requirebin sketch

index.js

var Delaunator = require('delaunator')
var Simplex = require('perlin-simplex')
var simplex = new Simplex()

var SPEED = 0.5
var N_POINTS = 200

var width = 0.75 * window.innerWidth
var height = 0.75 * window.innerHeight

document.body.style.background = 'rgb(20, 20, 20)'

var points = createPoints(N_POINTS, width, height)

points.forEach(function (point) {
  // document.body.appendChild(point.el)
})

var parent = document.createElement('div')
parent.style.position = 'absolute'
parent.style.top = 0.125 * window.innerHeight + 'px'
parent.style.left = 0.125 * window.innerWidth + 'px'
document.body.appendChild(parent)
var triangles = createTrianges(points)
parent.appendChild(triangles.el)

window.requestAnimationFrame(updateLoop)

function updateLoop () {
  window.requestAnimationFrame(updateLoop)
  points.forEach(function (point, i) {
    // var theta = (0.5 - Math.random()) * (Math.PI / 16)
    var x = point.x / 40
    var y = point.y / 40
    var z = Date.now() / 10000
    var s = simplex.noise3d(x, y, z)
    // var s = simplex.noise(x, y)
    var theta1 = s * (2 * Math.PI)
    var theta = (0.01 * theta1) + (0.99 * point.theta)
    // if (i === 0) console.log(s, theta)
    point.move(theta, SPEED)
  })
  triangles.update(points)
}

function createPoints (n, w, h) {
  var points = []

  var x, y
  for (var i = 0; i < n; i++) {
    x = Math.floor(Math.random() * w)
    y = Math.floor(Math.random() * h)
    points.push(createPoint([x, y]))
  }

  return points
}

function createPoint (coords) {
  var w = 20
  var h = w

  var el = document.createElement('div')
  el.style.position = 'absolute'
  el.style.left = coords[0] + 'px'
  el.style.top = coords[1] + 'px'
  el.style.width = w + 'px'
  el.style.height = h + 'px'
  el.style.borderRadius = w / 2 + 'px'
  el.style.background = '#aaa'

  var point = {
    el: el,
    x: coords[0],
    y: coords[1],
    theta: Math.random() * 2 * Math.PI,
    move: move
  }

  return point
}

function mod (a, n) {
  return ((a % n) + n) % n
}

function move (theta, r) {
  this.theta = theta
  this.x += r * Math.cos(this.theta)
  this.y += r * Math.sin(this.theta)

  this.x = mod(this.x, width)
  this.y = mod(this.y, height)

  this.el.style.left = this.x + 'px'
  this.el.style.top = this.y + 'px'
}

function createTrianges (points) {
  var stroke = '#ccc'
  var fill = 'rgba(0,0,0,0)'
  var viewBox = [0, 0, width, height].join(' ')

  var pathData = createPathData(points)

  var parent = document.createElement('div')
  parent.innerHTML = `
    <svg xmlns='http://www.w3.org/svg/2000'
      viewBox='${viewBox}'
      width=${width}
      height=${height}
      stroke='${stroke}'
      fill='${fill}'>
      <path d='${pathData}' />
    </svg>
  `
  return {
    el: parent,
    path: parent.querySelector('path'),
    update: update
  }
}

function createPathData (points) {
  var coords = points.map(function (point) {
    return [point.x, point.y]
  })

  var triangles = new Delaunator(coords).triangles

  var pathData = []

  var x0, y0, x1, y1, x2, y2
  for (var i = 0; i < triangles.length; i += 3) {
    x0 = coords[triangles[i]][0]
    y0 = coords[triangles[i]][1]
    x1 = coords[triangles[i + 1]][0]
    y1 = coords[triangles[i + 1]][1]
    x2 = coords[triangles[i + 2]][0]
    y2 = coords[triangles[i + 2]][1]
    pathData.push(['M', x0, y0].join(' '))
    pathData.push(['L', x1, y1].join(' '))
    pathData.push(['L', x2, y2].join(' '))
    pathData.push(['L', x0, y0].join(' '))
  }

  return pathData.join(' ')
}

function update (points) {
  this.path.setAttribute('d', createPathData(points))
}

minified.js

setTimeout(function(){
;require=(function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require=="function"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error("Cannot find module '"+o+"'");throw f.code="MODULE_NOT_FOUND",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require=="function"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})({"delaunator":[function(require,module,exports){
'use strict';

module.exports = Delaunator;

function Delaunator(points, getX, getY) {

    if (!getX) getX = defaultGetX;
    if (!getY) getY = defaultGetY;

    var minX = Infinity;
    var minY = Infinity;
    var maxX = -Infinity;
    var maxY = -Infinity;

    var coords = this.coords = [];
    var ids = this.ids = new Uint32Array(points.length);

    for (var i = 0; i < points.length; i++) {
        var p = points[i];
        var x = getX(p);
        var y = getY(p);
        ids[i] = i;
        coords[2 * i] = x;
        coords[2 * i + 1] = y;
        if (x < minX) minX = x;
        if (y < minY) minY = y;
        if (x > maxX) maxX = x;
        if (y > maxY) maxY = y;
    }

    var cx = (minX + maxX) / 2;
    var cy = (minY + maxY) / 2;

    var minDist = Infinity;
    var i0, i1, i2;

    // pick a seed point close to the centroid
    for (i = 0; i < points.length; i++) {
        var d = dist(cx, cy, coords[2 * i], coords[2 * i + 1]);
        if (d < minDist) {
            i0 = i;
            minDist = d;
        }
    }

    minDist = Infinity;

    // find the point closest to the seed
    for (i = 0; i < points.length; i++) {
        if (i === i0) continue;
        d = dist(coords[2 * i0], coords[2 * i0 + 1], coords[2 * i], coords[2 * i + 1]);
        if (d < minDist && d > 0) {
            i1 = i;
            minDist = d;
        }
    }

    var minRadius = Infinity;

    // find the third point which forms the smallest circumcircle with the first two
    for (i = 0; i < points.length; i++) {
        if (i === i0 || i === i1) continue;

        var r = circumradius(
            coords[2 * i0], coords[2 * i0 + 1],
            coords[2 * i1], coords[2 * i1 + 1],
            coords[2 * i], coords[2 * i + 1]);

        if (r < minRadius) {
            i2 = i;
            minRadius = r;
        }
    }

    if (minRadius === Infinity) {
        throw new Error('No Delaunay triangulation exists for this input.');
    }

    // swap the order of the seed points for counter-clockwise orientation
    if (area(coords[2 * i0], coords[2 * i0 + 1],
             coords[2 * i1], coords[2 * i1 + 1],
             coords[2 * i2], coords[2 * i2 + 1]) < 0) {

        var tmp = i1;
        i1 = i2;
        i2 = tmp;
    }

    var i0x = coords[2 * i0];
    var i0y = coords[2 * i0 + 1];
    var i1x = coords[2 * i1];
    var i1y = coords[2 * i1 + 1];
    var i2x = coords[2 * i2];
    var i2y = coords[2 * i2 + 1];

    var center = circumcenter(i0x, i0y, i1x, i1y, i2x, i2y);
    this._cx = center.x;
    this._cy = center.y;

