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Edited
Feb 7, 2024
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function SankeyChart({
nodes, // an iterable of node objects (typically [{id}, …]); implied by links if missing
links // an iterable of link objects (typically [{source, target}, …])
}, {
format = ",", // a function or format specifier for values in titles
nodeId = d => d.id, // given d in nodes, returns a unique identifier (string)
nodeGroup, // given d in nodes, returns an (ordinal) value for color
nodeGroups, // an array of ordinal values representing the node groups
nodeLabel, // given d in (computed) nodes, text to label the associated rect
nodeTitle = d => `${d.id}\n${format(d.value)}`, // given d in (computed) nodes, hover text
nodeAlign = d3Sankey.sankeyLeft, // Sankey node alignment strategy: left, right, justify, center
nodeWidth = _nodeWidth, // width of node rects
nodePadding = _padding, // vertical separation between adjacent nodes
nodeLabelPadding = 5, // horizontal separation between node and label
nodeStroke = "currentColor", // stroke around node rects
nodeStrokeWidth, // width of stroke around node rects, in pixels
nodeStrokeOpacity, // opacity of stroke around node rects
nodeStrokeLinejoin, // line join for stroke around node rects
linkSource = ({source}) => source, // given d in links, returns a node identifier string
linkTarget = ({target}) => target, // given d in links, returns a node identifier string
linkValue = ({value}) => value, // given d in links, returns the quantitative value
linkPath = straightLine, // given d in (computed) links, returns the SVG path # working on this
linkTitle = d => `${d.source.id} → ${d.target.id}\n${format(d.value)}`, // given d in (computed) links
linkColor = 'layered', //"#aaa", // source, target, source-target, or static color
linkStrokeOpacity = linkOpacity/100, // link stroke opacity
colors = colorScale, // array of colors
width = _width, // outer width, in pixels
height = _height, // outer height, in pixels
marginTop = 5, // top margin, in pixels
marginRight = 1, // right margin, in pixels
marginBottom = 5, // bottom margin, in pixels
marginLeft = 1, // left margin, in pixels
} = {}) {
// Compute values.
const LS = d3.map(links, linkSource).map(intern);
const LT = d3.map(links, linkTarget).map(intern);
const LV = d3.map(links, linkValue);
if (nodes === undefined) nodes = Array.from(d3.union(LS, LT), id => ({id}));
const N = d3.map(nodes, nodeId).map(intern);
const G = nodeGroup == null ? null : d3.map(nodes, nodeGroup).map(intern);
// Replace the input nodes and links with mutable objects for the simulation.
nodes = d3.map(nodes, (_, i) => ({id: N[i]}));
console.log(nodes)
links = d3.map(links, (_, i) => ({source: LS[i], target: LT[i], value: LV[i]}));
// Compute default domains.
if (G && nodeGroups === undefined) nodeGroups = G;
// Construct the scales.
const color = nodeGroup == null ? null : d3.scaleOrdinal(nodeGroups, colors);
// Compute the Sankey layout.
const sankey = d3Sankey
.sankey()
.nodeId(({index: i}) => N[i])
.nodeAlign(nodeAlign)
.nodeWidth(nodeWidth)
.nodePadding(nodePadding)
.nodeSort(null)
.iterations(_itterations)
.linkSort(linkSort)
.extent([[marginLeft, marginTop], [width - marginRight, height - marginBottom]])
({nodes, links});
// Compute titles and labels using layout nodes, so as to access aggregate values.
if (typeof format !== "function") format = d3.format(format);
const Tl = nodeLabel === undefined ? N : nodeLabel == null ? null : d3.map(nodes, nodeLabel);
const Tt = nodeTitle == null ? null : d3.map(nodes, nodeTitle);
const Lt = linkTitle == null ? null : d3.map(links, linkTitle);
console.log(nodes);
//const Vl = nodeValue === undefined ? N : nodeValue == null ? null : d3.map(nodes, nodeValue);
// A unique identifier for clip paths (to avoid conflicts).
