firstName = "Arvin"
lastName = "Huang"
handle = "arvinhv"
viewof radius = html`<input type=range min=100 max=300>`
s = 450
// Your D3 code goes here.
// The function badgeCode gets called below to generate the previews.
function badgeCode(g, c, frameNumber) {
// g: a <g>, i.e. d3.select(... the node)
// context: a canvas context, useful for doing canvas drawing
// frameNumber: a number that represents the frame (1, 2, … 10) for psuedo-animation.
// width & height are available via the environment, as is d3
// Note: the <g> is drawn on top of the <canvas>
c.fillStyle = "#34495e";
c.fillRect(0, 0, width, height);
const xPos = width/3.5 + s/2;
const yPos = height/2.5 + s/2;
var projection = d3.geoOrthographic().scale(radius).translate([xPos, yPos]);
projection.rotate([240 + frameNumber * 0.5, -30 + frameNumber * 0.5]);
var path = d3.geoPath(projection, c);
// Draw the seas.
c.lineWidth = 1.5;
c.fillStyle = "#3f3f3f";
c.strokeStyle = "#81a980";
c.beginPath(), c.arc(xPos, yPos, radius, 0, 2 * Math.PI), c.fill(), c.stroke();
// Draw the land.
c.lineWidth = 1.5;
c.strokeStyle = "#81a980";
c.beginPath();
path(world);
c.fill();
c.stroke();
// Draw the cities.
let color = d3.color('#ffba00');
color.opacity = 0.5;
c.fillStyle = color;
path.pointRadius(cityRadius(frameNumber));
cities.features.forEach(city => {
c.beginPath();
path(city);
c.fill();
});
}
isTextLight = true
result = animation
result
import {preview, animation, download, width, height, d3}
with {firstName, lastName, handle, isTextLight, badgeCode}
from "b93171820ba3f268"
topojson = require('topojson')
world = {
let world = await (await fetch("https://unpkg.com/world-atlas@1/world/110m.json")).json();
return topojson.feature(world, world.objects.countries);
}
citiesGeoUrl = 'https://gist.githubusercontent.com/ArvinH/cec17ab68a8173e29706192da30584ca/raw'
cities = {
return await (await fetch(citiesGeoUrl)).json();
}
peoplePerPixel = 50000;
cityRadius = (frameNumber) => {
const rScale = d3.scaleSqrt();
const population_array = [];
for (let i = 0; i < cities.features.length; i++) {
population_array.push(cities.features[i].properties.population);
}
const max_population = population_array.sort(d3.descending)[0]
let rMin = 0;
let rMax = Math.sqrt(max_population / (peoplePerPixel * Math.PI));
rScale.domain([0, max_population]);
rScale.range([rMin, rMax]);
return function(city) {
return city.properties ? rScale(city.properties.population) + frameNumber * 0.2 : 1;
}
}
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