    // sort the points by distance from the seed triangle circumcenter
    quicksort(ids, coords, 0, ids.length - 1, center.x, center.y);

    // initialize a hash table for storing edges of the advancing convex hull
    this._hashSize = Math.ceil(Math.sqrt(points.length));
    this._hash = [];
    for (i = 0; i < this._hashSize; i++) this._hash[i] = null;

    // initialize a circular doubly-linked list that will hold an advancing convex hull
    var e = this.hull = insertNode(coords, i0);
    this._hashEdge(e);
    e.t = 0;
    e = insertNode(coords, i1, e);
    this._hashEdge(e);
    e.t = 1;
    e = insertNode(coords, i2, e);
    this._hashEdge(e);
    e.t = 2;

    var maxTriangles = 2 * points.length - 5;
    var triangles = this.triangles = new Uint32Array(maxTriangles * 3);
    triangles[0] = i0;
    triangles[1] = i1;
    triangles[2] = i2;
    this.trianglesLen = 3;

    var adjacent = this.adjacent = new Int32Array(maxTriangles * 3);
    adjacent[0] = -1;
    adjacent[1] = -1;
    adjacent[2] = -1;

    var xp, yp;
    for (var k = 0; k < ids.length; k++) {
        i = ids[k];
        x = coords[2 * i];
        y = coords[2 * i + 1];

        // skip duplicate points
        if (x === xp && y === yp) continue;
        xp = x;
        yp = y;

        // skip seed triangle points
        if ((x === i0x && y === i0y) ||
            (x === i1x && y === i1y) ||
            (x === i2x && y === i2y)) continue;

        // find a visible edge on the convex hull using edge hash
        var startKey = this._hashKey(x, y);
        var key = startKey;
        var start;
        do {
            start = this._hash[key];
            key = (key + 1) % this._hashSize;
        } while ((!start || start.removed) && key !== startKey);

        e = start;
        while (area(x, y, e.x, e.y, e.next.x, e.next.y) >= 0) {
            e = e.next;
            if (e === start) {
                throw new Error('Something is wrong with the input points.');
            }
        }

        var walkBack = e === start;

        // add the first triangle from the point
        var t = this._addTriangle(i, e);
        adjacent[t] = -1;
        adjacent[t + 1] = -1;
        this._link(t + 2, e.t);

        e.t = t; // keep track of boundary triangles on the hull
        e = insertNode(coords, i, e);

        // recursively flip triangles from the point until they satisfy the Delaunay condition
        e.t = this._legalize(t + 2);

        // walk forward through the hull, adding more triangles and flipping recursively
        var q = e.next;
        while (area(x, y, q.x, q.y, q.next.x, q.next.y) < 0) {

            t = this._addTriangle(i, q);
            this._link(t, q.prev.t);
            adjacent[t + 1] = -1;
            this._link(t + 2, q.t);

            q.prev.t = this._legalize(t + 2);

            this.hull = removeNode(q);
            q = q.next;
        }

        if (walkBack) {
            // walk backward from the other side, adding more triangles and flipping
            q = e.prev;
            while (area(x, y, q.prev.x, q.prev.y, q.x, q.y) < 0) {

                t = this._addTriangle(i, q.prev);
                adjacent[t] = -1;
                this._link(t + 1, q.t);
                this._link(t + 2, q.prev.t);

                this._legalize(t + 2);

                q.prev.t = t;
                this.hull = removeNode(q);
                q = q.prev;
            }
        }

        // save the two new edges in the hash table
        this._hashEdge(e);
        this._hashEdge(e.prev);
    }

    // trim typed triangle mesh arrays
    this.triangles = triangles.subarray(0, this.trianglesLen);
    this.adjacent = adjacent.subarray(0, this.trianglesLen);
}

Delaunator.prototype = {

    _hashEdge: function (e) {
        this._hash[this._hashKey(e.x, e.y)] = e;
    },

    _hashKey: function (x, y) {
        var dx = x - this._cx;
        var dy = y - this._cy;
        // use pseudo-angle: a measure that monotonically increases
        // with real angle, but doesn't require expensive trigonometry
        var p = 1 - dx / (Math.abs(dx) + Math.abs(dy));
        return Math.floor((2 + (dy < 0 ? -p : p)) * (this._hashSize / 4));
    },

    _legalize: function (a) {
        var triangles = this.triangles;
        var coords = this.coords;
        var adjacent = this.adjacent;

        var b = adjacent[a];

        var a0 = a - a % 3;
        var b0 = b - b % 3;

        var al = a0 + (a + 1) % 3;
        var ar = a0 + (a + 2) % 3;
        var br = b0 + (b + 1) % 3;
        var bl = b0 + (b + 2) % 3;

        var p0 = triangles[ar];
        var pr = triangles[a];
        var pl = triangles[al];
        var p1 = triangles[bl];

        var illegal = inCircle(
            coords[2 * p0], coords[2 * p0 + 1],
            coords[2 * pr], coords[2 * pr + 1],
            coords[2 * pl], coords[2 * pl + 1],
            coords[2 * p1], coords[2 * p1 + 1]);

        if (illegal) {
            triangles[a] = p1;
            triangles[b] = p0;

            this._link(a, adjacent[bl]);
            this._link(b, adjacent[ar]);
            this._link(ar, bl);

            this._legalize(a);
            return this._legalize(br);
        }

        return ar;
    },

    _link: function (a, b) {
        this.adjacent[a] = b;
        if (b !== -1) this.adjacent[b] = a;
    },

    _addTriangle(i, e) {
        var t = this.trianglesLen;
        this.triangles[t] = e.i;
        this.triangles[t + 1] = i;
        this.triangles[t + 2] = e.next.i;
        this.trianglesLen += 3;
        return t;
    }
};

function dist(ax, ay, bx, by) {
    var dx = ax - bx;
    var dy = ay - by;
    return dx * dx + dy * dy;
}

function area(px, py, qx, qy, rx, ry) {
    return (qy - py) * (rx - qx) - (qx - px) * (ry - qy);
}

function inCircle(ax, ay, bx, by, cx, cy, px, py) {
    ax -= px;
    ay -= py;
    bx -= px;
    by -= py;
    cx -= px;
    cy -= py;

    var ap = ax * ax + ay * ay;
    var bp = bx * bx + by * by;
    var cp = cx * cx + cy * cy;

    var det = ax * (by * cp - bp * cy) -
              ay * (bx * cp - bp * cx) +
              ap * (bx * cy - by * cx);

    return det < 0;
}

function circumradius(ax, ay, bx, by, cx, cy) {
    bx -= ax;
    by -= ay;
    cx -= ax;
    cy -= ay;

    var bl = bx * bx + by * by;
    var cl = cx * cx + cy * cy;

    if (bl === 0 || cl === 0) return Infinity;

    var d = bx * cy - by * cx;
    if (d === 0) return Infinity;

    var x = (cy * bl - by * cl) * 0.5 / d;
    var y = (bx * cl - cx * bl) * 0.5 / d;

    return x * x + y * y;
}

function circumcenter(ax, ay, bx, by, cx, cy) {
    bx -= ax;
    by -= ay;
    cx -= ax;
    cy -= ay;

    var bl = bx * bx + by * by;
    var cl = cx * cx + cy * cy;

    var d = bx * cy - by * cx;

    var x = (cy * bl - by * cl) * 0.5 / d;
    var y = (bx * cl - cx * bl) * 0.5 / d;

    return {
        x: ax + x,
        y: ay + y
    };
}

// create a new node in a doubly linked list
function insertNode(coords, i, prev) {
    var node = {
        i: i,
        x: coords[2 * i],
        y: coords[2 * i + 1],
        t: 0,
        prev: null,
        next: null,
        removed: false
    };

    if (!prev) {
        node.prev = node;
        node.next = node;

