A simplified path generator for D3. Remove points without losing much information. A drop in replacement for the basic functionality d3.line with the added ability to specify a tolerance.

In the case here:

  var simple = simplePath()
    .tolerance(3)
    .x(function(d){ return dateScale(d.date); })
    .y(function(d){ return valueScale(d.value); })
    

Based on Simplify.js a tiny high-performance JavaScript polyline simplification library by Vladimir Agafonkin, extracted from Leaflet, a JS interactive maps library by the same author.

It uses a combination of Ramer-Douglas-Peucker and Radial Distance algorithms.