bar
class bar(val x: Number? = null, val y: Number? = null, val alpha: Number? = null, val color: Any? = null, val fill: Any? = null, val width: Number? = null, val size: Number? = null, val colorBy: String? = null, val fillBy: String? = null, val mapping: BarMapping.() -> Unit = {}) : GeomOptions, BarAesthetics, WithColorOption, WithFillOption