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Forked from tomshanley/channel-shift.json
Created April 15, 2020 23:19
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Sankey chart with links sorted by category

Sankey chart with the sankey.js amended to sort the links alphabetically by d.category. An improvement will be to sort by d.category and then by its source/target node.

{"nodes":[
{"name":"Face-to-Face 2014"},
{"name":"Contact Centre 2014"},
{"name":"Digital 2014"},
{"name":"Face-to-Face 2020"},
{"name":"Contact Centre 2020"},
{"name":"Digital 2020"},
{"name":"Removed 2020"}
],
"links":[
{"source":0,"target":5,"value":100,"type":"confirmation"},
{"source":1,"target":5,"value":100,"type":"confirmation"},
{"source":2,"target":5,"value":100,"type":"confirmation"},
{"source":0,"target":3,"value":50,"type":"interaction"},
{"source":0,"target":4,"value":50,"type":"interaction"},
{"source":1,"target":4,"value":50,"type":"interaction"},
{"source":2,"target":4,"value":50,"type":"interaction"},
{"source":2,"target":5,"value":30,"type":"interaction"},
{"source":1,"target":5,"value":30,"type":"interaction"},
{"source":0,"target":3,"value":10,"type":"transaction"},
{"source":0,"target":4,"value":45,"type":"transaction"},
{"source":1,"target":4,"value":20,"type":"transaction"},
{"source":2,"target":4,"value":20,"type":"transaction"},
{"source":1,"target":5,"value":60,"type":"transaction"},
{"source":0,"target":5,"value":45,"type":"transaction"},
{"source":2,"target":5,"value":60,"type":"transaction"},
{"source":1,"target":5,"value":100,"type":"information"},
{"source":2,"target":5,"value":100,"type":"information"},
{"source":0,"target":5,"value":100,"type":"information"},
{"source":2,"target":6,"value":30,"type":"information"}
]}
<!DOCTYPE html>
<html>
<meta charset="utf-8">
<title>Channel Shift</title>
<style>
body {
font-family: "Cambria", serif;
}
#chart {
height: 500px;
}
.node rect {
cursor: move;
fill-opacity: .9;
shape-rendering: crispEdges;
}
.node text {
pointer-events: none;
text-shadow: 0 1px 0 #fff;
font-family: "Cambria", serif;
}
.link-confirmation {
fill: none;
stroke-opacity: .5;
}
.link-confirmation {
fill: none;
stroke: red;
stroke-opacity: .5;
}
.link-interaction {
fill: none;
stroke: green;
stroke-opacity: .5;
}
.link-transaction {
fill: none;
stroke: blue;
stroke-opacity: .5;
}
.link-information {
fill: none;
stroke: orange;
stroke-opacity: .5;
}
.link-information:hover {
stroke-opacity: .7;
}
.link-transaction:hover {
stroke-opacity: .7;
}
.link-interaction:hover {
stroke-opacity: .7;
}
.link-confirmation:hover {
stroke-opacity: .7;
}
table
{
border-spacing:5px;
}
</style>
<body>
<table style="width:300px">
<tr>
<td style="background-color:red">Confirmation</td>
<td style="background-color:orange">Information</td>
<td style="background-color:green">Interaction</td>
<td style="background-color:blue">Transaction</td>
</tr>
</table>
<p id="chart">
<script src="http://d3js.org/d3.v3.min.js"></script>
<script src="sankey-cs.js"></script>
<script src="http://d3js.org/colorbrewer.v1.min.js"></script>
<script>
var margin = {top: 1, right: 1, bottom: 6, left: 1},
width = 960 - margin.left - margin.right,
height = 500 - margin.top - margin.bottom;
var formatNumber = d3.format(",.0f"),
color = d3.scale.category20();
var typesColour = d3.scale.ordinal()
.domain(["interaction", "information", "confirmation", "transaction"])
//.range(colorbrewer.BuGn[4])
.range(["red","yellow","blue","green"])
;
var svg = d3.select("#chart").append("svg")
.attr("width", width + margin.left + margin.right)
.attr("height", height + margin.top + margin.bottom)
.append("g")
.attr("transform", "translate(" + margin.left + "," + margin.top + ")");
var sankey = d3.sankey()
.nodeWidth(30)
.nodePadding(30)
.layout(1)
.size([width, height]);
var path = sankey.link();
d3.json("channel-shift.json", function(energy) {
sankey
.nodes(energy.nodes)
.links(energy.links)
.layout(32);
var link = svg.append("g").selectAll(".link")
.data(energy.links)
.enter().append("path")
.attr("class", function(d) { return "link-" + d.type;} )
.attr("d", path)
//.attr("stroke", typesColour(function(d) { return d.type;} ))
