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".