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Edited
Apr 25, 2023
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GIS
bengalaru_parks = BubbleMap(parksInBangalore, {
// Required
features: bangalore_osm,
value: bangalore_osm_park_areas,// (d) => d.area, // ⚠️⚠️⚠️ Is it possible to make it so that value isn't "required", but instead auto-calculated as part of the implementation?
position: bangalore_osm_park_locations, // (d) => [d.lon, d.lat], // ⚠️⚠️⚠️ Is it possible to make it so that position isn't "required", but instead auto-calculated as part of the implementation?
title: (d) => d.name,
showTitle: false
})
osm_kathmandu_park_playground = FileAttachment("osm_kathmandu_park_playground.geojson").json()
parksMap = BubbleMap(parksInBangalore, {
// Required
features: bangalore_osm,
value: bangalore_osm_park_areas,// (d) => d.area, // ⚠️⚠️⚠️ Is it possible to make it so that value isn't "required", but instead auto-calculated as part of the implementation?
position: bangalore_osm_park_locations, // (d) => [d.lon, d.lat], // ⚠️⚠️⚠️ Is it possible to make it so that position isn't "required", but instead auto-calculated as part of the implementation?
title: (d) => d.name,
// Optional
borders: showWards ? bangalore_osm : null,
avoidOverlapping,
width: 960,
height: 720,
showTitle: false
})
BubbleMap(population_srilanka, {
features: map_srilanka, // tanahun, // looks like it works just the same without needing the single tanahun layer
borders: map_srilanka, // might be nice to add some convenience helpers for styling color, etc
position: (d) => {
const feat = map_srilanka.features.find(
(f) => d.name.startsWith(f.properties.tags["name:en"]) // This is specific to our dataset; the visualization will break if this property doesn't exist in your dataset.
);
return feat && centroid(feat);
},
value: (d) => +d["Population Estimate 2021-07-01"],
title: (d) =>
`${d.name.replace(" District", "")}\n${numberWithCommas(
d["Population Estimate 2021-07-01"]
)}`,
showTitle: true,
maxRadius: 25,
// avoidOverlapping: true
})
map_srilanka = FileAttachment("sri-lankan-districts.geo.json.geojson").json()
function numberWithCommas(x) {
// x = x.toString();
// var pattern = /(-?\d+)(\d{3})/;
// while (pattern.test(x)) x = x.replace(pattern, "$1,$2");
// return x;
return d3.format(",.0s")(x) // replace 's' with 'r' for comma separated numbers like 120,000
}
tanahun_municipalities = await FileAttachment("tanahun_muncipalities@1.geojson").json()
population = [
{name: "व्यास न.पा.", population: 70335},
{name: "शुक्लागण्डकी न.पा.", population: 48456},
{name: "भानु न.पा.", population: 45792},
{name: "भिमाद न.पा.", population: 31362},
{name: "आँबु खैरेनी गा.पा.", population: 20768},
{name: "ऋषिङ्ग गा.पा.", population: 25870},
{name: "म्याग्दे गा.पा.", population: 22502},
{name: "बन्दीपुर गा.पा.", population: 20013},
{name: "घिरिङ्ग गा.पा.", population: 19318},
{name: "देवघाट गा.पा.", population: 16131},
]
BubbleMap(population_srilanka, {
features: map_srilanka, // why does this break here but not in the example above? the data are identical. it seems to have something to do with the projection selector
borders: map_srilanka, //might be nice to add some convenience helpers for styling color, etc
projection: projection_selector_srilanka.rotate([Γ, Φ, Λ]),
position: (d) => {
const feat = map_srilanka.features.find(
(f) => d.name.startsWith(f.properties.tags["name:en"]) // This is specific to our dataset; the visualization will break if this property doesn't exist in your dataset.