const uid = `O-${Math.random().toString(16).slice(2)}`;
const svg = d3.create("svg")
.attr("width", width)
.attr("height", height)
.attr("viewBox", [0, 0, width, height])
.attr("style", "max-width: 100%; height: auto; height: intrinsic;");
const link = svg.append("g")
.attr("fill", "none")
.selectAll("g")
.data(links)
.join("g")
.attr("stroke-opacity", d => {
if (d.value <= linkThreshold) return 0;
return linkStrokeOpacity;
})
var totalNodes = 16;
link.append("path")
.attr("d", linkPath)
.attr("stroke", function(d) {
if (linkColor === "layered") {
// Use the color of the target node for the last two nodes
if (d.target.index >= totalNodes - 2) {
return color(G[d.target.index]);
} else {
// Use the color of the source node for other nodes
return color(G[d.source.index]);
}
} else if (linkColor === "source-target") {
return `url(#${uid}-link-${d.index})`;
} else if (linkColor === "source") {
return color(G[d.source.index]);
} else if (linkColor === "target") {
return color(G[d.target.index]);
} else {
// Handle other cases or default behavior here
return linkColor;
}
})
.attr("stroke-width", ({width}) => Math.max(1, width))
.attr('stroke-linejoin', 'bevel')
.call(Lt ? path => path.append("title").text(({index: i}) => Lt[i]) : () => {});
const node = svg.append("g")
.attr("stroke", nodeStroke)
.attr("stroke-width", nodeStrokeWidth)
.attr("stroke-opacity", 1)
.attr("stroke-linejoin", nodeStrokeLinejoin)
.selectAll("rect")
.data(nodes)
.join("rect")
.attr("x", d => d.x0)
.attr('y', d => {
if (d.id === 'Grid') return 0;
return d.y0;
})
.attr("height", d => d.y1 - d.y0,30)
.attr("width", d => d.x1 - d.x0);
if (G) node.attr("fill", ({index: i}) => color(G[i]));
if (Tt) node.append("title").text(({index: i}) => Tt[i]);
const Labels = svg.append("g")
.attr("font-family", "sans-serif")
.attr("font-size", 10)
.selectAll("text")
.data(nodes)
.join("text")
.attr("x", d => d.x0 + 34 + (d.layer * 2))
.attr("y", d => {
if (d.value <= 4) {
if (d.id === 'Solar') return d.y1 + 8;
return d.y0 - 8;
}
if (d.id === 'Grid') return (d.y1 - d.y0) / 2;
return (d.y1 + d.y0) / 2;
})
.attr('fill', d => {
if (['Nuclear', 'Hydro', 'Wind', 'Geothermal', 'Coal', 'Petroleum', 'Energy Services'].includes(d.id)) {
if (d.value > 4) return 'white';
}
return 'black';
})
.attr("dy", "0.35em")
.attr("text-anchor", "middle")
.text(({ index: i }) => Tl[i]);
console.log(_mode)
if (_mode === "Verbose") {
Labels.append("tspan")
.attr("x", d => d.x0 + 34 + (d.layer * 2))
.attr("y", d => {
if (d.value <= 4) {
if (d.id === 'Solar') return d.y1 + 18;
return d.y0 + 2;
}
if (d.id === 'Grid') return ((d.y1 - d.y0) / 2) + 10;
return ((d.y1 + d.y0) / 2) + 10;
})
.attr('fill', d => {
if (['Nuclear', 'Hydro', 'Wind', 'Geothermal', 'Coal', 'Petroleum', 'Energy Services'].includes(d.id)) {
if (d.value > 4) return 'white';
}
return 'black';
})
.attr("dy", "0.35em")
.attr("text-anchor", "middle")
.text(d => String(d.value.toFixed(2)));
}
const cloudData = [
{ x: 10, y: 40 },
{ x: 20, y: 32 },
{ x: 30, y: 40 },
{ x: 40, y: 32 },
{ x: 50, y: 40 },
{ x: 60, y: 32 },
{ x: 70, y: 40 },
{ x: 60, y: 48 },
{ x: 50, y: 56 },
{ x: 40, y: 48 },
{ x: 30, y: 56 },
{ x: 20, y: 48 },
{ x: 10, y: 56 },
];
svg.append("g")
.selectAll("circle")
.data(cloudData)
.enter()
.append("circle")
.attr("cx", d => d.x+(width*4/5))
.attr("cy", d => d.y)
.attr("r", 10)
.attr("fill", "grey")
.attr("stroke", "grey");
svg.append("text")
.attr("x", width*9/10)
.attr("y", 60)
.attr("font-size", 50)
.attr("fill","green")
.text("$");
function intern(value) {
return value !== null && typeof value === "object" ? value.valueOf() : value;
}
return Object.assign(svg.node(), {scales: {color}});
}
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.
