justmytwospence/sankey.html

## sankey.html
<!DOCTYPE html>
<meta charset="utf-8">
<body>
 <style>
#chart {
height: 500px;
}
.node rect {
cursor: move;
fill-opacity: .9;
shape-rendering: crispEdges;
}
.node text {
font: 12px serif;
pointer-events: none;
text-shadow: 0 1px 0 #fff;
}
.link {
fill: none;
stroke: #000;
stroke-opacity: .2;
}
.link:hover {
stroke-opacity: .5;
}
</style>

<p id="chart"></p>

<script src=http://d3js.org/d3.v3.min.js></script>
 <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);
});
}

// 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((width - 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) {
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;
};
</script>

<script>

 var links = [ { "source" : 0, "target" : 11, "value" : 100 }, { "source" : 0, "target" : 19, "value" : 87 }, { "source" : 1, "target" : 0, "value" : 66 }, { "source" : 2, "target" : 6, "value" : 77 }, { "source" : 3, "target" : 21, "value" : 185 }, { "source" : 3, "target" : 10, "value" : 67 }, { "source" : 3, "target" : 0, "value" : 296 }, { "source" : 4, "target" : 12, "value" : 51 }, { "source" : 4, "target" : 6, "value" : 112 }, { "source" : 5, "target" : 0, "value" : 68 }, { "source" : 6, "target" : 21, "value" : 363 }, { "source" : 6, "target" : 10, "value" : 209 }, { "source" : 6, "target" : 24, "value" : 366 }, { "source" : 7, "target" : 12, "value" : 182 }, { "source" : 7, "target" : 6, "value" : 130 }, { "source" : 8, "target" : 12, "value" : 138 }, { "source" : 8, "target" : 6, "value" : 105 }, { "source" : 9, "target" : 5, "value" : 120 }, { "source" : 9, "target" : 12, "value" : 1550 }, { "source" : 9, "target" : 22, "value" : 111 }, { "source" : 9, "target" : 13, "value" : 130 }, { "source" : 9, "target" : 3, "value" : 612 }, { "source" : 9, "target" : 1, "value" : 128 }, { "source" : 9, "target" : 15, "value" : 698 }, { "source" : 10, "target" : 11, "value" : 86 }, { "source" : 10, "target" : 18, "value" : 63 }, { "source" : 12, "target" : 10, "value" : 93 }, { "source" : 12, "target" : 0, "value" : 411 }, { "source" : 12, "target" : 24, "value" : 210 }, { "source" : 13, "target" : 21, "value" : 58 }, { "source" : 13, "target" : 0, "value" : 122 }, { "source" : 14, "target" : 6, "value" : 105 }, { "source" : 15, "target" : 24, "value" : 95 }, { "source" : 15, "target" : 21, "value" : 74 }, { "source" : 15, "target" : 0, "value" : 251 }, { "source" : 16, "target" : 0, "value" : 106 }, { "source" : 17, "target" : 3, "value" : 98 }, { "source" : 17, "target" : 12, "value" : 127 }, { "source" : 17, "target" : 6, "value" : 841 }, { "source" : 17, "target" : 22, "value" : 218 }, { "source" : 20, "target" : 5, "value" : 80 }, { "source" : 20, "target" : 6, "value" : 1999 }, { "source" : 20, "target" : 13, "value" : 335 }, { "source" : 20, "target" : 1, "value" : 72 }, { "source" : 20, "target" : 3, "value" : 491 }, { "source" : 20, "target" : 15, "value" : 227 }, { "source" : 20, "target" : 16, "value" : 182 }, { "source" : 21, "target" : 18, "value" : 65 }, { "source" : 22, "target" : 10, "value" : 72 }, { "source" : 22, "target" : 0, "value" : 95 }, { "source" : 23, "target" : 15, "value" : 107 }, { "source" : 23, "target" : 12, "value" : 311 }, { "source" : 23, "target" : 6, "value" : 484 }, { "source" : 24, "target" : 18, "value" : 73 } ] ;
 var nodes = [ { "name" : "funny" }, { "name" : "atheism" }, { "name" : "AdviceAnimals" }, { "name" : "WTF" }, { "name" : "atheism" }, { "name" : "gaming" }, { "name" : "funny" }, { "name" : "aww" }, { "name" : "reddit.com" }, { "name" : "funny" }, { "name" : "gifs" }, { "name" : "GifSound" }, { "name" : "pics" }, { "name" : "aww" }, { "name" : "gaming" }, { "name" : "gifs" }, { "name" : "reddit.com" }, { "name" : "gifs" }, { "name" : "funny" }, { "name" : "WTF" }, { "name" : "pics" }, { "name" : "pics" }, { "name" : "GifSound" }, { "name" : "WTF" }, { "name" : "WTF" } ] ;
 var margin = {top: 1, right: 1, bottom: 6, left: 1},
width = 600 - margin.left - margin.right,
height = 500 - margin.top - margin.bottom;

var formatNumber = d3.format(",.0f"),
format = function(d) { return formatNumber(d) + " TWh"; },
color = d3.scale.category20();

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()
.nodes(d3.values(nodes))
.links(links)
.nodeWidth(15)
.nodePadding(10)
.size([width, height])
.layout(32);

var path = sankey.link();

var link = svg.append("g").selectAll(".link")
.data(sankey.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; });

link.append("title")
.text(function(d) { return d.source.name + " → " + d.target.name + "\n" + format(d.value); });

var node = svg.append("g").selectAll(".node")
.data(sankey.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 + "\n" + format(d.value); });

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);
}

</script>

 </body>

## sankey.ipynb

      
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              sankey.ipynb
            
          
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	<!DOCTYPE html>
	<meta charset="utf-8">
	<body>
	<style>
	#chart {
	height: 500px;
	}
	.node rect {
	cursor: move;
	fill-opacity: .9;
	shape-rendering: crispEdges;
	}
	.node text {
	font: 12px serif;
	pointer-events: none;
	text-shadow: 0 1px 0 #fff;
	}
	.link {
	fill: none;
	stroke: #000;
	stroke-opacity: .2;
	}
	.link:hover {
	stroke-opacity: .5;
	}
	</style>

	<p id="chart"></p>

	<script src=http://d3js.org/d3.v3.min.js></script>
	<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);
	});
	}

	// 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((width - 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) {
	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;
	};
	</script>

	<script>

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