Research Scientist at Meta / CZI (started December 2018). Building 'Scientific Knowledge Engineering' tools and systems.
Published
Edited
Apr 13, 2020
chart = {
const root = tree(data);
const svg = d3.create("svg")
.style("font", "10px sans-serif")
.style("margin", "5px");
const link = svg.append("g")
.attr("fill", "none")
.attr("stroke", "#555")
.attr("stroke-opacity", 0.4)
.attr("stroke-width", 1.5)
.selectAll("path")
.data(root.links())
.join("path")
.attr("d", d => `
M${d.target.y},${d.target.x}
C${d.source.y + root.dy / 2},${d.target.x}
${d.source.y + root.dy / 2},${d.source.x}
${d.source.y},${d.source.x}
`);
const node = svg.append("g")
.attr("stroke-linejoin", "round")
.attr("stroke-width", 3)
.selectAll("g")
.data(root.descendants())
.join("g")
.attr("transform", d => `translate(${d.y},${d.x})`);
node.append("circle")
.attr("fill", d => d.children ? "#555" : "#999")
.attr("r", 2.5);
node.append("text")
.attr("dy", "0.31em")
.attr("x", d => d.children ? -6 : 6)
.text(d => d.data.name)
.filter(d => d.children)
.attr("text-anchor", "end")
.clone(true).lower()
.attr("stroke", "white");
yield svg.node();
svg.attr("viewBox", autoBox);
}
function autoBox() {
const {x, y, width, height} = this.getBBox();
return [x, y, width, height];
}
data = FileAttachment("by_anatomical_system@6.json").json()
tree = data => {
const root = d3.hierarchy(data).sort((a, b) => d3.descending(a.height, b.height) || d3.ascending(a.data.name, b.data.name));
root.dx = 10;
root.dy = width / (root.height + 1);
return d3.cluster().nodeSize([root.dx, root.dy])(root);
}
d3 = require("d3@5")
DOM.download(() => serialize(chart), undefined, "Save as SVG")
serialize = {
const xmlns = "http://www.w3.org/2000/xmlns/";
const xlinkns = "http://www.w3.org/1999/xlink";
const svgns = "http://www.w3.org/2000/svg";
return function serialize(svg) {
svg = svg.cloneNode(true);
const fragment = window.location.href + "#";
const walker = document.createTreeWalker(svg, NodeFilter.SHOW_ELEMENT, null, false);
while (walker.nextNode()) {
for (const attr of walker.currentNode.attributes) {
if (attr.value.includes(fragment)) {
attr.value = attr.value.replace(fragment, "#");
}
}
}
svg.setAttributeNS(xmlns, "xmlns", svgns);
svg.setAttributeNS(xmlns, "xmlns:xlink", xlinkns);
const serializer = new window.XMLSerializer;
const string = serializer.serializeToString(svg);
return new Blob([string], {type: "image/svg+xml"});
};
}
DOM.download(() => rasterize(chart), undefined, "Save as PNG")
function rasterize(svg) {
let resolve, reject;
const promise = new Promise((y, n) => (resolve = y, reject = n));
const image = new Image;
image.onerror = reject;
image.onload = () => {
const rect = svg.getBoundingClientRect();
const context = DOM.context2d(rect.width, rect.height);
context.drawImage(image, 0, 0, rect.width, rect.height);
context.canvas.toBlob(resolve);
};
image.src = URL.createObjectURL(serialize(svg));
return promise;
}
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