    } else {
        node.next = prev.next;
        node.prev = prev;
        prev.next.prev = node;
        prev.next = node;
    }
    return node;
}

function removeNode(node) {
    node.prev.next = node.next;
    node.next.prev = node.prev;
    node.removed = true;
    return node.prev;
}

function quicksort(ids, coords, left, right, cx, cy) {
    var i, j, temp;

    if (right - left <= 20) {
        for (i = left + 1; i <= right; i++) {
            temp = ids[i];
            j = i - 1;
            while (j >= left && compare(coords, ids[j], temp, cx, cy) > 0) ids[j + 1] = ids[j--];
            ids[j + 1] = temp;
        }
    } else {
        var median = (left + right) >> 1;
        i = left + 1;
        j = right;
        swap(ids, median, i);
        if (compare(coords, ids[left], ids[right], cx, cy) > 0) swap(ids, left, right);
        if (compare(coords, ids[i], ids[right], cx, cy) > 0) swap(ids, i, right);
        if (compare(coords, ids[left], ids[i], cx, cy) > 0) swap(ids, left, i);

        temp = ids[i];
        while (true) {
            do i++; while (compare(coords, ids[i], temp, cx, cy) < 0);
            do j--; while (compare(coords, ids[j], temp, cx, cy) > 0);
            if (j < i) break;
            swap(ids, i, j);
        }
        ids[left + 1] = ids[j];
        ids[j] = temp;

        if (right - i + 1 >= j - left) {
            quicksort(ids, coords, i, right, cx, cy);
            quicksort(ids, coords, left, j - 1, cx, cy);
        } else {
            quicksort(ids, coords, left, j - 1, cx, cy);
            quicksort(ids, coords, i, right, cx, cy);
        }
    }
}

function compare(coords, i, j, cx, cy) {
    var d1 = dist(coords[2 * i], coords[2 * i + 1], cx, cy);
    var d2 = dist(coords[2 * j], coords[2 * j + 1], cx, cy);
    return (d1 - d2) || (coords[2 * i] - coords[2 * j]) || (coords[2 * i + 1] - coords[2 * j + 1]);
}

function swap(arr, i, j) {
    var tmp = arr[i];
    arr[i] = arr[j];
    arr[j] = tmp;
}

function defaultGetX(p) {
    return p[0];
}
function defaultGetY(p) {
    return p[1];
}

