Gets the x data value given the x pixel coordinate.
This method always returns a numeric value. If the axis scale is a date/time scale, and you are expecting a Date data type, please use ChartDirector.API.NTime
to convert the number to the Date data type.
This method should be used only after ChartDirector has output the chart image, or after XYChart.layoutAxes
has been called. ChartDirector needs to perform auto- scaling and layout the axis before it can convert between pixel coordinates and data values.
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