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Sankey set node position
Raw
README.md

Sets y-position of selected nodes according to a defined array after sankey.js has calculated their position.

Raw
emissions.json
{
"links": [
{"source":"Coal","target":"Asia","value":"29"},
{"source":"Coal","target":"North America","value":"5"},
{"source":"Coal","target":"Europe","value":"4"},
{"source":"Coal","target":"Middle East","value":"1"},
{"source":"Coal","target":"Latin America - Carribean","value":"1.0"},
{"source":"Coal","target":"Africa","value":"1"},
{"source":"Coal","target":"Oceania","value":"1.4"},
{"source":"Oil","target":"Asia","value":"10"},
{"source":"Oil","target":"North America","value":"6.2"},
{"source":"Oil","target":"Europe","value":"6"},
{"source":"Oil","target":"Middle East","value":"3"},
{"source":"Oil","target":"Latin America - Carribean","value":"2"},
{"source":"Oil","target":"Africa","value":"1"},
{"source":"Oil","target":"Oceania","value":"0.6"},
{"source":"Gas","target":"Asia","value":"4"},
{"source":"Gas","target":"North America","value":"5"},
{"source":"Gas","target":"Europe","value":"6.3"},
{"source":"Gas","target":"Middle East","value":"3"},
{"source":"Gas","target":"Latin America - Carribean","value":"1"},
{"source":"Gas","target":"Africa","value":"1"},
{"source":"Gas","target":"Oceania","value":"0.5"},
{"source":"Cement","target":"Asia","value":"5"},
{"source":"Cement","target":"North America","value":"0.5"},
{"source":"Cement","target":"Europe","value":"1"},
{"source":"Cement","target":"Middle East","value":"0.8"},
{"source":"Cement","target":"Latin America - Carribean","value":"0.5"},
{"source":"Cement","target":"Africa","value":"0.5"},
{"source":"Cement","target":"Oceania","value":"0.5"},
{"source":"Gas Flaring","target":"Asia","value":"0.5"},
{"source":"Gas Flaring","target":"North America","value":"0.5"},
{"source":"Gas Flaring","target":"Europe","value":"0.5"},
{"source":"Gas Flaring","target":"Middle East","value":"0.5"},
{"source":"Gas Flaring","target":"Latin America - Carribean","value":"0.5"},
{"source":"Gas Flaring","target":"Africa","value":"0.5"},
{"source":"Gas Flaring","target":"Oceania","value":"0.5"},
{"source":"Africa","target":"South Africa","value":"2"},
{"source":"Africa","target":"Egypt","value":"1"},
{"source":"Africa","target":"Algeria","value":"1"},
{"source":"Asia","target":"China","value":"12"},
{"source":"Asia","target":"India","value":"7"},
{"source":"Asia","target":"Japan","value":"6"},
{"source":"Asia","target":"South Korea","value":"6"},
{"source":"Asia","target":"Indonesia","value":"5.0"},
{"source":"Asia","target":"Thailand","value":"4"},
{"source":"Asia","target":"Kazakhstan","value":"3"},
{"source":"Asia","target":"Taiwan","value":"2.0"},
{"source":"Asia","target":"Malaysia","value":"1.5"},
{"source":"Asia","target":"Vietnam","value":"1.0"},
{"source":"Asia","target":"Pakistan","value":"0.6"},
{"source":"Asia","target":"Uzbekistan","value":"0.6"},
{"source":"Middle East","target":"Iran","value":"1"},
{"source":"Middle East","target":"Saudi Arabia","value":"3.3"},
{"source":"Middle East","target":"Turkey","value":"1"},
{"source":"Middle East","target":"UAE","value":"1"},
{"source":"Middle East","target":"Iraq","value":"1"},
{"source":"Middle East","target":"Kuwait","value":"1"},
{"source":"Europe","target":"Russian Federation","value":"1.8"},
{"source":"Europe","target":"Germany","value":"1.8"},
{"source":"Europe","target":"United Kingdom","value":"1.8"},
{"source":"Europe","target":"Italy","value":"1.8"},
{"source":"Europe","target":"France","value":"1.8"},
{"source":"Europe","target":"Poland","value":"1.8"},
{"source":"Europe","target":"Ukraine","value":"1.8"},
{"source":"Europe","target":"Spain","value":"1.8"},
{"source":"Europe","target":"Netherlands","value":"1.8"},
{"source":"Europe","target":"Czech Republic","value":"0.3"},
{"source":"North America","target":"United States","value":"10"},
{"source":"North America","target":"Canada","value":"3.5"},
{"source":"North America","target":"Mexico","value":"3.5"},
{"source":"Latin America - Carribean","target":"Brazil","value":"2"},
{"source":"Latin America - Carribean","target":"Venezuela","value":"1"},
{"source":"Latin America - Carribean","target":"Argentina","value":"1"},
{"source":"Oceania","target":"Australia","value":"3.5"}
] ,
"nodes": [
{"name":"Coal"},
{"name":"Oil"},
{"name":"Gas"},
{"name":"Cement"},
{"name":"Gas Flaring"},
{"name":"Asia"},
{"name":"Middle East"},
{"name":"North America"},
{"name":"Europe"},
{"name":"Latin America - Carribean"},
{"name":"Africa"},
{"name":"Oceania"},
{"name":"South Africa"},
{"name":"Egypt"},
{"name":"Algeria"},
{"name":"Canada"},
{"name":"Mexico"},
{"name":"Spain"},
{"name":"Ukraine"},
{"name":"Poland"},
{"name":"France"},
{"name":"Italy"},
{"name":"United Kingdom"},
{"name":"Germany"},
{"name":"Russian Federation"},
{"name":"Netherlands"},
{"name":"UAE"},
{"name":"Turkey"},
{"name":"Saudi Arabia"},
{"name":"Iran"},
{"name":"Kuwait"},
