Published
Edited
Feb 20, 2021
31 stars
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bg = "#eee3d7"
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yellow = '#f6b119'
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green = '#5e926e'
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red = '#e11f47'
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clicked = title =>
Object.assign(
html`<div><button onClick=${e => {
e.target.parentElement.value = true;
e.target.parentElement.dispatchEvent(new CustomEvent('input'));
}}>${title}`,
{ value: false }
)
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dotLabel = d => `$${d}`
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area = d3
.area()
.curve(d3.curveLinear)
.x(d => x(d[0]))
.y0(d => y(d[1]))
.y1(y(0))
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line = d3
.line()
.x(d => x(d[0]))
.y(d => y(d[1]))
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x = d3
.scaleLinear()
.domain(d3.extent(years))
.range([margin.left, width - margin.right])
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xAxis = g =>
g
.call(
d3
.axisBottom(x)
.tickValues(years)
.tickFormat(d => `${d}`)
)
.call(g =>
g
.selectAll('.tick text')
.attr('font-size', mobile ? '.9rem' : '1.2rem')
.attr('font-weight', 800)
)
.call(g =>
g
.selectAll('.tick text')
.attr('paint-order', 'stroke')
.attr('stroke-width', '3px')
.attr('stroke', 'white')

.each((text, i, nodes) =>
d3
.select(nodes[i])
.attr(
'text-anchor',
i === nodes.length - 1 ? 'end' : i === 0 ? "start" : "middle"
)
)
)
.attr('transform', `translate(${0}, ${height - margin.bottom})`)
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y = d3
.scaleLinear()
.domain([100, 0])
.range([margin.top, height - margin.bottom])
.clamp(true)
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yAxis = g =>
g
.attr('transform', `translate(${margin.left - 4}, 0)`)
.call(
d3
.axisLeft(y)
.ticks(4)
.tickFormat(dotLabel)
)
.call(g => g.selectAll('.domain').remove())
.call(g => g.attr('font-size', '.8rem').attr('font-weight', 600))
.call(g =>
g
.selectAll('text')
.attr('paint-order', 'stroke')
.attr('stroke-width', '3px')
.attr('stroke', 'white')
)
.call(g =>
g
.selectAll("line")
.clone()
.attr('x2', width - margin.right - margin.left)
.attr('stroke', '#999')
.attr('stroke-dasharray', "2 6")
)
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drag = updateGuess => {
const guesses = new Map(years.map(year => [year, 50]));
function dragstarted() {
d3.select(this).attr("fill", "#333");
}

function dragged(event, d) {
const yVal = Math.round(y.invert(event.y));
d3.select(this)
.raise()
.call(g => g.select('text').text(dotLabel(Math.round(yVal))))
.call(g => g.attr('transform', d => `translate(${x(d)}, ${y(yVal)})`));
updateGuess(d, yVal);
}

function dragended() {
d3.select(this).attr("fill", 'black');
}

return d3
.drag()
.on("start", dragstarted)
.on("drag", dragged)
.on("end", dragended);
}
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margin = ({ top: 30, right: 25, bottom: 40, left: 45 })
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mobile = width < 640
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height = mobile ? (width * 16) / 9 : (width * 9) / 16
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d3 = require('d3@6')
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import { html } from "@observablehq/htl"
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Experiment and prototype by building visualizations in live JavaScript notebooks. Collaborate with your team and decide which concepts to build out.
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