[C#]	public int getColor(double z);
[VB]	Public Function getColor(z As Double) As Integer

Gets the color given the data value.

Note: You must call XYChart.layoutAxes, BaseChart.layout or XYChart.packPlotArea first before calling this method. ChartDirector needs to perform auto-scaling and layout the axis before it can compute the color.

The color that corresponds to the data value.