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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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