Public
Edited
Aug 21, 2023
4 forks
5 stars
{
const svg = d3.create("svg").attr("viewBox", [0, 0, width, height]);
const g0 = svg.append("g").attr("id", "all");
const g1 = svg.append("g").attr("id", "africa");
g0.append("path")
.attr("id", "land")
.attr("fill", "#fcfcfc")
.attr("stroke", "none")
.datum(topojson.feature(world, world.objects.land));
g0.append("path")
.attr("id", "borders-all")
.attr("fill", "none")
.attr("stroke", "#eee")
.datum(topojson.mesh(world, world.objects.countries, (a, b) => a !== b));
g0.append("path")
.attr("id", "shore-all")
.attr("fill", "none")
.attr("stroke", "lightblue")
.datum(topojson.feature(world, world.objects.land));
g1.append("g")
.attr("id", "countries-africa")
.selectAll()
.data(AfricanCountries)
.join("path")
.attr("fill", "#fefefe")
.attr("stroke", "none");
g1.append("path")
.attr("id", "borders-africa")
.attr("fill", "none")
.attr("stroke", "#ddd")
.datum(
topojson.mesh(Africa0, Africa0.objects.countries, (a, b) => a !== b)
);
g1.append("path")
.attr("id", "shore-africa")
.attr("fill", "none")
.attr("stroke", "orange")
.datum(Africa);
const path = d3.geoPath(projection);
svg.selectAll("path").attr("d", path);
return svg.node();
}
import { world110m as world } from "@visionscarto/geo"
topojson.merge(world, world.objects.countries.geometries)
AfricanCountries = topojson
.feature(world, world.objects.countries)
.features.filter((d) => {
const c = d3.geoCentroid(d);
return c[0] > -20 && c[0] < 47 && c[1] < 34.5 && c[0] + c[1] < 60;
})
Africa0 = topojson.topology({
countries: { type: "FeatureCollection", features: AfricanCountries }
})
Africa = topojson.merge(Africa0, Africa0.objects.countries.geometries)
projection = d3
.geoChamberlinAfrica()
.fitExtent(
[
[50, 50],
[width - 50, height - 50]
],
Africa
)
.clipExtent([
[-2, -2],
[width + 2, height + 2]
])
topojson = require("topojson-client@3", "topojson-server@3")
d3 = require("d3@7", "d3-geo-projection@4")
height = 900
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