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- import sympy.plotting.backends.base_backend as base_backend
- from sympy.plotting.series import LineOver1DRangeSeries
- from sympy.plotting.textplot import textplot
- class TextBackend(base_backend.Plot):
- def __init__(self, *args, **kwargs):
- super().__init__(*args, **kwargs)
- def show(self):
- if not base_backend._show:
- return
- if len(self._series) != 1:
- raise ValueError(
- 'The TextBackend supports only one graph per Plot.')
- elif not isinstance(self._series[0], LineOver1DRangeSeries):
- raise ValueError(
- 'The TextBackend supports only expressions over a 1D range')
- else:
- ser = self._series[0]
- textplot(ser.expr, ser.start, ser.end)
- def close(self):
- pass
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