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Created December 9, 2015 22:02
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sankey diagram in d3
Raw
index.html
<!DOCTYPE html>
<!-- Adapted from D3Noob and Mike Bostock -->
<!-- http://bost.ocks.org/mike/sankey/ -->
<!-- http://bl.ocks.org/d3noob/5028304 -->
<meta charset="utf-8">
<title>Stock-Flow Diagram</title>
<style>
.node rect {
cursor: move;
fill-opacity: .9;
shape-rendering: crispEdges;
}
.node text {
pointer-events: none;
text-shadow: 0 1px 0 #fff;
}
.link {
fill: none;
stroke: #000;
stroke-opacity: .2;
}
.link:hover {
stroke-opacity: .5;
}
</style>
<body>
<p id="chart">
<script src="http://d3js.org/d3.v3.js"></script>
<script src="sankey.js"></script>
<script>
var units = "% students";
var margin = {top: 10, right: 10, bottom: 10, left: 10},
width = 1200 - margin.left - margin.right,
height = 740 - margin.top - margin.bottom;
var formatNumber = d3.format(",.0f"), // two decimal places
format = function(d) { return formatNumber(d*100) + units; },
color = d3.scale.ordinal().range([ "#FF0000", "#88FF88", "#FFFF00", "#008000","#0000FF"]);
// append the svg canvas to the page
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 + ")");
// Set the sankey diagram properties
var sankey = d3.sankey()
.nodeWidth(20)
.nodePadding(5)
.size([width, height]);
var path = sankey.link();
// load the data
d3.json("sankey.json", function(error, graph) {
console.log(graph.nodes);
var nodeMap = {};
graph.nodes.forEach(function(x) { nodeMap[x.name] = x; });
graph.links = graph.links.map(function(x) {
return {
source: nodeMap[x.source],
target: nodeMap[x.target],
value: x.value
};
});
graph.nodes.sort(function(a,b) { d3.ascending(a.name.substring(3,4),b.name.substring(3,4)) });
color.domain(graph.nodes.map( function(d) {
return d.name.substring(3,d.name.length);
}));
sankey
.nodes(graph.nodes)
.links(graph.links)
.layout(32);
// add in the links
var link = svg.append("g").selectAll(".link")
.data(graph.links)
.enter().append("path")
.attr("class", "link")
.attr("d", path)
.style("stroke-width", function(d) { return Math.max(1, d.dy); })
.sort(function(a, b) { return b.dy - a.dy; });
// add the link titles
link.append("title")
.text(function(d) {
return d.source.name.substring(6,d.source.name.length) + " → " +
d.target.name.substring(6,d.source.name.length) + "\n" + format(d.value); });
// add in the nodes
var node = svg.append("g").selectAll(".node")
.data(graph.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));
// add the rectangles for the nodes
node.append("rect")
.attr("height", function(d) { return d.dy; })
.attr("width", sankey.nodeWidth())
.style("fill", function(d) {
return color(d.name.substring(3,d.name.length)); })
.style("stroke", function(d) {
return d3.rgb(d.color).darker(2); })
.append("title")
.text(function(d) {
return d.name.substring(6,d.name.length) +
"\n" + format(d.value); });
// add in the title for the nodes
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.substring(6,d.name.length);
})
.filter(function(d) { return d.x < width / 2; })
.attr("x", 6 + sankey.nodeWidth())
.attr("text-anchor", "start");
// the function for moving the nodes
function dragmove(d) {
d3.select(this).attr("transform",
"translate(" + (
d.x = Math.max(0, Math.min(width - d.dx, d3.event.x))
) + "," + (
d.y = Math.max(0, Math.min(height - d.dy, d3.event.y))
) + ")");
sankey.relayout();
link.attr("d", path);
}
});
</script>
</body>
</html>
Raw
sankey.js
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);
});
}
// 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;
return b.y - a.y;
}
}
function computeLinkDepths() {
nodes.forEach(function(node) {
