This demonstrates how to interpolate strokes sequentially. Here, each meridian (line going up and down) is a group of individual segments.
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Chained stroke interpolation
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| license: mit | |
| height: 500 | |
| border: no |
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| { | |
| "env": { | |
| "browser": true, | |
| "es6": true | |
| }, | |
| "extends": "eslint:recommended", | |
| "parserOptions": { | |
| "sourceType": "module", | |
| "ecmaFeatures": { | |
| "experimentalObjectRestSpread": true | |
| } | |
| }, | |
| "rules": { | |
| "no-console": 0, | |
| "indent": [ | |
| "error", | |
| 2 | |
| ], | |
| "linebreak-style": [ | |
| "error", | |
| "unix" | |
| ], | |
| "quotes": [ | |
| "error", | |
| "single" | |
| ], | |
| "semi": [ | |
| "error", | |
| "never" | |
| ] | |
| }, | |
| "globals": { | |
| "d3": true, | |
| "topojson": true, | |
| "_": true, | |
| "turf": true, | |
| "_points": true, | |
| "_addresses": true, | |
| "_world": true | |
| } | |
| } |
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| .DS_Store | |
| temp |
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| // https://d3js.org/d3-geo-projection/ Version 2.1.2. Copyright 2017 Mike Bostock. | |
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a=Or(r),c=Ir(r),f=Ir(n),l=i(e*a+t*c*f),g=Or(l),v=qr(g)>Jr?l/g:1;return[v*t*Or(n),(qr(n)>Zr?v:-v)*(e*c-t*a*f)]}var e=Or(n),t=Ir(n),o=gn(n);return o.invert=gn(-n),r.invert=function(n,r){var t=u(n*n+r*r),i=-Or(t),a=Ir(t),c=t*a,f=-r*i,l=t*e,g=u(c*c+f*f-l*l),v=Hr(c*l+f*g,f*l-c*g),s=(t>Zr?-1:1)*Hr(n*i,t*Ir(v)*a+r*Or(v)*i);return o.invert(s,v)},r}function gn(n){var r=Or(n),e=Ir(n);return function(n,t){var i=Ir(t),u=Ir(n)*i,a=Or(n)*i,c=Or(t);return[Hr(a,u*e-c*r),o(c*e+u*r)]}}function vn(n){function r(r,l){var g,v=qr(l);if(v>e){var s=Vr(n-1,Qr(0,Tr((r+Yr)/a)));r+=Yr*(n-1)/n-s*a,g=C(r,v),g[0]=g[0]*te/t-te*(n-1)/(2*n)+s*te/n,g[1]=o+4*(g[1]-i)*u/te,l<0&&(g[1]=-g[1])}else g=ut(r,l);return g[0]*=c,g[1]/=f,g}var e=it*ie,t=C(Yr,e)[0]-C(-Yr,e)[0],o=ut(0,e)[1],i=C(0,e)[1],u=ee-i,a=te/n,c=4/te,f=o+u*u*4/te;return r.invert=function(r,e){r/=c,e*=f;var l=qr(e);if(l>o){var g=Vr(n-1,Qr(0,Tr((r+Yr)/a)));r=(r+Yr*(n-1)/n-g*a)*t/te;var v=C.invert(r,.25*(l-o)*te/u+i);return 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r=1/(n[0]*n[4]-n[1]*n[3]);return[r*n[4],-r*n[1],r*(n[1]*n[5]-n[2]*n[4]),-r*n[3],r*n[0],r*(n[2]*n[3]-n[0]*n[5])]}function Vn(n,r){return[n[0]*r[0]+n[1]*r[3],n[0]*r[1]+n[1]*r[4],n[0]*r[2]+n[1]*r[5]+n[2],n[3]*r[0]+n[4]*r[3],n[3]*r[1]+n[4]*r[4],n[3]*r[2]+n[4]*r[5]+n[5]]}function Nn(n,r){return[n[0]-r[0],n[1]-r[1]]}function _n(n){return u(n[0]*n[0]+n[1]*n[1])}function Kn(n,r){return Hr(n[0]*r[1]-n[1]*r[0],n[0]*r[0]+n[1]*r[1])}function On(n,e,t){var o,i,u=e.edges,a=u.length,c={type:"MultiPoint",coordinates:e.face},f=e.face.filter(function(n){return 90!==qr(n[1])}),l=r.geoBounds({type:"MultiPoint",coordinates:f}),g=!1,v=-1,s=l[1][0]-l[0][0],p=180===s||360===s?[(l[0][0]+l[1][0])/2,(l[0][1]+l[1][1])/2]:r.geoCentroid(c);if(t)for(;++v<a&&u[v]!==t;);++v;for(var h=0;h<a;++h)i=u[(h+v)%a],Array.isArray(i)?(g||(n.point((o=r.geoInterpolate(i[0],p)(Jr))[0],o[1]),g=!0),n.point((o=r.geoInterpolate(i[1],p)(Jr))[0],o[1])):(g=!1,i!==t&&On(n,i,e))}function Un(n,r){return 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| *{box-sizing:border-box}svg{display:block;margin:0 auto;stroke-linejoin:round;stroke-linecap:round}svg path.sphere{fill:none;stroke:#444}svg path.graticule{fill:none;stroke:#eee}svg path.land{fill:#ddd;stroke:#999;stroke-width:.5px}svg path.line{fill:none;stroke:#8f092a;stroke-width:1px} |
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| !function(g){function n(I){if(t[I])return t[I].exports;var C=t[I]={i:I,l:!1,exports:{}};return g[I].call(C.exports,C,C.exports,n),C.l=!0,C.exports}var t={};n.m=g,n.c=t,n.i=function(g){return g},n.d=function(g,t,I){n.o(g,t)||Object.defineProperty(g,t,{configurable:!1,enumerable:!0,get:I})},n.n=function(g){var t=g&&g.__esModule?function(){return g.default}:function(){return g};return n.d(t,"a",t),t},n.o=function(g,n){return Object.prototype.hasOwnProperty.call(g,n)},n.p="",n(n.s=0)}([function(module,exports,__webpack_require__){"use strict";eval("\n\nvar margin = { top: 10, right: 10, bottom: 10, left: 10 };\nvar outerWidth = 960;\n\nd3.json('./ne_10m_land.json', function (world) {\n\n var generateVerticalLines = function generateVerticalLines(_ref) {\n var step = _ref.step,\n goDown = _ref.goDown;\n return d3.range(-180, 180, step).map(function (lon) {\n return d3.range(0, 90, 2 * step).map(function (lat) {\n return {\n type: 'LineString',\n coordinates: [[lon, lat * (goDown ? -1 : 1)], [lon, (lat + step) * (goDown ? -1 : 1)]] };\n });\n });\n };\n\n var lines = generateVerticalLines({ step: 10 }).concat(generateVerticalLines({ step: 10, goDown: true })\n\n // Convert world topojson to geojson.\n );var feature = topojson.feature(world, world.objects.countries\n\n // Get feature's projection.\n );var projection = d3.geoMollweide().precision(0.1\n\n // Get the path.\n );var path = d3.geoPath().projection(projection\n\n // Get the path's bounds in pixels.\n );var b = path.bounds(feature\n\n // Get aspect ratio.\n );var aspect = (b[1][0] - b[0][0]) / (b[1][1] - b[0][1]);\n\n // Calculate the outer height by using outer width and aspect ratio.\n var outerHeight = outerWidth / aspect;\n\n // Calculate width and height.\n var width = outerWidth - margin.left - margin.right;\n var height = outerHeight - margin.top - margin.bottom;\n\n // Fit the feature to the container's width.\n projection.fitSize([width, height], feature\n\n // Get svg.\n );var g = d3.select('svg').attr('width', outerWidth).attr('height', outerHeight).append('g').attr('transform', 'translate(' + margin.left + ', ' + margin.top + ')'\n\n // Draw graticule.\n );g.append('path').datum(d3.geoGraticule()).attr('class', 'graticule').attr('d', path\n\n // Draw land.\n );g.append('path').datum(feature).attr('class', 'land').attr('d', path\n\n // Create the line groups.\n );var lineGs = g.selectAll('g.linegroup').data(lines).enter().append('g').attr('class', function (d, i) {\n return 'linegroup-' + i;\n }\n\n // Draw lines.\n );lineGs.selectAll('path').data(function (d) {\n return d;\n }).enter().append('path').attr('class', 'line').attr('d', path).attr('stroke-dasharray', function () {\n var l = this.getTotalLength();\n return l + ', ' + l;\n }).attr('stroke-dashoffset', function () {\n return this.getTotalLength();\n });\n\n lineGs.transition().on('start', function repeat(d, i, a, context) {\n\n var self = context || this;\n\n // Get this g element,\n var selection = d3.select(self\n // select all its paths,\n ).selectAll('path'\n // only include the hidden ones,\n ).filter(function () {\n return d3.select(this).attr('stroke-dashoffset') > 0;\n }\n // and only include the first one.\n ).filter(function (d, i) {\n return i === 0;\n }\n\n // If this selection contains exactly one element,\n );if (selection.size() === 1) {\n\n var l = selection.node().getTotalLength\n\n // transition the stroke-dashoffset,\n ();selection.transition().duration(l * 10).ease(d3.easeLinear).attr('stroke-dashoffset', 0\n // and on end, call this whole thing again.\n ).on('end', function () {\n repeat(null, null, null, self);\n });\n }\n }\n\n // Draw sphere outline.\n );g.append('path').datum({ type: 'Sphere' }).attr('class', 'sphere').attr('d', path);\n});//# sourceMappingURL=data:application/json;charset=utf-8;base64,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|
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| <!DOCTYPE html> | |
| <title>Chained stroke interpolation</title> | |
| <link href='dist.css' rel='stylesheet' /> | |
| <body> | |
| <svg></svg> | |
| <script src='d3.v4.min.js'></script> | |
| <script src='d3-geo-projection.v2.min.js'></script> | |
| <script src='topojson.min.js'></script> | |
| <script src='dist.js'></script> | |
| </body> |
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| clean: | |
| rm -rf temp | |
| mkdir temp | |
| download: | |
| cd temp; curl -L 'http://www.naturalearthdata.com/http//www.naturalearthdata.com/download/10m/physical/ne_10m_land.zip' > ne_10m_land.zip | |
| cd temp; unzip ne_10m_land.zip | |
| process: | |
| bash -c "geo2topo -q 1e5 countries=<(shp2json temp/ne_10m_land.shp | geostitch) \ | |
| | toposimplify -p 0.125 \ | |
