chart = {
const root = root0;
// root.each((d) => {
// d.current = d;
// d.value = 1;
// });
const aHistory = [];
let oLastZoomed = root;
root.each((d) => (d.current = d));
const svg = d3
.select(DOM.svg(width, width))
.style("width", "100%")
.style("height", "auto")
.style("padding", "10px")
.style("font", "10px sans-serif")
.style("box-sizing", "border-box");
const g = svg.append("g");
let paths = g
.append("g")
.attr("fill-opacity", 0.6)
.selectAll("path")
.data(root.descendants())
.enter()
.append("path")
.attr("fill", (d) => {
while (d.depth > 1) d = d.parent;
return !d.depth ? "none" : color(d.data.name);
})
.attr("fill-opacity", (d) => (d.children ? 0.6 : 0.4))
.attr("d", arc)
.attr("id", function (d, i) {
return "cp-" + i;
});
paths.append("title").text(
(d) =>
`${d
.ancestors()
.map((d) => d.data.name)
.reverse()
.join("/")}\n${format(d.value)}`
);
paths
.filter((d) => d.children)
.style("cursor", "pointer")
.on("click", clicked);
const labels = g
.append("g")
.attr("pointer-events", "none")
.attr("text-anchor", "middle")
.selectAll("text")
.data(root.descendants().filter((d) => d.depth))
.enter()
.append("text")
.attr("transform", (d) => labelTransform(d))
.attr("fill-opacity", (d) => +labelVisible(d))
.attr("dy", "0.35em")
.attr("clip-path", function (d, i) {
return "url(#cp-" + i + ")";
})
.text((d) => arcText(d, d.data.name));
function labelVisible(d) {
return d.x1 - d.x0 > 0 && ((d.y0 + d.y1) / 2) * (d.x1 - d.x0) > 10;
}
function labelTransform(d) {
const x = (((d.x0 + d.x1) / 2) * 180) / Math.PI;
const y = (d.y0 + d.y1) / 2;
return `rotate(${x - 90}) translate(${y},0) rotate(${x < 180 ? 0 : 180})`;
}
// Label of an arc
function arcText(d, sKey) {
var CHAR_SPACE = 7,
deltaAngle = d.x1 - d.x0,
r = Math.max(0, (d.y0 + d.y1) / 2),
perimeter = r * deltaAngle,
iMinLength = 3, // minimum length of label
iMaxLength = Math.floor(perimeter / CHAR_SPACE);
iMaxLength = iMaxLength < iMinLength ? 0 : iMaxLength;
// Need to tune it better
return sKey; //(sKey || '').toString().slice(0, iMaxLength);
}
function clicked(p) {
/**
* First time, mark the clicked node as zoomed;
* Second time, un-mark the node as zoomed.
* When an already zoomed node is clicked, lets zoom out to its parent or root.
*/
let target;
// determine actual node to highlight
// root will have no parent
if (p.depth > 1) {
target = p.bZoomed ? p : p.children ? p : p.parent;
} else {
target = p;
}
if (target.bZoomed) {
delete target.bZoomed;
target = oLastZoomed = aHistory.pop();
if (!aHistory.length) {
root.bHighlighted = true;
target = oLastZoomed = root;
}
} else {
target.bZoomed = true;
if (oLastZoomed) {
aHistory.push(oLastZoomed);
}
oLastZoomed = target;
}
root.each(function (d) {
d.target = {
x0:
Math.max(
0,
Math.min(1, (d.x0 - target.x0) / (target.x1 - target.x0))
) *
2 *
Math.PI,
x1:
Math.max(
0,
Math.min(1, (d.x1 - target.x0) / (target.x1 - target.x0))
) *
2 *
Math.PI,
y0: Math.max(0, d.y0 - target.y0),
y1: Math.max(0, d.y1 - target.y0)
};
});
const t = g.transition().duration(750);
// Transition the data on all arcs, even the ones that aren’t visible,
// so that if this transition is interrupted, entering arcs will start
// the next transition from the desired position.
paths
.transition(t)
.tween("data", (d) => {
const i = d3.interpolate(d.current, d.target);
return (t) => (d.current = i(t));
})
.attrTween("d", (d) => () => arc(d.current));
labels
.transition(t)
.attr("fill-opacity", (d) => +labelVisible(d.target))
.attrTween("transform", (d) => () => labelTransform(d.current));
}
document.body.appendChild(svg.node());
const box = g.node().getBBox();
svg
.remove()
.attr("width", box.width)
.attr("height", box.height)
.attr("viewBox", `${box.x} ${box.y} ${box.width} ${box.height}`);
return svg.node();
}
Purpose-built for displays of data
Observable is your go-to platform for exploring data and creating expressive data visualizations. Use reactive JavaScript notebooks for prototyping and a collaborative canvas for visual data exploration and dashboard creation.
