snap-points-2d

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

var hlod = require('snap-points-2d')(points, output, outputIds[, bounds])

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

• points is an array of 2*n values
• output is the reordered array of points
• outputIds is the index of the reordered points in the input array
• bounds is an optional array of 4 values giving the bounding box of the points

Returns 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

Note the points in output are rescaled to the unit box [0,1]x[0,1] and the array points in the input is shuffled during execution.

License

(c) 2015 Mikola Lysenko. MIT License