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@willzjc

willzjc/.block

Last active February 27, 2018 10:10
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Zoomable Sunburst with Labels
Raw
.block
license: mit
Raw
README.md
Raw
index.html
<head>
<style>
body {
font-family: Sans-serif;
font-size: 11px;
}
.slice {
cursor: pointer;
}
.slice .main-arc {
stroke: #fff;
stroke-width: 1px;
}
.slice .hidden-arc {
fill: none;
}
.slice text {
pointer-events: none;
dominant-baseline: middle;
text-anchor: middle;
}
</style>
<script src='https://d3js.org/d3.v4.min.js'></script>
</head>
<body>
<script>
const width = window.innerWidth,
height = window.innerHeight,
maxRadius = (Math.min(width, height) / 2) - 5;
const formatNumber = d3.format(',d');
const x = d3.scaleLinear()
.range([0, 2 * Math.PI])
.clamp(true);
const y = d3.scaleSqrt()
.range([maxRadius*.1, maxRadius]);
const color = d3.scaleOrdinal(d3.schemeCategory20);
const partition = d3.partition();
const arc = d3.arc()
.startAngle(d => x(d.x0))
.endAngle(d => x(d.x1))
.innerRadius(d => Math.max(0, y(d.y0)))
.outerRadius(d => Math.max(0, y(d.y1)));
const middleArcLine = d => {
const halfPi = Math.PI/2;
const angles = [x(d.x0) - halfPi, x(d.x1) - halfPi];
const r = Math.max(0, (y(d.y0) + y(d.y1)) / 2);
const middleAngle = (angles[1] + angles[0]) / 2;
const invertDirection = middleAngle > 0 && middleAngle < Math.PI; // On lower quadrants write text ccw
if (invertDirection) { angles.reverse(); }
const path = d3.path();
path.arc(0, 0, r, angles[0], angles[1], invertDirection);
return path.toString();
};
const textFits = d => {
const CHAR_SPACE = 6;
const deltaAngle = x(d.x1) - x(d.x0);
const r = Math.max(0, (y(d.y0) + y(d.y1)) / 2);
const perimeter = r * deltaAngle;
return d.data.name.length * CHAR_SPACE < perimeter;
};
const svg = d3.select('body').append('svg')
.style('width', '100vw')
.style('height', '100vh')
.attr('viewBox', `${-width / 2} ${-height / 2} ${width} ${height}`)
.on('click', () => focusOn()); // Reset zoom on canvas click
d3.json('https://gist.githubusercontent.com/mbostock/4348373/raw/85f18ac90409caa5529b32156aa6e71cf985263f/flare.json', (error, root) => {
if (error) throw error;
root = d3.hierarchy(root);
root.sum(d => d.size);
const slice = svg.selectAll('g.slice')
.data(partition(root).descendants());
slice.exit().remove();
const newSlice = slice.enter()
.append('g').attr('class', 'slice')
.on('click', d => {
d3.event.stopPropagation();
focusOn(d);
});
newSlice.append('title')
.text(d => d.data.name + '\n' + formatNumber(d.value));
newSlice.append('path')
.attr('class', 'main-arc')
.style('fill', d => color((d.children ? d : d.parent).data.name))
.attr('d', arc);
newSlice.append('path')
.attr('class', 'hidden-arc')
.attr('id', (_, i) => `hiddenArc${i}`)
.attr('d', middleArcLine);
const text = newSlice.append('text')
.attr('display', d => textFits(d) ? null : 'none');
// Add white contour
text.append('textPath')
.attr('startOffset','50%')
.attr('xlink:href', (_, i) => `#hiddenArc${i}` )
.text(d => d.data.name)
.style('fill', 'none')
.style('stroke', '#fff')
.style('stroke-width', 5)
.style('stroke-linejoin', 'round');
text.append('textPath')
.attr('startOffset','50%')
.attr('xlink:href', (_, i) => `#hiddenArc${i}` )
.text(d => d.data.name);
});
function focusOn(d = { x0: 0, x1: 1, y0: 0, y1: 1 }) {
// Reset to top-level if no data point specified
const transition = svg.transition()
.duration(750)
.tween('scale', () => {
const xd = d3.interpolate(x.domain(), [d.x0, d.x1]),
yd = d3.interpolate(y.domain(), [d.y0, 1]);
return t => { x.domain(xd(t)); y.domain(yd(t)); };
});
transition.selectAll('path.main-arc')
.attrTween('d', d => () => arc(d));
transition.selectAll('path.hidden-arc')
.attrTween('d', d => () => middleArcLine(d));
transition.selectAll('text')
.attrTween('display', d => () => textFits(d) ? null : 'none');
moveStackToFront(d);
//
function moveStackToFront(elD) {
svg.selectAll('.slice').filter(d => d === elD)
.each(function(d) {
this.parentNode.appendChild(this);
if (d.parent) { moveStackToFront(d.parent); }
})
}
}
</script>
</body>
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