def test_hotspot_location_intersecting_radar_lines(self):
"""Verifies that the hotspot_location function behaves correctly
for intersecting radar lines.
"""
# ^
# / |
# / |
# / |
# A B
pt1 = (10.0, 10.0)
dxdy1 = (0.7071, 0.7071)
pt2 = (20.0, 10.0)
dxdy2 = (0, 1)
actual_hotspot_location = hotspot_location(pt1, dxdy1, pt2, dxdy2)
expected_hotspot_location = (20.0, 20.0)
self.assertAlmostEqual(expected_hotspot_location[0],
actual_hotspot_location[0],
msg="Expected hotspot location x-value (%.3f) "
"differs from actual hotspot location x-value (%.3f)"
% (expected_hotspot_location[0],
actual_hotspot_location[0]),
delta=2e-3)
self.assertAlmostEqual(expected_hotspot_location[1],
actual_hotspot_location[1],
msg="Expected hotspot location y-value (%.3f) "
"differs from actual hotspot location y-value (%.3f)"
% (expected_hotspot_location[1],
actual_hotspot_location[1]),
delta=2e-3)
def test_hotspot_location_radar_lines_with_same_direction(self):
"""Verifies that the hotspot_location function behaves correctly
for radar lines that have the same direction.
"""
# These lines should not intersect because they point in the same
# direction.
# ^
# /
# /
# /
# B
#
# ^
# /
# /
# /
# A
pt1 = (10.0, 10.0)
pt2 = (20.0, 20.0)
dxdy = (0.7071, 0.7071)
actual_hotspot_location = hotspot_location(pt1, dxdy, pt2, dxdy)
expected_hotspot_location = None
self.assertEqual(actual_hotspot_location, expected_hotspot_location,
"Expected hotspot_location to return %s, but "
"returned %s instead. pt1 is %s and pt2 is %s, "
"both radar lines have the direction vector %s"
% (None,
actual_hotspot_location,
str(pt1),
str(pt2),
str(dxdy)))