);
return feat && centroid(feat);
},
value: (d) => d["Population Estimate 2021-07-01"],
title: (d) => `${d.name}\n${d["Population Estimate 2021-07-01"]}`,
showTitle: title_display_srilanka,
maxRadius: 25
})
map_srilanka
centroid = {
const path = d3.geoPath();
return feature => path.centroid(feature);
}
function BubbleMap(
data,
{
// Required
features, // a GeoJSON feature collection for the background
position = (d) => d, // given d in data, returns the [longitude, latitude]
value = () => undefined, // given d in data, returns the quantitative value
// Optional
width = 640,
height = 400,
margin = 10,
borders, // (Optional) a GeoJSON object for stroking borders
// It is okay to provide the same GeoJSON object used in 'features'
title, // given a datum d, returns the hover text
scale = d3.scaleSqrt, // type of radius scale
domain, // [0, max] values; input of radius scale; must start at zero
maxRadius = 40, // maximum radius of bubbles
nice = false,
ticks = 3,
showTitle,
// ⚠️ Apply rotation to the projection if needed.
// d3.geoTransverseMercator() is good for showing a country or smalles area
// d3.geoWinkel3() or d3.geoEqualEarth() is good to show larger area
projection = d3.geoIdentity().reflectY(true).fitWidth(width, features),
backgroundFill = main.grey["200"], // fill color for background
backgroundStroke = "white", // stroke color for borders
backgroundStrokeWidth, // stroke width for borders
backgroundStrokeOpacity, // stroke width for borders
backgroundStrokeLinecap = "round", // stroke line cap for borders
backgroundStrokeLinejoin = "round", // stroke line join for borders
fill = accent.blue, // fill color for bubbles
fillOpacity = 0.5, // fill opacity for bubbles
stroke = "white", // stroke color for bubbles
strokeWidth = 0.5, // stroke width for bubbles
strokeOpacity, // stroke opacity for bubbles,
titleFill = main.grey["900"],
titleFontSize = 10,
titleFontWeight = "normal",
titleStroke = "white",
titleStrokeWidth = 1.5,
titleStrokeOpacity = 0.6,
avoidOverlapping = false // ⚠️ takes time to render
}
) {
// Compute values.
// const I = d3.map(data, (_, i) => i);
const V = d3.map(data, value).map((d) => (d == null ? NaN : +d));
let P = d3.map(data, position);
const T = title == null ? null : d3.map(data, title);
features = normalizeWindingInPlace({ ...features });
borders = borders != null ? normalizeWindingInPlace({ ...borders }) : borders;
// Compute default domains.
if (domain === undefined) domain = [0, d3.max(V)];
// Construct scales.
let radius = scale(domain, [0, maxRadius]);
if (nice) {
radius = radius.copy().nice();
}
projection = projection.scale === undefined ? projection() : projection;
// Adding margin to chart
// https://github.com/d3/d3-geo/blob/main/README.md#projection_fitSize
projection.fitExtent(
[
[margin, margin],
[width - margin, height - margin]
],
features
);
const pathGenerator = d3.geoPath(projection);
if (avoidOverlapping) {
P = applySimulation(P, V, {
radius,
projection,
width: width - 2 * margin,
height: height - 2 * margin
});
}
// Draw
const svg = DOM.svg(width, height);
d3.select(svg)
.attr("style", "max-width: 100%; height: auto; height: intrinsic;")
.style("background", "white");
d3.select(svg)
.append("g")
.attr("class", "boundaries")
.selectAll(".boundary")
.data(features.features)
.join("path")
.classed("boundary", true)
.attr("d", pathGenerator)
.attr("fill", backgroundFill);
if (borders != null) {
d3.select(svg)
.append("path")
.attr("pointer-events", "none")
