Bar graph added.

node_modules/d3-shape/LICENSE

@@ -0,0 +1,27 @@
+Copyright 2010-2015 Mike Bostock
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without modification,
+are permitted provided that the following conditions are met:
+
+* Redistributions of source code must retain the above copyright notice, this
+  list of conditions and the following disclaimer.
+
+* Redistributions in binary form must reproduce the above copyright notice,
+  this list of conditions and the following disclaimer in the documentation
+  and/or other materials provided with the distribution.
+
+* Neither the name of the author nor the names of contributors may be used to
+  endorse or promote products derived from this software without specific prior
+  written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
+ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

node_modules/d3-shape/package.json

@@ -0,0 +1,76 @@
+{
+  "_from": "d3-shape@^1.3.7",
+  "_id": "d3-shape@1.3.7",
+  "_inBundle": false,
+  "_integrity": "sha512-EUkvKjqPFUAZyOlhY5gzCxCeI0Aep04LwIRpsZ/mLFelJiUfnK56jo5JMDSE7yyP2kLSb6LtF+S5chMk7uqPqw==",
+  "_location": "/d3-shape",
+  "_phantomChildren": {},
+  "_requested": {
+    "type": "range",
+    "registry": true,
+    "raw": "d3-shape@^1.3.7",
+    "name": "d3-shape",
+    "escapedName": "d3-shape",
+    "rawSpec": "^1.3.7",
+    "saveSpec": null,
+    "fetchSpec": "^1.3.7"
+  },
+  "_requiredBy": [
+    "/vega-scenegraph"
+  ],
+  "_resolved": "https://registry.npmjs.org/d3-shape/-/d3-shape-1.3.7.tgz",
+  "_shasum": "df63801be07bc986bc54f63789b4fe502992b5d7",
+  "_spec": "d3-shape@^1.3.7",
+  "_where": "/home/prabhatdev/Documents/opensource/gitHubStats/waka-readme-stats/node_modules/vega-scenegraph",
+  "author": {
+    "name": "Mike Bostock",
+    "url": "http://bost.ocks.org/mike"
+  },
+  "bugs": {
+    "url": "https://github.com/d3/d3-shape/issues"
+  },
+  "bundleDependencies": false,
+  "dependencies": {
+    "d3-path": "1"
+  },
+  "deprecated": false,
+  "description": "Graphical primitives for visualization, such as lines and areas.",
+  "devDependencies": {
+    "d3-polygon": "1",
+    "eslint": "6",
+    "rollup": "1",
+    "rollup-plugin-terser": "5",
+    "tape": "4"
+  },
+  "files": [
+    "dist/**/*.js",
+    "src/**/*.js"
+  ],
+  "homepage": "https://d3js.org/d3-shape/",
+  "jsdelivr": "dist/d3-shape.min.js",
+  "keywords": [
+    "d3",
+    "d3-module",
+    "graphics",
+    "visualization",
+    "canvas",
+    "svg"
+  ],
+  "license": "BSD-3-Clause",
+  "main": "dist/d3-shape.js",
+  "module": "src/index.js",
+  "name": "d3-shape",
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/d3/d3-shape.git"
+  },
+  "scripts": {
+    "postpublish": "git push && git push --tags && cd ../d3.github.com && git pull && cp ../${npm_package_name}/dist/${npm_package_name}.js ${npm_package_name}.v${npm_package_version%%.*}.js && cp ../${npm_package_name}/dist/${npm_package_name}.min.js ${npm_package_name}.v${npm_package_version%%.*}.min.js && git add ${npm_package_name}.v${npm_package_version%%.*}.js ${npm_package_name}.v${npm_package_version%%.*}.min.js && git commit -m \"${npm_package_name} ${npm_package_version}\" && git push && cd - && zip -j dist/${npm_package_name}.zip -- LICENSE README.md dist/${npm_package_name}.js dist/${npm_package_name}.min.js",
+    "prepublishOnly": "rm -rf dist && yarn test",
+    "pretest": "rollup -c",
+    "test": "tape 'test/**/*-test.js' && eslint src"
+  },
+  "sideEffects": false,
+  "unpkg": "dist/d3-shape.min.js",
+  "version": "1.3.7"
+}