| > ne_10m_land.json" |
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| const margin = { top: 10, right: 10, bottom: 10, left: 10 } | |
| const outerWidth = 960 | |
| d3.json('./ne_10m_land.json', world => { | |
| const generateVerticalLines = ({ step, goDown }) => | |
| d3.range(-180, 180, step) | |
| .map(lon => | |
| d3.range(0, 90, 2 * step) | |
| .map(lat => ({ | |
| type: 'LineString', | |
| coordinates: [ | |
| [lon, lat * (goDown ? -1 : 1)], | |
| [lon, (lat + step) * (goDown ? -1 : 1)], | |
| ]}))) | |
| const lines = generateVerticalLines({ step: 10 }) | |
| .concat(generateVerticalLines({ step: 10, goDown: true })) | |
| // Convert world topojson to geojson. | |
| const feature = topojson.feature(world, world.objects.countries) | |
| // Get feature's projection. | |
| const projection = d3 | |
| .geoMollweide() | |
| .precision(0.1) | |
| // Get the path. | |
| const path = d3.geoPath().projection(projection) | |
| // Get the path's bounds in pixels. | |
| const b = path.bounds(feature) | |
| // Get aspect ratio. | |
| const aspect = (b[1][0] - b[0][0]) / (b[1][1] - b[0][1]) | |
| // Calculate the outer height by using outer width and aspect ratio. | |
| const outerHeight = outerWidth / aspect | |
| // Calculate width and height. | |
| const width = outerWidth - margin.left - margin.right | |
| const height = outerHeight - margin.top - margin.bottom | |
| // Fit the feature to the container's width. | |
| projection.fitSize([width, height], feature) | |
| // Get svg. | |
| const g = d3.select('svg') | |
| .attr('width', outerWidth) | |
| .attr('height', outerHeight) | |
| .append('g') | |
| .attr('transform', `translate(${margin.left}, ${margin.top})`) | |
| // Draw graticule. | |
| g.append('path') | |
| .datum(d3.geoGraticule()) | |
| .attr('class', 'graticule') | |
| .attr('d', path) | |
| // Draw land. | |
| g.append('path') | |
| .datum(feature) | |
| .attr('class', 'land') | |
| .attr('d', path) | |
| // Create the line groups. | |
| const lineGs = g.selectAll('g.linegroup') | |
| .data(lines) | |
| .enter().append('g') | |
| .attr('class', (d, i) => `linegroup-${i}`) | |
| // Draw lines. | |
| lineGs.selectAll('path') | |
| .data(d => d) | |
| .enter().append('path') | |
| .attr('class', 'line') | |
| .attr('d', path) | |
| .attr('stroke-dasharray', function() { | |
| const l = this.getTotalLength() | |
| return `${l}, ${l}` | |
| }) | |
| .attr('stroke-dashoffset', function() { | |
| return this.getTotalLength() | |
| }) | |
| lineGs | |
| .transition() | |
| .on('start', function repeat(d, i, a, context) { | |
| const self = context || this | |
| // Get this g element, | |
| const selection = d3.select(self) | |
| // select all its paths, | |
| .selectAll('path') | |
| // only include the hidden ones, | |
| .filter(function() { | |
| return d3.select(this).attr('stroke-dashoffset') > 0 | |
| }) | |
| // and only include the first one. | |
| .filter((d, i) => i === 0) | |
| // If this selection contains exactly one element, | |
| if (selection.size() === 1) { | |
| const l = selection.node().getTotalLength() | |
| // transition the stroke-dashoffset, | |
| selection.transition() | |
| .duration(l * 10) | |
| .ease(d3.easeLinear) | |
| .attr('stroke-dashoffset', 0) | |
| // and on end, call this whole thing again. | |
| .on('end', () => { | |
| repeat(null, null, null, self) | |
| }) | |
| } | |
| }) | |
| // Draw sphere outline. | |
| g.append('path') | |
| .datum({ type: 'Sphere' }) | |
| .attr('class', 'sphere') | |
| .attr('d', path) | |
| }) |
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| $red = #8f092a | |
| $green = #736e4d | |
| * | |
| box-sizing border-box | |
| svg | |
| display block | |
| margin 0 auto | |
| stroke-linejoin round | |
| stroke-linecap round | |
| path | |
| &.sphere | |
| fill none | |
| stroke #444 | |
| &.graticule | |
| fill none | |
| stroke #eee | |
| &.land | |
| fill #ddd | |
| stroke #999 | |
| stroke-width 0.5px | |
| &.line | |
| fill none | |
| stroke $red | |
| stroke-width 1px |
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| // https://github.com/topojson/topojson Version 3.0.0. Copyright 2017 Mike Bostock. | |
| (function (global, factory) { | |
| typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports) : | |
| typeof define === 'function' && define.amd ? define(['exports'], factory) : | |
| (factory((global.topojson = global.topojson || {}))); | |
| }(this, (function (exports) { 'use strict'; | |
| var identity = function(x) { | |
| return x; | |
| }; | |
| var transform = function(transform) { | |
| if (transform == null) return identity; | |
| var x0, | |
| y0, | |
| kx = transform.scale[0], | |
| ky = transform.scale[1], | |
| dx = transform.translate[0], | |
| dy = transform.translate[1]; | |
| return function(input, i) { | |
| if (!i) x0 = y0 = 0; | |
| var j = 2, n = input.length, output = new Array(n); | |
| output[0] = (x0 += input[0]) * kx + dx; | |
| output[1] = (y0 += input[1]) * ky + dy; | |
| while (j < n) output[j] = input[j], ++j; | |
| return output; | |
| }; | |
| }; | |
| var bbox = function(topology) { | |
| var t = transform(topology.transform), key, | |
| x0 = Infinity, y0 = x0, x1 = -x0, y1 = -x0; | |
| function bboxPoint(p) { | |
| p = t(p); | |
| if (p[0] < x0) x0 = p[0]; | |
| if (p[0] > x1) x1 = p[0]; | |
| if (p[1] < y0) y0 = p[1]; | |
| if (p[1] > y1) y1 = p[1]; | |
| } | |
| function bboxGeometry(o) { | |
| switch (o.type) { | |
| case "GeometryCollection": o.geometries.forEach(bboxGeometry); break; | |
| case "Point": bboxPoint(o.coordinates); break; | |
| case "MultiPoint": o.coordinates.forEach(bboxPoint); break; | |
| } | |
| } | |
| topology.arcs.forEach(function(arc) { | |
| var i = -1, n = arc.length, p; | |
| while (++i < n) { | |
| p = t(arc[i], i); | |
| if (p[0] < x0) x0 = p[0]; | |
| if (p[0] > x1) x1 = p[0]; | |
| if (p[1] < y0) y0 = p[1]; | |
| if (p[1] > y1) y1 = p[1]; | |
| } | |
| }); | |
| for (key in topology.objects) { | |
| bboxGeometry(topology.objects[key]); | |
| } | |
| return [x0, y0, x1, y1]; | |
| }; | |
| var reverse = function(array, n) { | |
| var t, j = array.length, i = j - n; | |
| while (i < --j) t = array[i], array[i++] = array[j], array[j] = t; | |
| }; | |
| var feature = function(topology, o) { | |
| return o.type === "GeometryCollection" | |
| ? {type: "FeatureCollection", features: o.geometries.map(function(o) { return feature$1(topology, o); })} | |
| : feature$1(topology, o); | |
| }; | |
| function feature$1(topology, o) { | |
| var id = o.id, | |
| bbox = o.bbox, | |
| properties = o.properties == null ? {} : o.properties, | |
| geometry = object(topology, o); | |
| return id == null && bbox == null ? {type: "Feature", properties: properties, geometry: geometry} | |
| : bbox == null ? {type: "Feature", id: id, properties: properties, geometry: geometry} | |
| : {type: "Feature", id: id, bbox: bbox, properties: properties, geometry: geometry}; | |
| } | |
| function object(topology, o) { | |
| var transformPoint = transform(topology.transform), | |
| arcs = topology.arcs; | |
| function arc(i, points) { | |
| if (points.length) points.pop(); | |
| for (var a = arcs[i < 0 ? ~i : i], k = 0, n = a.length; k < n; ++k) { | |
| points.push(transformPoint(a[k], k)); | |
| } | |
| if (i < 0) reverse(points, n); | |
| } | |
| function point(p) { | |
| return transformPoint(p); | |
| } | |
| function line(arcs) { | |
| var points = []; | |
| for (var i = 0, n = arcs.length; i < n; ++i) arc(arcs[i], points); | |
| if (points.length < 2) points.push(points[0]); // This should never happen per the specification. | |
| return points; | |
| } | |
| function ring(arcs) { | |
| var points = line(arcs); | |
| while (points.length < 4) points.push(points[0]); // This may happen if an arc has only two points. | |
| return points; | |
| } | |
| function polygon(arcs) { | |
| return arcs.map(ring); | |
| } | |
| function geometry(o) { | |
| var type = o.type, coordinates; | |
| switch (type) { | |
| case "GeometryCollection": return {type: type, geometries: o.geometries.map(geometry)}; | |
| case "Point": coordinates = point(o.coordinates); break; | |
| case "MultiPoint": coordinates = o.coordinates.map(point); break; | |
| case "LineString": coordinates = line(o.arcs); break; | |
| case "MultiLineString": coordinates = o.arcs.map(line); break; | |
| case "Polygon": coordinates = polygon(o.arcs); break; | |
