Get the x pixel coordinate of a point given its radial and angular coordinates.
The radial and angular coordinates are measured using the scale of the radial and angular axes. In particular, the scale of the angular axis is not necessarily in degrees or radians. See
AngularAxis.setLabels and
AngularAxis.setLinearScale on how the angular axis scale is defined.
Note that you must call
BaseChart.layout first before calling this method. It is because ChartDirector needs to perform auto-scaling and/or confirm the axis scale first before it can compute the coordinates.
The x pixel coordinate of the point.
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