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snap-points-2d

v4.0.0

Published

snap round 2d points

Downloads

4,412

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Links

Git

Maintainers

lconnorslconnorsalexshoealexshoet4rkt4rkbronsolobronsolojmmeasejmmeasechriddypchriddypbpostlethwaitebpostlethwaitealexcjohnsonalexcjohnsonnicolaskruchtennicolaskruchtenantrgantrgarchmojarchmojxhluxhluhammadtheonehammadtheonemikolalysenkomikolalysenkojackluojackluoandrefarzatandrefarzatdfcreativedfcreativemaxkfranzmaxkfranzetpinardetpinardrreusserrreusserwilzbachwilzbachmonferamonferamarivetmarivetjackparmerjackparmershannon-lalshannon-lalrmarren1rmarren1verazabeidaverazabeidavniemanvniemandmt0dmt0dydy

Keywords

snaprounditeratedplot2ddatavis

Readme

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 2*n 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