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/** | |
* Constructs a new, empty Sankey layout. Layouts are not typically constructed | |
* directly; instead, they are added to an existing panel via | |
* {@link pv.Mark#add}. | |
* | |
* @class Implements a layout for Sankey diagrams. An Sankey diagram is a directed weighted | |
* network visualization where typically the nodes are ordered into groups/levels and hidden | |
* to simply revel the weighted links between them. | |
* | |
*<p>A typical definition of a Sankey diagram is a directional flow chart where the width of |