp_label
global current_pic
temp_label = temp_label[0:current_pic+1]
#Implement the function crop_image
label.picture = img_manip.crop_image(label.picture, x1, y1, x2, y2)
#Keep a copy of the current pic for the functions Undo and Redo
temp_label.append(label.picture)
current_pic += 1
#update the label
update_label(label)
def test_crop_image():
'''Test the function crop_image in img_manip.'''
new_pic = create_pic(4, 4)
new_pic_cropped = img_manip.crop_image(new_pic, 1, 1, 2, 2)
#Test if the colour of each pixel in new_pic is equal to the colour of the
#corresponding pixel in new_pic_cropped. If not, the boolean cropped is
#made False.
cropped = True
for x in range(2):
for y in range(2):
new_pic_pix = media.get_pixel(new_pic, x + 1, y + 1)
new_pic_cropped_pix = media.get_pixel(new_pic_cropped, x, y)
col1 = media.get_color(new_pic_pix)
col2 = media.get_color(new_pic_cropped_pix)
if col1 != col2:
cropped = False
assert cropped, \
"crop_image failed to crop the picture correctly."