},{}]},{},[])
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e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require==\"function\"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error(\"Cannot find module '\"+o+\"'\");throw f.code=\"MODULE_NOT_FOUND\",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require==\"function\"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})","'use strict';\n\nmodule.exports = Delaunator;\n\nfunction Delaunator(points, getX, getY) {\n\n    if (!getX) getX = defaultGetX;\n    if (!getY) getY = defaultGetY;\n\n    var minX = Infinity;\n    var minY = Infinity;\n    var maxX = -Infinity;\n    var maxY = -Infinity;\n\n    var coords = this.coords = [];\n    var ids = this.ids = new Uint32Array(points.length);\n\n    for (var i = 0; i < points.length; i++) {\n        var p = points[i];\n        var x = getX(p);\n        var y = getY(p);\n        ids[i] = i;\n        coords[2 * i] = x;\n        coords[2 * i + 1] = y;\n        if (x < minX) minX = x;\n        if (y < minY) minY = y;\n        if (x > maxX) maxX = x;\n        if (y > maxY) maxY = y;\n    }\n\n    var cx = (minX + maxX) / 2;\n    var cy = (minY + maxY) / 2;\n\n    var minDist = Infinity;\n    var i0, i1, i2;\n\n    // pick a seed point close to the centroid\n    for (i = 0; i < points.length; i++) {\n        var d = dist(cx, cy, coords[2 * i], coords[2 * i + 1]);\n        if (d < minDist) {\n            i0 = i;\n            minDist = d;\n        }\n    }\n\n    minDist = Infinity;\n\n    // find the point closest to the seed\n    for (i = 0; i < points.length; i++) {\n        if (i === i0) continue;\n        d = dist(coords[2 * i0], coords[2 * i0 + 1], coords[2 * i], coords[2 * i + 1]);\n        if (d < minDist && d > 0) {\n            i1 = i;\n            minDist = d;\n        }\n    }\n\n    var minRadius = Infinity;\n\n    // find the third point which forms the smallest circumcircle with the first two\n    for (i = 0; i < points.length; i++) {\n        if (i === i0 || i === i1) continue;\n\n        var r = circumradius(\n            coords[2 * i0], coords[2 * i0 + 1],\n            coords[2 * i1], coords[2 * i1 + 1],\n            coords[2 * i], coords[2 * i + 1]);\n\n        if (r < minRadius) {\n            i2 = i;\n            minRadius = r;\n        }\n    }\n\n    if (minRadius === Infinity) {\n        throw new Error('No Delaunay triangulation exists for this input.');\n    }\n\n    // swap the order of the seed points for counter-clockwise orientation\n    if (area(coords[2 * i0], coords[2 * i0 + 1],\n             coords[2 * i1], coords[2 * i1 + 1],\n             coords[2 * i2], coords[2 * i2 + 1]) < 0) {\n\n        var tmp = i1;\n        i1 = i2;\n        i2 = tmp;\n    }\n\n    var i0x = coords[2 * i0];\n    var i0y = coords[2 * i0 + 1];\n    var i1x = coords[2 * i1];\n    var i1y = coords[2 * i1 + 1];\n    var i2x = coords[2 * i2];\n    var i2y = coords[2 * i2 + 1];\n\n    var center = circumcenter(i0x, i0y, i1x, i1y, i2x, i2y);\n    this._cx = center.x;\n    this._cy = center.y;\n\n    // sort the points by distance from the seed triangle circumcenter\n    quicksort(ids, coords, 0, ids.length - 1, center.x, center.y);\n\n    // initialize a hash table for storing edges of the advancing convex hull\n    this._hashSize = Math.ceil(Math.sqrt(points.length));\n    this._hash = [];\n    for (i = 0; i < this._hashSize; i++) this._hash[i] = null;\n\n    // initialize a circular doubly-linked list that will hold an advancing convex hull\n    var e = this.hull = insertNode(coords, i0);\n    this._hashEdge(e);\n    e.t = 0;\n    e = insertNode(coords, i1, e);\n    this._hashEdge(e);\n    e.t = 1;\n    e = insertNode(coords, i2, e);\n    this._hashEdge(e);\n    e.t = 2;\n\n    var maxTriangles = 2 * points.length - 5;\n    var triangles = this.triangles = new Uint32Array(maxTriangles * 3);\n    triangles[0] = i0;\n    triangles[1] = i1;\n    triangles[2] = i2;\n    this.trianglesLen = 3;\n\n    var adjacent = this.adjacent = new Int32Array(maxTriangles * 3);\n    adjacent[0] = -1;\n    adjacent[1] = -1;\n    adjacent[2] = -1;\n\n    var xp, yp;\n    for (var k = 0; k < ids.length; k++) {\n        i = ids[k];\n        x = coords[2 * i];\n        y = coords[2 * i + 1];\n\n        // skip duplicate points\n        if (x === xp && y === yp) continue;\n        xp = x;\n        yp = y;\n\n        // skip seed triangle points\n        if ((x === i0x && y === i0y) ||\n            (x === i1x && y === i1y) ||\n            (x === i2x && y === i2y)) continue;\n\n        // find a visible edge on the convex hull using edge hash\n        var startKey = this._hashKey(x, y);\n        var key = startKey;\n        var start;\n        do {\n            start = this._hash[key];\n            key = (key + 1) % this._hashSize;\n        } while ((!start || start.removed) && key !== startKey);\n\n        e = start;\n        while (area(x, y, e.x, e.y, e.next.x, e.next.y) >= 0) {\n            e = e.next;\n            if (e === start) {\n                throw new Error('Something is wrong with the input points.');\n            }\n        }\n\n        var walkBack = e === start;\n\n        // add the first triangle from the point\n        var t = this._addTriangle(i, e);\n        adjacent[t] = -1;\n        adjacent[t + 1] = -1;\n        this._link(t + 2, e.t);\n\n        e.t = t; // keep track of boundary triangles on the hull\n        e = insertNode(coords, i, e);\n\n        // recursively flip triangles from the point until they satisfy the Delaunay condition\n        e.t = this._legalize(t + 2);\n\n        // walk forward through the hull, adding more triangles and flipping recursively\n        var q = e.next;\n        while (area(x, y, q.x, q.y, q.next.x, q.next.y) < 0) {\n\n            t = this._addTriangle(i, q);\n            this._link(t, q.prev.t);\n            adjacent[t + 1] = -1;\n            this._link(t + 2, q.t);\n\n            q.prev.t = this._legalize(t + 2);\n\n            this.hull = removeNode(q);\n            q = q.next;\n        }\n\n        if (walkBack) {\n            // walk backward from the other side, adding more triangles and flipping\n            q = e.prev;\n            while (area(x, y, q.prev.x, q.prev.y, q.x, q.y) < 0) {\n\n                t = this._addTriangle(i, q.prev);\n                adjacent[t] = -1;\n                this._link(t + 1, q.t);\n                this._link(t + 2, q.prev.t);\n\n                this._legalize(t + 2);\n\n                q.prev.t = t;\n                this.hull = removeNode(q);\n                q = q.prev;\n            }\n        }\n\n        // save the two new edges in the hash table\n        this._hashEdge(e);\n        this._hashEdge(e.prev);\n    }\n\n    // trim typed triangle mesh arrays\n    this.triangles = triangles.subarray(0, this.trianglesLen);\n    this.adjacent = adjacent.subarray(0, this.trianglesLen);\n}\n\nDelaunator.prototype = {\n\n    _hashEdge: function (e) {\n        this._hash[this._hashKey(e.x, e.y)] = e;\n    },\n\n    _hashKey: function (x, y) {\n        var dx = x - this._cx;\n        var dy = y - this._cy;\n        // use pseudo-angle: a measure that monotonically increases\n        // with real angle, but doesn't require expensive trigonometry\n        var p = 1 - dx / (Math.abs(dx) + Math.abs(dy));\n        return Math.floor((2 + (dy < 0 ? -p : p)) * (this._hashSize / 4));\n    },\n\n    _legalize: function (a) {\n        var triangles = this.triangles;\n        var coords = this.coords;\n        var adjacent = this.adjacent;\n\n        var b = adjacent[a];\n\n        var a0 = a - a % 3;\n        var b0 = b - b % 3;\n\n        var al = a0 + (a + 1) % 3;\n        var ar = a0 + (a + 2) % 3;\n        var br = b0 + (b + 1) % 3;\n        var bl = b0 + (b + 2) % 3;\n\n        var p0 = triangles[ar];\n        var pr = triangles[a];\n        var pl = triangles[al];\n        var p1 = triangles[bl];\n\n        var illegal = inCircle(\n            coords[2 * p0], coords[2 * p0 + 1],\n            coords[2 * pr], coords[2 * pr + 1],\n            coords[2 * pl], coords[2 * pl + 1],\n            coords[2 * p1], coords[2 * p1 + 1]);\n\n        if (illegal) {\n            triangles[a] = p1;\n            triangles[b] = p0;\n\n            this._link(a, adjacent[bl]);\n            this._link(b, adjacent[ar]);\n            this._link(ar, bl);\n\n            this._legalize(a);\n            return this._legalize(br);\n        }\n\n        return ar;\n    },\n\n    _link: function (a, b) {\n        this.adjacent[a] = b;\n        if (b !== -1) this.adjacent[b] = a;\n    },\n\n    _addTriangle(i, e) {\n        var t = this.trianglesLen;\n        this.triangles[t] = e.i;\n        this.triangles[t + 1] = i;\n        this.triangles[t + 2] = e.next.i;\n        this.trianglesLen += 3;\n        return t;\n    }\n};\n\nfunction dist(ax, ay, bx, by) {\n    var dx = ax - bx;\n    var dy = ay - by;\n    return dx * dx + dy * dy;\n}\n\nfunction area(px, py, qx, qy, rx, ry) {\n    return (qy - py) * (rx - qx) - (qx - px) * (ry - qy);\n}\n\nfunction inCircle(ax, ay, bx, by, cx, cy, px, py) {\n    ax -= px;\n    ay -= py;\n    bx -= px;\n    by -= py;\n    cx -= px;\n    cy -= py;\n\n    var ap = ax * ax + ay * ay;\n    var bp = bx * bx + by * by;\n    var cp = cx * cx + cy * cy;\n\n    var det = ax * (by * cp - bp * cy) -\n              ay * (bx * cp - bp * cx) +\n              ap * (bx * cy - by * cx);\n\n    return det < 0;\n}\n\nfunction circumradius(ax, ay, bx, by, cx, cy) {\n    bx -= ax;\n    by -= ay;\n    cx -= ax;\n    cy -= ay;\n\n    var bl = bx * bx + by * by;\n    var cl = cx * cx + cy * cy;\n\n    if (bl === 0 || cl === 0) return Infinity;\n\n    var d = bx * cy - by * cx;\n    if (d === 0) return Infinity;\n\n    var x = (cy * bl - by * cl) * 0.5 / d;\n    var y = (bx * cl - cx * bl) * 0.5 / d;\n\n    return x * x + y * y;\n}\n\nfunction circumcenter(ax, ay, bx, by, cx, cy) {\n    bx -= ax;\n    by -= ay;\n    cx -= ax;\n    cy -= ay;\n\n    var bl = bx * bx + by * by;\n    var cl = cx * cx + cy * cy;\n\n    var d = bx * cy - by * cx;\n\n    var x = (cy * bl - by * cl) * 0.5 / d;\n    var y = (bx * cl - cx * bl) * 0.5 / d;\n\n    return {\n        x: ax + x,\n        y: ay + y\n    };\n}\n\n// create a new node in a doubly linked list\nfunction insertNode(coords, i, prev) {\n    var node = {\n        i: i,\n        x: coords[2 * i],\n        y: coords[2 * i + 1],\n        t: 0,\n        prev: null,\n        next: null,\n        removed: false\n    };\n\n    if (!prev) {\n        node.prev = node;\n        node.next = node;\n\n    } else {\n        node.next = prev.next;\n        node.prev = prev;\n        prev.next.prev = node;\n        prev.next = node;\n    }\n    return node;\n}\n\nfunction removeNode(node) {\n    node.prev.next = node.next;\n    node.next.prev = node.prev;\n    node.removed = true;\n    return node.prev;\n}\n\nfunction quicksort(ids, coords, left, right, cx, cy) {\n    var i, j, temp;\n\n    if (right - left <= 20) {\n        for (i = left + 1; i <= right; i++) {\n            temp = ids[i];\n            j = i - 1;\n            while (j >= left && compare(coords, ids[j], temp, cx, cy) > 0) ids[j + 1] = ids[j--];\n            ids[j + 1] = temp;\n        }\n    } else {\n        var median = (left + right) >> 1;\n        i = left + 1;\n        j = right;\n        swap(ids, median, i);\n        if (compare(coords, ids[left], ids[right], cx, cy) > 0) swap(ids, left, right);\n        if (compare(coords, ids[i], ids[right], cx, cy) > 0) swap(ids, i, right);\n        if (compare(coords, ids[left], ids[i], cx, cy) > 0) swap(ids, left, i);\n\n        temp = ids[i];\n        while (true) {\n            do i++; while (compare(coords, ids[i], temp, cx, cy) < 0);\n            do j--; while (compare(coords, ids[j], temp, cx, cy) > 0);\n            if (j < i) break;\n            swap(ids, i, j);\n        }\n        ids[left + 1] = ids[j];\n        ids[j] = temp;\n\n        if (right - i + 1 >= j - left) {\n            quicksort(ids, coords, i, right, cx, cy);\n            quicksort(ids, coords, left, j - 1, cx, cy);\n        } else {\n            quicksort(ids, coords, left, j - 1, cx, cy);\n            quicksort(ids, coords, i, right, cx, cy);\n        }\n    }\n}\n\nfunction compare(coords, i, j, cx, cy) {\n    var d1 = dist(coords[2 * i], coords[2 * i + 1], cx, cy);\n    var d2 = dist(coords[2 * j], coords[2 * j + 1], cx, cy);\n    return (d1 - d2) || (coords[2 * i] - coords[2 * j]) || (coords[2 * i + 1] - coords[2 * j + 1]);\n}\n\nfunction swap(arr, i, j) {\n    var tmp = arr[i];\n    arr[i] = arr[j];\n    arr[j] = tmp;\n}\n\nfunction defaultGetX(p) {\n    return p[0];\n}\nfunction defaultGetY(p) {\n    return p[1];\n}\n"]}
require=(function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require=="function"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error("Cannot find module '"+o+"'");throw f.code="MODULE_NOT_FOUND",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require=="function"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})({"perlin-simplex":[function(require,module,exports){
// https://gist.github.com/banksean/304522
//
// Ported from Stefan Gustavson's java implementation
// http://staffwww.itn.liu.se/~stegu/simplexnoise/simplexnoise.pdf
// Read Stefan's excellent paper for details on how this code works.
//
// Sean McCullough [email protected]