.attr("fill", "none")
.attr("stroke", backgroundStroke)
.attr("stroke-linecap", backgroundStrokeLinecap)
.attr("stroke-linejoin", backgroundStrokeLinejoin)
.attr("stroke-width", backgroundStrokeWidth)
.attr("stroke-opacity", backgroundStrokeOpacity)
.attr("d", pathGenerator(borders));
}
const legend = circleLegend({
scale: radius,
marginTop: 0,
marginBottom: 0,
stroke: "#666",
strokeWidth: 0.75,
tickFormat: radius.tickFormat(4, "s"),
tickFont: `10px ${fontFamily}`,
tickStrokeWidth: 0.75,
tickStroke: "#666"
});
let { dimensions: legendDimensions } = legend;
legendDimensions =
legendDimensions == null ? { width: 0, height: 0 } : legendDimensions;
d3.select(svg)
.append("g")
.attr("class", "peripherals")
.attr(
"transform",
`translate(${width - legendDimensions.width - margin},${
height - legendDimensions.height - margin
})`
)
.node()
.append(legend);
const bubbles = d3
.select(svg)
.append("g")
.selectAll(".bubbles")
.data(
d3
.range(data.length)
.filter((i) => P[i])
.sort((i, j) => d3.descending(V[i], V[j]))
)
.join("g")
// .attr("transform", (i) => `translate(${projection(P[i])})`)
.attr(
"transform",
avoidOverlapping
? (i) => `translate(${P[i].x},${P[i].y})`
: (i) => `translate(${projection(P[i])})`
)
.attr("fill", fill)
.attr("fill-opacity", fillOpacity)
.attr("stroke", stroke)
.attr("stroke-width", strokeWidth)
.attr("stroke-opacity", strokeOpacity);
bubbles
.append("circle")
.attr("r", (i) => radius(V[i]))
.call(T ? (circle) => circle.append("title").text((i) => T[i]) : () => {});
if (showTitle) {
bubbles
.append("text")
.attr("stroke-width", 0)
.attr("text-anchor", "middle")
.attr("dominant-baseline", "middle")
.attr("paint-order", "stroke")
.attr("fill", titleFill)
.attr("fill-opacity", 1)
.attr("stroke", titleStroke)
.attr("stroke-width", titleStrokeWidth)
.attr("stroke-opacity", titleStrokeOpacity)
.attr("font-size", titleFontSize)
.attr("font-weight", titleFontWeight)
.style("font-family", fontFamily)
.selectAll("tspan")
.data((i) => (T[i] == null ? [] : `${T[i]}`.split(/\n/g)))
.join("tspan")
.attr("x", 0)
.attr("y", (d, i, D) => `${i * 1.5 - D.length / 4}em`)
// .attr("font-size", (d, i, D) =>
// i === D.length - 1 ? titleFontSize * 0.75 : null
// )
.attr("fill-opacity", (d, i, D) => (i === D.length - 1 ? 0.85 : 1))
.text((d) => d);
// .call(T ? (circle) => circle.text((i) => T[i]) : () => {});
}
return svg;
}
// Based on KDO's https://observablehq.com/@karimdouieb/try-to-impeach-this-challenge-accepted
applySimulation = (
positions,
values,
{ radius, projection, width, height, maxIterations = 250, nodePadding = 0.5 }
) => {
const points = positions
.map(projection)
// Initialise to positions instead of (0,0)
.map((p) => {
const [x, y] = p;
return Object.assign(p, { x, y });
});
// prettier-ignore
const simulation = d3
.forceSimulation(points)
.force("cx", d3.forceX().x((d) => width / 2).strength(0.02))
.force("cy", d3.forceY().y((d) => height / 2).strength(0.02))
.force("x", d3.forceX().x((d) => d[0] || 0).strength(0.3))
.force("y", d3.forceY().y((d) => d[1] || 0).strength(0.3))
.force("charge", d3.forceManyBody().strength(-1))
.force("collide", d3.forceCollide().radius((d, i) => radius(values[i]) + nodePadding).strength(1))
.stop();
let i = 0;
while (simulation.alpha() > 0.01 && i < maxIterations) {
simulation.tick();
i++;
}
return simulation.nodes();
}
fontFamily = `-apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji"`
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