Gets the y 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 may not be in degrees or radians. See AngularAxis.setLabels
on how the angular axis scale is defined.
You must call BaseChart.layout
first before calling this method. ChartDirector needs to perform auto-scaling and layout the axis before it can compute the coordinates.
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