/**
 * You can pass in a random number generator object if you like.
 * It is assumed to have a random() method.
 */
module.exports = SimplexNoise = function(r) {
  if (r == undefined) r = Math;
  this.grad3 = [[1,1,0],[-1,1,0],[1,-1,0],[-1,-1,0], 
                                 [1,0,1],[-1,0,1],[1,0,-1],[-1,0,-1], 
                                 [0,1,1],[0,-1,1],[0,1,-1],[0,-1,-1]]; 
  this.p = [];
  for (var i=0; i<256; i++) {
    this.p[i] = Math.floor(r.random()*256);
  }
  // To remove the need for index wrapping, double the permutation table length 
  this.perm = []; 
  for(var i=0; i<512; i++) {
    this.perm[i]=this.p[i & 255];
  } 

  // A lookup table to traverse the simplex around a given point in 4D. 
  // Details can be found where this table is used, in the 4D noise method. 
  this.simplex = [ 
    [0,1,2,3],[0,1,3,2],[0,0,0,0],[0,2,3,1],[0,0,0,0],[0,0,0,0],[0,0,0,0],[1,2,3,0], 
    [0,2,1,3],[0,0,0,0],[0,3,1,2],[0,3,2,1],[0,0,0,0],[0,0,0,0],[0,0,0,0],[1,3,2,0], 
    [0,0,0,0],[0,0,0,0],[0,0,0,0],[0,0,0,0],[0,0,0,0],[0,0,0,0],[0,0,0,0],[0,0,0,0], 
    [1,2,0,3],[0,0,0,0],[1,3,0,2],[0,0,0,0],[0,0,0,0],[0,0,0,0],[2,3,0,1],[2,3,1,0], 
    [1,0,2,3],[1,0,3,2],[0,0,0,0],[0,0,0,0],[0,0,0,0],[2,0,3,1],[0,0,0,0],[2,1,3,0], 
    [0,0,0,0],[0,0,0,0],[0,0,0,0],[0,0,0,0],[0,0,0,0],[0,0,0,0],[0,0,0,0],[0,0,0,0], 
    [2,0,1,3],[0,0,0,0],[0,0,0,0],[0,0,0,0],[3,0,1,2],[3,0,2,1],[0,0,0,0],[3,1,2,0], 
    [2,1,0,3],[0,0,0,0],[0,0,0,0],[0,0,0,0],[3,1,0,2],[0,0,0,0],[3,2,0,1],[3,2,1,0]]; 
};

SimplexNoise.prototype.dot = function(g, x, y) { 
  return g[0]*x + g[1]*y;
};

