when zooming, set_axes_ylim only perform when total_points > 1 to prevent the...
closes #125 (closed)
when zooming, set_axes_ylim only perform when total_points > 1 to prevent the shape of plot collapse into one line.
closes #125 (closed)
when zooming, set_axes_ylim only perform when total_points > 1 to prevent the shape of plot collapse into one line.