Function Vector_angle_signed

source/blender/python/mathutils/mathutils_Vector.cc:1225–1265

    "   :return: angle in radians or fallback when given\n"
    "   :rtype: float | Any\n");
static PyObject *Vector_angle_signed(VectorObject *self, PyObject *args)
{
  float tvec[2];

  PyObject *value;
  PyObject *fallback = nullptr;

  if (!PyArg_ParseTuple(args, "O|O:angle_signed", &value, &fallback)) {
    return nullptr;
  }

  if (BaseMath_ReadCallback(self) == -1) {
    return nullptr;
  }

  if (mathutils_array_parse(
          tvec, 2, 2, value, "Vector.angle_signed(other), invalid 'other' arg") == -1)
  {
    return nullptr;
  }

  if (self->vec_num != 2) {
    PyErr_SetString(PyExc_ValueError, "Vector must be 2D");
    return nullptr;
  }

  if (is_zero_v2(self->vec) || is_zero_v2(tvec)) {
    /* avoid exception */
    if (fallback) {
      Py_INCREF(fallback);
      return fallback;
    }

    PyErr_SetString(PyExc_ValueError,
                    "Vector.angle_signed(other): "
                    "zero length vectors have no valid angle");
    return nullptr;
  }

  return PyFloat_FromDouble(angle_signed_v2v2(self->vec, tvec));
}

/** \} */