node.sourceLinks.sort(ascendingTargetDepth);
node.targetLinks.sort(ascendingSourceDepth);
});
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 center(node) {
return node.y + node.dy / 2;
//return 0;
}
function value(link) {
return link.value;
}
return sankey;
};
Raw
sankey.json
{
"links": [
{"source":"t0_3: Off Track","target":"t1_3: Off Track","value":"1.65","count":165},{"source":"t0_3: Off Track","target":"t1_4: Almost On Track","value":"0.21","count":21},{"source":"t0_3: Off Track","target":"t1_5: On Track - Local","value":"0.01","count":1},{"source":"t0_3: Off Track","target":"t1_6: On Track - Regents","value":"0.3","count":30},{"source":"t0_3: Off Track","target":"t1_7: On Track - Adv Regents","value":"0.13","count":13},{"source":"t0_4: Almost On Track","target":"t1_3: Off Track","value":"0.44","count":44},{"source":"t0_4: Almost On Track","target":"t1_4: Almost On Track","value":"1.66","count":166},{"source":"t0_4: Almost On Track","target":"t1_5: On Track - Local","value":"0.04","count":4},{"source":"t0_4: Almost On Track","target":"t1_6: On Track - Regents","value":"0.77","count":77},{"source":"t0_4: Almost On Track","target":"t1_7: On Track - Adv Regents","value":"0.09","count":9},{"source":"t0_5: On Track - Local","target":"t1_3: Off Track","value":"0.01","count":1},{"source":"t0_5: On Track - Local","target":"t1_4: Almost On Track","value":"0.05","count":5},{"source":"t0_5: On Track - Local","target":"t1_5: On Track - Local","value":"0.25","count":25},{"source":"t0_5: On Track - Local","target":"t1_6: On Track - Regents","value":"0.09","count":9},{"source":"t0_5: On Track - Local","target":"t1_7: On Track - Adv Regents","value":"0.05","count":5},{"source":"t0_6: On Track - Regents","target":"t1_3: Off Track","value":"0.31","count":31},{"source":"t0_6: On Track - Regents","target":"t1_4: Almost On Track","value":"0.42","count":42},{"source":"t0_6: On Track - Regents","target":"t1_5: On Track - Local","value":"0.02","count":2},{"source":"t0_6: On Track - Regents","target":"t1_6: On Track - Regents","value":"2.85","count":285},{"source":"t0_6: On Track - Regents","target":"t1_7: On Track - Adv Regents","value":"0.65","count":65},{"source":"t1_3: Off Track","target":"t2_3: Off Track","value":"1.82","count":182},{"source":"t1_3: Off Track","target":"t2_4: Almost On Track","value":"0.19","count":19},{"source":"t1_3: Off Track","target":"t2_5: On Track - Local","value":"0.01","count":1},{"source":"t1_3: Off Track","target":"t2_6: On Track - Regents","value":"0.33","count":33},{"source":"t1_3: Off Track","target":"t2_7: On Track - Adv Regents","value":"0.06","count":6},{"source":"t1_4: Almost On Track","target":"t2_3: Off Track","value":"0.35","count":35},{"source":"t1_4: Almost On Track","target":"t2_4: Almost On Track","value":"1.41","count":141},{"source":"t1_4: Almost On Track","target":"t2_5: On Track - Local","value":"0.02","count":2},{"source":"t1_4: Almost On Track","target":"t2_6: On Track - Regents","value":"0.46","count":46},{"source":"t1_4: Almost On Track","target":"t2_7: On Track - Adv Regents","value":"0.1","count":10},{"source":"t1_5: On Track - Local","target":"t2_3: Off Track","value":"0.01","count":1},{"source":"t1_5: On Track - Local","target":"t2_4: Almost On Track","value":"0.03","count":3},{"source":"t1_5: On Track - Local","target":"t2_5: On Track - Local","value":"0.21","count":21},{"source":"t1_5: On Track - Local","target":"t2_6: On Track - Regents","value":"0.05","count":5},{"source":"t1_5: On Track - Local","target":"t2_7: On Track - Adv Regents","value":"0.02","count":2},{"source":"t1_6: On Track - Regents","target":"t2_3: Off Track","value":"0.29","count":29},{"source":"t1_6: On Track - Regents","target":"t2_4: Almost On Track","value":"0.39","count":39},{"source":"t1_6: On Track - Regents","target":"t2_5: On Track - Local","value":"0.02","count":2},{"source":"t1_6: On Track - Regents","target":"t2_6: On Track - Regents","value":"2.72","count":272},{"source":"t1_6: On Track - Regents","target":"t2_7: On Track - Adv Regents","value":"0.59","count":59},{"source":"t1_7: On Track - Adv Regents","target":"t2_3: Off Track","value":"0.06","count":6},{"source":"t1_7: On Track - Adv Regents","target":"t2_4: Almost On Track","value":"0.05","count":5},{"source":"t1_7: On Track - Adv Regents","target":"t2_5: On Track - Local","value":"0.02","count":2},{"source":"t1_7: On Track - Adv Regents","target":"t2_6: On Track - Regents","value":"0.12","count":12},{"source":"t1_7: On Track - Adv Regents","target":"t2_7: On Track - Adv Regents","value":"0.67","count":67},{"source":"t2_3: Off Track","target":"t3_3: Off Track","value":"1.8","count":180},{"source":"t2_3: Off Track","target":"t3_4: Almost On Track","value":"0.22","count":22},{"source":"t2_3: Off Track","target":"t3_5: On Track - Local","value":"0.03","count":3},{"source":"t2_3: Off Track","target":"t3_6: On Track - Regents","value":"0.39","count":39},{"source":"t2_3: Off Track","target":"t3_7: On Track - Adv Regents","value":"0.09","count":9},{"source":"t2_4: Almost On Track","target":"t3_3: Off Track","value":"0.29","count":29},{"source":"t2_4: Almost On Track","target":"t3_4: Almost On Track","value":"1.22","count":122},{"source":"t2_4: Almost On Track","target":"t3_5: On Track - Local","value":"0.03","count":3},{"source":"t2_4: Almost On Track","target":"t3_6: On Track - Regents","value":"0.4","count":40},{"source":"t2_4: Almost On Track","target":"t3_7: On Track - Adv Regents","value":"0.13","count":13},{"source":"t2_5: On Track - Local","target":"t3_3: Off Track","value":"0.02","count":2},{"source":"t2_5: On Track - Local","target":"t3_4: Almost On Track","value":"0.05","count":5},{"source":"t2_5: On Track - Local","target":"t3_5: On Track - Local","value":"0.13","count":13},{"source":"t2_5: On Track - Local","target":"t3_6: On Track - Regents","value":"0.08","count":8},{"source":"t2_6: On Track - Regents","target":"t3_3: Off Track","value":"0.21","count":21},{"source":"t2_6: On Track - Regents","target":"t3_4: Almost On Track","value":"0.44","count":44},{"source":"t2_6: On Track - Regents","target":"t3_5: On Track - Local","value":"0.07","count":7},{"source":"t2_6: On Track - Regents","target":"t3_6: On Track - Regents","value":"2.43","count":243},{"source":"t2_6: On Track - Regents","target":"t3_7: On Track - Adv Regents","value":"0.53","count":53},{"source":"t2_7: On Track - Adv Regents","target":"t3_3: Off Track","value":"0.05","count":5},{"source":"t2_7: On Track - Adv Regents","target":"t3_4: Almost On Track","value":"0.11","count":11},{"source":"t2_7: On Track - Adv Regents","target":"t3_5: On Track - Local","value":"0.03","count":3},{"source":"t2_7: On Track - Adv Regents","target":"t3_6: On Track - Regents","value":"0.2","count":20},{"source":"t2_7: On Track - Adv Regents","target":"t3_7: On Track - Adv Regents","value":"1.05","count":105},{"source":"t3_3: Off Track","target":"t4_3: Off Track","value":"1.62","count":162},{"source":"t3_3: Off Track","target":"t4_4: Almost On Track","value":"0.26","count":26},{"source":"t3_3: Off Track","target":"t4_5: On Track - Local","value":"0.02","count":2},{"source":"t3_3: Off Track","target":"t4_6: On Track - Regents","value":"0.37","count":37},{"source":"t3_3: Off Track","target":"t4_7: On Track - Adv Regents","value":"0.1","count":10},{"source":"t3_4: Almost On Track","target":"t4_3: Off