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import unittest | |
def find_overlap(r1, r2, axis, result): | |
if axis is 'x': | |
start = 'x' | |
distance = 'width' | |
elif axis is 'y': | |
start = 'y' | |
distance = 'height' | |
p1 = r1[start] | |
p2 = r2[start] | |
p_start = max(p1, p2) | |
p_end = min(p1 + r1[distance], p2 + r2[distance]) | |
if p_start > p_end: | |
return False | |
result[start] = p_start | |
result[distance] = p_end - p_start | |
return True | |
def find_intersecting_rectangle(r1, r2): | |
""" | |
returns the intersecting rectangle in a dict format | |
""" | |
intersect_rect = {} | |
if find_overlap(r1, r2, 'x', intersect_rect) and \ | |
find_overlap(r1, r2, 'y', intersect_rect): | |
return intersect_rect | |
else: | |
return {} | |
class TestInstersectingRects(unittest.TestCase): | |
def test_overlap(self): | |
r1 = {'x': 0, 'y': 0, 'width': 2, 'height': 2} | |
r2 = {'x': 1, 'y': 1, 'width': 2, 'height': 2} | |
r3 = {'x': 1, 'y': 1, 'width': 1, 'height': 1} | |
self.assertEqual(find_intersecting_rectangle(r1, r2), r3) | |
def test_enclosed(self): | |
r1 = {'x': 0, 'y': 0, 'width': 8, 'height': 8} | |
r2 = {'x': 1, 'y': 1, 'width': 2, 'height': 2} | |
r3 = {'x': 1, 'y': 1, 'width': 2, 'height': 2} | |
self.assertEqual(find_intersecting_rectangle(r1, r2), r3) | |
def test_left_overlap(self): | |
r1 = {'x': 3, 'y': 0, 'width': 5, 'height': 2} | |
r2 = {'x': 0, 'y': 0, 'width': 4, 'height': 2} | |
r3 = {'x': 3, 'y': 0, 'width': 1, 'height': 2} | |
self.assertEqual(find_intersecting_rectangle(r1, r2), r3) | |
def test_right_overlap(self): | |
r1 = {'x': 0, 'y': 0, 'width': 4, 'height': 2} | |
r2 = {'x': 3, 'y': 0, 'width': 5, 'height': 2} | |
r3 = {'x': 3, 'y': 0, 'width': 1, 'height': 2} | |
self.assertEqual(find_intersecting_rectangle(r1, r2), r3) | |
def test_edge_overlap(self): | |
r1 = {'x': 0, 'y': 0, 'width': 3, 'height': 2} | |
r2 = {'x': 3, 'y': 0, 'width': 3, 'height': 2} | |
r3 = {'x': 3, 'y': 0, 'width': 0, 'height': 2} | |
self.assertEqual(find_intersecting_rectangle(r1, r2), r3) | |
def test_overlap_on_point(self): | |
r1 = {'x': 0, 'y': 0, 'width': 1, 'height': 1} | |
r2 = {'x': 1, 'y': 1, 'width': 1, 'height': 1} | |
r3 = {'x': 1, 'y': 1, 'width': 0, 'height': 0} | |
self.assertEqual(find_intersecting_rectangle(r1, r2), r3) | |
def test_no_overlap_xaxis(self): | |
r1 = {'x': 0, 'y': 0, 'width': 1, 'height': 1} | |
r2 = {'x': 3, 'y': 0, 'width': 1, 'height': 1} | |
r3 = {} | |
self.assertEqual(find_intersecting_rectangle(r1, r2), r3) | |
def test_no_overlap_yaxis(self): | |
r1 = {'x': 0, 'y': 0, 'width': 1, 'height': 1} | |
r2 = {'x': 0, 'y': 3, 'width': 1, 'height': 1} | |
r3 = {} | |
self.assertEqual(find_intersecting_rectangle(r1, r2), r3) | |
if __name__ == '__main__': | |
unittest.main() |
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