node_modules/d3-shape/src/arc.js

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+import {path} from "d3-path";
+import constant from "./constant.js";
+import {abs, acos, asin, atan2, cos, epsilon, halfPi, max, min, pi, sin, sqrt, tau} from "./math.js";
+
+function arcInnerRadius(d) {
+  return d.innerRadius;
+}
+
+function arcOuterRadius(d) {
+  return d.outerRadius;
+}
+
+function arcStartAngle(d) {
+  return d.startAngle;
+}
+
+function arcEndAngle(d) {
+  return d.endAngle;
+}
+
+function arcPadAngle(d) {
+  return d && d.padAngle; // Note: optional!
+}
+
+function intersect(x0, y0, x1, y1, x2, y2, x3, y3) {
+  var x10 = x1 - x0, y10 = y1 - y0,
+      x32 = x3 - x2, y32 = y3 - y2,
+      t = y32 * x10 - x32 * y10;
+  if (t * t < epsilon) return;
+  t = (x32 * (y0 - y2) - y32 * (x0 - x2)) / t;
+  return [x0 + t * x10, y0 + t * y10];
+}
+
+// Compute perpendicular offset line of length rc.
+// http://mathworld.wolfram.com/Circle-LineIntersection.html
+function cornerTangents(x0, y0, x1, y1, r1, rc, cw) {
+  var x01 = x0 - x1,
+      y01 = y0 - y1,
+      lo = (cw ? rc : -rc) / sqrt(x01 * x01 + y01 * y01),
+      ox = lo * y01,
+      oy = -lo * x01,
+      x11 = x0 + ox,
+      y11 = y0 + oy,
+      x10 = x1 + ox,
+      y10 = y1 + oy,
+      x00 = (x11 + x10) / 2,
+      y00 = (y11 + y10) / 2,
+      dx = x10 - x11,
+      dy = y10 - y11,
+      d2 = dx * dx + dy * dy,
+      r = r1 - rc,
+      D = x11 * y10 - x10 * y11,
+      d = (dy < 0 ? -1 : 1) * sqrt(max(0, r * r * d2 - D * D)),
+      cx0 = (D * dy - dx * d) / d2,
+      cy0 = (-D * dx - dy * d) / d2,
+      cx1 = (D * dy + dx * d) / d2,
+      cy1 = (-D * dx + dy * d) / d2,
+      dx0 = cx0 - x00,
+      dy0 = cy0 - y00,
+      dx1 = cx1 - x00,
+      dy1 = cy1 - y00;
+
+  // Pick the closer of the two intersection points.
+  // TODO Is there a faster way to determine which intersection to use?
+  if (dx0 * dx0 + dy0 * dy0 > dx1 * dx1 + dy1 * dy1) cx0 = cx1, cy0 = cy1;
+
+  return {
+    cx: cx0,
+    cy: cy0,
+    x01: -ox,
+    y01: -oy,
+    x11: cx0 * (r1 / r - 1),
+    y11: cy0 * (r1 / r - 1)
+  };
+}
+
+export default function() {
+  var innerRadius = arcInnerRadius,
+      outerRadius = arcOuterRadius,
+      cornerRadius = constant(0),
+      padRadius = null,
+      startAngle = arcStartAngle,
+      endAngle = arcEndAngle,
+      padAngle = arcPadAngle,
+      context = null;
+
+  function arc() {
+    var buffer,
+        r,
+        r0 = +innerRadius.apply(this, arguments),
+        r1 = +outerRadius.apply(this, arguments),
+        a0 = startAngle.apply(this, arguments) - halfPi,
+        a1 = endAngle.apply(this, arguments) - halfPi,
+        da = abs(a1 - a0),
+        cw = a1 > a0;
+
+    if (!context) context = buffer = path();
+
+    // Ensure that the outer radius is always larger than the inner radius.
+    if (r1 < r0) r = r1, r1 = r0, r0 = r;
+
+    // Is it a point?
+    if (!(r1 > epsilon)) context.moveTo(0, 0);
+
+    // Or is it a circle or annulus?
+    else if (da > tau - epsilon) {
+      context.moveTo(r1 * cos(a0), r1 * sin(a0));
+      context.arc(0, 0, r1, a0, a1, !cw);
+      if (r0 > epsilon) {
+        context.moveTo(r0 * cos(a1), r0 * sin(a1));
+        context.arc(0, 0, r0, a1, a0, cw);
+      }
+    }
+
+    // Or is it a circular or annular sector?
+    else {
+      var a01 = a0,
+          a11 = a1,
+          a00 = a0,
+          a10 = a1,
+          da0 = da,
+          da1 = da,
+          ap = padAngle.apply(this, arguments) / 2,
+          rp = (ap > epsilon) && (padRadius ? +padRadius.apply(this, arguments) : sqrt(r0 * r0 + r1 * r1)),
+          rc = min(abs(r1 - r0) / 2, +cornerRadius.apply(this, arguments)),
+          rc0 = rc,
+          rc1 = rc,
+          t0,
+          t1;
+
+      // Apply padding? Note that since r1 ≥ r0, da1 ≥ da0.
+      if (rp > epsilon) {
+        var p0 = asin(rp / r0 * sin(ap)),
+            p1 = asin(rp / r1 * sin(ap));
+        if ((da0 -= p0 * 2) > epsilon) p0 *= (cw ? 1 : -1), a00 += p0, a10 -= p0;
+        else da0 = 0, a00 = a10 = (a0 + a1) / 2;
+        if ((da1 -= p1 * 2) > epsilon) p1 *= (cw ? 1 : -1), a01 += p1, a11 -= p1;
+        else da1 = 0, a01 = a11 = (a0 + a1) / 2;
+      }
+
+      var x01 = r1 * cos(a01),
+          y01 = r1 * sin(a01),
+          x10 = r0 * cos(a10),
+          y10 = r0 * sin(a10);
+
+      // Apply rounded corners?
+      if (rc > epsilon) {
+        var x11 = r1 * cos(a11),
+            y11 = r1 * sin(a11),
+            x00 = r0 * cos(a00),
+            y00 = r0 * sin(a00),
+            oc;
+
+        // Restrict the corner radius according to the sector angle.
+        if (da < pi && (oc = intersect(x01, y01, x00, y00, x11, y11, x10, y10))) {
+          var ax = x01 - oc[0],
+              ay = y01 - oc[1],
+              bx = x11 - oc[0],
+              by = y11 - oc[1],
+              kc = 1 / sin(acos((ax * bx + ay * by) / (sqrt(ax * ax + ay * ay) * sqrt(bx * bx + by * by))) / 2),
+              lc = sqrt(oc[0] * oc[0] + oc[1] * oc[1]);
+          rc0 = min(rc, (r0 - lc) / (kc - 1));
+          rc1 = min(rc, (r1 - lc) / (kc + 1));
+        }
+      }
+
+      // Is the sector collapsed to a line?
+      if (!(da1 > epsilon)) context.moveTo(x01, y01);
+
+      // Does the sector’s outer ring have rounded corners?
+      else if (rc1 > epsilon) {
+        t0 = cornerTangents(x00, y00, x01, y01, r1, rc1, cw);
+        t1 = cornerTangents(x11, y11, x10, y10, r1, rc1, cw);
+
+        context.moveTo(t0.cx + t0.x01, t0.cy + t0.y01);
+
+        // Have the corners merged?
+        if (rc1 < rc) context.arc(t0.cx, t0.cy, rc1, atan2(t0.y01, t0.x01), atan2(t1.y01, t1.x01), !cw);
+
+        // Otherwise, draw the two corners and the ring.
+        else {
+          context.arc(t0.cx, t0.cy, rc1, atan2(t0.y01, t0.x01), atan2(t0.y11, t0.x11), !cw);
+          context.arc(0, 0, r1, atan2(t0.cy + t0.y11, t0.cx + t0.x11), atan2(t1.cy + t1.y11, t1.cx + t1.x11), !cw);
+          context.arc(t1.cx, t1.cy, rc1, atan2(t1.y11, t1.x11), atan2(t1.y01, t1.x01), !cw);
+        }
+      }
+
+      // Or is the outer ring just a circular arc?
+      else context.moveTo(x01, y01), context.arc(0, 0, r1, a01, a11, !cw);
+
+      // Is there no inner ring, and it’s a circular sector?
+      // Or perhaps it’s an annular sector collapsed due to padding?
+      if (!(r0 > epsilon) || !(da0 > epsilon)) context.lineTo(x10, y10);
+
+      // Does the sector’s inner ring (or point) have rounded corners?
+      else if (rc0 > epsilon) {
+        t0 = cornerTangents(x10, y10, x11, y11, r0, -rc0, cw);
+        t1 = cornerTangents(x01, y01, x00, y00, r0, -rc0, cw);
+
+        context.lineTo(t0.cx + t0.x01, t0.cy + t0.y01);
+
+        // Have the corners merged?
+        if (rc0 < rc) context.arc(t0.cx, t0.cy, rc0, atan2(t0.y01, t0.x01), atan2(t1.y01, t1.x01), !cw);
+
+        // Otherwise, draw the two corners and the ring.
+        else {
+          context.arc(t0.cx, t0.cy, rc0, atan2(t0.y01, t0.x01), atan2(t0.y11, t0.x11), !cw);
+          context.arc(0, 0, r0, atan2(t0.cy + t0.y11, t0.cx + t0.x11), atan2(t1.cy + t1.y11, t1.cx + t1.x11), cw);
+          context.arc(t1.cx, t1.cy, rc0, atan2(t1.y11, t1.x11), atan2(t1.y01, t1.x01), !cw);
+        }
+      }
+
+      // Or is the inner ring just a circular arc?
+      else context.arc(0, 0, r0, a10, a00, cw);
+    }
+
+    context.closePath();
+
+    if (buffer) return context = null, buffer + "" || null;
+  }
+
+  arc.centroid = function() {
+    var r = (+innerRadius.apply(this, arguments) + +outerRadius.apply(this, arguments)) / 2,
+        a = (+startAngle.apply(this, arguments) + +endAngle.apply(this, arguments)) / 2 - pi / 2;
+    return [cos(a) * r, sin(a) * r];
+  };
+
+  arc.innerRadius = function(_) {
+    return arguments.length ? (innerRadius = typeof _ === "function" ? _ : constant(+_), arc) : innerRadius;
+  };
+
+  arc.outerRadius = function(_) {
+    return arguments.length ? (outerRadius = typeof _ === "function" ? _ : constant(+_), arc) : outerRadius;
+  };
+
+  arc.cornerRadius = function(_) {
+    return arguments.length ? (cornerRadius = typeof _ === "function" ? _ : constant(+_), arc) : cornerRadius;
+  };
+
+  arc.padRadius = function(_) {
+    return arguments.length ? (padRadius = _ == null ? null : typeof _ === "function" ? _ : constant(+_), arc) : padRadius;
+  };
+
+  arc.startAngle = function(_) {
+    return arguments.length ? (startAngle = typeof _ === "function" ? _ : constant(+_), arc) : startAngle;
+  };
+
+  arc.endAngle = function(_) {
+    return arguments.length ? (endAngle = typeof _ === "function" ? _ : constant(+_), arc) : endAngle;
+  };
+
+  arc.padAngle = function(_) {
+    return arguments.length ? (padAngle = typeof _ === "function" ? _ : constant(+_), arc) : padAngle;
+  };
+
+  arc.context = function(_) {
+    return arguments.length ? ((context = _ == null ? null : _), arc) : context;
+  };
+
+  return arc;
+}

node_modules/d3-shape/src/area.js

@@ -0,0 +1,109 @@
+import {path} from "d3-path";
+import constant from "./constant.js";
+import curveLinear from "./curve/linear.js";
+import line from "./line.js";
+import {x as pointX, y as pointY} from "./point.js";
+
+export default function() {
+  var x0 = pointX,
+      x1 = null,
+      y0 = constant(0),
+      y1 = pointY,
+      defined = constant(true),
+      context = null,
+      curve = curveLinear,
+      output = null;
+
+  function area(data) {
+    var i,
+        j,
+        k,
+        n = data.length,
+        d,
+        defined0 = false,
+        buffer,
+        x0z = new Array(n),
+        y0z = new Array(n);
+
+    if (context == null) output = curve(buffer = path());
+
+    for (i = 0; i <= n; ++i) {
+      if (!(i < n && defined(d = data[i], i, data)) === defined0) {
+        if (defined0 = !defined0) {
+          j = i;
+          output.areaStart();
+          output.lineStart();
+        } else {
+          output.lineEnd();
+          output.lineStart();
+          for (k = i - 1; k >= j; --k) {
+            output.point(x0z[k], y0z[k]);
+          }
+          output.lineEnd();
+          output.areaEnd();
+        }
+      }
+      if (defined0) {
+        x0z[i] = +x0(d, i, data), y0z[i] = +y0(d, i, data);
+        output.point(x1 ? +x1(d, i, data) : x0z[i], y1 ? +y1(d, i, data) : y0z[i]);
+      }
+    }
+
+    if (buffer) return output = null, buffer + "" || null;
+  }
+
+  function arealine() {
+    return line().defined(defined).curve(curve).context(context);
+  }
+
+  area.x = function(_) {
+    return arguments.length ? (x0 = typeof _ === "function" ? _ : constant(+_), x1 = null, area) : x0;
+  };
+
+  area.x0 = function(_) {
+    return arguments.length ? (x0 = typeof _ === "function" ? _ : constant(+_), area) : x0;
+  };
+
+  area.x1 = function(_) {
+    return arguments.length ? (x1 = _ == null ? null : typeof _ === "function" ? _ : constant(+_), area) : x1;
+  };
+
+  area.y = function(_) {
+    return arguments.length ? (y0 = typeof _ === "function" ? _ : constant(+_), y1 = null, area) : y0;
+  };
+
+  area.y0 = function(_) {
+    return arguments.length ? (y0 = typeof _ === "function" ? _ : constant(+_), area) : y0;
+  };
+
+  area.y1 = function(_) {
+    return arguments.length ? (y1 = _ == null ? null : typeof _ === "function" ? _ : constant(+_), area) : y1;
+  };
+
+  area.lineX0 =
+  area.lineY0 = function() {
+    return arealine().x(x0).y(y0);
+  };
+
+  area.lineY1 = function() {
+    return arealine().x(x0).y(y1);
+  };
+
+  area.lineX1 = function() {
+    return arealine().x(x1).y(y0);
+  };
+
+  area.defined = function(_) {
+    return arguments.length ? (defined = typeof _ === "function" ? _ : constant(!!_), area) : defined;
+  };
+
+  area.curve = function(_) {
+    return arguments.length ? (curve = _, context != null && (output = curve(context)), area) : curve;
+  };
+
+  area.context = function(_) {
+    return arguments.length ? (_ == null ? context = output = null : output = curve(context = _), area) : context;
+  };
+
+  return area;
+}

