Manhattan Voronoi II / Fil

Fil

Vocateur.

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Published

Edited

Aug 31, 2021

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ethereal = ethereal_hexbin(radius)

function ethereal_hexbin(radius) {

const hex = d3

.hexbin()

.radius(radius)

.size([width, height]);

return hex(pts.concat(hex.centers()))

.filter(d => d.length === 1)

.map(d => [d.x, d.y]);

}

function map(anchor) {

const context = DOM.context2d(width, height),

path = d3.geoPath().context(context);

// underlying graph

context.beginPath();

for (let k = 0; k < graph.sources.length; k++) {

const i = graph.sources[k],

j = graph.targets[k];

if (i < j) {

context.moveTo(...pts[i]);

context.lineTo(...pts[j]);

}

context.strokeStyle = "#ccc";

context.lineWidth = 1;

context.stroke();

for (let i = 0; i < origins.length; i++) {

const c = d3

.tricontour()

.value((d, j) => (tree.origin[j] === origins[i] ? 1 : 0))

.contour(pts.concat(anchor.includes("use") ? ethereal : []), 0.5);

context.beginPath();

path(c);

context.globalAlpha = 0.2;

context.strokeStyle = context.fillStyle = color(origins[i]);

context.fill();

context.globalAlpha = 1;

}

if (anchor.includes("show")) {

context.beginPath();

path.pointRadius(1);

path({ type: "MultiPoint", coordinates: ethereal });

context.fillStyle = "#888";

context.fill();

}

// the trees

context.lineWidth = 2;

for (const k of origins) {

context.beginPath();

context.strokeStyle = color(k);

for (let i = 0; i < pts.length; i++) {

const j = tree.predecessor[i];

if (j > -1 && tree.origin[j] === k) {

context.moveTo(...pts[i]);

context.lineTo(...pts[j]);

}

context.stroke();

}

path.pointRadius(6);

for (const k of origins.filter(i => i < pts.length)) {

context.beginPath();

path({

type: "Point",

coordinates: pts[k]

});

context.fillStyle = color(k);

context.strokeStyle = "white";

context.fill();

context.stroke();

}

return context.canvas;

}

origins = Array.from({ length }, () => (Math.random() * nodes.length) | 0)

src = "https://gist.githubusercontent.com/Fil/450db51a15fdc8bd34a12cb8a9961976/raw/680961da57d2b11a0e3e6993e5f79bd035729831"

nodes = d3.csv(`${src}/node_list.csv`, d3.autoType)

edges = d3.csv(`${src}/edge_list.csv`, d3.autoType)

nodesIndex = new Map(nodes.map((d, i) => [d.osmid, i]))

function createGraph(nodesIndex, edges) {

const graph = { sources: [], targets: [], costs: [] };

edges.forEach(({ u, v, length }) => {

const i = nodesIndex.get(u),

j = nodesIndex.get(v),

cost = length;

graph.sources.push(i);

graph.targets.push(j);

graph.costs.push(cost);

graph.sources.push(j);

graph.targets.push(i);

graph.costs.push(cost);

});

return graph;

}

graph = createGraph(nodesIndex, edges)

import { shortest_tree } from "@fil/dijkstra"

tree = shortest_tree({ graph, origins })

pts = nodes.map(d => projection([d.x, d.y]))

projection = d3.geoMercator().fitExtent([[10, 10], [width - 10, height - 10]], {

type: "MultiPoint",

coordinates: nodes.map(d => [d.x, d.y])

})

color = d3.scaleOrdinal(d3.schemeCategory10)

d3 = require("d3@5", "d3-tricontour@1", "d3-hexbin@0.2")

import { checkbox, slider } from "@jashkenas/inputs"

height = width * 0.9

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