def test_viewer_at_corner_of_single_image():
offset = 0.2
screen_rect = [1, 1, 1, 1]
new_size = [1-offset, 1-offset]
down_right = [1+offset, 1+offset, 1, 1]
new_rect = trim_screen_rect(screen_rect, down_right, SINGLE_PIXEL)
expected_rect = down_right[:2] + new_size
assert_midpoints_equal((new_rect, expected_rect))
up_left = [1-offset, 1-offset, 1, 1]
new_rect = trim_screen_rect(screen_rect, up_left, SINGLE_PIXEL)
expected_rect = [1, 1] + new_size
assert_midpoints_equal((new_rect, expected_rect))
def test_viewer_at_corner_of_four_pixel_image():
offset = 0.2
screen_rect = [1, 1, 1, 1]
view_rectangles = ([1+offset, 1+offset, 1, 1], # Shifted down and right
[1-offset, 1-offset, 1, 1]) # Shifted up and left
for view_rect in view_rectangles:
new_rect = trim_screen_rect(screen_rect, view_rect, FOUR_PIXELS)
yield assert_equal, new_rect, screen_rect
def test_viewer_zoomed_into_four_pixel_intersection():
screen_rect = [0, 0, 100, 100] # 4-pixel intersection at (50, 50)
view_rectangles = ([49, 49, 2, 2], # Centered pixel intersection
[49, 49, 3, 3], # Intersection at 1/3 of view
[49, 49, 2, 3]) # Intersection at 1/2, 1/3 of view
for view_rect in view_rectangles:
new_rect = trim_screen_rect(screen_rect, view_rect, FOUR_PIXELS)
yield assert_midpoints_equal, (new_rect, screen_rect)
def test_viewer_zoomed_into_single_pixel():
screen_rect = [0, 0, 100, 100]
view_rect = [10, 11, 1, 2]
new_rect = trim_screen_rect(screen_rect, view_rect, SINGLE_PIXEL)
assert_allclose(new_rect, view_rect)