node_modules/d3-shape/src/areaRadial.js

@@ -0,0 +1,29 @@
+import curveRadial, {curveRadialLinear} from "./curve/radial.js";
+import area from "./area.js";
+import {lineRadial} from "./lineRadial.js";
+
+export default function() {
+  var a = area().curve(curveRadialLinear),
+      c = a.curve,
+      x0 = a.lineX0,
+      x1 = a.lineX1,
+      y0 = a.lineY0,
+      y1 = a.lineY1;
+
+  a.angle = a.x, delete a.x;
+  a.startAngle = a.x0, delete a.x0;
+  a.endAngle = a.x1, delete a.x1;
+  a.radius = a.y, delete a.y;
+  a.innerRadius = a.y0, delete a.y0;
+  a.outerRadius = a.y1, delete a.y1;
+  a.lineStartAngle = function() { return lineRadial(x0()); }, delete a.lineX0;
+  a.lineEndAngle = function() { return lineRadial(x1()); }, delete a.lineX1;
+  a.lineInnerRadius = function() { return lineRadial(y0()); }, delete a.lineY0;
+  a.lineOuterRadius = function() { return lineRadial(y1()); }, delete a.lineY1;
+
+  a.curve = function(_) {
+    return arguments.length ? c(curveRadial(_)) : c()._curve;
+  };
+
+  return a;
+}

node_modules/d3-shape/src/array.js

@@ -0,0 +1 @@
+export var slice = Array.prototype.slice;

node_modules/d3-shape/src/constant.js

@@ -0,0 +1,5 @@
+export default function(x) {
+  return function constant() {
+    return x;
+  };
+}

node_modules/d3-shape/src/curve/basis.js

@@ -0,0 +1,51 @@
+export function point(that, x, y) {
+  that._context.bezierCurveTo(
+    (2 * that._x0 + that._x1) / 3,
+    (2 * that._y0 + that._y1) / 3,
+    (that._x0 + 2 * that._x1) / 3,
+    (that._y0 + 2 * that._y1) / 3,
+    (that._x0 + 4 * that._x1 + x) / 6,
+    (that._y0 + 4 * that._y1 + y) / 6
+  );
+}
+
+export function Basis(context) {
+  this._context = context;
+}
+
+Basis.prototype = {
+  areaStart: function() {
+    this._line = 0;
+  },
+  areaEnd: function() {
+    this._line = NaN;
+  },
+  lineStart: function() {
+    this._x0 = this._x1 =
+    this._y0 = this._y1 = NaN;
+    this._point = 0;
+  },
+  lineEnd: function() {
+    switch (this._point) {
+      case 3: point(this, this._x1, this._y1); // proceed
+      case 2: this._context.lineTo(this._x1, this._y1); break;
+    }
+    if (this._line || (this._line !== 0 && this._point === 1)) this._context.closePath();
+    this._line = 1 - this._line;
+  },
+  point: function(x, y) {
+    x = +x, y = +y;
+    switch (this._point) {
+      case 0: this._point = 1; this._line ? this._context.lineTo(x, y) : this._context.moveTo(x, y); break;
+      case 1: this._point = 2; break;
+      case 2: this._point = 3; this._context.lineTo((5 * this._x0 + this._x1) / 6, (5 * this._y0 + this._y1) / 6); // proceed
+      default: point(this, x, y); break;
+    }
+    this._x0 = this._x1, this._x1 = x;
+    this._y0 = this._y1, this._y1 = y;
+  }
+};
+
+export default function(context) {
+  return new Basis(context);
+}

node_modules/d3-shape/src/curve/basisClosed.js

@@ -0,0 +1,52 @@
+import noop from "../noop.js";
+import {point} from "./basis.js";
+
+function BasisClosed(context) {
+  this._context = context;
+}
+
+BasisClosed.prototype = {
+  areaStart: noop,
+  areaEnd: noop,
+  lineStart: function() {
+    this._x0 = this._x1 = this._x2 = this._x3 = this._x4 =
+    this._y0 = this._y1 = this._y2 = this._y3 = this._y4 = NaN;
+    this._point = 0;
+  },
+  lineEnd: function() {
+    switch (this._point) {
+      case 1: {
+        this._context.moveTo(this._x2, this._y2);
+        this._context.closePath();
+        break;
+      }
+      case 2: {
+        this._context.moveTo((this._x2 + 2 * this._x3) / 3, (this._y2 + 2 * this._y3) / 3);
+        this._context.lineTo((this._x3 + 2 * this._x2) / 3, (this._y3 + 2 * this._y2) / 3);
+        this._context.closePath();
+        break;
+      }
+      case 3: {
+        this.point(this._x2, this._y2);
+        this.point(this._x3, this._y3);
+        this.point(this._x4, this._y4);
+        break;
+      }
+    }
+  },
+  point: function(x, y) {
+    x = +x, y = +y;
+    switch (this._point) {
+      case 0: this._point = 1; this._x2 = x, this._y2 = y; break;
+      case 1: this._point = 2; this._x3 = x, this._y3 = y; break;
+      case 2: this._point = 3; this._x4 = x, this._y4 = y; this._context.moveTo((this._x0 + 4 * this._x1 + x) / 6, (this._y0 + 4 * this._y1 + y) / 6); break;
+      default: point(this, x, y); break;
+    }
+    this._x0 = this._x1, this._x1 = x;
+    this._y0 = this._y1, this._y1 = y;
+  }
+};
+
+export default function(context) {
+  return new BasisClosed(context);
+}

node_modules/d3-shape/src/curve/basisOpen.js

@@ -0,0 +1,39 @@
+import {point} from "./basis.js";
+
+function BasisOpen(context) {
+  this._context = context;
+}
+
+BasisOpen.prototype = {
+  areaStart: function() {
+    this._line = 0;
+  },
+  areaEnd: function() {
+    this._line = NaN;
+  },
+  lineStart: function() {
+    this._x0 = this._x1 =
+    this._y0 = this._y1 = NaN;
+    this._point = 0;
+  },
+  lineEnd: function() {
+    if (this._line || (this._line !== 0 && this._point === 3)) this._context.closePath();
+    this._line = 1 - this._line;
+  },
+  point: function(x, y) {
+    x = +x, y = +y;
+    switch (this._point) {
+      case 0: this._point = 1; break;
+      case 1: this._point = 2; break;
+      case 2: this._point = 3; var x0 = (this._x0 + 4 * this._x1 + x) / 6, y0 = (this._y0 + 4 * this._y1 + y) / 6; this._line ? this._context.lineTo(x0, y0) : this._context.moveTo(x0, y0); break;
+      case 3: this._point = 4; // proceed
+      default: point(this, x, y); break;
+    }
+    this._x0 = this._x1, this._x1 = x;
+    this._y0 = this._y1, this._y1 = y;
+  }
+};
+
+export default function(context) {
+  return new BasisOpen(context);
+}

node_modules/d3-shape/src/curve/bundle.js

@@ -0,0 +1,56 @@
+import {Basis} from "./basis.js";
+
+function Bundle(context, beta) {
+  this._basis = new Basis(context);
+  this._beta = beta;
+}
+
+Bundle.prototype = {
+  lineStart: function() {
+    this._x = [];
+    this._y = [];
+    this._basis.lineStart();
+  },
+  lineEnd: function() {
+    var x = this._x,
+        y = this._y,
+        j = x.length - 1;
+
+    if (j > 0) {
+      var x0 = x[0],
+          y0 = y[0],
+          dx = x[j] - x0,
+          dy = y[j] - y0,
+          i = -1,
+          t;
+
+      while (++i <= j) {
+        t = i / j;
+        this._basis.point(
+          this._beta * x[i] + (1 - this._beta) * (x0 + t * dx),
+          this._beta * y[i] + (1 - this._beta) * (y0 + t * dy)
+        );
+      }
+    }
+
+    this._x = this._y = null;
+    this._basis.lineEnd();
+  },
+  point: function(x, y) {
+    this._x.push(+x);
+    this._y.push(+y);
+  }
+};
+
+export default (function custom(beta) {
+
+  function bundle(context) {
+    return beta === 1 ? new Basis(context) : new Bundle(context, beta);
+  }
+
+  bundle.beta = function(beta) {
+    return custom(+beta);
+  };
+
+  return bundle;
+})(0.85);

node_modules/d3-shape/src/curve/cardinal.js

@@ -0,0 +1,61 @@
+export function point(that, x, y) {
+  that._context.bezierCurveTo(
+    that._x1 + that._k * (that._x2 - that._x0),
+    that._y1 + that._k * (that._y2 - that._y0),
+    that._x2 + that._k * (that._x1 - x),
+    that._y2 + that._k * (that._y1 - y),
+    that._x2,
+    that._y2
+  );
+}
+
+export function Cardinal(context, tension) {
+  this._context = context;
+  this._k = (1 - tension) / 6;
+}
+
+Cardinal.prototype = {
+  areaStart: function() {
+    this._line = 0;
+  },
+  areaEnd: function() {
+    this._line = NaN;
+  },
+  lineStart: function() {
+    this._x0 = this._x1 = this._x2 =
+    this._y0 = this._y1 = this._y2 = NaN;
+    this._point = 0;
+  },
+  lineEnd: function() {
+    switch (this._point) {
+      case 2: this._context.lineTo(this._x2, this._y2); break;
+      case 3: point(this, this._x1, this._y1); break;
+    }
+    if (this._line || (this._line !== 0 && this._point === 1)) this._context.closePath();
+    this._line = 1 - this._line;
+  },
+  point: function(x, y) {
+    x = +x, y = +y;
+    switch (this._point) {
+      case 0: this._point = 1; this._line ? this._context.lineTo(x, y) : this._context.moveTo(x, y); break;
+      case 1: this._point = 2; this._x1 = x, this._y1 = y; break;
+      case 2: this._point = 3; // proceed
+      default: point(this, x, y); break;
+    }
+    this._x0 = this._x1, this._x1 = this._x2, this._x2 = x;
+    this._y0 = this._y1, this._y1 = this._y2, this._y2 = y;
+  }
+};
+
+export default (function custom(tension) {
+
+  function cardinal(context) {
+    return new Cardinal(context, tension);
+  }
+
+  cardinal.tension = function(tension) {
+    return custom(+tension);
+  };
+
+  return cardinal;
+})(0);

