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import leather
def bar_chart(self, label=0, value=1, path=None, width=None, height=None):
"""
Render a bar chart using :class:`leather.Chart`.
:param label:
The name or index of a column to plot as the labels of the chart.
Defaults to the first column in the table.
:param value:
The name or index of a column to plot as the values of the chart.
Defaults to the second column in the table.
:param path:
If specified, the resulting SVG will be saved to this location. If
:code:`None` and running in IPython, then the SVG will be rendered
inline. Otherwise, the SVG data will be returned as a string.
:param width:
The width of the output SVG.
:param height:
The height of the output SVG.
"""
if type(label) is int:
label_name = self.column_names[label]
else:
label_name = label
if type(value) is int:
value_name = self.column_names[value]
else:
value_name = value
chart = leather.Chart()
chart.add_x_axis(name=value_name)
chart.add_y_axis(name=label_name)
chart.add_bars(self, x=value, y=label)
return chart.to_svg(path=path, width=width, height=height)
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