snap-points-2d

Runs iterative snap rounding on a set of 2D coordinates to produce a hierarchical level of detail for optimizing online rendering of huge 2D plots.

Install

``
npm i snap-points-2d
`

API

#### {levels, ids, weights, points} = require('snap-points-2d')(points, bounds?)

Reorders the points hierarchically such that those which are drawn at the same pixel coordinate are grouped together.

##### Inputs
points is an input array of 2n coordinate values. It is kept untouched.
* bounds is an optional array of 4 bounding box values of the points.

##### Outputs
* points is an output float64 array with reordered an normalized to bounds point values.
* ids is an output uint32 array which gets the reordered index of the points.
* weights is an output uint32 array of point weights (number of points at the same pixel), which can be used for transparent rendering.
* levels is an array of LOD scales. Each record is an object with the following properties:
* pixelSize the pixel size of this level of detail in data units
* offset the offset of this lod within the output array
* count` the number of items in the lod

License

(c) 2015 Mikola Lysenko. MIT License