The highlight box for one source row, in chart-element pixels and clipped to its pane, or null when none of it is on screen -- a bar scrolled out of view, or a pane not laid out.
The chart
The series the row belongs to
The row
The box to draw, or null
The highlight box for one source row, in chart-element pixels and clipped to its pane, or null when none of it is on screen -- a bar scrolled out of view, or a pane not laid out.