There is no direct relation between the selection and the chart items. When a region is selected, the chart calculates how the selected area is related to the current view and re-calculates the bounds for the axes. Then the chart filters the data, so that only the datapoints, which are within the selection are shown. That said, Vladimir has already explained how to obtain the bounds of the selected region -- these are basically the min and max values of the corresponding axis after the zoom/scroll process.
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