.style("stroke-width", function(d) { return Math.max(1, d.dy); })
.sort(function(a, b) { return b.dy - a.dy; });
link.append("title")
.text(function(d) { return d.source.name + " → " + d.target.name + "\n" + d.type; });
//d3.selectAll("path").style("stroke", typesColour(function(d) { return d.type; }));
var node = svg.append("g").selectAll(".node")
.data(energy.nodes)
.enter().append("g")
.attr("class", "node")
.attr("transform", function(d) { return "translate(" + d.x + "," + d.y + ")"; })
.call(d3.behavior.drag()
.origin(function(d) { return d; })
.on("dragstart", function() { this.parentNode.appendChild(this); })
.on("drag", dragmove));
node.append("rect")
.attr("height", function(d) { return d.dy; })
.attr("width", sankey.nodeWidth())
.style("fill", function(d) { return d.color = color(d.name.replace(/ .*/, "")); })
//.style("stroke", function(d) { return d3.rgb(d.color).darker(2); })
.append("title")
.text(function(d) { return d.name ; });
node.append("text")
.attr("x", -6)
.attr("y", function(d) { return d.dy / 2; })
.attr("dy", ".35em")
.attr("text-anchor", "end")
.attr("transform", null)
.text(function(d) { return d.name; })
.filter(function(d) { return d.x < width / 2; })
.attr("x", 6 + sankey.nodeWidth())
.attr("text-anchor", "start");
function dragmove(d) {
d3.select(this).attr("transform", "translate(" + d.x + "," + (d.y = Math.max(0, Math.min(height - d.dy, d3.event.y))) + ")");
sankey.relayout();
link.attr("d", path);
}
function fade(opacity) {
return function(g, i) {
var elements = svg.selectAll(".node");
elements = elements.filter(function(d) { return d.name != graph.nodes[i].name });
elements.transition()
.style("opacity", opacity);
svg.selectAll(".link")
.filter(function(d) { return d.source.name != graph.nodes[i].name && d.target.name != graph.nodes[i].name })
.transition()
.style("opacity", opacity);
};
}
});
</script>
d3.sankey = function() {
var sankey = {},
nodeWidth = 24,
nodePadding = 8,
size = [1, 1],
nodes = [],
links = [];
sankey.nodeWidth = function(_) {
if (!arguments.length) return nodeWidth;
nodeWidth = +_;
return sankey;
};
sankey.nodePadding = function(_) {
if (!arguments.length) return nodePadding;
nodePadding = +_;
return sankey;
};
sankey.nodes = function(_) {
if (!arguments.length) return nodes;
nodes = _;
return sankey;
};
sankey.links = function(_) {
if (!arguments.length) return links;
links = _;
return sankey;
};
sankey.size = function(_) {
if (!arguments.length) return size;
size = _;
return sankey;
};
sankey.layout = function(iterations) {
computeNodeLinks();
computeNodeValues();
computeNodeBreadths();
computeNodeDepths(iterations);
computeLinkDepths();
return sankey;
};
sankey.relayout = function() {
computeLinkDepths();
return sankey;
};
sankey.link = function() {
var curvature = .5;
function link(d) {
var x0 = d.source.x + d.source.dx,
x1 = d.target.x,
xi = d3.interpolateNumber(x0, x1),
x2 = xi(curvature),
x3 = xi(1 - curvature),
y0 = d.source.y + d.sy + d.dy / 2,
y1 = d.target.y + d.ty + d.dy / 2;
return "M" + x0 + "," + y0
+ "C" + x2 + "," + y0
+ " " + x3 + "," + y1
+ " " + x1 + "," + y1;
}
link.curvature = function(_) {
if (!arguments.length) return curvature;
curvature = +_;
return link;
};
return link;
};
// Populate the sourceLinks and targetLinks for each node.
// Also, if the source and target are not objects, assume they are indices.
function computeNodeLinks() {
nodes.forEach(function(node) {
node.sourceLinks = [];
node.targetLinks = [];
});
links.forEach(function(link) {
var source = link.source,
target = link.target;
if (typeof source === "number") source = link.source = nodes[link.source];
if (typeof target === "number") target = link.target = nodes[link.target];
source.sourceLinks.push(link);
target.targetLinks.push(link);
});
//TOMS EDIT
/*nodes.forEach(function(node) {
node.sourceLinks.sort();
node.targetLinks.sort();
});*/
}
// Compute the value (size) of each node by summing the associated links.
function computeNodeValues() {
nodes.forEach(function(node) {
node.value = Math.max(
d3.sum(node.sourceLinks, value),
d3.sum(node.targetLinks, value)
);
});
}
// Iteratively assign the breadth (x-position) for each node.
