chart = {
const svg = d3.create('svg')
.attr('viewBox', [0, 0, 960, 600])
.style('background-color', '#314d7a');
svg.append('path')
.datum(basemap)
.attr('d', path)
.attr('fill', '#357a31')
.attr('stroke', 'white')
.attr('stroke-width', '0.2px')
.attr('stroke-linejoin', 'round');
svg.append('path')
.datum(graticule)
.attr('d', path)
.attr('stroke', 'white')
.attr('stroke-width', '0.3px')
.attr('stroke-opacity', 0.5);
svg.append('path')
.datum(data)
.attr('d', path)
.attr('fill', 'none')
.attr('stroke', '#333333');
svg.append('g')
.selectAll('circle')
.data(data.coordinates)
.join('circle')
.attr('transform', d => `translate(${projection(d)})`)
.attr('r', 3)
.attr('fill', (d, i) => color(data.intensity[i]))
.append('title')
.text((d, i) => data.time[i] + '\n' + data.intensity[i] + ' kts');
svg.append('g')
.attr('transform', 'translate(20, 10)')
.attr('opacity', 0.8)
.append(() => legend({color,
title: 'Intensity (kts)',
tickSize: 0,
width: 180
}));
/*
Don't really need this yGraticule Label, since the parallels seem pretty self-explanatory.
const yGraticuleG = svg.append('g')
.attr('font-size', 10)
.attr('font-family', 'sans-serif')
.attr('fill', 'white')
.attr('opacity', 0.3)
.attr('text-anchor', 'end');
latitude.map(y => {
yGraticuleG.append('text')
.attr('transform', `translate(${projection([185, y]) + ""})`)
.text(formatLatitude(y))
.attr('y', -4)
})
*/
const xGraticuleG = svg.append('g')
.attr('font-size', 10)
.attr('font-family', 'sans-serif')
.attr('fill', 'white')
.attr('opacity', 0.25)
.attr('text-anchor', 'start');
longitude.map(x => {
xGraticuleG.append('text')
.attr('transform', `translate(${projection([x, -7]) + ""}) rotate(-90)`)
.text(formatLongitude(x))
.attr('y', 11)
})
return svg.node();
}
formatLongitude = x => `${Math.abs(x)}°${x < 0 ? 'W' : 'E'}`
formatLatitude = y => `${Math.abs(y)}°${y < 0 ? 'S' : 'N'}`
formatTime = d3.timeFormat('%B %d, %Y %H:%M')
color = d3.scaleThreshold()
.domain([34, 48, 64, 85, 105])
.range(['#8299d9', '#4d63a1', '#e3ce71', '#e0ae51', '#e69035', '#e05f34'])
graticule = d3.geoGraticule10()
path = d3.geoPath().projection(projection)
/* Rotate according to the longitude offset,
and center the graph based on the latitude offset. */
projection = d3.geoMercator()
.rotate([-140, 0])
.center([0, 25])
.scale([600])
basemap = d3.json('https://unpkg.com/world-atlas@1.1.4/world/50m.json').then(data => {
return topojson.feature(data, data.objects.countries)
})
data = FileAttachment('point-data.json').json().then(d => {
const rawData = d['1919'];
return {
'type': "LineString",
'coordinates': rawData.map(d2 => d2.location),
'intensity': rawData.map(d2 => d2.intensity),
'time': rawData.map(d2 => formatTime(new Date(d2.time)))
}
})
latitude = d3.range(0, 41, 10)
longitude = d3.range(100, 181, 20)
topojson = require("topojson-client@3")
import {legend} from '@d3/color-legend'
d3 = require('d3@5')
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