Track","value":"0.27","count":27},{"source":"t3_4: Almost On Track","target":"t4_4: Almost On Track","value":"1.26","count":126},{"source":"t3_4: Almost On Track","target":"t4_5: On Track - Local","value":"0.03","count":3},{"source":"t3_4: Almost On Track","target":"t4_6: On Track - Regents","value":"0.37","count":37},{"source":"t3_4: Almost On Track","target":"t4_7: On Track - Adv Regents","value":"0.11","count":11},{"source":"t3_5: On Track - Local","target":"t4_3: Off Track","value":"0.03","count":3},{"source":"t3_5: On Track - Local","target":"t4_4: Almost On Track","value":"0.04","count":4},{"source":"t3_5: On Track - Local","target":"t4_5: On Track - Local","value":"0.16","count":16},{"source":"t3_5: On Track - Local","target":"t4_6: On Track - Regents","value":"0.04","count":4},{"source":"t3_5: On Track - Local","target":"t4_7: On Track - Adv Regents","value":"0.02","count":2},{"source":"t3_6: On Track - Regents","target":"t4_3: Off Track","value":"0.15","count":15},{"source":"t3_6: On Track - Regents","target":"t4_4: Almost On Track","value":"0.46","count":46},{"source":"t3_6: On Track - Regents","target":"t4_5: On Track - Local","value":"0.06","count":6},{"source":"t3_6: On Track - Regents","target":"t4_6: On Track - Regents","value":"2.27","count":227},{"source":"t3_6: On Track - Regents","target":"t4_7: On Track - Adv Regents","value":"0.56","count":56},{"source":"t3_7: On Track - Adv Regents","target":"t4_3: Off Track","value":"0.09","count":9},{"source":"t3_7: On Track - Adv Regents","target":"t4_4: Almost On Track","value":"0.14","count":14},{"source":"t3_7: On Track - Adv Regents","target":"t4_5: On Track - Local","value":"0.05","count":5},{"source":"t3_7: On Track - Adv Regents","target":"t4_6: On Track - Regents","value":"0.31","count":31},{"source":"t3_7: On Track - Adv Regents","target":"t4_7: On Track - Adv Regents","value":"1.21","count":121},{"source":"t4_3: Off Track","target":"t5_3: Off Track","value":"1.46","count":146},{"source":"t4_3: Off Track","target":"t5_4: Almost On Track","value":"0.24","count":24},{"source":"t4_3: Off Track","target":"t5_5: On Track - Local","value":"0.07","count":7},{"source":"t4_3: Off Track","target":"t5_6: On Track - Regents","value":"0.31","count":31},{"source":"t4_3: Off Track","target":"t5_7: On Track - Adv Regents","value":"0.08","count":8},{"source":"t4_4: Almost On Track","target":"t5_3: Off Track","value":"0.28","count":28},{"source":"t4_4: Almost On Track","target":"t5_4: Almost On Track","value":"1.35","count":135},{"source":"t4_4: Almost On Track","target":"t5_5: On Track - Local","value":"0.01","count":1},{"source":"t4_4: Almost On Track","target":"t5_6: On Track - Regents","value":"0.42","count":42},{"source":"t4_4: Almost On Track","target":"t5_7: On Track - Adv Regents","value":"0.1","count":10},{"source":"t4_5: On Track - Local","target":"t5_3: Off Track","value":"0.02","count":2},{"source":"t4_5: On Track - Local","target":"t5_4: Almost On Track","value":"0.04","count":4},{"source":"t4_5: On Track - Local","target":"t5_5: On Track - Local","value":"0.21","count":21},{"source":"t4_5: On Track - Local","target":"t5_6: On Track - Regents","value":"0.03","count":3},{"source":"t4_5: On Track - Local","target":"t5_7: On Track - Adv Regents","value":"0.02","count":2},{"source":"t4_6: On Track - Regents","target":"t5_3: Off Track","value":"0.16","count":16},{"source":"t4_6: On Track - Regents","target":"t5_4: Almost On Track","value":"0.29","count":29},{"source":"t4_6: On Track - Regents","target":"t5_5: On Track - Local","value":"0.05","count":5},{"source":"t4_6: On Track - 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}
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