/// <summary>
/// 取得 Plot 物件
/// </summary>
/// <param name="chart">ZChart 圖表類別</param>
/// <param name="source">資料來源</param>
/// <param name="chartType">圖表類型</param>
/// <returns>回傳值: AbstractPlot 抽象類別</returns>
public override AbstractPlot GetPlot(ZChart chart, object source, ChartSetting chartSetting)
{
return(PlotEngine.Create(this, chart, source, chartSetting));
}