SimplexNoise.prototype.noise = function(xin, yin) { 
  var n0, n1, n2; // Noise contributions from the three corners 
  // Skew the input space to determine which simplex cell we're in 
  var F2 = 0.5*(Math.sqrt(3.0)-1.0); 
  var s = (xin+yin)*F2; // Hairy factor for 2D 
  var i = Math.floor(xin+s); 
  var j = Math.floor(yin+s); 
  var G2 = (3.0-Math.sqrt(3.0))/6.0; 
  var t = (i+j)*G2; 
  var X0 = i-t; // Unskew the cell origin back to (x,y) space 
  var Y0 = j-t; 
  var x0 = xin-X0; // The x,y distances from the cell origin 
  var y0 = yin-Y0; 
  // For the 2D case, the simplex shape is an equilateral triangle. 
  // Determine which simplex we are in. 
  var i1, j1; // Offsets for second (middle) corner of simplex in (i,j) coords 
  if(x0>y0) {i1=1; j1=0;} // lower triangle, XY order: (0,0)->(1,0)->(1,1) 
  else {i1=0; j1=1;}      // upper triangle, YX order: (0,0)->(0,1)->(1,1) 
  // A step of (1,0) in (i,j) means a step of (1-c,-c) in (x,y), and 
  // a step of (0,1) in (i,j) means a step of (-c,1-c) in (x,y), where 
  // c = (3-sqrt(3))/6 
  var x1 = x0 - i1 + G2; // Offsets for middle corner in (x,y) unskewed coords 
  var y1 = y0 - j1 + G2; 
  var x2 = x0 - 1.0 + 2.0 * G2; // Offsets for last corner in (x,y) unskewed coords 
  var y2 = y0 - 1.0 + 2.0 * G2; 
  // Work out the hashed gradient indices of the three simplex corners 
  var ii = i & 255; 
  var jj = j & 255; 
  var gi0 = this.perm[ii+this.perm[jj]] % 12; 
  var gi1 = this.perm[ii+i1+this.perm[jj+j1]] % 12; 
  var gi2 = this.perm[ii+1+this.perm[jj+1]] % 12; 
  // Calculate the contribution from the three corners 
  var t0 = 0.5 - x0*x0-y0*y0; 
  if(t0<0) n0 = 0.0; 
  else { 
    t0 *= t0; 
    n0 = t0 * t0 * this.dot(this.grad3[gi0], x0, y0);  // (x,y) of grad3 used for 2D gradient 
  } 
  var t1 = 0.5 - x1*x1-y1*y1; 
  if(t1<0) n1 = 0.0; 
  else { 
    t1 *= t1; 
    n1 = t1 * t1 * this.dot(this.grad3[gi1], x1, y1); 
  }
  var t2 = 0.5 - x2*x2-y2*y2; 
  if(t2<0) n2 = 0.0; 
  else { 
    t2 *= t2; 
    n2 = t2 * t2 * this.dot(this.grad3[gi2], x2, y2); 
  } 
  // Add contributions from each corner to get the final noise value. 
  // The result is scaled to return values in the interval [-1,1]. 
  return 70.0 * (n0 + n1 + n2); 
};

