Class hvGridExplorer

hvplot/ui.py:918–1004

class hvGridExplorer(hvPlotExplorer):
    kind = param.Selector(default='image', objects=KINDS['all'])

    def __init__(self, ds, **params):
        import xarray as xr

        var_name_suffix = ''
        if isinstance(ds, xr.Dataset):
            data_vars = list(ds.data_vars)
            if len(data_vars) == 1:
                ds = ds[data_vars[0]]
                var_name_suffix = f"['{data_vars[0]}']"
            else:
                missing_dims = set(ds.dims) - set(ds.coords)
                if missing_dims:
                    # fixes https://github.com/holoviz/hvplot/issues/1272
                    for dim in missing_dims:
                        ds.coords[dim] = np.arange(len(ds[dim]))
                ds = ds.to_array('variable').transpose(..., 'variable')
                var_name_suffix = ".to_array('variable').transpose(..., 'variable')"
        if 'kind' not in params:
            params['kind'] = 'image'
        self._var_name_suffix = var_name_suffix
        super().__init__(ds, **params)

    @property
    def _var_name(self):
        if self._var_name_suffix:
            return f'ds{self._var_name_suffix}'
        else:
            return 'da'

    @property
    def _x(self):
        return (self._converter.x or self._converter.indexes[0]) if self.x is None else self.x

    @property
    def _y(self):
        return (self._converter.y or self._converter.indexes[1]) if self.y is None else self.y

    @param.depends('x')
    def xlim(self):
        try:
            values = self._data[self._x]
        except Exception:
            return 0, 1
        if values.dtype.kind in 'OSU':
            return None
        return (np.nanmin(values), np.nanmax(values))

    @param.depends('y', 'y_multi')
    def ylim(self):
        y = self._y
        if not isinstance(y, list):
            y = [y]
        values = (self._data[y] for y in y)
        return max_range([(np.nanmin(vs), np.nanmax(vs)) for vs in values])