| case "MultiPolygon": coordinates = o.arcs.map(polygon); break; | |
| default: return null; | |
| } | |
| return {type: type, coordinates: coordinates}; | |
| } | |
| return geometry(o); | |
| } | |
| var stitch = function(topology, arcs) { | |
| var stitchedArcs = {}, | |
| fragmentByStart = {}, | |
| fragmentByEnd = {}, | |
| fragments = [], | |
| emptyIndex = -1; | |
| // Stitch empty arcs first, since they may be subsumed by other arcs. | |
| arcs.forEach(function(i, j) { | |
| var arc = topology.arcs[i < 0 ? ~i : i], t; | |
| if (arc.length < 3 && !arc[1][0] && !arc[1][1]) { | |
| t = arcs[++emptyIndex], arcs[emptyIndex] = i, arcs[j] = t; | |
| } | |
| }); | |
| arcs.forEach(function(i) { | |
| var e = ends(i), | |
| start = e[0], | |
| end = e[1], | |
| f, g; | |
| if (f = fragmentByEnd[start]) { | |
| delete fragmentByEnd[f.end]; | |
| f.push(i); | |
| f.end = end; | |
| if (g = fragmentByStart[end]) { | |
| delete fragmentByStart[g.start]; | |
| var fg = g === f ? f : f.concat(g); | |
| fragmentByStart[fg.start = f.start] = fragmentByEnd[fg.end = g.end] = fg; | |
| } else { | |
| fragmentByStart[f.start] = fragmentByEnd[f.end] = f; | |
| } | |
| } else if (f = fragmentByStart[end]) { | |
| delete fragmentByStart[f.start]; | |
| f.unshift(i); | |
| f.start = start; | |
| if (g = fragmentByEnd[start]) { | |
| delete fragmentByEnd[g.end]; | |
| var gf = g === f ? f : g.concat(f); | |
| fragmentByStart[gf.start = g.start] = fragmentByEnd[gf.end = f.end] = gf; | |
| } else { | |
| fragmentByStart[f.start] = fragmentByEnd[f.end] = f; | |
| } | |
| } else { | |
| f = [i]; | |
| fragmentByStart[f.start = start] = fragmentByEnd[f.end = end] = f; | |
| } | |
| }); | |
| function ends(i) { | |
| var arc = topology.arcs[i < 0 ? ~i : i], p0 = arc[0], p1; | |
| if (topology.transform) p1 = [0, 0], arc.forEach(function(dp) { p1[0] += dp[0], p1[1] += dp[1]; }); | |
| else p1 = arc[arc.length - 1]; | |
| return i < 0 ? [p1, p0] : [p0, p1]; | |
| } | |
| function flush(fragmentByEnd, fragmentByStart) { | |
| for (var k in fragmentByEnd) { | |
| var f = fragmentByEnd[k]; | |
| delete fragmentByStart[f.start]; | |
| delete f.start; | |
| delete f.end; | |
| f.forEach(function(i) { stitchedArcs[i < 0 ? ~i : i] = 1; }); | |
| fragments.push(f); | |
| } | |
| } | |
| flush(fragmentByEnd, fragmentByStart); | |
| flush(fragmentByStart, fragmentByEnd); | |
| arcs.forEach(function(i) { if (!stitchedArcs[i < 0 ? ~i : i]) fragments.push([i]); }); | |
| return fragments; | |
| }; | |
| var mesh = function(topology) { | |
| return object(topology, meshArcs.apply(this, arguments)); | |
| }; | |
| function meshArcs(topology, object$$1, filter) { | |
| var arcs, i, n; | |
| if (arguments.length > 1) arcs = extractArcs(topology, object$$1, filter); | |
| else for (i = 0, arcs = new Array(n = topology.arcs.length); i < n; ++i) arcs[i] = i; | |
| return {type: "MultiLineString", arcs: stitch(topology, arcs)}; | |
| } | |
| function extractArcs(topology, object$$1, filter) { | |
| var arcs = [], | |
| geomsByArc = [], | |
| geom; | |
| function extract0(i) { | |
| var j = i < 0 ? ~i : i; | |
| (geomsByArc[j] || (geomsByArc[j] = [])).push({i: i, g: geom}); | |
| } | |
| function extract1(arcs) { | |
| arcs.forEach(extract0); | |
| } | |
| function extract2(arcs) { | |
| arcs.forEach(extract1); | |
| } | |
| function extract3(arcs) { | |
| arcs.forEach(extract2); | |
| } | |
| function geometry(o) { | |
| switch (geom = o, o.type) { | |
| case "GeometryCollection": o.geometries.forEach(geometry); break; | |
| case "LineString": extract1(o.arcs); break; | |
| case "MultiLineString": case "Polygon": extract2(o.arcs); break; | |
| case "MultiPolygon": extract3(o.arcs); break; | |
| } | |
| } | |
| geometry(object$$1); | |
| geomsByArc.forEach(filter == null | |
| ? function(geoms) { arcs.push(geoms[0].i); } | |
| : function(geoms) { if (filter(geoms[0].g, geoms[geoms.length - 1].g)) arcs.push(geoms[0].i); }); | |
| return arcs; | |
| } | |
| function planarRingArea(ring) { | |
| var i = -1, n = ring.length, a, b = ring[n - 1], area = 0; | |
| while (++i < n) a = b, b = ring[i], area += a[0] * b[1] - a[1] * b[0]; | |
| return Math.abs(area); // Note: doubled area! | |
| } | |
| var merge = function(topology) { | |
| return object(topology, mergeArcs.apply(this, arguments)); | |
| }; | |
| function mergeArcs(topology, objects) { | |
| var polygonsByArc = {}, | |
| polygons = [], | |
| groups = []; | |
| objects.forEach(geometry); | |
| function geometry(o) { | |
| switch (o.type) { | |
| case "GeometryCollection": o.geometries.forEach(geometry); break; | |
| case "Polygon": extract(o.arcs); break; | |
| case "MultiPolygon": o.arcs.forEach(extract); break; | |
| } | |
| } | |
| function extract(polygon) { | |
| polygon.forEach(function(ring) { | |
| ring.forEach(function(arc) { | |
| (polygonsByArc[arc = arc < 0 ? ~arc : arc] || (polygonsByArc[arc] = [])).push(polygon); | |
| }); | |
| }); | |
| polygons.push(polygon); | |
| } | |
| function area(ring) { | |
| return planarRingArea(object(topology, {type: "Polygon", arcs: [ring]}).coordinates[0]); | |
| } | |
| polygons.forEach(function(polygon) { | |
| if (!polygon._) { | |
| var group = [], | |
| neighbors = [polygon]; | |
| polygon._ = 1; | |
| groups.push(group); | |
| while (polygon = neighbors.pop()) { | |
| group.push(polygon); | |
| polygon.forEach(function(ring) { | |
| ring.forEach(function(arc) { | |
| polygonsByArc[arc < 0 ? ~arc : arc].forEach(function(polygon) { | |
| if (!polygon._) { | |
| polygon._ = 1; | |
| neighbors.push(polygon); | |
| } | |
| }); | |
| }); | |
| }); | |
| } | |
| } | |
| }); | |
| polygons.forEach(function(polygon) { | |
| delete polygon._; | |
| }); | |
| return { | |
| type: "MultiPolygon", | |
| arcs: groups.map(function(polygons) { | |
| var arcs = [], n; | |
| // Extract the exterior (unique) arcs. | |
| polygons.forEach(function(polygon) { | |
| polygon.forEach(function(ring) { | |
| ring.forEach(function(arc) { | |
| if (polygonsByArc[arc < 0 ? ~arc : arc].length < 2) { | |
| arcs.push(arc); | |
| } | |
| }); | |
| }); | |
| }); | |
| // Stitch the arcs into one or more rings. | |
| arcs = stitch(topology, arcs); | |
| // If more than one ring is returned, | |
| // at most one of these rings can be the exterior; | |
| // choose the one with the greatest absolute area. | |
| if ((n = arcs.length) > 1) { | |
| for (var i = 1, k = area(arcs[0]), ki, t; i < n; ++i) { | |
| if ((ki = area(arcs[i])) > k) { | |
| t = arcs[0], arcs[0] = arcs[i], arcs[i] = t, k = ki; | |
| } | |
| } | |
| } | |
| return arcs; | |
| }) | |
| }; | |
| } | |
| var bisect = function(a, x) { | |
| var lo = 0, hi = a.length; | |
| while (lo < hi) { | |
| var mid = lo + hi >>> 1; | |
| if (a[mid] < x) lo = mid + 1; | |
| else hi = mid; | |
| } | |
| return lo; | |
| }; | |
| var neighbors = function(objects) { | |
| var indexesByArc = {}, // arc index -> array of object indexes | |
| neighbors = objects.map(function() { return []; }); | |
| function line(arcs, i) { | |
| arcs.forEach(function(a) { | |
| if (a < 0) a = ~a; | |
| var o = indexesByArc[a]; | |
| if (o) o.push(i); | |
| else indexesByArc[a] = [i]; | |
| }); | |
| } | |
| function polygon(arcs, i) { | |
| arcs.forEach(function(arc) { line(arc, i); }); | |
| } | |
| function geometry(o, i) { | |
| if (o.type === "GeometryCollection") o.geometries.forEach(function(o) { geometry(o, i); }); | |
| else if (o.type in geometryType) geometryType[o.type](o.arcs, i); | |
| } | |
| var geometryType = { | |
| LineString: line, | |
| MultiLineString: polygon, | |
| Polygon: polygon, | |
| MultiPolygon: function(arcs, i) { arcs.forEach(function(arc) { polygon(arc, i); }); } | |
| }; | |
| objects.forEach(geometry); | |
| for (var i in indexesByArc) { | |
| for (var indexes = indexesByArc[i], m = indexes.length, j = 0; j < m; ++j) { | |
| for (var k = j + 1; k < m; ++k) { | |
| var ij = indexes[j], ik = indexes[k], n; | |
| if ((n = neighbors[ij])[i = bisect(n, ik)] !== ik) n.splice(i, 0, ik); | |
| if ((n = neighbors[ik])[i = bisect(n, ij)] !== ij) n.splice(i, 0, ij); | |
| } | |
| } | |
| } | |
| return neighbors; | |
| }; | |
| var untransform = function(transform) { | |
| if (transform == null) return identity; | |
| var x0, | |
| y0, | |
| kx = transform.scale[0], | |
| ky = transform.scale[1], | |
| dx = transform.translate[0], | |
| dy = transform.translate[1]; | |
| return function(input, i) { | |
| if (!i) x0 = y0 = 0; | |
