Voronoi Transform

The voronoi transform computes a voronoi diagram for a set of input points and returns the computed cell paths. The Voronoi cells can then be used to identify the nearest point for a given value. For example, a Voronoi diagram can be used to automatically select the data point closest to the mouse cursor.

Example

Click (or drag) to add points. Shift-click (or shift-drag) to remove points.

Transform Parameters

Property Type Description
x Field The data field for point x-coordinates.
y Field The data field for point y-coordinates.
extent Array[ ] The clip extent of the Voronoi cells. The extent bounds are specified as an array [[x0, y0], [x1, y1]], where x0 is the left side of the extent, y0 is the top, x1 is the right and y1 is the bottom. For example, [[-1e5, -1e5], [1e5, 1e5]] will clip the voronoi diagram at 10,000 pixels in both the negative and positive directions.
size Number[ ] An alternative to extent that sets the clip extent to [[0,0], size].
as String[ ] The output field for the Voronoi cell SVG path string. The default is path.

Usage

{"type": "voronoi", "x": "layout_x", "y": "layout_y", "as": "cell"}

Computes Voronoi cell paths based on previously computed layout coordinates, and writes the result to the field name "cell".