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yanhann10/.block

Last active December 23, 2019 21:25
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sankey
Raw
.block
license: mit
Raw
README.md
Raw
index.html
<!-- based on wboykinm's https://blockbuilder.org/wboykinm/a12244e3edc8570d60595ff90f885e71 -->
<!DOCTYPE html>
<html class="no-js">
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<script src="https://d3js.org/d3.v4.min.js"></script>
<script src="https://unpkg.com/d3-array@1"></script>
<script src="https://unpkg.com/d3-collection@1"></script>
<script src="https://unpkg.com/d3-path@1"></script>
<script src="https://unpkg.com/d3-shape@1"></script>
<script src="https://unpkg.com/d3-sankey@0"></script>
<script src="sankey.js"></script>
<title>d3 in action</title>
<meta name="description" content="">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="">
</head>
<body>
<script>
var margin = {
top: 70,
right: 10,
bottom: 10,
left: 100
},
width = 700 - margin.left - margin.right,
height = 350 - margin.top - margin.bottom;
// format variables
var formatNumber = d3.format(",.0f"), // zero decimal places
format = function (d) {
return formatNumber(d) + " " + units;
}
var color = d3.scaleOrdinal(d3.schemeCategory20);
// append the svg object to the body of the page
var svg = d3.select("body").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(16)
.nodePadding(20)
.size([width, height]);
d3.json("sankey.json", function (error, data) {
console.log(data)
sankey
.nodes(data.nodes)
.links(data.links)
.layout(50)
var intensityRamp = d3.scaleLinear()
.domain([0, d3.max(data.links, d => d.value)])
.range(["#d3d3d3", "#5E1214"])
d3.select("svg").append("g")
.attr("transform", "translate(20,20)").attr("id", "sankeyG");
d3.select("#sankeyG").selectAll(".link")
.data(data.links)
.enter().append("path")
.attr("class", "link")
.attr("d", sankey.link())
.style("stroke-width", d => d.dy)
.style("stroke-opacity", .5)
.style("fill", "none")
.style("stroke", d => intensityRamp(d.value))
.sort((a, b) => b.dy - a.dy)
.on("mouseover", function () {
d3.select(this).style("stroke-opacity", .8);
})
.on("mouseout", () => {
d3.selectAll("path.link").style("stroke-opacity", .5);
})
d3.select("#sankeyG").selectAll(".node")
.data(data.nodes)
.enter().append("g")
.attr("class", "node")
.attr("transform", d => `translate(${d.x},${d.y})`)
d3.selectAll(".node").append("rect")
.attr("height", d => d.dy)
.attr("width", 20)
.style("fill", function (d) {
return d.color = color(d.name);
})
.style("stroke", null)
d3.selectAll(".node").append("text")
.attr("x", 0)
.attr("y", d => d.dy / 2)
.attr("text-anchor", "middle")
.style("fill", "black")
.text(d => d.name)
})
</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 = 0.5;
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) {
if (nextNodes.indexOf(link.target) < 0) {
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 *= 0.99));
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;
};
Raw
sankey.json
{
"nodes":[
{"node":0,"name":"Online"},
{"node":1,"name":"Walk-in"},
{"node":2,"name":"Lease"},
{"node":3,"name":"Loss"}
],
"links":[
{"source":0,"target":2,"value":2},
{"source":0,"target":3,"value":8},
{"source":1,"target":2,"value":1},
{"source":1,"target":3,"value":2}
]
}
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