def rotate_right_GUI (label, degrees):
'''Implement the appropriate rotate right function (90/180/270 degreees
depending on uesr's choice) 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]
#Rotage the image to the right 90, 180 or 270 degrees.
if degrees == '90':
label.picture = img_manip.rotate_left270_right90(label.picture)
elif degrees == '180':
label.picture = img_manip.rotate_left180_right180(label.picture)
elif degrees == '270':
label.picture = img_manip.rotate_left90_right270(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_rotate_left180_right180():
'''Test the function rotate_left180_right180 in img_manip.'''
new_pic = create_pic(4, 4)
new_pic_rotated = img_manip.rotate_left180_right180(new_pic)
#Test if the colour of each pixel in new_pic is equal to the colour of the
#corresponding pixel in new_pic_rotated. If not, the boolean rotated is
#made False.
rotated = True
for x in range(4):
for y in range(4):
new_pic_pix = media.get_pixel(new_pic, x, y)
new_pic_rotated_pix = media.get_pixel(new_pic_rotated, 3 - x, 3 - y)
col1 = media.get_color(new_pic_pix)
col2 = media.get_color(new_pic_rotated_pix)
if col1 != col2:
rotated = False
assert rotated, \
"rotate_left180_right180 failed to rotate the picture correctly."