| var j = 2, | |
| n = input.length, | |
| output = new Array(n), | |
| x1 = Math.round((input[0] - dx) / kx), | |
| y1 = Math.round((input[1] - dy) / ky); | |
| output[0] = x1 - x0, x0 = x1; | |
| output[1] = y1 - y0, y0 = y1; | |
| while (j < n) output[j] = input[j], ++j; | |
| return output; | |
| }; | |
| }; | |
| var quantize = function(topology, transform) { | |
| if (topology.transform) throw new Error("already quantized"); | |
| if (!transform || !transform.scale) { | |
| if (!((n = Math.floor(transform)) >= 2)) throw new Error("n must be \u22652"); | |
| box = topology.bbox || bbox(topology); | |
| var x0 = box[0], y0 = box[1], x1 = box[2], y1 = box[3], n; | |
| transform = {scale: [x1 - x0 ? (x1 - x0) / (n - 1) : 1, y1 - y0 ? (y1 - y0) / (n - 1) : 1], translate: [x0, y0]}; | |
| } else { | |
| box = topology.bbox; | |
| } | |
| var t = untransform(transform), box, key, inputs = topology.objects, outputs = {}; | |
| function quantizePoint(point) { | |
| return t(point); | |
| } | |
| function quantizeGeometry(input) { | |
| var output; | |
| switch (input.type) { | |
| case "GeometryCollection": output = {type: "GeometryCollection", geometries: input.geometries.map(quantizeGeometry)}; break; | |
| case "Point": output = {type: "Point", coordinates: quantizePoint(input.coordinates)}; break; | |
| case "MultiPoint": output = {type: "MultiPoint", coordinates: input.coordinates.map(quantizePoint)}; break; | |
| default: return input; | |
| } | |
| if (input.id != null) output.id = input.id; | |
| if (input.bbox != null) output.bbox = input.bbox; | |
| if (input.properties != null) output.properties = input.properties; | |
| return output; | |
| } | |
| function quantizeArc(input) { | |
| var i = 0, j = 1, n = input.length, p, output = new Array(n); // pessimistic | |
| output[0] = t(input[0], 0); | |
| while (++i < n) if ((p = t(input[i], i))[0] || p[1]) output[j++] = p; // non-coincident points | |
| if (j === 1) output[j++] = [0, 0]; // an arc must have at least two points | |
| output.length = j; | |
| return output; | |
| } | |
| for (key in inputs) outputs[key] = quantizeGeometry(inputs[key]); | |
| return { | |
| type: "Topology", | |
| bbox: box, | |
| transform: transform, | |
| objects: outputs, | |
| arcs: topology.arcs.map(quantizeArc) | |
| }; | |
| }; | |
| // Computes the bounding box of the specified hash of GeoJSON objects. | |
| var bounds = function(objects) { | |
| var x0 = Infinity, | |
| y0 = Infinity, | |
| x1 = -Infinity, | |
| y1 = -Infinity; | |
| function boundGeometry(geometry) { | |
| if (geometry != null && boundGeometryType.hasOwnProperty(geometry.type)) boundGeometryType[geometry.type](geometry); | |
| } | |
| var boundGeometryType = { | |
| GeometryCollection: function(o) { o.geometries.forEach(boundGeometry); }, | |
| Point: function(o) { boundPoint(o.coordinates); }, | |
| MultiPoint: function(o) { o.coordinates.forEach(boundPoint); }, | |
| LineString: function(o) { boundLine(o.arcs); }, | |
| MultiLineString: function(o) { o.arcs.forEach(boundLine); }, | |
| Polygon: function(o) { o.arcs.forEach(boundLine); }, | |
| MultiPolygon: function(o) { o.arcs.forEach(boundMultiLine); } | |
| }; | |
| function boundPoint(coordinates) { | |
| var x = coordinates[0], | |
| y = coordinates[1]; | |
| if (x < x0) x0 = x; | |
| if (x > x1) x1 = x; | |
| if (y < y0) y0 = y; | |
| if (y > y1) y1 = y; | |
| } | |
| function boundLine(coordinates) { | |
| coordinates.forEach(boundPoint); | |
| } | |
| function boundMultiLine(coordinates) { | |
| coordinates.forEach(boundLine); | |
| } | |
| for (var key in objects) { | |
| boundGeometry(objects[key]); | |
| } | |
| return x1 >= x0 && y1 >= y0 ? [x0, y0, x1, y1] : undefined; | |
| }; | |
| var hashset = function(size, hash, equal, type, empty) { | |
| if (arguments.length === 3) { | |
| type = Array; | |
| empty = null; | |
| } | |
| var store = new type(size = 1 << Math.max(4, Math.ceil(Math.log(size) / Math.LN2))), | |
| mask = size - 1; | |
| for (var i = 0; i < size; ++i) { | |
| store[i] = empty; | |
| } | |
| function add(value) { | |
| var index = hash(value) & mask, | |
| match = store[index], | |
| collisions = 0; | |
| while (match != empty) { | |
| if (equal(match, value)) return true; | |
| if (++collisions >= size) throw new Error("full hashset"); | |
| match = store[index = (index + 1) & mask]; | |
| } | |
| store[index] = value; | |
| return true; | |
| } | |
| function has(value) { | |
| var index = hash(value) & mask, | |
| match = store[index], | |
| collisions = 0; | |
| while (match != empty) { | |
| if (equal(match, value)) return true; | |
| if (++collisions >= size) break; | |
| match = store[index = (index + 1) & mask]; | |
| } | |
| return false; | |
| } | |
| function values() { | |
| var values = []; | |
| for (var i = 0, n = store.length; i < n; ++i) { | |
| var match = store[i]; | |
| if (match != empty) values.push(match); | |
| } | |
| return values; | |
| } | |
| return { | |
| add: add, | |
| has: has, | |
| values: values | |
| }; | |
| }; | |
| var hashmap = function(size, hash, equal, keyType, keyEmpty, valueType) { | |
| if (arguments.length === 3) { | |
| keyType = valueType = Array; | |
| keyEmpty = null; | |
| } | |
| var keystore = new keyType(size = 1 << Math.max(4, Math.ceil(Math.log(size) / Math.LN2))), | |
| valstore = new valueType(size), | |
| mask = size - 1; | |
| for (var i = 0; i < size; ++i) { | |
| keystore[i] = keyEmpty; | |
| } | |
| function set(key, value) { | |
| var index = hash(key) & mask, | |
| matchKey = keystore[index], | |
| collisions = 0; | |
| while (matchKey != keyEmpty) { | |
| if (equal(matchKey, key)) return valstore[index] = value; | |
| if (++collisions >= size) throw new Error("full hashmap"); | |
| matchKey = keystore[index = (index + 1) & mask]; | |
| } | |
| keystore[index] = key; | |
| valstore[index] = value; | |
| return value; | |
| } | |
| function maybeSet(key, value) { | |
| var index = hash(key) & mask, | |
| matchKey = keystore[index], | |
| collisions = 0; | |
| while (matchKey != keyEmpty) { | |
| if (equal(matchKey, key)) return valstore[index]; | |
| if (++collisions >= size) throw new Error("full hashmap"); | |
| matchKey = keystore[index = (index + 1) & mask]; | |
| } | |
| keystore[index] = key; | |
| valstore[index] = value; | |
| return value; | |
| } | |
| function get(key, missingValue) { | |
| var index = hash(key) & mask, | |
| matchKey = keystore[index], | |
| collisions = 0; | |
| while (matchKey != keyEmpty) { | |
| if (equal(matchKey, key)) return valstore[index]; | |
| if (++collisions >= size) break; | |
| matchKey = keystore[index = (index + 1) & mask]; | |
| } | |
| return missingValue; | |
| } | |
| function keys() { | |
| var keys = []; | |
| for (var i = 0, n = keystore.length; i < n; ++i) { | |
| var matchKey = keystore[i]; | |
| if (matchKey != keyEmpty) keys.push(matchKey); | |
| } | |
| return keys; | |
| } | |
| return { | |
| set: set, | |
| maybeSet: maybeSet, // set if unset | |
| get: get, | |
| keys: keys | |
| }; | |
| }; | |
| var equalPoint = function(pointA, pointB) { | |
| return pointA[0] === pointB[0] && pointA[1] === pointB[1]; | |
| }; | |
| // TODO if quantized, use simpler Int32 hashing? | |
| var buffer = new ArrayBuffer(16); | |
| var floats = new Float64Array(buffer); | |
| var uints = new Uint32Array(buffer); | |
| var hashPoint = function(point) { | |
| floats[0] = point[0]; | |
| floats[1] = point[1]; | |
| var hash = uints[0] ^ uints[1]; | |
| hash = hash << 5 ^ hash >> 7 ^ uints[2] ^ uints[3]; | |
| return hash & 0x7fffffff; | |
| }; | |
| // Given an extracted (pre-)topology, identifies all of the junctions. These are | |
| // the points at which arcs (lines or rings) will need to be cut so that each | |
| // arc is represented uniquely. | |
| // | |
| // A junction is a point where at least one arc deviates from another arc going | |
| // through the same point. For example, consider the point B. If there is a arc | |
| // through ABC and another arc through CBA, then B is not a junction because in | |
| // both cases the adjacent point pairs are {A,C}. However, if there is an | |
| // additional arc ABD, then {A,D} != {A,C}, and thus B becomes a junction. | |
| // | |
| // For a closed ring ABCA, the first point A’s adjacent points are the second | |
| // and last point {B,C}. For a line, the first and last point are always | |
| // considered junctions, even if the line is closed; this ensures that a closed | |
