![]() Polygons are also counterclockwise, assuming the origin ⟨0,0⟩ is in the top-left corner.įor each set of coincident input points, one of the points is chosen arbitrarily and assigned the associated polygon the other coincident input points’ entries are missing from the returned sparse array. Polygons are open: they do not contain a closing point that duplicates the first point a triangle, for example, is an array of three points. Each polygon is represented as an array of points where x and y are the point coordinates, and a data field that refers to the corresponding element in data. Returns a sparse array of polygons clipped to the extent, one for each cell (each unique input point) in the diagram. cells - a sparse array of cells, one for each unique input point.įor each set of coincident input points, one of the points is chosen arbitrarily and assigned the associated cell the other coincident input points’ entries are missing from the returned sparse array.The computed Voronoi diagram returned by voronoi has the following properties: AMD, CommonJS, and vanilla environments are supported. You can also load directly from, either as a standalone library or as part of D3 4.0. Voronoi diagrams can also be used to automate label positioning, and Delaunay meshes are useful in computing adjacency or grouping of visual elements. See “Strikeouts on the Rise” in The New York Times and this multi-line chart for examples also see Tovi Grossman’s paper on bubble cursors for a related technique. Voronoi diagrams are not only visually attractive but practical tools for interaction, such as to increase the target area of points in a scatterplot. This implementation is largely based on work by Raymond Hill. Fortune’s algorithm for computing the Voronoi diagram or Delaunay triangulation of a set of two-dimensional points. Based on Delaunator, d3-delaunay is 5-10× faster than d3-voronoi to construct the Delaunay triangulation or the Voronoi diagram, is more robust numerically, has Canvas rendering built-in, allows traversal of the Delaunay graph, and a variety of other improvements. Deprecation notice: Consider using the newer d3-delaunay instead of d3-voronoi. ![]()
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