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Visualising electorate and party vote flows
Raw
.block
license: mit
Raw
index.html
<!DOCTYPE html>
<html lang="eng">
<head>
<meta charset="UTF-8">
<title>Split votes — all electorates</title>
<script src="https://d3js.org/d3.v4.min.js"></script>
<script src="sankey.js"></script>
<style>
body {
font-family: Helvetic, Arial, Sans-Serif;
color: #333;
}
div.container {
margin-top: 10px;
}
.axis path,
.axis line {
fill: none;
stroke: #000;
shape-rendering: crispEdges;
}
</style>
</head>
<body>
<div class="container">
<div id="chart" style="text-align:center"></div>
</div>
<script src="script.js" type="text/javascript"></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) {
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 *= .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
script.js
var SRC_FILE = "split-votes-all.json",
units = "votes",
sankey_iterations = 0,
vote_threshold=1000;//100000
// set the dimensions and margins of the graph
var margin = {top: 10, right: 10, bottom: 10, left: 10},
width = 600 - margin.left - margin.right,
height = 900 - margin.top - margin.bottom;
// format variables
var formatNumber = d3.format(",.0f"), // zero decimal places
format = function(d) { return formatNumber(d) + " " + units; }
function label(s) {
return s.substring(1, s.length)
}
function color(k) {
vals = {
'ACT New Zealand':'#fdb92d',
'National Party':'#2e95b6',
'New Zealand First Party':'#3d3f43',
'The Opportunities Party (TOP)':'#2A2E71',
'Other':'#cdcdcd',// '#426B6A',
'Māori Party':'#7d584a',
'MANA':'#000',
'Labour Party':'#f15c4c',
'Green Party':'#61bf84',
'Party Vote Only':'#fff'
}
return vals[label(k)]
}
// append the svg object to the body of 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(40)
.size([width, height]);
var path = sankey.link();
d3.json(SRC_FILE, function(error, graph) {
//console.log(graph)
sankey
.nodes(graph.nodes)
.links(graph.links)
//.layout(0);// no iterations to arrange
.layout(sankey_iterations);
// 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); })
.style("fill", "none")
.style("stroke-opacity", function(d) {
if (d.value < vote_threshold) {return 0}
return 0.42;
})
//.style("stroke", "#000")
.style("stroke", function(d) {
//console.log(d)
//return 'steelblue'
return color(d.target.name)
//return d.color = color(d.group.replace(/ .*/, ""));
//return d.color = color(d.name.replace(/ .*/, ""));
})
.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("font-family", "sans-serif")
.attr("font-size", 10)
.attr("transform", function(d) {
return "translate(" + d.x + "," + d.y + ")"; })
.call(d3.drag()
.subject(function(d) {
return d;
})
.on("start", 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 'steelblue'
return color(d.name)
//return d.color = color(d.group.replace(/ .*/, ""));
//return d.color = color(d.name.replace(/ .*/, ""));
})
.style("stroke", function(d) {
return d3.rgb(color(d.name)).darker(1);
})
.append("title")
.text(function(d) {
return label(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 label(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 + ","
+ (d.y = Math.max(
0, Math.min(height - d.dy, d3.event.y))
) + ")");
sankey.relayout();
link.attr("d", path);
}
});
Raw
split-votes-all.json
{
"links": [
{
"source": 0,
"target": 1,
"value": 2448
},
{
"source": 8,
"target": 1,
"value": 443
},
{
"source": 14,
"target": 1,
"value": 333
},
{
"source": 12,
"target": 1,
"value": 1120
},
{
"source": 10,
"target": 1,
"value": 116
},
{
"source": 2,
"target": 1,
"value": 7852
},
{
"source": 6,
"target": 1,
"value": 456
},
{
"source": 4,
"target": 1,
"value": 145
},
{
"source": 16,
"target": 1,
"value": 152
},
{
"source": 0,