// Nodes are assigned the maximum breadth of incoming neighbors plus one;
// nodes with no incoming links are assigned breadth zero, while
// nodes with no outgoing links are assigned the maximum breadth.
function computeNodeBreadths() {
var remainingNodes = nodes,
nextNodes,
x = 0;
while (remainingNodes.length) {
nextNodes = [];
remainingNodes.forEach(function(node) {
node.x = x;
node.dx = nodeWidth;
node.sourceLinks.forEach(function(link) {
nextNodes.push(link.target);
});
});
remainingNodes = nextNodes;
++x;
}
//
moveSinksRight(x);
scaleNodeBreadths((size[0] - nodeWidth) / (x - 1));
}
function moveSourcesRight() {
nodes.forEach(function(node) {
if (!node.targetLinks.length) {
node.x = d3.min(node.sourceLinks, function(d) { return d.target.x; }) - 1;
}
});
}
function moveSinksRight(x) {
nodes.forEach(function(node) {
if (!node.sourceLinks.length) {
node.x = x - 1;
}
});
}
function scaleNodeBreadths(kx) {
nodes.forEach(function(node) {
node.x *= kx;
});
}
function computeNodeDepths(iterations) {
var nodesByBreadth = d3.nest()
.key(function(d) { return d.x; })
.sortKeys(d3.ascending)
.entries(nodes)
.map(function(d) { return d.values; });
//
initializeNodeDepth();
resolveCollisions();
for (var alpha = 1; iterations > 0; --iterations) {
relaxRightToLeft(alpha *= .99);
resolveCollisions();
relaxLeftToRight(alpha);
resolveCollisions();
}
function initializeNodeDepth() {
var ky = d3.min(nodesByBreadth, function(nodes) {
return (size[1] - (nodes.length - 1) * nodePadding) / d3.sum(nodes, value);
});
nodesByBreadth.forEach(function(nodes) {
nodes.forEach(function(node, i) {
node.y = i;
node.dy = node.value * ky;
});
});
links.forEach(function(link) {
link.dy = link.value * ky;
});
}
function relaxLeftToRight(alpha) {
nodesByBreadth.forEach(function(nodes, breadth) {
nodes.forEach(function(node) {
if (node.targetLinks.length) {
var y = d3.sum(node.targetLinks, weightedSource) / d3.sum(node.targetLinks, value);
node.y += (y - center(node)) * alpha;
}
});
});
function weightedSource(link) {
return center(link.source) * link.value;
}
}
function relaxRightToLeft(alpha) {
nodesByBreadth.slice().reverse().forEach(function(nodes) {
nodes.forEach(function(node) {
if (node.sourceLinks.length) {
var y = d3.sum(node.sourceLinks, weightedTarget) / d3.sum(node.sourceLinks, value);
node.y += (y - center(node)) * alpha;
}
});
});
function weightedTarget(link) {
return center(link.target) * link.value;
}
}
function resolveCollisions() {
nodesByBreadth.forEach(function(nodes) {
var node,
dy,
y0 = 0,
n = nodes.length,
i;
// Push any overlapping nodes down.
nodes.sort(ascendingDepth);
for (i = 0; i < n; ++i) {
node = nodes[i];
dy = y0 - node.y;
if (dy > 0) node.y += dy;
y0 = node.y + node.dy + nodePadding;
}
// If the bottommost node goes outside the bounds, push it back up.
dy = y0 - nodePadding - size[1];
if (dy > 0) {
y0 = node.y -= dy;
// Push any overlapping nodes back up.
for (i = n - 2; i >= 0; --i) {
node = nodes[i];
dy = node.y + node.dy + nodePadding - y0;
if (dy > 0) node.y -= dy;
y0 = node.y;
}
}
});
}
function ascendingDepth(a, b) {
return a.y - b.y;
}
}
function computeLinkDepths() {
nodes.forEach(function(node) {
console.log(node.sourceLinks);
node.sourceLinks.sort(typeSort); // ascendingTargetDepth
node.targetLinks.sort(typeSort); // was ascendingTargetDepth
});
nodes.forEach(function(node) {
var sy = 0, ty = 0;
node.sourceLinks.forEach(function(link) {
link.sy = sy;
sy += link.dy;
});
node.targetLinks.forEach(function(link) {
link.ty = ty;
ty += link.dy;
});
});
function ascendingSourceDepth(a, b) {
return a.source.y - b.source.y;
}
function ascendingTargetDepth(a, b) {
return a.target.y - b.target.y;
}
// function to sort by link type
function typeSort(a, b) {
if(a.type < b.type) return -1;
if(a.type > b.type) return 1;
}
}
function center(node) {
return node.y + node.dy / 2;
}
function value(link) {
return link.value;
}
return sankey;
};
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