| // line is never rotated. | |
| var join = function(topology) { | |
| var coordinates = topology.coordinates, | |
| lines = topology.lines, | |
| rings = topology.rings, | |
| indexes = index(), | |
| visitedByIndex = new Int32Array(coordinates.length), | |
| leftByIndex = new Int32Array(coordinates.length), | |
| rightByIndex = new Int32Array(coordinates.length), | |
| junctionByIndex = new Int8Array(coordinates.length), | |
| junctionCount = 0, // upper bound on number of junctions | |
| i, n, | |
| previousIndex, | |
| currentIndex, | |
| nextIndex; | |
| for (i = 0, n = coordinates.length; i < n; ++i) { | |
| visitedByIndex[i] = leftByIndex[i] = rightByIndex[i] = -1; | |
| } | |
| for (i = 0, n = lines.length; i < n; ++i) { | |
| var line = lines[i], | |
| lineStart = line[0], | |
| lineEnd = line[1]; | |
| currentIndex = indexes[lineStart]; | |
| nextIndex = indexes[++lineStart]; | |
| ++junctionCount, junctionByIndex[currentIndex] = 1; // start | |
| while (++lineStart <= lineEnd) { | |
| sequence(i, previousIndex = currentIndex, currentIndex = nextIndex, nextIndex = indexes[lineStart]); | |
| } | |
| ++junctionCount, junctionByIndex[nextIndex] = 1; // end | |
| } | |
| for (i = 0, n = coordinates.length; i < n; ++i) { | |
| visitedByIndex[i] = -1; | |
| } | |
| for (i = 0, n = rings.length; i < n; ++i) { | |
| var ring = rings[i], | |
| ringStart = ring[0] + 1, | |
| ringEnd = ring[1]; | |
| previousIndex = indexes[ringEnd - 1]; | |
| currentIndex = indexes[ringStart - 1]; | |
| nextIndex = indexes[ringStart]; | |
| sequence(i, previousIndex, currentIndex, nextIndex); | |
| while (++ringStart <= ringEnd) { | |
| sequence(i, previousIndex = currentIndex, currentIndex = nextIndex, nextIndex = indexes[ringStart]); | |
| } | |
| } | |
| function sequence(i, previousIndex, currentIndex, nextIndex) { | |
| if (visitedByIndex[currentIndex] === i) return; // ignore self-intersection | |
| visitedByIndex[currentIndex] = i; | |
| var leftIndex = leftByIndex[currentIndex]; | |
| if (leftIndex >= 0) { | |
| var rightIndex = rightByIndex[currentIndex]; | |
| if ((leftIndex !== previousIndex || rightIndex !== nextIndex) | |
| && (leftIndex !== nextIndex || rightIndex !== previousIndex)) { | |
| ++junctionCount, junctionByIndex[currentIndex] = 1; | |
| } | |
| } else { | |
| leftByIndex[currentIndex] = previousIndex; | |
| rightByIndex[currentIndex] = nextIndex; | |
| } | |
| } | |
| function index() { | |
| var indexByPoint = hashmap(coordinates.length * 1.4, hashIndex, equalIndex, Int32Array, -1, Int32Array), | |
| indexes = new Int32Array(coordinates.length); | |
| for (var i = 0, n = coordinates.length; i < n; ++i) { | |
| indexes[i] = indexByPoint.maybeSet(i, i); | |
| } | |
| return indexes; | |
| } | |
| function hashIndex(i) { | |
| return hashPoint(coordinates[i]); | |
| } | |
| function equalIndex(i, j) { | |
| return equalPoint(coordinates[i], coordinates[j]); | |
| } | |
| visitedByIndex = leftByIndex = rightByIndex = null; | |
| var junctionByPoint = hashset(junctionCount * 1.4, hashPoint, equalPoint), j; | |
| // Convert back to a standard hashset by point for caller convenience. | |
| for (i = 0, n = coordinates.length; i < n; ++i) { | |
| if (junctionByIndex[j = indexes[i]]) { | |
| junctionByPoint.add(coordinates[j]); | |
| } | |
| } | |
| return junctionByPoint; | |
| }; | |
| // Given an extracted (pre-)topology, cuts (or rotates) arcs so that all shared | |
| // point sequences are identified. The topology can then be subsequently deduped | |
| // to remove exact duplicate arcs. | |
| var cut = function(topology) { | |
| var junctions = join(topology), | |
| coordinates = topology.coordinates, | |
| lines = topology.lines, | |
| rings = topology.rings, | |
| next, | |
| i, n; | |
| for (i = 0, n = lines.length; i < n; ++i) { | |
| var line = lines[i], | |
| lineMid = line[0], | |
| lineEnd = line[1]; | |
| while (++lineMid < lineEnd) { | |
| if (junctions.has(coordinates[lineMid])) { | |
| next = {0: lineMid, 1: line[1]}; | |
| line[1] = lineMid; | |
| line = line.next = next; | |
| } | |
| } | |
| } | |
| for (i = 0, n = rings.length; i < n; ++i) { | |
| var ring = rings[i], | |
| ringStart = ring[0], | |
| ringMid = ringStart, | |
| ringEnd = ring[1], | |
| ringFixed = junctions.has(coordinates[ringStart]); | |
| while (++ringMid < ringEnd) { | |
| if (junctions.has(coordinates[ringMid])) { | |
| if (ringFixed) { | |
| next = {0: ringMid, 1: ring[1]}; | |
| ring[1] = ringMid; | |
| ring = ring.next = next; | |
| } else { // For the first junction, we can rotate rather than cut. | |
| rotateArray(coordinates, ringStart, ringEnd, ringEnd - ringMid); | |
| coordinates[ringEnd] = coordinates[ringStart]; | |
| ringFixed = true; | |
| ringMid = ringStart; // restart; we may have skipped junctions | |
| } | |
| } | |
| } | |
| } | |
| return topology; | |
| }; | |
| function rotateArray(array, start, end, offset) { | |
| reverse$1(array, start, end); | |
| reverse$1(array, start, start + offset); | |
| reverse$1(array, start + offset, end); | |
| } | |
| function reverse$1(array, start, end) { | |
| for (var mid = start + ((end-- - start) >> 1), t; start < mid; ++start, --end) { | |
| t = array[start], array[start] = array[end], array[end] = t; | |
| } | |
| } | |
| // Given a cut topology, combines duplicate arcs. | |
| var dedup = function(topology) { | |
| var coordinates = topology.coordinates, | |
| lines = topology.lines, line, | |
| rings = topology.rings, ring, | |
| arcCount = lines.length + rings.length, | |
| i, n; | |
| delete topology.lines; | |
| delete topology.rings; | |
| // Count the number of (non-unique) arcs to initialize the hashmap safely. | |
| for (i = 0, n = lines.length; i < n; ++i) { | |
| line = lines[i]; while (line = line.next) ++arcCount; | |
| } | |
| for (i = 0, n = rings.length; i < n; ++i) { | |
| ring = rings[i]; while (ring = ring.next) ++arcCount; | |
| } | |
| var arcsByEnd = hashmap(arcCount * 2 * 1.4, hashPoint, equalPoint), | |
| arcs = topology.arcs = []; | |
| for (i = 0, n = lines.length; i < n; ++i) { | |
| line = lines[i]; | |
| do { | |
| dedupLine(line); | |
| } while (line = line.next); | |
| } | |
| for (i = 0, n = rings.length; i < n; ++i) { | |
| ring = rings[i]; | |
| if (ring.next) { // arc is no longer closed | |
| do { | |
| dedupLine(ring); | |
| } while (ring = ring.next); | |
| } else { | |
| dedupRing(ring); | |
| } | |
| } | |
| function dedupLine(arc) { | |
| var startPoint, | |
| endPoint, | |
| startArcs, startArc, | |
| endArcs, endArc, | |
| i, n; | |
| // Does this arc match an existing arc in order? | |
| if (startArcs = arcsByEnd.get(startPoint = coordinates[arc[0]])) { | |
| for (i = 0, n = startArcs.length; i < n; ++i) { | |
| startArc = startArcs[i]; | |
| if (equalLine(startArc, arc)) { | |
| arc[0] = startArc[0]; | |
| arc[1] = startArc[1]; | |
| return; | |
| } | |
| } | |
| } | |
| // Does this arc match an existing arc in reverse order? | |
| if (endArcs = arcsByEnd.get(endPoint = coordinates[arc[1]])) { | |
| for (i = 0, n = endArcs.length; i < n; ++i) { | |
| endArc = endArcs[i]; | |
| if (reverseEqualLine(endArc, arc)) { | |
| arc[1] = endArc[0]; | |
| arc[0] = endArc[1]; | |
| return; | |
| } | |
| } | |
| } | |
| if (startArcs) startArcs.push(arc); else arcsByEnd.set(startPoint, [arc]); | |
| if (endArcs) endArcs.push(arc); else arcsByEnd.set(endPoint, [arc]); | |
| arcs.push(arc); | |
| } | |
| function dedupRing(arc) { | |
| var endPoint, | |
| endArcs, | |
| endArc, | |
| i, n; | |
| // Does this arc match an existing line in order, or reverse order? | |
| // Rings are closed, so their start point and end point is the same. | |
| if (endArcs = arcsByEnd.get(endPoint = coordinates[arc[0]])) { | |
| for (i = 0, n = endArcs.length; i < n; ++i) { | |
| endArc = endArcs[i]; | |
| if (equalRing(endArc, arc)) { | |
| arc[0] = endArc[0]; | |
| arc[1] = endArc[1]; | |
| return; | |
| } | |
| if (reverseEqualRing(endArc, arc)) { | |
| arc[0] = endArc[1]; | |
| arc[1] = endArc[0]; | |
| return; | |
| } | |
| } | |
| } | |
| // Otherwise, does this arc match an existing ring in order, or reverse order? | |
| if (endArcs = arcsByEnd.get(endPoint = coordinates[arc[0] + findMinimumOffset(arc)])) { | |
| for (i = 0, n = endArcs.length; i < n; ++i) { | |
| endArc = endArcs[i]; | |
| if (equalRing(endArc, arc)) { | |
| arc[0] = endArc[0]; | |
| arc[1] = endArc[1]; | |
