map.ls

<-$
svg = d3.select '#map' .append 'svg:svg'
  .attr 'width' '1440'
  .attr 'height' '700'

g = svg.append 'g'

voronoi_map = g.append 'svg:g'
  .attr 'id' 'voronoi'

circle = [[400 + 100 * Math.cos(i * 3.14 / 180), 300 + 100 * Math.sin(i * 3.14 / 180)] for i to 360]

circle = d3.geom.polygon circle
data = [[450, 350], [410, 360], [470, 310], [420, 320]]
voronoi = d3.geom.voronoi!

voronoi_map.selectAll "path" .data(voronoi data, (d) -> "M#{d.join 'L'}Z" .map (v) -> circle.clip d3.geom.polygon v)
  .enter!append 'path'
  .attr 'd' (d) -> "M#{d.join 'L'}Z"
  .attr 'fill' 'none'
  .attr 'stroke' 'black'