def mirror_GUI (label, direction):
'''Implement the function mirror_vertical or mirro_horizontal 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 mirror_vertical or mirror_horizontal.
if direction == 'vertical':
label.picture = img_manip.mirror_vertical(label.picture)
else:
label.picture = img_manip.mirror_horizontal(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_mirror_vertical():
'''Test the function mirror_vertical in img_manip.'''
new_pic = create_pic(4, 4)
new_pic_mirror_vertical = img_manip.mirror_vertical(new_pic)
#Test if the colour in each pixel in new_pic_mirror_vertical is equal to
#the colour of the pixel that is its vertical mirror. If not, the boolean
#mirrored is made False.
mirrored = True
width = media.get_width(new_pic_mirror_vertical)
height = media.get_height(new_pic_mirror_vertical)
middle = width / 2
for x in range(middle):
for y in range(height):
pix1 = media.get_pixel(new_pic_mirror_vertical, x, y)
pix2 = media.get_pixel(new_pic_mirror_vertical, width - x - 1, y)
col1 = media.get_color(pix1)
col2 = media.get_color(pix2)
if col1 != col2:
mirrored = False
assert mirrored, \
"mirror_vertical failed to mirror the picture vertically."
