def _update_channels_epochs(event, params):
    from matplotlib.collections import LineCollection
    # Channels
    n_channels = int(np.around(params['channel_slider'].val))
    offset = params['ax'].get_ylim()[0] / n_channels
    params['offsets'] = np.arange(n_channels) * offset + (offset / 2.)
    while len(params['lines']) > n_channels:
        params['ax'].collections.pop()
        params['lines'].pop()
    while len(params['lines']) < n_channels:
        lc = LineCollection(list(), linewidths=0.5, antialiased=False,
                            zorder=3, picker=3.)
        params['ax'].add_collection(lc)
        params['lines'].append(lc)
    params['ax'].set_yticks(params['offsets'])
    params['vsel_patch'].set_height(n_channels)
    params['n_channels'] = n_channels

    # Epochs
    n_epochs = int(np.around(params['epoch_slider'].val))
    n_times = len(params['epochs'].times)
    ticks = params['epoch_times'] + 0.5 * n_times
    params['ax2'].set_xticks(ticks[:n_epochs])
    params['n_epochs'] = n_epochs
    params['duration'] = n_times * n_epochs
    params['hsel_patch'].set_width(params['duration'])
    params['data'] = np.zeros((len(params['data']), params['duration']))
    if params['t_start'] + n_times * n_epochs > len(params['times']):
        params['t_start'] = len(params['times']) - n_times * n_epochs
        params['hsel_patch'].set_x(params['t_start'])
    params['plot_update_proj_callback'](params)
Parse a list of map strings (mappings)
dataset/ETHPy150Open mne-tools/mne-python/mne/viz/epochs.py/_update_channels_epochs--crossover with--dataset/ETHPy150Open resync/resync/resync/mapper.py/Mapper.parse