{"name":"Brazil"},
{"name":"Venezuela"},
{"name":"Argentina"},
{"name":"Iraq"},
{"name":"Czech Republic"},
{"name":"China"},
{"name":"India"},
{"name":"Japan"},
{"name":"Indonesia"},
{"name":"Thailand"},
{"name":"South Korea"},
{"name":"Kazakhstan"},
{"name":"Taiwan"},
{"name":"Malaysia"},
{"name":"Vietnam"},
{"name":"Pakistan"},
{"name":"Uzbekistan"},
{"name":"United States"},
{"name":"Australia"}
] }
Raw
index.html
<!DOCTYPE html>
<meta charset="utf-8">
<title>SANKEY Experiment</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 = "Mt CO2";
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"), // zero decimal places
format = function(d) { return formatNumber(d) + " " + units; },
color = d3.scale.category20();
// 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(36)
.nodePadding(10)
.size([width, height]);
var path = sankey.link();
// load the data
d3.json("emissions.json", function(error, graph) {
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
};
});
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 + " → " +
d.target.name + "\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))
.call(function () {
manualLayout();
});
// add the rectangles for the nodes
node.append("rect")
.attr("height", function(d) { return d.dy; })
.attr("width", sankey.nodeWidth())
.style("fill", function(d) {
if (d.name == "Europe" || d.name == "Spain" || d.name == "Ukraine" || d.name == "Poland"
|| d.name == "France" || d.name == "Italy" || d.name == "United Kingdom" || d.name == "Germany"
|| d.name == "Russian Federation" || d.name == "Netherlands" || d.name == "Czech Republic") return "#FF8A4D"
else if (d.name == "North America" || d.name == "United States" || d.name == "Canada"
|| d.name == "Mexico" ) return "#BAFFC9"
else if (d.name == "Asia" || d.name == "China" || d.name == "India" || d.name == "Japan"
|| d.name == "South Korea" || d.name == "Indonesia" || d.name == "Thailand"
|| d.name == "Kazakhstan" || d.name == "Taiwan" || d.name == "Malaysia"
|| d.name == "Vietnam" || d.name == "Pakistan" || d.name == "Uzbekistan" ) return "#FFFEBB"
else if (d.name == "Middle East" || d.name == "Saudi Arabia" || d.name == "UAE"
|| d.name == "Turkey" || d.name == "Iran" || d.name == "Kuwait"
|| d.name == "Iraq" ) return "#F0CF28"
else if (d.name == "Africa" || d.name == "South Africa" || d.name == "Egypt"
|| d.name == "Algeria" ) return "#592062"
else if (d.name == "Latin Am - Carribean" || d.name == "Brazil" || d.name == "Venezuela"
|| d.name == "Argentina") return "#FFB4BB"
else if (d.name == "Oceania" || d.name == "Australia") return "#61E3F1"
else if (d.name == "Coal") return "#3B3131"
else if (d.name == "Oil") return "#886666"
else if (d.name == "Gas Flaring") return "#AEC7E8"
else if (d.name == "Cement") return "#666688"
else if (d.name == "Gas") return "#AEC7E8"
else 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 + "\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; })
.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);
}
// manually customize node position
function manualLayout() {
//http://stackoverflow.com/questions/10337640/how-to-access-the-dom-element-that-correlates-to-a-d3-svg-object
//displacements in order of foo nodes (foo[0][j])
var displacements = [56,299,485,647,766, 55, 746, 307, 490, 612, 677, 429];
var foo = d3.selectAll("g.node");
for (j=0; j < displacements.length; j++) {
pickNode = foo[0][j]; //equals "this" in d3.behavior.drag()...on("dragstart")
d = graph.nodes[j];
d3.select(pickNode).attr("transform",
"translate(" + (
d.x = d.x
) + "," + (
d.y = displacements[j] //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) { //iterations = 32 from .layout(32) in index.html
//var priorities = ['Coal', 'Oil', 'Gas', 'Cement', 'Gas Flaring'];
var nodesByBreadth = d3.nest()
.key(function(d) {
// console.log("d in nodesByBreadth var: ", d)
// console.log("d.x: ", d.x)
return d.x;
//return d.;
})
//.sortKeys(d3.ascending) //orders the keys = d.x (x-coord of columns: 0,1130,565)
.sortKeys(d3.descending) //keys = d.x = 565, 1130, 0
// .sortKeys(function(a,b) {
// return priorities.indexOf(a) - priorities.indexOf(b);
// })
.entries(nodes)
.map(function(d) {
// console.log("iterations: ", iterations)
// console.log("d: ", d)
// console.log("d.values in computeNodeDepths: ", d.values[0])
// if (d.key == "0") {
// console.log("key 0")
// }
return d.values;
});
//
initializeNodeDepth();
resolveCollisions();
for (var alpha = 1; iterations > 0; --iterations) {
relaxRightToLeft(alpha *= .99);
resolveCollisions();
relaxLeftToRight(alpha);
resolveCollisions();
}
function initializeNodeDepth() {
//console.log("nodesByBreadth: ", nodesByBreadth)
// console.log("nodesByBreadth[2][2]: ", nodesByBreadth[2][2])
// console.log("nodesByBreadth[2][3]: ", nodesByBreadth[2][3])
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) {
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;
}
function value(link) {
return link.value;
}
return sankey;
};
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