Gets the x pixel coordinate given the x data value.
This method only accepts numeric values as input. If the axis scale is a date/time scale, and you are using a DateTime value, please use Chart.CTime
to convert it to a number.
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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