Gets the x pixel coordinate of a point given the x data value.
Note: You must call
BaseChart.layout first before calling this method. It is because ChartDirector needs to perform auto-scaling and determine the axis scale first before it can compute the coordinates.
For a 3D chart, this method will get the pixel coordinate of the data value on the top surface of the chart. Use
Layer.getXCoor to obtain the pixel coordinate of the data value on a particular chart layer.
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