def vertical_reflection_GUI (label):
'''Implement the function vertical_reflection 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 vertical_reflection.
label.picture = img_manip.vertical_reflection(label.picture)
#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_vertical_reflection():
'''Test the function vertical_reflection in img_manip.'''
new_pic = create_pic(4, 4)
new_pic_reflected = img_manip.vertical_reflection(new_pic)
#Test if the colour of each pixel in new_pic_vertical_reflection is equal to
#the colour of the corresponding pixel in new_pic. If not, the boolean
#reflected is made False.
reflected= True
width = media.get_width(new_pic)
height = media.get_height(new_pic)
for x in range(width):
for y in range(height):
pix1 = media.get_pixel(new_pic, x, y)
pix2 = media.get_pixel(new_pic_reflected, x, height - y - 1)
col1 = media.get_color(pix1)
col2 = media.get_color(pix2)
if col1 != col2:
reflected = False
assert reflected, \
"vertical_reflection failed to reflect the image vertically."
