Function splitHulls

stackgl_modules/index.js:8548–8556

(hulls, points, event)

}

function splitHulls(hulls, points, event) {
  var splitIdx = bsearch.le(hulls, event, findSplit)
  var hull = hulls[splitIdx]
  var upperIds = hull.upperIds
  var x = upperIds[upperIds.length-1]
  hull.upperIds = [x]
  hulls.splice(splitIdx+1, 0,
    new PartialHull(event.a, event.b, event.idx, [x], upperIds))
}


function mergeHulls(hulls, points, event) {