node_modules/d3-shape/src/curve/cardinalClosed.js

@@ -0,0 +1,61 @@
+import noop from "../noop.js";
+import {point} from "./cardinal.js";
+
+export function CardinalClosed(context, tension) {
+  this._context = context;
+  this._k = (1 - tension) / 6;
+}
+
+CardinalClosed.prototype = {
+  areaStart: noop,
+  areaEnd: noop,
+  lineStart: function() {
+    this._x0 = this._x1 = this._x2 = this._x3 = this._x4 = this._x5 =
+    this._y0 = this._y1 = this._y2 = this._y3 = this._y4 = this._y5 = NaN;
+    this._point = 0;
+  },
+  lineEnd: function() {
+    switch (this._point) {
+      case 1: {
+        this._context.moveTo(this._x3, this._y3);
+        this._context.closePath();
+        break;
+      }
+      case 2: {
+        this._context.lineTo(this._x3, this._y3);
+        this._context.closePath();
+        break;
+      }
+      case 3: {
+        this.point(this._x3, this._y3);
+        this.point(this._x4, this._y4);
+        this.point(this._x5, this._y5);
+        break;
+      }
+    }
+  },
+  point: function(x, y) {
+    x = +x, y = +y;
+    switch (this._point) {
+      case 0: this._point = 1; this._x3 = x, this._y3 = y; break;
+      case 1: this._point = 2; this._context.moveTo(this._x4 = x, this._y4 = y); break;
+      case 2: this._point = 3; this._x5 = x, this._y5 = y; break;
+      default: point(this, x, y); break;
+    }
+    this._x0 = this._x1, this._x1 = this._x2, this._x2 = x;
+    this._y0 = this._y1, this._y1 = this._y2, this._y2 = y;
+  }
+};
+
+export default (function custom(tension) {
+
+  function cardinal(context) {
+    return new CardinalClosed(context, tension);
+  }
+
+  cardinal.tension = function(tension) {
+    return custom(+tension);
+  };
+
+  return cardinal;
+})(0);

node_modules/d3-shape/src/curve/cardinalOpen.js

@@ -0,0 +1,49 @@
+import {point} from "./cardinal.js";
+
+export function CardinalOpen(context, tension) {
+  this._context = context;
+  this._k = (1 - tension) / 6;
+}
+
+CardinalOpen.prototype = {
+  areaStart: function() {
+    this._line = 0;
+  },
+  areaEnd: function() {
+    this._line = NaN;
+  },
+  lineStart: function() {
+    this._x0 = this._x1 = this._x2 =
+    this._y0 = this._y1 = this._y2 = NaN;
+    this._point = 0;
+  },
+  lineEnd: function() {
+    if (this._line || (this._line !== 0 && this._point === 3)) this._context.closePath();
+    this._line = 1 - this._line;
+  },
+  point: function(x, y) {
+    x = +x, y = +y;
+    switch (this._point) {
+      case 0: this._point = 1; break;
+      case 1: this._point = 2; break;
+      case 2: this._point = 3; this._line ? this._context.lineTo(this._x2, this._y2) : this._context.moveTo(this._x2, this._y2); break;
+      case 3: this._point = 4; // proceed
+      default: point(this, x, y); break;
+    }
+    this._x0 = this._x1, this._x1 = this._x2, this._x2 = x;
+    this._y0 = this._y1, this._y1 = this._y2, this._y2 = y;
+  }
+};
+
+export default (function custom(tension) {
+
+  function cardinal(context) {
+    return new CardinalOpen(context, tension);
+  }
+
+  cardinal.tension = function(tension) {
+    return custom(+tension);
+  };
+
+  return cardinal;
+})(0);

node_modules/d3-shape/src/curve/catmullRom.js

@@ -0,0 +1,88 @@
+import {epsilon} from "../math.js";
+import {Cardinal} from "./cardinal.js";
+
+export function point(that, x, y) {
+  var x1 = that._x1,
+      y1 = that._y1,
+      x2 = that._x2,
+      y2 = that._y2;
+
+  if (that._l01_a > epsilon) {
+    var a = 2 * that._l01_2a + 3 * that._l01_a * that._l12_a + that._l12_2a,
+        n = 3 * that._l01_a * (that._l01_a + that._l12_a);
+    x1 = (x1 * a - that._x0 * that._l12_2a + that._x2 * that._l01_2a) / n;
+    y1 = (y1 * a - that._y0 * that._l12_2a + that._y2 * that._l01_2a) / n;
+  }
+
+  if (that._l23_a > epsilon) {
+    var b = 2 * that._l23_2a + 3 * that._l23_a * that._l12_a + that._l12_2a,
+        m = 3 * that._l23_a * (that._l23_a + that._l12_a);
+    x2 = (x2 * b + that._x1 * that._l23_2a - x * that._l12_2a) / m;
+    y2 = (y2 * b + that._y1 * that._l23_2a - y * that._l12_2a) / m;
+  }
+
+  that._context.bezierCurveTo(x1, y1, x2, y2, that._x2, that._y2);
+}
+
+function CatmullRom(context, alpha) {
+  this._context = context;
+  this._alpha = alpha;
+}
+
+CatmullRom.prototype = {
+  areaStart: function() {
+    this._line = 0;
+  },
+  areaEnd: function() {
+    this._line = NaN;
+  },
+  lineStart: function() {
+    this._x0 = this._x1 = this._x2 =
+    this._y0 = this._y1 = this._y2 = NaN;
+    this._l01_a = this._l12_a = this._l23_a =
+    this._l01_2a = this._l12_2a = this._l23_2a =
+    this._point = 0;
+  },
+  lineEnd: function() {
+    switch (this._point) {
+      case 2: this._context.lineTo(this._x2, this._y2); break;
+      case 3: this.point(this._x2, this._y2); break;
+    }
+    if (this._line || (this._line !== 0 && this._point === 1)) this._context.closePath();
+    this._line = 1 - this._line;
+  },
+  point: function(x, y) {
+    x = +x, y = +y;
+
+    if (this._point) {
+      var x23 = this._x2 - x,
+          y23 = this._y2 - y;
+      this._l23_a = Math.sqrt(this._l23_2a = Math.pow(x23 * x23 + y23 * y23, this._alpha));
+    }
+
+    switch (this._point) {
+      case 0: this._point = 1; this._line ? this._context.lineTo(x, y) : this._context.moveTo(x, y); break;
+      case 1: this._point = 2; break;
+      case 2: this._point = 3; // proceed
+      default: point(this, x, y); break;
+    }
+
+    this._l01_a = this._l12_a, this._l12_a = this._l23_a;
+    this._l01_2a = this._l12_2a, this._l12_2a = this._l23_2a;
+    this._x0 = this._x1, this._x1 = this._x2, this._x2 = x;
+    this._y0 = this._y1, this._y1 = this._y2, this._y2 = y;
+  }
+};
+
+export default (function custom(alpha) {
+
+  function catmullRom(context) {
+    return alpha ? new CatmullRom(context, alpha) : new Cardinal(context, 0);
+  }
+
+  catmullRom.alpha = function(alpha) {
+    return custom(+alpha);
+  };
+
+  return catmullRom;
+})(0.5);

node_modules/d3-shape/src/curve/catmullRomClosed.js

@@ -0,0 +1,74 @@
+import {CardinalClosed} from "./cardinalClosed.js";
+import noop from "../noop.js";
+import {point} from "./catmullRom.js";
+
+function CatmullRomClosed(context, alpha) {
+  this._context = context;
+  this._alpha = alpha;
+}
+
+CatmullRomClosed.prototype = {
+  areaStart: noop,
+  areaEnd: noop,
+  lineStart: function() {
+    this._x0 = this._x1 = this._x2 = this._x3 = this._x4 = this._x5 =
+    this._y0 = this._y1 = this._y2 = this._y3 = this._y4 = this._y5 = NaN;
+    this._l01_a = this._l12_a = this._l23_a =
+    this._l01_2a = this._l12_2a = this._l23_2a =
+    this._point = 0;
+  },
+  lineEnd: function() {
+    switch (this._point) {
+      case 1: {
+        this._context.moveTo(this._x3, this._y3);
+        this._context.closePath();
+        break;
+      }
+      case 2: {
+        this._context.lineTo(this._x3, this._y3);
+        this._context.closePath();
+        break;
+      }
+      case 3: {
+        this.point(this._x3, this._y3);
+        this.point(this._x4, this._y4);
+        this.point(this._x5, this._y5);
+        break;
+      }
+    }
+  },
+  point: function(x, y) {
+    x = +x, y = +y;
+
+    if (this._point) {
+      var x23 = this._x2 - x,
+          y23 = this._y2 - y;
+      this._l23_a = Math.sqrt(this._l23_2a = Math.pow(x23 * x23 + y23 * y23, this._alpha));
+    }
+
+    switch (this._point) {
+      case 0: this._point = 1; this._x3 = x, this._y3 = y; break;
+      case 1: this._point = 2; this._context.moveTo(this._x4 = x, this._y4 = y); break;
+      case 2: this._point = 3; this._x5 = x, this._y5 = y; break;
+      default: point(this, x, y); break;
+    }
+
+    this._l01_a = this._l12_a, this._l12_a = this._l23_a;
+    this._l01_2a = this._l12_2a, this._l12_2a = this._l23_2a;
+    this._x0 = this._x1, this._x1 = this._x2, this._x2 = x;
+    this._y0 = this._y1, this._y1 = this._y2, this._y2 = y;
+  }
+};
+
+export default (function custom(alpha) {
+
+  function catmullRom(context) {
+    return alpha ? new CatmullRomClosed(context, alpha) : new CardinalClosed(context, 0);
+  }
+
+  catmullRom.alpha = function(alpha) {
+    return custom(+alpha);
+  };
+
+  return catmullRom;
+})(0.5);

