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import math
from decimal import Decimal
from django.db.models.functions import ATan2
from django.test import TestCase
from ..models import DecimalModel, FloatModel, IntegerModel
class ATan2Tests(TestCase):
def test_null(self):
IntegerModel.objects.create(big=100)
obj = IntegerModel.objects.annotate(
null_atan2_sn=ATan2('small', 'normal'),
null_atan2_nb=ATan2('normal', 'big'),
).first()
self.assertIsNone(obj.null_atan2_sn)
self.assertIsNone(obj.null_atan2_nb)
def test_decimal(self):
DecimalModel.objects.create(n1=Decimal('-9.9'), n2=Decimal('4.6'))
obj = DecimalModel.objects.annotate(n_atan2=ATan2('n1', 'n2')).first()
self.assertIsInstance(obj.n_atan2, Decimal)
self.assertAlmostEqual(obj.n_atan2, Decimal(math.atan2(obj.n1, obj.n2)))
def test_float(self):
FloatModel.objects.create(f1=-25, f2=0.33)
obj = FloatModel.objects.annotate(f_atan2=ATan2('f1', 'f2')).first()
self.assertIsInstance(obj.f_atan2, float)
self.assertAlmostEqual(obj.f_atan2, math.atan2(obj.f1, obj.f2))
def test_integer(self):
IntegerModel.objects.create(small=0, normal=1, big=10)
obj = IntegerModel.objects.annotate(
atan2_sn=ATan2('small', 'normal'),
atan2_nb=ATan2('normal', 'big'),
).first()
self.assertIsInstance(obj.atan2_sn, float)
self.assertIsInstance(obj.atan2_nb, float)
self.assertAlmostEqual(obj.atan2_sn, math.atan2(obj.small, obj.normal))
self.assertAlmostEqual(obj.atan2_nb, math.atan2(obj.normal, obj.big))
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