| return; | |
| } | |
| if (reverseEqualRing(endArc, arc)) { | |
| arc[0] = endArc[1]; | |
| arc[1] = endArc[0]; | |
| return; | |
| } | |
| } | |
| } | |
| if (endArcs) endArcs.push(arc); else arcsByEnd.set(endPoint, [arc]); | |
| arcs.push(arc); | |
| } | |
| function equalLine(arcA, arcB) { | |
| var ia = arcA[0], ib = arcB[0], | |
| ja = arcA[1], jb = arcB[1]; | |
| if (ia - ja !== ib - jb) return false; | |
| for (; ia <= ja; ++ia, ++ib) if (!equalPoint(coordinates[ia], coordinates[ib])) return false; | |
| return true; | |
| } | |
| function reverseEqualLine(arcA, arcB) { | |
| var ia = arcA[0], ib = arcB[0], | |
| ja = arcA[1], jb = arcB[1]; | |
| if (ia - ja !== ib - jb) return false; | |
| for (; ia <= ja; ++ia, --jb) if (!equalPoint(coordinates[ia], coordinates[jb])) return false; | |
| return true; | |
| } | |
| function equalRing(arcA, arcB) { | |
| var ia = arcA[0], ib = arcB[0], | |
| ja = arcA[1], jb = arcB[1], | |
| n = ja - ia; | |
| if (n !== jb - ib) return false; | |
| var ka = findMinimumOffset(arcA), | |
| kb = findMinimumOffset(arcB); | |
| for (var i = 0; i < n; ++i) { | |
| if (!equalPoint(coordinates[ia + (i + ka) % n], coordinates[ib + (i + kb) % n])) return false; | |
| } | |
| return true; | |
| } | |
| function reverseEqualRing(arcA, arcB) { | |
| var ia = arcA[0], ib = arcB[0], | |
| ja = arcA[1], jb = arcB[1], | |
| n = ja - ia; | |
| if (n !== jb - ib) return false; | |
| var ka = findMinimumOffset(arcA), | |
| kb = n - findMinimumOffset(arcB); | |
| for (var i = 0; i < n; ++i) { | |
| if (!equalPoint(coordinates[ia + (i + ka) % n], coordinates[jb - (i + kb) % n])) return false; | |
| } | |
| return true; | |
| } | |
| // Rings are rotated to a consistent, but arbitrary, start point. | |
| // This is necessary to detect when a ring and a rotated copy are dupes. | |
| function findMinimumOffset(arc) { | |
| var start = arc[0], | |
| end = arc[1], | |
| mid = start, | |
| minimum = mid, | |
| minimumPoint = coordinates[mid]; | |
| while (++mid < end) { | |
| var point = coordinates[mid]; | |
| if (point[0] < minimumPoint[0] || point[0] === minimumPoint[0] && point[1] < minimumPoint[1]) { | |
| minimum = mid; | |
| minimumPoint = point; | |
| } | |
| } | |
| return minimum - start; | |
| } | |
| return topology; | |
| }; | |
| // Given an array of arcs in absolute (but already quantized!) coordinates, | |
| // converts to fixed-point delta encoding. | |
| // This is a destructive operation that modifies the given arcs! | |
| var delta = function(arcs) { | |
| var i = -1, | |
| n = arcs.length; | |
| while (++i < n) { | |
| var arc = arcs[i], | |
| j = 0, | |
| k = 1, | |
| m = arc.length, | |
| point = arc[0], | |
| x0 = point[0], | |
| y0 = point[1], | |
| x1, | |
| y1; | |
| while (++j < m) { | |
| point = arc[j], x1 = point[0], y1 = point[1]; | |
| if (x1 !== x0 || y1 !== y0) arc[k++] = [x1 - x0, y1 - y0], x0 = x1, y0 = y1; | |
| } | |
| if (k === 1) arc[k++] = [0, 0]; // Each arc must be an array of two or more positions. | |
| arc.length = k; | |
| } | |
| return arcs; | |
| }; | |
| // Extracts the lines and rings from the specified hash of geometry objects. | |
| // | |
| // Returns an object with three properties: | |
| // | |
| // * coordinates - shared buffer of [x, y] coordinates | |
| // * lines - lines extracted from the hash, of the form [start, end] | |
| // * rings - rings extracted from the hash, of the form [start, end] | |
| // | |
| // For each ring or line, start and end represent inclusive indexes into the | |
| // coordinates buffer. For rings (and closed lines), coordinates[start] equals | |
| // coordinates[end]. | |
| // | |
| // For each line or polygon geometry in the input hash, including nested | |
| // geometries as in geometry collections, the `coordinates` array is replaced | |
| // with an equivalent `arcs` array that, for each line (for line string | |
| // geometries) or ring (for polygon geometries), points to one of the above | |
| // lines or rings. | |
| var extract = function(objects) { | |
| var index = -1, | |
| lines = [], | |
| rings = [], | |
| coordinates = []; | |
| function extractGeometry(geometry) { | |
| if (geometry && extractGeometryType.hasOwnProperty(geometry.type)) extractGeometryType[geometry.type](geometry); | |
| } | |
| var extractGeometryType = { | |
| GeometryCollection: function(o) { o.geometries.forEach(extractGeometry); }, | |
| LineString: function(o) { o.arcs = extractLine(o.arcs); }, | |
| MultiLineString: function(o) { o.arcs = o.arcs.map(extractLine); }, | |
| Polygon: function(o) { o.arcs = o.arcs.map(extractRing); }, | |
| MultiPolygon: function(o) { o.arcs = o.arcs.map(extractMultiRing); } | |
| }; | |
| function extractLine(line) { | |
| for (var i = 0, n = line.length; i < n; ++i) coordinates[++index] = line[i]; | |
| var arc = {0: index - n + 1, 1: index}; | |
| lines.push(arc); | |
| return arc; | |
| } | |
| function extractRing(ring) { | |
| for (var i = 0, n = ring.length; i < n; ++i) coordinates[++index] = ring[i]; | |
| var arc = {0: index - n + 1, 1: index}; | |
| rings.push(arc); | |
| return arc; | |
| } | |
| function extractMultiRing(rings) { | |
| return rings.map(extractRing); | |
| } | |
| for (var key in objects) { | |
| extractGeometry(objects[key]); | |
| } | |
| return { | |
| type: "Topology", | |
| coordinates: coordinates, | |
| lines: lines, | |
| rings: rings, | |
| objects: objects | |
| }; | |
| }; | |
| // Given a hash of GeoJSON objects, returns a hash of GeoJSON geometry objects. | |
| // Any null input geometry objects are represented as {type: null} in the output. | |
| // Any feature.{id,properties,bbox} are transferred to the output geometry object. | |
| // Each output geometry object is a shallow copy of the input (e.g., properties, coordinates)! | |
| var geometry = function(inputs) { | |
| var outputs = {}, key; | |
| for (key in inputs) outputs[key] = geomifyObject(inputs[key]); | |
| return outputs; | |
| }; | |
| function geomifyObject(input) { | |
| return input == null ? {type: null} | |
| : (input.type === "FeatureCollection" ? geomifyFeatureCollection | |
| : input.type === "Feature" ? geomifyFeature | |
| : geomifyGeometry)(input); | |
| } | |
| function geomifyFeatureCollection(input) { | |
| var output = {type: "GeometryCollection", geometries: input.features.map(geomifyFeature)}; | |
| if (input.bbox != null) output.bbox = input.bbox; | |
| return output; | |
| } | |
| function geomifyFeature(input) { | |
| var output = geomifyGeometry(input.geometry), key; // eslint-disable-line no-unused-vars | |
| if (input.id != null) output.id = input.id; | |
| if (input.bbox != null) output.bbox = input.bbox; | |
| for (key in input.properties) { output.properties = input.properties; break; } | |
| return output; | |
| } | |
| function geomifyGeometry(input) { | |
| if (input == null) return {type: null}; | |
| var output = input.type === "GeometryCollection" ? {type: "GeometryCollection", geometries: input.geometries.map(geomifyGeometry)} | |
| : input.type === "Point" || input.type === "MultiPoint" ? {type: input.type, coordinates: input.coordinates} | |
| : {type: input.type, arcs: input.coordinates}; // TODO Check for unknown types? | |
| if (input.bbox != null) output.bbox = input.bbox; | |
| return output; | |
| } | |
| var prequantize = function(objects, bbox, n) { | |
| var x0 = bbox[0], | |
| y0 = bbox[1], | |
| x1 = bbox[2], | |
| y1 = bbox[3], | |
| kx = x1 - x0 ? (n - 1) / (x1 - x0) : 1, | |
| ky = y1 - y0 ? (n - 1) / (y1 - y0) : 1; | |
| function quantizePoint(input) { | |
| return [Math.round((input[0] - x0) * kx), Math.round((input[1] - y0) * ky)]; | |
| } | |
| function quantizePoints(input, m) { | |
| var i = -1, | |
| j = 0, | |
| n = input.length, | |
| output = new Array(n), // pessimistic | |
| pi, | |
| px, | |
| py, | |
| x, | |
| y; | |
| while (++i < n) { | |
| pi = input[i]; | |
| x = Math.round((pi[0] - x0) * kx); | |
| y = Math.round((pi[1] - y0) * ky); | |
| if (x !== px || y !== py) output[j++] = [px = x, py = y]; // non-coincident points | |
| } | |
| output.length = j; | |
| while (j < m) j = output.push([output[0][0], output[0][1]]); | |
| return output; | |
| } | |
| function quantizeLine(input) { | |
| return quantizePoints(input, 2); | |
| } | |
| function quantizeRing(input) { | |
| return quantizePoints(input, 4); | |
| } | |
| function quantizePolygon(input) { | |
| return input.map(quantizeRing); | |