node_modules/d3-shape/src/curve/catmullRomOpen.js

@@ -0,0 +1,62 @@
+import {CardinalOpen} from "./cardinalOpen.js";
+import {point} from "./catmullRom.js";
+
+function CatmullRomOpen(context, alpha) {
+  this._context = context;
+  this._alpha = alpha;
+}
+
+CatmullRomOpen.prototype = {
+  areaStart: function() {
+    this._line = 0;
+  },
+  areaEnd: function() {
+    this._line = NaN;
+  },
+  lineStart: function() {
+    this._x0 = this._x1 = this._x2 =
+    this._y0 = this._y1 = this._y2 = NaN;
+    this._l01_a = this._l12_a = this._l23_a =
+    this._l01_2a = this._l12_2a = this._l23_2a =
+    this._point = 0;
+  },
+  lineEnd: function() {
+    if (this._line || (this._line !== 0 && this._point === 3)) this._context.closePath();
+    this._line = 1 - this._line;
+  },
+  point: function(x, y) {
+    x = +x, y = +y;
+
+    if (this._point) {
+      var x23 = this._x2 - x,
+          y23 = this._y2 - y;
+      this._l23_a = Math.sqrt(this._l23_2a = Math.pow(x23 * x23 + y23 * y23, this._alpha));
+    }
+
+    switch (this._point) {
+      case 0: this._point = 1; break;
+      case 1: this._point = 2; break;
+      case 2: this._point = 3; this._line ? this._context.lineTo(this._x2, this._y2) : this._context.moveTo(this._x2, this._y2); break;
+      case 3: this._point = 4; // proceed
+      default: point(this, x, y); break;
+    }
+
+    this._l01_a = this._l12_a, this._l12_a = this._l23_a;
+    this._l01_2a = this._l12_2a, this._l12_2a = this._l23_2a;
+    this._x0 = this._x1, this._x1 = this._x2, this._x2 = x;
+    this._y0 = this._y1, this._y1 = this._y2, this._y2 = y;
+  }
+};
+
+export default (function custom(alpha) {
+
+  function catmullRom(context) {
+    return alpha ? new CatmullRomOpen(context, alpha) : new CardinalOpen(context, 0);
+  }
+
+  catmullRom.alpha = function(alpha) {
+    return custom(+alpha);
+  };
+
+  return catmullRom;
+})(0.5);

node_modules/d3-shape/src/curve/linear.js

@@ -0,0 +1,31 @@
+function Linear(context) {
+  this._context = context;
+}
+
+Linear.prototype = {
+  areaStart: function() {
+    this._line = 0;
+  },
+  areaEnd: function() {
+    this._line = NaN;
+  },
+  lineStart: function() {
+    this._point = 0;
+  },
+  lineEnd: function() {
+    if (this._line || (this._line !== 0 && this._point === 1)) this._context.closePath();
+    this._line = 1 - this._line;
+  },
+  point: function(x, y) {
+    x = +x, y = +y;
+    switch (this._point) {
+      case 0: this._point = 1; this._line ? this._context.lineTo(x, y) : this._context.moveTo(x, y); break;
+      case 1: this._point = 2; // proceed
+      default: this._context.lineTo(x, y); break;
+    }
+  }
+};
+
+export default function(context) {
+  return new Linear(context);
+}

node_modules/d3-shape/src/curve/linearClosed.js

@@ -0,0 +1,25 @@
+import noop from "../noop.js";
+
+function LinearClosed(context) {
+  this._context = context;
+}
+
+LinearClosed.prototype = {
+  areaStart: noop,
+  areaEnd: noop,
+  lineStart: function() {
+    this._point = 0;
+  },
+  lineEnd: function() {
+    if (this._point) this._context.closePath();
+  },
+  point: function(x, y) {
+    x = +x, y = +y;
+    if (this._point) this._context.lineTo(x, y);
+    else this._point = 1, this._context.moveTo(x, y);
+  }
+};
+
+export default function(context) {
+  return new LinearClosed(context);
+}

node_modules/d3-shape/src/curve/monotone.js

@@ -0,0 +1,104 @@
+function sign(x) {
+  return x < 0 ? -1 : 1;
+}
+
+// Calculate the slopes of the tangents (Hermite-type interpolation) based on
+// the following paper: Steffen, M. 1990. A Simple Method for Monotonic
+// Interpolation in One Dimension. Astronomy and Astrophysics, Vol. 239, NO.
+// NOV(II), P. 443, 1990.
+function slope3(that, x2, y2) {
+  var h0 = that._x1 - that._x0,
+      h1 = x2 - that._x1,
+      s0 = (that._y1 - that._y0) / (h0 || h1 < 0 && -0),
+      s1 = (y2 - that._y1) / (h1 || h0 < 0 && -0),
+      p = (s0 * h1 + s1 * h0) / (h0 + h1);
+  return (sign(s0) + sign(s1)) * Math.min(Math.abs(s0), Math.abs(s1), 0.5 * Math.abs(p)) || 0;
+}
+
+// Calculate a one-sided slope.
+function slope2(that, t) {
+  var h = that._x1 - that._x0;
+  return h ? (3 * (that._y1 - that._y0) / h - t) / 2 : t;
+}
+
+// According to https://en.wikipedia.org/wiki/Cubic_Hermite_spline#Representations
+// "you can express cubic Hermite interpolation in terms of cubic Bézier curves
+// with respect to the four values p0, p0 + m0 / 3, p1 - m1 / 3, p1".
+function point(that, t0, t1) {
+  var x0 = that._x0,
+      y0 = that._y0,
+      x1 = that._x1,
+      y1 = that._y1,
+      dx = (x1 - x0) / 3;
+  that._context.bezierCurveTo(x0 + dx, y0 + dx * t0, x1 - dx, y1 - dx * t1, x1, y1);
+}
+
+function MonotoneX(context) {
+  this._context = context;
+}
+
+MonotoneX.prototype = {
+  areaStart: function() {
+    this._line = 0;
+  },
+  areaEnd: function() {
+    this._line = NaN;
+  },
+  lineStart: function() {
+    this._x0 = this._x1 =
+    this._y0 = this._y1 =
+    this._t0 = NaN;
+    this._point = 0;
+  },
+  lineEnd: function() {
+    switch (this._point) {
+      case 2: this._context.lineTo(this._x1, this._y1); break;
+      case 3: point(this, this._t0, slope2(this, this._t0)); break;
+    }
+    if (this._line || (this._line !== 0 && this._point === 1)) this._context.closePath();
+    this._line = 1 - this._line;
+  },
+  point: function(x, y) {
+    var t1 = NaN;
+
+    x = +x, y = +y;
+    if (x === this._x1 && y === this._y1) return; // Ignore coincident points.
+    switch (this._point) {
+      case 0: this._point = 1; this._line ? this._context.lineTo(x, y) : this._context.moveTo(x, y); break;
+      case 1: this._point = 2; break;
+      case 2: this._point = 3; point(this, slope2(this, t1 = slope3(this, x, y)), t1); break;
+      default: point(this, this._t0, t1 = slope3(this, x, y)); break;
+    }
+
+    this._x0 = this._x1, this._x1 = x;
+    this._y0 = this._y1, this._y1 = y;
+    this._t0 = t1;
+  }
+}
+
+function MonotoneY(context) {
+  this._context = new ReflectContext(context);
+}
+
+(MonotoneY.prototype = Object.create(MonotoneX.prototype)).point = function(x, y) {
+  MonotoneX.prototype.point.call(this, y, x);
+};
+
+function ReflectContext(context) {
+  this._context = context;
+}
+
+ReflectContext.prototype = {
+  moveTo: function(x, y) { this._context.moveTo(y, x); },
+  closePath: function() { this._context.closePath(); },
+  lineTo: function(x, y) { this._context.lineTo(y, x); },
+  bezierCurveTo: function(x1, y1, x2, y2, x, y) { this._context.bezierCurveTo(y1, x1, y2, x2, y, x); }
+};
+
+export function monotoneX(context) {
+  return new MonotoneX(context);
+}
+
+export function monotoneY(context) {
+  return new MonotoneY(context);
+}

node_modules/d3-shape/src/curve/natural.js

@@ -0,0 +1,65 @@
+function Natural(context) {
+  this._context = context;
+}
+
+Natural.prototype = {
+  areaStart: function() {
+    this._line = 0;
+  },
+  areaEnd: function() {
+    this._line = NaN;
+  },
+  lineStart: function() {
+    this._x = [];
+    this._y = [];
+  },
+  lineEnd: function() {
+    var x = this._x,
+        y = this._y,
+        n = x.length;
+
+    if (n) {
+      this._line ? this._context.lineTo(x[0], y[0]) : this._context.moveTo(x[0], y[0]);
+      if (n === 2) {
+        this._context.lineTo(x[1], y[1]);
+      } else {
+        var px = controlPoints(x),
+            py = controlPoints(y);
+        for (var i0 = 0, i1 = 1; i1 < n; ++i0, ++i1) {
+          this._context.bezierCurveTo(px[0][i0], py[0][i0], px[1][i0], py[1][i0], x[i1], y[i1]);
+        }
+      }
+    }
+
+    if (this._line || (this._line !== 0 && n === 1)) this._context.closePath();
+    this._line = 1 - this._line;
+    this._x = this._y = null;
+  },
+  point: function(x, y) {
+    this._x.push(+x);
+    this._y.push(+y);
+  }
+};
+
+// See https://www.particleincell.com/2012/bezier-splines/ for derivation.
+function controlPoints(x) {
+  var i,
+      n = x.length - 1,
+      m,
+      a = new Array(n),
+      b = new Array(n),
+      r = new Array(n);
+  a[0] = 0, b[0] = 2, r[0] = x[0] + 2 * x[1];
+  for (i = 1; i < n - 1; ++i) a[i] = 1, b[i] = 4, r[i] = 4 * x[i] + 2 * x[i + 1];
+  a[n - 1] = 2, b[n - 1] = 7, r[n - 1] = 8 * x[n - 1] + x[n];
+  for (i = 1; i < n; ++i) m = a[i] / b[i - 1], b[i] -= m, r[i] -= m * r[i - 1];
+  a[n - 1] = r[n - 1] / b[n - 1];
+  for (i = n - 2; i >= 0; --i) a[i] = (r[i] - a[i + 1]) / b[i];
+  b[n - 1] = (x[n] + a[n - 1]) / 2;
+  for (i = 0; i < n - 1; ++i) b[i] = 2 * x[i + 1] - a[i + 1];
+  return [a, b];
+}
+
+export default function(context) {
+  return new Natural(context);
+}

