Whether every line of a layer is plotted against an upside-down value axis.
A rank axis runs the other way: first place is the smallest number and sits
at the top, which amCharts draws by inverting the axis' renderer. That is the
one thing a bump chart declares about itself, and it is asked of every series
rather than of any — a chart mixing an inversed line with an ordinary one is
not a table of ranks, and reading it as one would invert the pitch of both.
It is not sufficient on its own. An inversed axis is also how a plain chart
of descending magnitudes is drawn, so holdsRanks has to agree before
the layer is announced as a bump chart.
Whether every line of a layer is plotted against an upside-down value axis.
A rank axis runs the other way: first place is the smallest number and sits at the top, which amCharts draws by inverting the axis' renderer. That is the one thing a bump chart declares about itself, and it is asked of every series rather than of any — a chart mixing an inversed line with an ordinary one is not a table of ranks, and reading it as one would invert the pitch of both.
It is not sufficient on its own. An inversed axis is also how a plain chart of descending magnitudes is drawn, so holdsRanks has to agree before the layer is announced as a bump chart.