| } | |
| function quantizeGeometry(o) { | |
| if (o != null && quantizeGeometryType.hasOwnProperty(o.type)) quantizeGeometryType[o.type](o); | |
| } | |
| var quantizeGeometryType = { | |
| GeometryCollection: function(o) { o.geometries.forEach(quantizeGeometry); }, | |
| Point: function(o) { o.coordinates = quantizePoint(o.coordinates); }, | |
| MultiPoint: function(o) { o.coordinates = o.coordinates.map(quantizePoint); }, | |
| LineString: function(o) { o.arcs = quantizeLine(o.arcs); }, | |
| MultiLineString: function(o) { o.arcs = o.arcs.map(quantizeLine); }, | |
| Polygon: function(o) { o.arcs = quantizePolygon(o.arcs); }, | |
| MultiPolygon: function(o) { o.arcs = o.arcs.map(quantizePolygon); } | |
| }; | |
| for (var key in objects) { | |
| quantizeGeometry(objects[key]); | |
| } | |
| return { | |
| scale: [1 / kx, 1 / ky], | |
| translate: [x0, y0] | |
| }; | |
| }; | |
| // Constructs the TopoJSON Topology for the specified hash of features. | |
| // Each object in the specified hash must be a GeoJSON object, | |
| // meaning FeatureCollection, a Feature or a geometry object. | |
| var topology = function(objects, quantization) { | |
| var bbox = bounds(objects = geometry(objects)), | |
| transform = quantization > 0 && bbox && prequantize(objects, bbox, quantization), | |
| topology = dedup(cut(extract(objects))), | |
| coordinates = topology.coordinates, | |
| indexByArc = hashmap(topology.arcs.length * 1.4, hashArc, equalArc); | |
| objects = topology.objects; // for garbage collection | |
| topology.bbox = bbox; | |
| topology.arcs = topology.arcs.map(function(arc, i) { | |
| indexByArc.set(arc, i); | |
| return coordinates.slice(arc[0], arc[1] + 1); | |
| }); | |
| delete topology.coordinates; | |
| coordinates = null; | |
| function indexGeometry(geometry$$1) { | |
| if (geometry$$1 && indexGeometryType.hasOwnProperty(geometry$$1.type)) indexGeometryType[geometry$$1.type](geometry$$1); | |
| } | |
| var indexGeometryType = { | |
| GeometryCollection: function(o) { o.geometries.forEach(indexGeometry); }, | |
| LineString: function(o) { o.arcs = indexArcs(o.arcs); }, | |
| MultiLineString: function(o) { o.arcs = o.arcs.map(indexArcs); }, | |
| Polygon: function(o) { o.arcs = o.arcs.map(indexArcs); }, | |
| MultiPolygon: function(o) { o.arcs = o.arcs.map(indexMultiArcs); } | |
| }; | |
| function indexArcs(arc) { | |
| var indexes = []; | |
| do { | |
| var index = indexByArc.get(arc); | |
| indexes.push(arc[0] < arc[1] ? index : ~index); | |
| } while (arc = arc.next); | |
| return indexes; | |
| } | |
| function indexMultiArcs(arcs) { | |
| return arcs.map(indexArcs); | |
| } | |
| for (var key in objects) { | |
| indexGeometry(objects[key]); | |
| } | |
| if (transform) { | |
| topology.transform = transform; | |
| topology.arcs = delta(topology.arcs); | |
| } | |
| return topology; | |
| }; | |
| function hashArc(arc) { | |
| var i = arc[0], j = arc[1], t; | |
| if (j < i) t = i, i = j, j = t; | |
| return i + 31 * j; | |
| } | |
| function equalArc(arcA, arcB) { | |
| var ia = arcA[0], ja = arcA[1], | |
| ib = arcB[0], jb = arcB[1], t; | |
| if (ja < ia) t = ia, ia = ja, ja = t; | |
| if (jb < ib) t = ib, ib = jb, jb = t; | |
| return ia === ib && ja === jb; | |
| } | |
| var prune = function(topology) { | |
| var oldObjects = topology.objects, | |
| newObjects = {}, | |
| oldArcs = topology.arcs, | |
| newArcs = [], | |
| newArcIndex = -1, | |
| newIndexByOldIndex = new Array(oldArcs.length), | |
| key; | |
| function pruneGeometry(input) { | |
| var output; | |
| switch (input.type) { | |
| case "GeometryCollection": output = {type: "GeometryCollection", geometries: input.geometries.map(pruneGeometry)}; break; | |
| case "LineString": output = {type: "LineString", arcs: pruneArcs(input.arcs)}; break; | |
| case "MultiLineString": output = {type: "MultiLineString", arcs: input.arcs.map(pruneArcs)}; break; | |
| case "Polygon": output = {type: "Polygon", arcs: input.arcs.map(pruneArcs)}; break; | |
| case "MultiPolygon": output = {type: "MultiPolygon", arcs: input.arcs.map(pruneMultiArcs)}; break; | |
| default: return input; | |
| } | |
| if (input.id != null) output.id = input.id; | |
| if (input.bbox != null) output.bbox = input.bbox; | |
| if (input.properties != null) output.properties = input.properties; | |
| return output; | |
| } | |
| function pruneArc(oldIndex) { | |
| var oldReverse = oldIndex < 0 && (oldIndex = ~oldIndex, true), newIndex; | |
| // If this is the first instance of this arc, record it under its new index. | |
| if ((newIndex = newIndexByOldIndex[oldIndex]) == null) { | |
| newIndexByOldIndex[oldIndex] = newIndex = ++newArcIndex; | |
| newArcs[newIndex] = oldArcs[oldIndex]; | |
| } | |
| return oldReverse ? ~newIndex : newIndex; | |
| } | |
| function pruneArcs(arcs) { | |
| return arcs.map(pruneArc); | |
| } | |
| function pruneMultiArcs(arcs) { | |
| return arcs.map(pruneArcs); | |
| } | |
| for (key in oldObjects) { | |
| newObjects[key] = pruneGeometry(oldObjects[key]); | |
| } | |
| return { | |
| type: "Topology", | |
| bbox: topology.bbox, | |
| transform: topology.transform, | |
| objects: newObjects, | |
| arcs: newArcs | |
| }; | |
| }; | |
| var filter = function(topology, filter) { | |
| var oldObjects = topology.objects, | |
| newObjects = {}, | |
| key; | |
| if (filter == null) filter = filterTrue; | |
| function filterGeometry(input) { | |
| var output, arcs; | |
| switch (input.type) { | |
| case "Polygon": { | |
| arcs = filterRings(input.arcs); | |
| output = arcs ? {type: "Polygon", arcs: arcs} : {type: null}; | |
| break; | |
| } | |
| case "MultiPolygon": { | |
| arcs = input.arcs.map(filterRings).filter(filterIdentity); | |
| output = arcs.length ? {type: "MultiPolygon", arcs: arcs} : {type: null}; | |
| break; | |
| } | |
| case "GeometryCollection": { | |
| arcs = input.geometries.map(filterGeometry).filter(filterNotNull); | |
| output = arcs.length ? {type: "GeometryCollection", geometries: arcs} : {type: null}; | |
| break; | |
| } | |
| default: return input; | |
| } | |
| if (input.id != null) output.id = input.id; | |
| if (input.bbox != null) output.bbox = input.bbox; | |
| if (input.properties != null) output.properties = input.properties; | |
| return output; | |
| } | |
| function filterRings(arcs) { | |
| return arcs.length && filterExteriorRing(arcs[0]) // if the exterior is small, ignore any holes | |
| ? [arcs[0]].concat(arcs.slice(1).filter(filterInteriorRing)) | |
| : null; | |
| } | |
| function filterExteriorRing(ring) { | |
| return filter(ring, false); | |
| } | |
| function filterInteriorRing(ring) { | |
| return filter(ring, true); | |
| } | |
| for (key in oldObjects) { | |
| newObjects[key] = filterGeometry(oldObjects[key]); | |
| } | |
| return prune({ | |
| type: "Topology", | |
| bbox: topology.bbox, | |
| transform: topology.transform, | |
| objects: newObjects, | |
| arcs: topology.arcs | |
| }); | |
| }; | |
| function filterTrue() { | |
| return true; | |
| } | |
| function filterIdentity(x) { | |
| return x; | |
| } | |
| function filterNotNull(geometry) { | |
| return geometry.type != null; | |
| } | |
| var filterAttached = function(topology) { | |
| var uniqueRingByArc = {}, // arc index -> index of unique associated ring, or -1 if used by multiple rings | |
| ringIndex = 0, | |
| name; | |
| function testGeometry(o) { | |
| switch (o.type) { | |
| case "GeometryCollection": o.geometries.forEach(testGeometry); break; | |
| case "Polygon": testArcs(o.arcs); break; | |
| case "MultiPolygon": o.arcs.forEach(testArcs); break; | |
| } | |
| } | |
| function testArcs(arcs) { | |
| for (var i = 0, n = arcs.length; i < n; ++i, ++ringIndex) { | |
| for (var ring = arcs[i], j = 0, m = ring.length; j < m; ++j) { | |
| var arc = ring[j]; | |
| if (arc < 0) arc = ~arc; | |
| var uniqueRing = uniqueRingByArc[arc]; | |
| if (uniqueRing >= 0 && uniqueRing !== ringIndex) uniqueRingByArc[arc] = -1; | |
| else uniqueRingByArc[arc] = ringIndex; | |
| } | |
| } | |
| } | |
| for (name in topology.objects) { | |
| testGeometry(topology.objects[name]); | |
| } | |
| return function(ring) { | |
| for (var j = 0, m = ring.length, arc; j < m; ++j) { | |
| if (arc = ring[j], uniqueRingByArc[arc < 0 ? ~arc : arc] < 0) { | |
| return true; | |
| } | |
| } | |
| return false; | |
| }; | |
| }; | |
| function planarTriangleArea(triangle) { | |
| var a = triangle[0], b = triangle[1], c = triangle[2]; | |