node_modules/d3-shape/src/curve/radial.js

@@ -0,0 +1,36 @@
+import curveLinear from "./linear.js";
+
+export var curveRadialLinear = curveRadial(curveLinear);
+
+function Radial(curve) {
+  this._curve = curve;
+}
+
+Radial.prototype = {
+  areaStart: function() {
+    this._curve.areaStart();
+  },
+  areaEnd: function() {
+    this._curve.areaEnd();
+  },
+  lineStart: function() {
+    this._curve.lineStart();
+  },
+  lineEnd: function() {
+    this._curve.lineEnd();
+  },
+  point: function(a, r) {
+    this._curve.point(r * Math.sin(a), r * -Math.cos(a));
+  }
+};
+
+export default function curveRadial(curve) {
+
+  function radial(context) {
+    return new Radial(curve(context));
+  }
+
+  radial._curve = curve;
+
+  return radial;
+}

node_modules/d3-shape/src/curve/step.js

@@ -0,0 +1,53 @@
+function Step(context, t) {
+  this._context = context;
+  this._t = t;
+}
+
+Step.prototype = {
+  areaStart: function() {
+    this._line = 0;
+  },
+  areaEnd: function() {
+    this._line = NaN;
+  },
+  lineStart: function() {
+    this._x = this._y = NaN;
+    this._point = 0;
+  },
+  lineEnd: function() {
+    if (0 < this._t && this._t < 1 && this._point === 2) this._context.lineTo(this._x, this._y);
+    if (this._line || (this._line !== 0 && this._point === 1)) this._context.closePath();
+    if (this._line >= 0) this._t = 1 - this._t, this._line = 1 - this._line;
+  },
+  point: function(x, y) {
+    x = +x, y = +y;
+    switch (this._point) {
+      case 0: this._point = 1; this._line ? this._context.lineTo(x, y) : this._context.moveTo(x, y); break;
+      case 1: this._point = 2; // proceed
+      default: {
+        if (this._t <= 0) {
+          this._context.lineTo(this._x, y);
+          this._context.lineTo(x, y);
+        } else {
+          var x1 = this._x * (1 - this._t) + x * this._t;
+          this._context.lineTo(x1, this._y);
+          this._context.lineTo(x1, y);
+        }
+        break;
+      }
+    }
+    this._x = x, this._y = y;
+  }
+};
+
+export default function(context) {
+  return new Step(context, 0.5);
+}
+
+export function stepBefore(context) {
+  return new Step(context, 0);
+}
+
+export function stepAfter(context) {
+  return new Step(context, 1);
+}

node_modules/d3-shape/src/descending.js

@@ -0,0 +1,3 @@
+export default function(a, b) {
+  return b < a ? -1 : b > a ? 1 : b >= a ? 0 : NaN;
+}

node_modules/d3-shape/src/identity.js

@@ -0,0 +1,3 @@
+export default function(d) {
+  return d;
+}

node_modules/d3-shape/src/index.js

@@ -0,0 +1,46 @@
+export {default as arc} from "./arc.js";
+export {default as area} from "./area.js";
+export {default as line} from "./line.js";
+export {default as pie} from "./pie.js";
+export {default as areaRadial, default as radialArea} from "./areaRadial.js"; // Note: radialArea is deprecated!
+export {default as lineRadial, default as radialLine} from "./lineRadial.js"; // Note: radialLine is deprecated!
+export {default as pointRadial} from "./pointRadial.js";
+export {linkHorizontal, linkVertical, linkRadial} from "./link/index.js";
+
+export {default as symbol, symbols} from "./symbol.js";
+export {default as symbolCircle} from "./symbol/circle.js";
+export {default as symbolCross} from "./symbol/cross.js";
+export {default as symbolDiamond} from "./symbol/diamond.js";
+export {default as symbolSquare} from "./symbol/square.js";
+export {default as symbolStar} from "./symbol/star.js";
+export {default as symbolTriangle} from "./symbol/triangle.js";
+export {default as symbolWye} from "./symbol/wye.js";
+
+export {default as curveBasisClosed} from "./curve/basisClosed.js";
+export {default as curveBasisOpen} from "./curve/basisOpen.js";
+export {default as curveBasis} from "./curve/basis.js";
+export {default as curveBundle} from "./curve/bundle.js";
+export {default as curveCardinalClosed} from "./curve/cardinalClosed.js";
+export {default as curveCardinalOpen} from "./curve/cardinalOpen.js";
+export {default as curveCardinal} from "./curve/cardinal.js";
+export {default as curveCatmullRomClosed} from "./curve/catmullRomClosed.js";
+export {default as curveCatmullRomOpen} from "./curve/catmullRomOpen.js";
+export {default as curveCatmullRom} from "./curve/catmullRom.js";
+export {default as curveLinearClosed} from "./curve/linearClosed.js";
+export {default as curveLinear} from "./curve/linear.js";
+export {monotoneX as curveMonotoneX, monotoneY as curveMonotoneY} from "./curve/monotone.js";
+export {default as curveNatural} from "./curve/natural.js";
+export {default as curveStep, stepAfter as curveStepAfter, stepBefore as curveStepBefore} from "./curve/step.js";
+
+export {default as stack} from "./stack.js";
+export {default as stackOffsetExpand} from "./offset/expand.js";
+export {default as stackOffsetDiverging} from "./offset/diverging.js";
+export {default as stackOffsetNone} from "./offset/none.js";
+export {default as stackOffsetSilhouette} from "./offset/silhouette.js";
+export {default as stackOffsetWiggle} from "./offset/wiggle.js";
+export {default as stackOrderAppearance} from "./order/appearance.js";
+export {default as stackOrderAscending} from "./order/ascending.js";
+export {default as stackOrderDescending} from "./order/descending.js";
+export {default as stackOrderInsideOut} from "./order/insideOut.js";
+export {default as stackOrderNone} from "./order/none.js";
+export {default as stackOrderReverse} from "./order/reverse.js";

node_modules/d3-shape/src/line.js

@@ -0,0 +1,55 @@
+import {path} from "d3-path";
+import constant from "./constant.js";
+import curveLinear from "./curve/linear.js";
+import {x as pointX, y as pointY} from "./point.js";
+
+export default function() {
+  var x = pointX,
+      y = pointY,
+      defined = constant(true),
+      context = null,
+      curve = curveLinear,
+      output = null;
+
+  function line(data) {
+    var i,
+        n = data.length,
+        d,
+        defined0 = false,
+        buffer;
+
+    if (context == null) output = curve(buffer = path());
+
+    for (i = 0; i <= n; ++i) {
+      if (!(i < n && defined(d = data[i], i, data)) === defined0) {
+        if (defined0 = !defined0) output.lineStart();
+        else output.lineEnd();
+      }
+      if (defined0) output.point(+x(d, i, data), +y(d, i, data));
+    }
+
+    if (buffer) return output = null, buffer + "" || null;
+  }
+
+  line.x = function(_) {
+    return arguments.length ? (x = typeof _ === "function" ? _ : constant(+_), line) : x;
+  };
+
+  line.y = function(_) {
+    return arguments.length ? (y = typeof _ === "function" ? _ : constant(+_), line) : y;
+  };
+
+  line.defined = function(_) {
+    return arguments.length ? (defined = typeof _ === "function" ? _ : constant(!!_), line) : defined;
+  };
+
+  line.curve = function(_) {
+    return arguments.length ? (curve = _, context != null && (output = curve(context)), line) : curve;
+  };
+
+  line.context = function(_) {
+    return arguments.length ? (_ == null ? context = output = null : output = curve(context = _), line) : context;
+  };
+
+  return line;
+}

node_modules/d3-shape/src/lineRadial.js

@@ -0,0 +1,19 @@
+import curveRadial, {curveRadialLinear} from "./curve/radial.js";
+import line from "./line.js";
+
+export function lineRadial(l) {
+  var c = l.curve;
+
+  l.angle = l.x, delete l.x;
+  l.radius = l.y, delete l.y;
+
+  l.curve = function(_) {
+    return arguments.length ? c(curveRadial(_)) : c()._curve;
+  };
+
+  return l;
+}
+
+export default function() {
+  return lineRadial(line().curve(curveRadialLinear));
+}

