Gets the top y pixel coordinate of the box.
In some cases, the top y coordinate of a box may be dynamically determined. An example is the top y coordinate of an
LegendBox with alignment set to
Center. To determine the top y coordinate, the size of the box must be known first. For these cases, the top y coordinate is undefined until the legend box or the entire chart has been laid out (using
BaseChart.layout or
BaseChart.layoutLegend), or the chart image has been drawn (eg. using
BaseChart.makeChart or
BaseChart.makeChart2).
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