function setLargeBackgroundStyle(el, backgroundModel, data) {
    var borderColor = backgroundModel.get('borderColor') || backgroundModel.get('color');
    var itemStyle = backgroundModel.getItemStyle(['color', 'borderColor']);

    el.useStyle(itemStyle);
    el.style.fill = null;
    el.style.stroke = borderColor;
    el.style.lineWidth = data.getLayout('barWidth');
}
Data selectable mixin for chart series.
To eanble data select, option of series must have `selectedMode`.
And each data item will use `selected` to toggle itself selected status