node_modules/d3-shape/src/link/index.js

@@ -0,0 +1,84 @@
+import {path} from "d3-path";
+import {slice} from "../array.js";
+import constant from "../constant.js";
+import {x as pointX, y as pointY} from "../point.js";
+import pointRadial from "../pointRadial.js";
+
+function linkSource(d) {
+  return d.source;
+}
+
+function linkTarget(d) {
+  return d.target;
+}
+
+function link(curve) {
+  var source = linkSource,
+      target = linkTarget,
+      x = pointX,
+      y = pointY,
+      context = null;
+
+  function link() {
+    var buffer, argv = slice.call(arguments), s = source.apply(this, argv), t = target.apply(this, argv);
+    if (!context) context = buffer = path();
+    curve(context, +x.apply(this, (argv[0] = s, argv)), +y.apply(this, argv), +x.apply(this, (argv[0] = t, argv)), +y.apply(this, argv));
+    if (buffer) return context = null, buffer + "" || null;
+  }
+
+  link.source = function(_) {
+    return arguments.length ? (source = _, link) : source;
+  };
+
+  link.target = function(_) {
+    return arguments.length ? (target = _, link) : target;
+  };
+
+  link.x = function(_) {
+    return arguments.length ? (x = typeof _ === "function" ? _ : constant(+_), link) : x;
+  };
+
+  link.y = function(_) {
+    return arguments.length ? (y = typeof _ === "function" ? _ : constant(+_), link) : y;
+  };
+
+  link.context = function(_) {
+    return arguments.length ? ((context = _ == null ? null : _), link) : context;
+  };
+
+  return link;
+}
+
+function curveHorizontal(context, x0, y0, x1, y1) {
+  context.moveTo(x0, y0);
+  context.bezierCurveTo(x0 = (x0 + x1) / 2, y0, x0, y1, x1, y1);
+}
+
+function curveVertical(context, x0, y0, x1, y1) {
+  context.moveTo(x0, y0);
+  context.bezierCurveTo(x0, y0 = (y0 + y1) / 2, x1, y0, x1, y1);
+}
+
+function curveRadial(context, x0, y0, x1, y1) {
+  var p0 = pointRadial(x0, y0),
+      p1 = pointRadial(x0, y0 = (y0 + y1) / 2),
+      p2 = pointRadial(x1, y0),
+      p3 = pointRadial(x1, y1);
+  context.moveTo(p0[0], p0[1]);
+  context.bezierCurveTo(p1[0], p1[1], p2[0], p2[1], p3[0], p3[1]);
+}
+
+export function linkHorizontal() {
+  return link(curveHorizontal);
+}
+
+export function linkVertical() {
+  return link(curveVertical);
+}
+
+export function linkRadial() {
+  var l = link(curveRadial);
+  l.angle = l.x, delete l.x;
+  l.radius = l.y, delete l.y;
+  return l;
+}

node_modules/d3-shape/src/math.js

@@ -0,0 +1,20 @@
+export var abs = Math.abs;
+export var atan2 = Math.atan2;
+export var cos = Math.cos;
+export var max = Math.max;
+export var min = Math.min;
+export var sin = Math.sin;
+export var sqrt = Math.sqrt;
+
+export var epsilon = 1e-12;
+export var pi = Math.PI;
+export var halfPi = pi / 2;
+export var tau = 2 * pi;
+
+export function acos(x) {
+  return x > 1 ? 0 : x < -1 ? pi : Math.acos(x);
+}
+
+export function asin(x) {
+  return x >= 1 ? halfPi : x <= -1 ? -halfPi : Math.asin(x);
+}

node_modules/d3-shape/src/noop.js

@@ -0,0 +1 @@
+export default function() {}

node_modules/d3-shape/src/offset/diverging.js

@@ -0,0 +1,14 @@
+export default function(series, order) {
+  if (!((n = series.length) > 0)) return;
+  for (var i, j = 0, d, dy, yp, yn, n, m = series[order[0]].length; j < m; ++j) {
+    for (yp = yn = 0, i = 0; i < n; ++i) {
+      if ((dy = (d = series[order[i]][j])[1] - d[0]) > 0) {
+        d[0] = yp, d[1] = yp += dy;
+      } else if (dy < 0) {
+        d[1] = yn, d[0] = yn += dy;
+      } else {
+        d[0] = 0, d[1] = dy;
+      }
+    }
+  }
+}

node_modules/d3-shape/src/offset/expand.js

@@ -0,0 +1,10 @@
+import none from "./none.js";
+
+export default function(series, order) {
+  if (!((n = series.length) > 0)) return;
+  for (var i, n, j = 0, m = series[0].length, y; j < m; ++j) {
+    for (y = i = 0; i < n; ++i) y += series[i][j][1] || 0;
+    if (y) for (i = 0; i < n; ++i) series[i][j][1] /= y;
+  }
+  none(series, order);
+}

node_modules/d3-shape/src/offset/none.js

@@ -0,0 +1,9 @@
+export default function(series, order) {
+  if (!((n = series.length) > 1)) return;
+  for (var i = 1, j, s0, s1 = series[order[0]], n, m = s1.length; i < n; ++i) {
+    s0 = s1, s1 = series[order[i]];
+    for (j = 0; j < m; ++j) {
+      s1[j][1] += s1[j][0] = isNaN(s0[j][1]) ? s0[j][0] : s0[j][1];
+    }
+  }
+}

node_modules/d3-shape/src/offset/silhouette.js

@@ -0,0 +1,10 @@
+import none from "./none.js";
+
+export default function(series, order) {
+  if (!((n = series.length) > 0)) return;
+  for (var j = 0, s0 = series[order[0]], n, m = s0.length; j < m; ++j) {
+    for (var i = 0, y = 0; i < n; ++i) y += series[i][j][1] || 0;
+    s0[j][1] += s0[j][0] = -y / 2;
+  }
+  none(series, order);
+}

node_modules/d3-shape/src/offset/wiggle.js

@@ -0,0 +1,24 @@
+import none from "./none.js";
+
+export default function(series, order) {
+  if (!((n = series.length) > 0) || !((m = (s0 = series[order[0]]).length) > 0)) return;
+  for (var y = 0, j = 1, s0, m, n; j < m; ++j) {
+    for (var i = 0, s1 = 0, s2 = 0; i < n; ++i) {
+      var si = series[order[i]],
+          sij0 = si[j][1] || 0,
+          sij1 = si[j - 1][1] || 0,
+          s3 = (sij0 - sij1) / 2;
+      for (var k = 0; k < i; ++k) {
+        var sk = series[order[k]],
+            skj0 = sk[j][1] || 0,
+            skj1 = sk[j - 1][1] || 0;
+        s3 += skj0 - skj1;
+      }
+      s1 += sij0, s2 += s3 * sij0;
+    }
+    s0[j - 1][1] += s0[j - 1][0] = y;
+    if (s1) y -= s2 / s1;
+  }
+  s0[j - 1][1] += s0[j - 1][0] = y;
+  none(series, order);
+}

node_modules/d3-shape/src/order/appearance.js

@@ -0,0 +1,12 @@
+import none from "./none.js";
+
+export default function(series) {
+  var peaks = series.map(peak);
+  return none(series).sort(function(a, b) { return peaks[a] - peaks[b]; });
+}
+
+function peak(series) {
+  var i = -1, j = 0, n = series.length, vi, vj = -Infinity;
+  while (++i < n) if ((vi = +series[i][1]) > vj) vj = vi, j = i;
+  return j;
+}

node_modules/d3-shape/src/order/ascending.js

@@ -0,0 +1,12 @@
+import none from "./none.js";
+
+export default function(series) {
+  var sums = series.map(sum);
+  return none(series).sort(function(a, b) { return sums[a] - sums[b]; });
+}
+
+export function sum(series) {
+  var s = 0, i = -1, n = series.length, v;
+  while (++i < n) if (v = +series[i][1]) s += v;
+  return s;
+}

node_modules/d3-shape/src/order/descending.js

@@ -0,0 +1,5 @@
+import ascending from "./ascending.js";
+
+export default function(series) {
+  return ascending(series).reverse();
+}

node_modules/d3-shape/src/order/insideOut.js

@@ -0,0 +1,27 @@
+import appearance from "./appearance.js";
+import {sum} from "./ascending.js";
+
+export default function(series) {
+  var n = series.length,
+      i,
+      j,
+      sums = series.map(sum),
+      order = appearance(series),
+      top = 0,
+      bottom = 0,
+      tops = [],
+      bottoms = [];
+
+  for (i = 0; i < n; ++i) {
+    j = order[i];
+    if (top < bottom) {
+      top += sums[j];
+      tops.push(j);
+    } else {
+      bottom += sums[j];
+      bottoms.push(j);
+    }
+  }
+
+  return bottoms.reverse().concat(tops);
+}

node_modules/d3-shape/src/order/none.js

@@ -0,0 +1,5 @@
+export default function(series) {
+  var n = series.length, o = new Array(n);
+  while (--n >= 0) o[n] = n;
+  return o;
+}

node_modules/d3-shape/src/order/reverse.js

@@ -0,0 +1,5 @@
+import none from "./none.js";
+
+export default function(series) {
+  return none(series).reverse();
+}