// 3D simplex noise 
SimplexNoise.prototype.noise3d = function(xin, yin, zin) { 
  var n0, n1, n2, n3; // Noise contributions from the four corners 
  // Skew the input space to determine which simplex cell we're in 
  var F3 = 1.0/3.0; 
  var s = (xin+yin+zin)*F3; // Very nice and simple skew factor for 3D 
  var i = Math.floor(xin+s); 
  var j = Math.floor(yin+s); 
  var k = Math.floor(zin+s); 
  var G3 = 1.0/6.0; // Very nice and simple unskew factor, too 
  var t = (i+j+k)*G3; 
  var X0 = i-t; // Unskew the cell origin back to (x,y,z) space 
  var Y0 = j-t; 
  var Z0 = k-t; 
  var x0 = xin-X0; // The x,y,z distances from the cell origin 
  var y0 = yin-Y0; 
  var z0 = zin-Z0; 
  // For the 3D case, the simplex shape is a slightly irregular tetrahedron. 
  // Determine which simplex we are in. 
  var i1, j1, k1; // Offsets for second corner of simplex in (i,j,k) coords 
  var i2, j2, k2; // Offsets for third corner of simplex in (i,j,k) coords 
  if(x0>=y0) { 
    if(y0>=z0) 
      { i1=1; j1=0; k1=0; i2=1; j2=1; k2=0; } // X Y Z order 
      else if(x0>=z0) { i1=1; j1=0; k1=0; i2=1; j2=0; k2=1; } // X Z Y order 
      else { i1=0; j1=0; k1=1; i2=1; j2=0; k2=1; } // Z X Y order 
    } 
  else { // x0<y0 
    if(y0<z0) { i1=0; j1=0; k1=1; i2=0; j2=1; k2=1; } // Z Y X order 
    else if(x0<z0) { i1=0; j1=1; k1=0; i2=0; j2=1; k2=1; } // Y Z X order 
    else { i1=0; j1=1; k1=0; i2=1; j2=1; k2=0; } // Y X Z order 
  } 
  // A step of (1,0,0) in (i,j,k) means a step of (1-c,-c,-c) in (x,y,z), 
  // a step of (0,1,0) in (i,j,k) means a step of (-c,1-c,-c) in (x,y,z), and 
  // a step of (0,0,1) in (i,j,k) means a step of (-c,-c,1-c) in (x,y,z), where 
  // c = 1/6.
  var x1 = x0 - i1 + G3; // Offsets for second corner in (x,y,z) coords 
  var y1 = y0 - j1 + G3; 
  var z1 = z0 - k1 + G3; 
  var x2 = x0 - i2 + 2.0*G3; // Offsets for third corner in (x,y,z) coords 
  var y2 = y0 - j2 + 2.0*G3; 
  var z2 = z0 - k2 + 2.0*G3; 
  var x3 = x0 - 1.0 + 3.0*G3; // Offsets for last corner in (x,y,z) coords 
  var y3 = y0 - 1.0 + 3.0*G3; 
  var z3 = z0 - 1.0 + 3.0*G3; 
  // Work out the hashed gradient indices of the four simplex corners 
  var ii = i & 255; 
  var jj = j & 255; 
  var kk = k & 255; 
  var gi0 = this.perm[ii+this.perm[jj+this.perm[kk]]] % 12; 
  var gi1 = this.perm[ii+i1+this.perm[jj+j1+this.perm[kk+k1]]] % 12; 
  var gi2 = this.perm[ii+i2+this.perm[jj+j2+this.perm[kk+k2]]] % 12; 
  var gi3 = this.perm[ii+1+this.perm[jj+1+this.perm[kk+1]]] % 12; 
  // Calculate the contribution from the four corners 
  var t0 = 0.6 - x0*x0 - y0*y0 - z0*z0; 
  if(t0<0) n0 = 0.0; 
  else { 
    t0 *= t0; 
    n0 = t0 * t0 * this.dot(this.grad3[gi0], x0, y0, z0); 
  }
  var t1 = 0.6 - x1*x1 - y1*y1 - z1*z1; 
  if(t1<0) n1 = 0.0; 
  else { 
    t1 *= t1; 
    n1 = t1 * t1 * this.dot(this.grad3[gi1], x1, y1, z1); 
  } 
  var t2 = 0.6 - x2*x2 - y2*y2 - z2*z2; 
  if(t2<0) n2 = 0.0; 
  else { 
    t2 *= t2; 
    n2 = t2 * t2 * this.dot(this.grad3[gi2], x2, y2, z2); 
  } 
  var t3 = 0.6 - x3*x3 - y3*y3 - z3*z3; 
  if(t3<0) n3 = 0.0; 
  else { 
    t3 *= t3; 
    n3 = t3 * t3 * this.dot(this.grad3[gi3], x3, y3, z3); 
  } 
  // Add contributions from each corner to get the final noise value. 
  // The result is scaled to stay just inside [-1,1] 
  return 32.0*(n0 + n1 + n2 + n3); 
};
},{}]},{},[])
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\n  this.p = [];\n  for (var i=0; i<256; i++) {\n    this.p[i] = Math.floor(r.random()*256);\n  }\n  // To remove the need for index wrapping, double the permutation table length \n  this.perm = []; \n  for(var i=0; i<512; i++) {\n    this.perm[i]=this.p[i & 255];\n  } \n\n  // A lookup table to traverse the simplex around a given point in 4D. \n  // Details can be found where this table is used, in the 4D noise method. \n  this.simplex = [ \n    [0,1,2,3],[0,1,3,2],[0,0,0,0],[0,2,3,1],[0,0,0,0],[0,0,0,0],[0,0,0,0],[1,2,3,0], \n    [0,2,1,3],[0,0,0,0],[0,3,1,2],[0,3,2,1],[0,0,0,0],[0,0,0,0],[0,0,0,0],[1,3,2,0], \n    [0,0,0,0],[0,0,0,0],[0,0,0,0],[0,0,0,0],[0,0,0,0],[0,0,0,0],[0,0,0,0],[0,0,0,0], \n    [1,2,0,3],[0,0,0,0],[1,3,0,2],[0,0,0,0],[0,0,0,0],[0,0,0,0],[2,3,0,1],[2,3,1,0], \n    [1,0,2,3],[1,0,3,2],[0,0,0,0],[0,0,0,0],[0,0,0,0],[2,0,3,1],[0,0,0,0],[2,1,3,0], \n    [0,0,0,0],[0,0,0,0],[0,0,0,0],[0,0,0,0],[0,0,0,0],[0,0,0,0],[0,0,0,0],[0,0,0,0], \n    [2,0,1,3],[0,0,0,0],[0,0,0,0],[0,0,0,0],[3,0,1,2],[3,0,2,1],[0,0,0,0],[3,1,2,0], \n    [2,1,0,3],[0,0,0,0],[0,0,0,0],[0,0,0,0],[3,1,0,2],[0,0,0,0],[3,2,0,1],[3,2,1,0]]; \n};\n\nSimplexNoise.prototype.dot = function(g, x, y) { \n  return g[0]*x + g[1]*y;\n};\n\nSimplexNoise.prototype.noise = function(xin, yin) { \n  var n0, n1, n2; // Noise contributions from the three corners \n  // Skew the input space to determine which simplex cell we're in \n  var F2 = 0.5*(Math.sqrt(3.0)-1.0); \n  var s = (xin+yin)*F2; // Hairy factor for 2D \n  var i = Math.floor(xin+s); \n  var j = Math.floor(yin+s); \n  var G2 = (3.0-Math.sqrt(3.0))/6.0; \n  var t = (i+j)*G2; \n  var X0 = i-t; // Unskew the cell origin back to (x,y) space \n  var Y0 = j-t; \n  var x0 = xin-X0; // The x,y distances from the cell origin \n  var y0 = yin-Y0; \n  // For the 2D case, the simplex shape is an equilateral triangle. \n  // Determine which simplex we are in. \n  var i1, j1; // Offsets for second (middle) corner of simplex in (i,j) coords \n  if(x0>y0) {i1=1; j1=0;} // lower triangle, XY order: (0,0)->(1,0)->(1,1) \n  else {i1=0; j1=1;}      // upper triangle, YX order: (0,0)->(0,1)->(1,1) \n  // A step of (1,0) in (i,j) means a step of (1-c,-c) in (x,y), and \n  // a step of (0,1) in (i,j) means a step of (-c,1-c) in (x,y), where \n  // c = (3-sqrt(3))/6 \n  var x1 = x0 - i1 + G2; // Offsets for middle corner in (x,y) unskewed coords \n  var y1 = y0 - j1 + G2; \n  var x2 = x0 - 1.0 + 2.0 * G2; // Offsets for last corner in (x,y) unskewed coords \n  var y2 = y0 - 1.0 + 2.0 * G2; \n  // Work out the hashed gradient indices of the three simplex corners \n  var ii = i & 255; \n  var jj = j & 255; \n  var gi0 = this.perm[ii+this.perm[jj]] % 12; \n  var gi1 = this.perm[ii+i1+this.perm[jj+j1]] % 12; \n  var gi2 = this.perm[ii+1+this.perm[jj+1]] % 12; \n  // Calculate the contribution from the three corners \n  var t0 = 0.5 - x0*x0-y0*y0; \n  if(t0<0) n0 = 0.0; \n  else { \n    t0 *= t0; \n    n0 = t0 * t0 * this.dot(this.grad3[gi0], x0, y0);  // (x,y) of grad3 used for 2D gradient \n  } \n  var t1 = 0.5 - x1*x1-y1*y1; \n  if(t1<0) n1 = 0.0; \n  else { \n    t1 *= t1; \n    n1 = t1 * t1 * this.dot(this.grad3[gi1], x1, y1); \n  }\n  var t2 = 0.5 - x2*x2-y2*y2; \n  if(t2<0) n2 = 0.0; \n  else { \n    t2 *= t2; \n    n2 = t2 * t2 * this.dot(this.grad3[gi2], x2, y2); \n  } \n  // Add contributions from each corner to get the final noise value. \n  // The result is scaled to return values in the interval [-1,1]. \n  return 70.0 * (n0 + n1 + n2); \n};\n\n// 3D simplex noise \nSimplexNoise.prototype.noise3d = function(xin, yin, zin) { \n  var n0, n1, n2, n3; // Noise contributions from the four corners \n  // Skew the input space to determine which simplex cell we're in \n  var F3 = 1.0/3.0; \n  var s = (xin+yin+zin)*F3; // Very nice and simple skew factor for 3D \n  var i = Math.floor(xin+s); \n  var j = Math.floor(yin+s); \n  var k = Math.floor(zin+s); \n  var G3 = 1.0/6.0; // Very nice and simple unskew factor, too \n  var t = (i+j+k)*G3; \n  var X0 = i-t; // Unskew the cell origin back to (x,y,z) space \n  var Y0 = j-t; \n  var Z0 = k-t; \n  var x0 = xin-X0; // The x,y,z distances from the cell origin \n  var y0 = yin-Y0; \n  var z0 = zin-Z0; \n  // For the 3D case, the simplex shape is a slightly irregular tetrahedron. \n  // Determine which simplex we are in. \n  var i1, j1, k1; // Offsets for second corner of simplex in (i,j,k) coords \n  var i2, j2, k2; // Offsets for third corner of simplex in (i,j,k) coords \n  if(x0>=y0) { \n    if(y0>=z0) \n      { i1=1; j1=0; k1=0; i2=1; j2=1; k2=0; } // X Y Z order \n      else if(x0>=z0) { i1=1; j1=0; k1=0; i2=1; j2=0; k2=1; } // X Z Y order \n      else { i1=0; j1=0; k1=1; i2=1; j2=0; k2=1; } // Z X Y order \n    } \n  else { // x0<y0 \n    if(y0<z0) { i1=0; j1=0; k1=1; i2=0; j2=1; k2=1; } // Z Y X order \n    else if(x0<z0) { i1=0; j1=1; k1=0; i2=0; j2=1; k2=1; } // Y Z X order \n    else { i1=0; j1=1; k1=0; i2=1; j2=1; k2=0; } // Y X Z order \n  } \n  // A step of (1,0,0) in (i,j,k) means a step of (1-c,-c,-c) in (x,y,z), \n  // a step of (0,1,0) in (i,j,k) means a step of (-c,1-c,-c) in (x,y,z), and \n  // a step of (0,0,1) in (i,j,k) means a step of (-c,-c,1-c) in (x,y,z), where \n  // c = 1/6.\n  var x1 = x0 - i1 + G3; // Offsets for second corner in (x,y,z) coords \n  var y1 = y0 - j1 + G3; \n  var z1 = z0 - k1 + G3; \n  var x2 = x0 - i2 + 2.0*G3; // Offsets for third corner in (x,y,z) coords \n  var y2 = y0 - j2 + 2.0*G3; \n  var z2 = z0 - k2 + 2.0*G3; \n  var x3 = x0 - 1.0 + 3.0*G3; // Offsets for last corner in (x,y,z) coords \n  var y3 = y0 - 1.0 + 3.0*G3; \n  var z3 = z0 - 1.0 + 3.0*G3; \n  // Work out the hashed gradient indices of the four simplex corners \n  var ii = i & 255; \n  var jj = j & 255; \n  var kk = k & 255; \n  var gi0 = this.perm[ii+this.perm[jj+this.perm[kk]]] % 12; \n  var gi1 = this.perm[ii+i1+this.perm[jj+j1+this.perm[kk+k1]]] % 12; \n  var gi2 = this.perm[ii+i2+this.perm[jj+j2+this.perm[kk+k2]]] % 12; \n  var gi3 = this.perm[ii+1+this.perm[jj+1+this.perm[kk+1]]] % 12; \n  // Calculate the contribution from the four corners \n  var t0 = 0.6 - x0*x0 - y0*y0 - z0*z0; \n  if(t0<0) n0 = 0.0; \n  else { \n    t0 *= t0; \n    n0 = t0 * t0 * this.dot(this.grad3[gi0], x0, y0, z0); \n  }\n  var t1 = 0.6 - x1*x1 - y1*y1 - z1*z1; \n  if(t1<0) n1 = 0.0; \n  else { \n    t1 *= t1; \n    n1 = t1 * t1 * this.dot(this.grad3[gi1], x1, y1, z1); \n  } \n  var t2 = 0.6 - x2*x2 - y2*y2 - z2*z2; \n  if(t2<0) n2 = 0.0; \n  else { \n    t2 *= t2; \n    n2 = t2 * t2 * this.dot(this.grad3[gi2], x2, y2, z2); \n  } \n  var t3 = 0.6 - x3*x3 - y3*y3 - z3*z3; \n  if(t3<0) n3 = 0.0; \n  else { \n    t3 *= t3; \n    n3 = t3 * t3 * this.dot(this.grad3[gi3], x3, y3, z3); \n  } \n  // Add contributions from each corner to get the final noise value. \n  // The result is scaled to stay just inside [-1,1] \n  return 32.0*(n0 + n1 + n2 + n3); \n};"]}
var Delaunator = require('delaunator')
var Simplex = require('perlin-simplex')
var simplex = new Simplex()