| return Math.abs((a[0] - c[0]) * (b[1] - a[1]) - (a[0] - b[0]) * (c[1] - a[1])) / 2; | |
| } | |
| function planarRingArea$1(ring) { | |
| var i = -1, n = ring.length, a, b = ring[n - 1], area = 0; | |
| while (++i < n) a = b, b = ring[i], area += a[0] * b[1] - a[1] * b[0]; | |
| return Math.abs(area) / 2; | |
| } | |
| var filterWeight = function(topology, minWeight, weight) { | |
| minWeight = minWeight == null ? Number.MIN_VALUE : +minWeight; | |
| if (weight == null) weight = planarRingArea$1; | |
| return function(ring, interior) { | |
| return weight(feature(topology, {type: "Polygon", arcs: [ring]}).geometry.coordinates[0], interior) >= minWeight; | |
| }; | |
| }; | |
| var filterAttachedWeight = function(topology, minWeight, weight) { | |
| var a = filterAttached(topology), | |
| w = filterWeight(topology, minWeight, weight); | |
| return function(ring, interior) { | |
| return a(ring, interior) || w(ring, interior); | |
| }; | |
| }; | |
| function compare(a, b) { | |
| return a[1][2] - b[1][2]; | |
| } | |
| var newHeap = function() { | |
| var heap = {}, | |
| array = [], | |
| size = 0; | |
| heap.push = function(object) { | |
| up(array[object._ = size] = object, size++); | |
| return size; | |
| }; | |
| heap.pop = function() { | |
| if (size <= 0) return; | |
| var removed = array[0], object; | |
| if (--size > 0) object = array[size], down(array[object._ = 0] = object, 0); | |
| return removed; | |
| }; | |
| heap.remove = function(removed) { | |
| var i = removed._, object; | |
| if (array[i] !== removed) return; // invalid request | |
| if (i !== --size) object = array[size], (compare(object, removed) < 0 ? up : down)(array[object._ = i] = object, i); | |
| return i; | |
| }; | |
| function up(object, i) { | |
| while (i > 0) { | |
| var j = ((i + 1) >> 1) - 1, | |
| parent = array[j]; | |
| if (compare(object, parent) >= 0) break; | |
| array[parent._ = i] = parent; | |
| array[object._ = i = j] = object; | |
| } | |
| } | |
| function down(object, i) { | |
| while (true) { | |
| var r = (i + 1) << 1, | |
| l = r - 1, | |
| j = i, | |
| child = array[j]; | |
| if (l < size && compare(array[l], child) < 0) child = array[j = l]; | |
| if (r < size && compare(array[r], child) < 0) child = array[j = r]; | |
| if (j === i) break; | |
| array[child._ = i] = child; | |
| array[object._ = i = j] = object; | |
| } | |
| } | |
| return heap; | |
| }; | |
| function copy(point) { | |
| return [point[0], point[1], 0]; | |
| } | |
| var presimplify = function(topology, weight) { | |
| var point = topology.transform ? transform(topology.transform) : copy, | |
| heap = newHeap(); | |
| if (weight == null) weight = planarTriangleArea; | |
| var arcs = topology.arcs.map(function(arc) { | |
| var triangles = [], | |
| maxWeight = 0, | |
| triangle, | |
| i, | |
| n; | |
| arc = arc.map(point); | |
| for (i = 1, n = arc.length - 1; i < n; ++i) { | |
| triangle = [arc[i - 1], arc[i], arc[i + 1]]; | |
| triangle[1][2] = weight(triangle); | |
| triangles.push(triangle); | |
| heap.push(triangle); | |
| } | |
| // Always keep the arc endpoints! | |
| arc[0][2] = arc[n][2] = Infinity; | |
| for (i = 0, n = triangles.length; i < n; ++i) { | |
| triangle = triangles[i]; | |
| triangle.previous = triangles[i - 1]; | |
| triangle.next = triangles[i + 1]; | |
| } | |
| while (triangle = heap.pop()) { | |
| var previous = triangle.previous, | |
| next = triangle.next; | |
| // If the weight of the current point is less than that of the previous | |
| // point to be eliminated, use the latter’s weight instead. This ensures | |
| // that the current point cannot be eliminated without eliminating | |
| // previously- eliminated points. | |
| if (triangle[1][2] < maxWeight) triangle[1][2] = maxWeight; | |
| else maxWeight = triangle[1][2]; | |
| if (previous) { | |
| previous.next = next; | |
| previous[2] = triangle[2]; | |
| update(previous); | |
| } | |
| if (next) { | |
| next.previous = previous; | |
| next[0] = triangle[0]; | |
| update(next); | |
| } | |
| } | |
| return arc; | |
| }); | |
| function update(triangle) { | |
| heap.remove(triangle); | |
| triangle[1][2] = weight(triangle); | |
| heap.push(triangle); | |
| } | |
| return { | |
| type: "Topology", | |
| bbox: topology.bbox, | |
| objects: topology.objects, | |
| arcs: arcs | |
| }; | |
| }; | |
| var quantile = function(topology, p) { | |
| var array = []; | |
| topology.arcs.forEach(function(arc) { | |
| arc.forEach(function(point) { | |
| if (isFinite(point[2])) { // Ignore endpoints, whose weight is Infinity. | |
| array.push(point[2]); | |
| } | |
| }); | |
| }); | |
| return array.length && quantile$1(array.sort(descending), p); | |
| }; | |
| function quantile$1(array, p) { | |
| if (!(n = array.length)) return; | |
| if ((p = +p) <= 0 || n < 2) return array[0]; | |
| if (p >= 1) return array[n - 1]; | |
| var n, | |
| h = (n - 1) * p, | |
| i = Math.floor(h), | |
| a = array[i], | |
| b = array[i + 1]; | |
| return a + (b - a) * (h - i); | |
| } | |
| function descending(a, b) { | |
| return b - a; | |
| } | |
| var simplify = function(topology, minWeight) { | |
| minWeight = minWeight == null ? Number.MIN_VALUE : +minWeight; | |
| // Remove points whose weight is less than the minimum weight. | |
| var arcs = topology.arcs.map(function(input) { | |
| var i = -1, | |
| j = 0, | |
| n = input.length, | |
| output = new Array(n), // pessimistic | |
| point; | |
| while (++i < n) { | |
| if ((point = input[i])[2] >= minWeight) { | |
| output[j++] = [point[0], point[1]]; | |
| } | |
| } | |
| output.length = j; | |
| return output; | |
| }); | |
| return { | |
| type: "Topology", | |
| transform: topology.transform, | |
| bbox: topology.bbox, | |
| objects: topology.objects, | |
| arcs: arcs | |
| }; | |
| }; | |
| var pi = Math.PI; | |
| var tau = 2 * pi; | |
| var quarterPi = pi / 4; | |
| var radians = pi / 180; | |
| var atan2 = Math.atan2; | |
| var cos = Math.cos; | |
| var sin = Math.sin; | |
| function halfArea(ring, closed) { | |
| var i = 0, | |
| n = ring.length, | |
| sum = 0, | |
| point = ring[closed ? i++ : n - 1], | |
| lambda0, lambda1 = point[0] * radians, | |
| phi1 = (point[1] * radians) / 2 + quarterPi, | |
| cosPhi0, cosPhi1 = cos(phi1), | |
| sinPhi0, sinPhi1 = sin(phi1); | |
| for (; i < n; ++i) { | |
| point = ring[i]; | |
| lambda0 = lambda1, lambda1 = point[0] * radians; | |
| phi1 = (point[1] * radians) / 2 + quarterPi; | |
| cosPhi0 = cosPhi1, cosPhi1 = cos(phi1); | |
| sinPhi0 = sinPhi1, sinPhi1 = sin(phi1); | |
| // Spherical excess E for a spherical triangle with vertices: south pole, | |
| // previous point, current point. Uses a formula derived from Cagnoli’s | |
| // theorem. See Todhunter, Spherical Trig. (1871), Sec. 103, Eq. (2). | |
| // See https://github.com/d3/d3-geo/blob/master/README.md#geoArea | |
| var dLambda = lambda1 - lambda0, | |
| sdLambda = dLambda >= 0 ? 1 : -1, | |
| adLambda = sdLambda * dLambda, | |
| k = sinPhi0 * sinPhi1, | |
| u = cosPhi0 * cosPhi1 + k * cos(adLambda), | |
| v = k * sdLambda * sin(adLambda); | |
| sum += atan2(v, u); | |
| } | |
| return sum; | |
| } | |
| function sphericalRingArea(ring, interior) { | |
| var sum = halfArea(ring, true); | |
| if (interior) sum *= -1; | |
| return (sum < 0 ? tau + sum : sum) * 2; | |
| } | |
| function sphericalTriangleArea(t) { | |
| var sum = halfArea(t, false); | |
| return (sum < 0 ? tau + sum : sum) * 2; | |
| } | |
| exports.bbox = bbox; | |
| exports.feature = feature; | |
| exports.mesh = mesh; | |
| exports.meshArcs = meshArcs; | |
| exports.merge = merge; | |
| exports.mergeArcs = mergeArcs; | |
| exports.neighbors = neighbors; | |
| exports.quantize = quantize; | |
| exports.transform = transform; | |
| exports.untransform = untransform; | |
| exports.topology = topology; | |
| exports.filter = filter; | |
| exports.filterAttached = filterAttached; | |
| exports.filterAttachedWeight = filterAttachedWeight; | |
| exports.filterWeight = filterWeight; | |
| exports.planarRingArea = planarRingArea$1; | |
| exports.planarTriangleArea = planarTriangleArea; | |
| exports.presimplify = presimplify; | |
| exports.quantile = quantile; | |
| exports.simplify = simplify; | |
| exports.sphericalRingArea = sphericalRingArea; | |
| exports.sphericalTriangleArea = sphericalTriangleArea; | |
| Object.defineProperty(exports, '__esModule', { value: true }); | |
| }))); |
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