node_modules/d3-shape/src/pie.js

@@ -0,0 +1,79 @@
+import constant from "./constant.js";
+import descending from "./descending.js";
+import identity from "./identity.js";
+import {tau} from "./math.js";
+
+export default function() {
+  var value = identity,
+      sortValues = descending,
+      sort = null,
+      startAngle = constant(0),
+      endAngle = constant(tau),
+      padAngle = constant(0);
+
+  function pie(data) {
+    var i,
+        n = data.length,
+        j,
+        k,
+        sum = 0,
+        index = new Array(n),
+        arcs = new Array(n),
+        a0 = +startAngle.apply(this, arguments),
+        da = Math.min(tau, Math.max(-tau, endAngle.apply(this, arguments) - a0)),
+        a1,
+        p = Math.min(Math.abs(da) / n, padAngle.apply(this, arguments)),
+        pa = p * (da < 0 ? -1 : 1),
+        v;
+
+    for (i = 0; i < n; ++i) {
+      if ((v = arcs[index[i] = i] = +value(data[i], i, data)) > 0) {
+        sum += v;
+      }
+    }
+
+    // Optionally sort the arcs by previously-computed values or by data.
+    if (sortValues != null) index.sort(function(i, j) { return sortValues(arcs[i], arcs[j]); });
+    else if (sort != null) index.sort(function(i, j) { return sort(data[i], data[j]); });
+
+    // Compute the arcs! They are stored in the original data's order.
+    for (i = 0, k = sum ? (da - n * pa) / sum : 0; i < n; ++i, a0 = a1) {
+      j = index[i], v = arcs[j], a1 = a0 + (v > 0 ? v * k : 0) + pa, arcs[j] = {
+        data: data[j],
+        index: i,
+        value: v,
+        startAngle: a0,
+        endAngle: a1,
+        padAngle: p
+      };
+    }
+
+    return arcs;
+  }
+
+  pie.value = function(_) {
+    return arguments.length ? (value = typeof _ === "function" ? _ : constant(+_), pie) : value;
+  };
+
+  pie.sortValues = function(_) {
+    return arguments.length ? (sortValues = _, sort = null, pie) : sortValues;
+  };
+
+  pie.sort = function(_) {
+    return arguments.length ? (sort = _, sortValues = null, pie) : sort;
+  };
+
+  pie.startAngle = function(_) {
+    return arguments.length ? (startAngle = typeof _ === "function" ? _ : constant(+_), pie) : startAngle;
+  };
+
+  pie.endAngle = function(_) {
+    return arguments.length ? (endAngle = typeof _ === "function" ? _ : constant(+_), pie) : endAngle;
+  };
+
+  pie.padAngle = function(_) {
+    return arguments.length ? (padAngle = typeof _ === "function" ? _ : constant(+_), pie) : padAngle;
+  };
+
+  return pie;
+}

node_modules/d3-shape/src/point.js

@@ -0,0 +1,7 @@
+export function x(p) {
+  return p[0];
+}
+
+export function y(p) {
+  return p[1];
+}

node_modules/d3-shape/src/pointRadial.js

@@ -0,0 +1,3 @@
+export default function(x, y) {
+  return [(y = +y) * Math.cos(x -= Math.PI / 2), y * Math.sin(x)];
+}

node_modules/d3-shape/src/stack.js

@@ -0,0 +1,57 @@
+import {slice} from "./array.js";
+import constant from "./constant.js";
+import offsetNone from "./offset/none.js";
+import orderNone from "./order/none.js";
+
+function stackValue(d, key) {
+  return d[key];
+}
+
+export default function() {
+  var keys = constant([]),
+      order = orderNone,
+      offset = offsetNone,
+      value = stackValue;
+
+  function stack(data) {
+    var kz = keys.apply(this, arguments),
+        i,
+        m = data.length,
+        n = kz.length,
+        sz = new Array(n),
+        oz;
+
+    for (i = 0; i < n; ++i) {
+      for (var ki = kz[i], si = sz[i] = new Array(m), j = 0, sij; j < m; ++j) {
+        si[j] = sij = [0, +value(data[j], ki, j, data)];
+        sij.data = data[j];
+      }
+      si.key = ki;
+    }
+
+    for (i = 0, oz = order(sz); i < n; ++i) {
+      sz[oz[i]].index = i;
+    }
+
+    offset(sz, oz);
+    return sz;
+  }
+
+  stack.keys = function(_) {
+    return arguments.length ? (keys = typeof _ === "function" ? _ : constant(slice.call(_)), stack) : keys;
+  };
+
+  stack.value = function(_) {
+    return arguments.length ? (value = typeof _ === "function" ? _ : constant(+_), stack) : value;
+  };
+
+  stack.order = function(_) {
+    return arguments.length ? (order = _ == null ? orderNone : typeof _ === "function" ? _ : constant(slice.call(_)), stack) : order;
+  };
+
+  stack.offset = function(_) {
+    return arguments.length ? (offset = _ == null ? offsetNone : _, stack) : offset;
+  };
+
+  return stack;
+}

node_modules/d3-shape/src/symbol.js

@@ -0,0 +1,46 @@
+import {path} from "d3-path";
+import circle from "./symbol/circle.js";
+import cross from "./symbol/cross.js";
+import diamond from "./symbol/diamond.js";
+import star from "./symbol/star.js";
+import square from "./symbol/square.js";
+import triangle from "./symbol/triangle.js";
+import wye from "./symbol/wye.js";
+import constant from "./constant.js";
+
+export var symbols = [
+  circle,
+  cross,
+  diamond,
+  square,
+  star,
+  triangle,
+  wye
+];
+
+export default function() {
+  var type = constant(circle),
+      size = constant(64),
+      context = null;
+
+  function symbol() {
+    var buffer;
+    if (!context) context = buffer = path();
+    type.apply(this, arguments).draw(context, +size.apply(this, arguments));
+    if (buffer) return context = null, buffer + "" || null;
+  }
+
+  symbol.type = function(_) {
+    return arguments.length ? (type = typeof _ === "function" ? _ : constant(_), symbol) : type;
+  };
+
+  symbol.size = function(_) {
+    return arguments.length ? (size = typeof _ === "function" ? _ : constant(+_), symbol) : size;
+  };
+
+  symbol.context = function(_) {
+    return arguments.length ? (context = _ == null ? null : _, symbol) : context;
+  };
+
+  return symbol;
+}

node_modules/d3-shape/src/symbol/circle.js

@@ -0,0 +1,9 @@
+import {pi, tau} from "../math.js";
+
+export default {
+  draw: function(context, size) {
+    var r = Math.sqrt(size / pi);
+    context.moveTo(r, 0);
+    context.arc(0, 0, r, 0, tau);
+  }
+};

node_modules/d3-shape/src/symbol/cross.js

@@ -0,0 +1,18 @@
+export default {
+  draw: function(context, size) {
+    var r = Math.sqrt(size / 5) / 2;
+    context.moveTo(-3 * r, -r);
+    context.lineTo(-r, -r);
+    context.lineTo(-r, -3 * r);
+    context.lineTo(r, -3 * r);
+    context.lineTo(r, -r);
+    context.lineTo(3 * r, -r);
+    context.lineTo(3 * r, r);
+    context.lineTo(r, r);
+    context.lineTo(r, 3 * r);
+    context.lineTo(-r, 3 * r);
+    context.lineTo(-r, r);
+    context.lineTo(-3 * r, r);
+    context.closePath();
+  }
+};

node_modules/d3-shape/src/symbol/diamond.js

@@ -0,0 +1,14 @@
+var tan30 = Math.sqrt(1 / 3),
+    tan30_2 = tan30 * 2;
+
+export default {
+  draw: function(context, size) {
+    var y = Math.sqrt(size / tan30_2),
+        x = y * tan30;
+    context.moveTo(0, -y);
+    context.lineTo(x, 0);
+    context.lineTo(0, y);
+    context.lineTo(-x, 0);
+    context.closePath();
+  }
+};

node_modules/d3-shape/src/symbol/square.js

@@ -0,0 +1,7 @@
+export default {
+  draw: function(context, size) {
+    var w = Math.sqrt(size),
+        x = -w / 2;
+    context.rect(x, x, w, w);
+  }
+};

node_modules/d3-shape/src/symbol/star.js

@@ -0,0 +1,24 @@
+import {pi, tau} from "../math.js";
+
+var ka = 0.89081309152928522810,
+    kr = Math.sin(pi / 10) / Math.sin(7 * pi / 10),
+    kx = Math.sin(tau / 10) * kr,
+    ky = -Math.cos(tau / 10) * kr;
+
+export default {
+  draw: function(context, size) {
+    var r = Math.sqrt(size * ka),
+        x = kx * r,
+        y = ky * r;
+    context.moveTo(0, -r);
+    context.lineTo(x, y);
+    for (var i = 1; i < 5; ++i) {
+      var a = tau * i / 5,
+          c = Math.cos(a),
+          s = Math.sin(a);
+      context.lineTo(s * r, -c * r);
+      context.lineTo(c * x - s * y, s * x + c * y);
+    }
+    context.closePath();
+  }
+};

node_modules/d3-shape/src/symbol/triangle.js

@@ -0,0 +1,11 @@
+var sqrt3 = Math.sqrt(3);
+
+export default {
+  draw: function(context, size) {
+    var y = -Math.sqrt(size / (sqrt3 * 3));
+    context.moveTo(0, y * 2);
+    context.lineTo(-sqrt3 * y, -y);
+    context.lineTo(sqrt3 * y, -y);
+    context.closePath();
+  }
+};

node_modules/d3-shape/src/symbol/wye.js

@@ -0,0 +1,26 @@
+var c = -0.5,
+    s = Math.sqrt(3) / 2,
+    k = 1 / Math.sqrt(12),
+    a = (k / 2 + 1) * 3;
+
+export default {
+  draw: function(context, size) {
+    var r = Math.sqrt(size / a),
+        x0 = r / 2,
+        y0 = r * k,
+        x1 = x0,
+        y1 = r * k + r,
+        x2 = -x1,
+        y2 = y1;
+    context.moveTo(x0, y0);
+    context.lineTo(x1, y1);
+    context.lineTo(x2, y2);
+    context.lineTo(c * x0 - s * y0, s * x0 + c * y0);
+    context.lineTo(c * x1 - s * y1, s * x1 + c * y1);
+    context.lineTo(c * x2 - s * y2, s * x2 + c * y2);
+    context.lineTo(c * x0 + s * y0, c * y0 - s * x0);
+    context.lineTo(c * x1 + s * y1, c * y1 - s * x1);
+    context.lineTo(c * x2 + s * y2, c * y2 - s * x2);
+    context.closePath();
+  }
+};