"target": 9,
"value": 345
},
{
"source": 8,
"target": 9,
"value": 11846
},
{
"source": 14,
"target": 9,
"value": 3492
},
{
"source": 12,
"target": 9,
"value": 8612
},
{
"source": 10,
"target": 9,
"value": 1748
},
{
"source": 2,
"target": 9,
"value": 7301
},
{
"source": 6,
"target": 9,
"value": 3095
},
{
"source": 4,
"target": 9,
"value": 370
},
{
"source": 16,
"target": 9,
"value": 1275
},
{
"source": 0,
"target": 15,
"value": 406
},
{
"source": 8,
"target": 15,
"value": 3503
},
{
"source": 14,
"target": 15,
"value": 54223
},
{
"source": 12,
"target": 15,
"value": 84470
},
{
"source": 10,
"target": 15,
"value": 2079
},
{
"source": 2,
"target": 15,
"value": 10412
},
{
"source": 6,
"target": 15,
"value": 2063
},
{
"source": 4,
"target": 15,
"value": 2631
},
{
"source": 16,
"target": 15,
"value": 2631
},
{
"source": 0,
"target": 13,
"value": 2007
},
{
"source": 8,
"target": 13,
"value": 21412
},
{
"source": 14,
"target": 13,
"value": 79745
},
{
"source": 12,
"target": 13,
"value": 736835
},
{
"source": 10,
"target": 13,
"value": 19123
},
{
"source": 2,
"target": 13,
"value": 41785
},
{
"source": 6,
"target": 13,
"value": 27251
},
{
"source": 4,
"target": 13,
"value": 6023
},
{
"source": 16,
"target": 13,
"value": 22183
},
{
"source": 0,
"target": 11,
"value": 70
},
{
"source": 8,
"target": 11,
"value": 1713
},
{
"source": 14,
"target": 11,
"value": 1978
},
{
"source": 12,
"target": 11,
"value": 6018
},
{
"source": 10,
"target": 11,
"value": 16375
},
{
"source": 2,
"target": 11,
"value": 2513
},
{
"source": 6,
"target": 11,
"value": 550
},
{
"source": 4,
"target": 11,
"value": 207
},
{
"source": 16,
"target": 11,
"value": 1137
},
{
"source": 0,
"target": 3,
"value": 18548
},
{
"source": 8,
"target": 3,
"value": 19696
},
{
"source": 14,
"target": 3,
"value": 19124
},
{
"source": 12,
"target": 3,
"value": 56566
},
{
"source": 10,
"target": 3,
"value": 7373
},
{
"source": 2,
"target": 3,
"value": 989286
},
{
"source": 6,
"target": 3,
"value": 25806
},
{
"source": 4,
"target": 3,
"value": 4608
},
{
"source": 16,
"target": 3,
"value": 11175
},
{
"source": 0,
"target": 7,
"value": 952
},
{
"source": 8,
"target": 7,
"value": 8640
},
{
"source": 14,
"target": 7,
"value": 6385
},
{
"source": 12,
"target": 7,
"value": 44604
},
{
"source": 10,
"target": 7,
"value": 4480
},
{
"source": 2,
"target": 7,
"value": 41392
},
{
"source": 6,
"target": 7,
"value": 76437
},
{
"source": 4,
"target": 7,
"value": 1026
},
{
"source": 16,
"target": 7,
"value": 2781
},
{
"source": 0,
"target": 5,
"value": 676
},
{
"source": 8,
"target": 5,
"value": 2932
},
{
"source": 14,
"target": 5,
"value": 9406
},
{
"source": 12,
"target": 5,
"value": 19851
},
{
"source": 10,
"target": 5,
"value": 1942
},
{
"source": 2,
"target": 5,
"value": 13841
},
{
"source": 6,
"target": 5,
"value": 2233
},
{
"source": 4,
"target": 5,
"value": 11058
},
{
"source": 16,
"target": 5,
"value": 1309
}
],
"nodes": [
{
"name": "eACT New Zealand",
"node": 0
},
{
"name": "pACT New Zealand",
"node": 1
},
{
"name": "eNational Party",
"node": 2
},
{
"name": "pNational Party",
"node": 3
},
{
"name": "eThe Opportunities Party (TOP)",
"node": 4
},
{
"name": "pThe Opportunities Party (TOP)",
"node": 5
},
{
"name": "eNew Zealand First Party",
"node": 6
},
{
"name": "pNew Zealand First Party",
"node": 7
},
{
"name": "eOther",
"node": 8
},
{
"name": "pOther",
"node": 9
},
{
"name": "eM\u0101ori Party",
"node": 10
},
{
"name": "pM\u0101ori Party",
"node": 11
},
{
"name": "eLabour Party",
"node": 12
},
{
"name": "pLabour Party",
"node": 13
},
{
"name": "eGreen Party",
"node": 14
},
{
"name": "pGreen Party",
"node": 15
},
{
"name": "eParty Vote Only",
"node": 16
}
]
}
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