var SPEED = 0.5
var N_POINTS = 200

var width = 0.75 * window.innerWidth
var height = 0.75 * window.innerHeight

document.body.style.background = 'rgb(20, 20, 20)'

var points = createPoints(N_POINTS, width, height)

points.forEach(function (point) {
  // document.body.appendChild(point.el)
})

var parent = document.createElement('div')
parent.style.position = 'absolute'
parent.style.top = 0.125 * window.innerHeight + 'px'
parent.style.left = 0.125 * window.innerWidth + 'px'
document.body.appendChild(parent)
var triangles = createTrianges(points)
parent.appendChild(triangles.el)

window.requestAnimationFrame(updateLoop)

function updateLoop () {
  window.requestAnimationFrame(updateLoop)
  points.forEach(function (point, i) {
    // var theta = (0.5 - Math.random()) * (Math.PI / 16)
    var x = point.x / 40
    var y = point.y / 40
    var z = Date.now() / 10000
    var s = simplex.noise3d(x, y, z)
    // var s = simplex.noise(x, y)
    var theta1 = s * (2 * Math.PI)
    var theta = (0.01 * theta1) + (0.99 * point.theta)
    // if (i === 0) console.log(s, theta)
    point.move(theta, SPEED)
  })
  triangles.update(points)
}

function createPoints (n, w, h) {
  var points = []

  var x, y
  for (var i = 0; i < n; i++) {
    x = Math.floor(Math.random() * w)
    y = Math.floor(Math.random() * h)
    points.push(createPoint([x, y]))
  }

  return points
}

function createPoint (coords) {
  var w = 20
  var h = w

  var el = document.createElement('div')
  el.style.position = 'absolute'
  el.style.left = coords[0] + 'px'
  el.style.top = coords[1] + 'px'
  el.style.width = w + 'px'
  el.style.height = h + 'px'
  el.style.borderRadius = w / 2 + 'px'
  el.style.background = '#aaa'

  var point = {
    el: el,
    x: coords[0],
    y: coords[1],
    theta: Math.random() * 2 * Math.PI,
    move: move
  }

  return point
}

function mod (a, n) {
  return ((a % n) + n) % n
}

function move (theta, r) {
  this.theta = theta
  this.x += r * Math.cos(this.theta)
  this.y += r * Math.sin(this.theta)

  this.x = mod(this.x, width)
  this.y = mod(this.y, height)

  this.el.style.left = this.x + 'px'
  this.el.style.top = this.y + 'px'
}

function createTrianges (points) {
  var stroke = '#ccc'
  var fill = 'rgba(0,0,0,0)'
  var viewBox = [0, 0, width, height].join(' ')

  var pathData = createPathData(points)

  var parent = document.createElement('div')
  parent.innerHTML = `
    <svg xmlns='http://www.w3.org/svg/2000'
      viewBox='${viewBox}'
      width=${width}
      height=${height}
      stroke='${stroke}'
      fill='${fill}'>
      <path d='${pathData}' />
    </svg>
  `
  return {
    el: parent,
    path: parent.querySelector('path'),
    update: update
  }
}

function createPathData (points) {
  var coords = points.map(function (point) {
    return [point.x, point.y]
  })

  var triangles = new Delaunator(coords).triangles

  var pathData = []

  var x0, y0, x1, y1, x2, y2
  for (var i = 0; i < triangles.length; i += 3) {
    x0 = coords[triangles[i]][0]
    y0 = coords[triangles[i]][1]
    x1 = coords[triangles[i + 1]][0]
    y1 = coords[triangles[i + 1]][1]
    x2 = coords[triangles[i + 2]][0]
    y2 = coords[triangles[i + 2]][1]
    pathData.push(['M', x0, y0].join(' '))
    pathData.push(['L', x1, y1].join(' '))
    pathData.push(['L', x2, y2].join(' '))
    pathData.push(['L', x0, y0].join(' '))
  }

  return pathData.join(' ')
}

function update (points) {
  this.path.setAttribute('d', createPathData(points))
}

;}, 0)

package.json

{
  "name": "requirebin-sketch",
  "version": "1.0.0",
  "dependencies": {
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    "perlin-simplex": "0.0.2"
  }
}

page-body.html

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page-head.html

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requirebin.md

made with requirebin