def data():
equation_string = flask.request.args.get('equation')
plotter = FieldPlotter()
plotter.set_equation_from_string(equation_string)
json_data = plotter.json_data()
response = flask.make_response(json_data)
response.mimetype = 'text/json'
return response
def test_set_equation_from_string_fail(self):
equation_str = 'x***y'
plotter = FieldPlotter()
# Test that error is raised when not told to fail silently
with self.assertRaises(sympy.SympifyError):
plotter.set_equation_from_string(equation_str)
# Test silent failure
plotter.set_equation_from_string(equation_str, fail_silently=True)
self.assertIsNone(plotter.equation)
def test_set_equation_from_string(self):
equations = [
'x',
'y',
'x+y',
'2*x',
'x*y',
'x/y',
]
plotter = FieldPlotter()
for equation_str in equations:
plotter.set_equation_from_string(equation_str)
sympy_eq = sympy.sympify(equation_str)
self.assertEqual(plotter.equation, sympy_eq)
def plot():
equation_string = flask.request.args.get('equation')
diff_equation = FieldPlotter()
diff_equation.set_equation_from_string(equation_string)
diff_equation.make_plot()
# If plotting was successful, write plot out
if diff_equation.figure:
# Write output to memory and add to response object
output = StringIO.StringIO()
response = flask.make_response(base64.b64encode(diff_equation.write_data(output)))
response.mimetype = 'image/png'
return response
else:
return flask.make_response('')
def test_set_equation_from_string_timeout(self):
equation_str = '9**9**9**9**9**9'
plotter = FieldPlotter()
plotter.set_equation_from_string(equation_str)
self.assertIsNone(plotter.equation)