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d3sparql.js
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d3sparql.js
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//
// d3sparql.js - utilities for visualizing SPARQL results with the D3 library
//
// Web site: http://github.com/ktym/d3sparql/
// Copyright: 2013-2015 (C) Toshiaki Katayama ([email protected])
// License: BSD license (same as D3.js)
// Initial version: 2013-01-28
//
var d3sparql = {
version: "d3sparql.js version 2018-05-04",
debug: false // set to true for showing debug information
}
/*
Execute a SPARQL query and pass the result to a given callback function
Synopsis:
<!DOCTYPE html>
<meta charset="utf-8">
<html>
<head>
<script src="http://d3js.org/d3.v3.min.js"></script>
<script src="d3sparql.js"></script>
<script>
function exec() {
var endpoint = d3.select("#endpoint").property("value")
var sparql = d3.select("#sparql").property("value")
d3sparql.query(endpoint, sparql, render)
}
function render(json) {
// set options and call the d3sparql.xxxxx visualization methods in this library ...
var config = {
"margin": {"top": 10, "right": 10, "bottom": 10, "left": 10},
"selector": "#result",
...
}
d3sparql.xxxxx(json, config)
}
</script>
<style>
<!-- customize CSS -->
</style>
</head>
<body onload="exec()">
<form style="display:none">
<input id="endpoint" value="http://dbpedia.org/sparql" type="text">
<textarea id="sparql">
PREFIX ...
SELECT ...
WHERE { ... }
</textarea>
</form>
<div id="result"></div>
</body>
</html>
*/
d3sparql.fetch = function(url, callback) {
if (d3sparql.debug) { console.log(url) }
var mime = "application/sparql-results+json"
d3.xhr(url, mime, function(request) {
var json = request.responseText
if (d3sparql.debug) { console.log(json) }
callback(JSON.parse(json))
})
/*
// d3.json sometimes fails to retrieve "application/sparql-results+json" as it is designed for "application/json"
d3.json(url, function(error, json) {
if (d3sparql.debug) { console.log(error) }
if (d3sparql.debug) { console.log(json) }
callback(json)
})
*/
}
d3sparql.query = function(endpoint, sparql, callback) {
var url = endpoint + "?query=" + encodeURIComponent(sparql)
if (d3sparql.debug) { console.log(endpoint) }
d3sparql.fetch(url, callback)
}
/*
Convert sparql-results+json object into a JSON graph in the {"nodes": [], "links": []} form.
Suitable for d3.layout.force(), d3.layout.sankey() etc.
Options:
config = {
"key1": "node1", // SPARQL variable name for node1 (optional; default is the 1st variable)
"key2": "node2", // SPARQL variable name for node2 (optional; default is the 2nd varibale)
"label1": "node1label", // SPARQL variable name for the label of node1 (optional; default is the 3rd variable)
"label2": "node2label", // SPARQL variable name for the label of node2 (optional; default is the 4th variable)
"value1": "node1value", // SPARQL variable name for the value of node1 (optional; default is the 5th variable)
"value2": "node2value" // SPARQL variable name for the value of node2 (optional; default is the 6th variable)
}
Synopsis:
d3sparql.query(endpoint, sparql, render)
function render(json) {
var config = { ... }
d3sparql.forcegraph(json, config)
d3sparql.sankey(json, config)
}
TODO:
Should follow the convention in the miserables.json https://gist.github.com/mbostock/4062045 to contain group for nodes and value for edges.
*/
d3sparql.graph = function(json, config) {
config = config || {}
var head = json.head.vars
var data = json.results.bindings
var opts = {
"key1": config.key1 || head[0] || "key1",
"key2": config.key2 || head[1] || "key2",
"label1": config.label1 || head[2] || false,
"label2": config.label2 || head[3] || false,
"value1": config.value1 || head[4] || false,
"value2": config.value2 || head[5] || false,
}
var graph = {
"nodes": [],
"links": []
}
var check = d3.map()
var index = 0
for (var i = 0; i < data.length; i++) {
var key1 = data[i][opts.key1].value
var key2 = data[i][opts.key2].value
var label1 = opts.label1 ? data[i][opts.label1].value : key1
var label2 = opts.label2 ? data[i][opts.label2].value : key2
var value1 = opts.value1 ? data[i][opts.value1].value : false
var value2 = opts.value2 ? data[i][opts.value2].value : false
if (!check.has(key1)) {
graph.nodes.push({"key": key1, "label": label1, "value": value1})
check.set(key1, index)
index++
}
if (!check.has(key2)) {
graph.nodes.push({"key": key2, "label": label2, "value": value2})
check.set(key2, index)
index++
}
graph.links.push({"source": check.get(key1), "target": check.get(key2)})
}
if (d3sparql.debug) { console.log(JSON.stringify(graph)) }
return graph
}
/*
Convert sparql-results+json object into a JSON tree of {"name": name, "value": size, "children": []} format like in the flare.json file.
Suitable for d3.layout.hierarchy() family
* cluster: d3sparql.dendrogram()
* pack: d3sparql.circlepack()
* partition: d3sparql.sunburst()
* tree: d3sparql.roundtree()
* treemap: d3sparql.treemap(), d3sparql.treemapzoom()
Options:
config = {
"root": "root_name", // SPARQL variable name for root node (optional; default is the 1st variable)
"parent": "parent_name", // SPARQL variable name for parent node (optional; default is the 2nd variable)
"child": "child_name", // SPARQL variable name for child node (ptional; default is the 3rd variable)
"value": "value_name" // SPARQL variable name for numerical value of the child node (optional; default is the 4th variable or "value")
}
Synopsis:
d3sparql.sparql(endpoint, sparql, render)
function render(json) {
var config = { ... }
d3sparql.roundtree(json, config)
d3sparql.dendrogram(json, config)
d3sparql.sunburst(json, config)
d3sparql.treemap(json, config)
d3sparql.treemapzoom(json, config)
}
*/
d3sparql.tree = function(json, config) {
config = config || {}
var head = json.head.vars
var data = json.results.bindings
var opts = {
"root": config.root || head[0],
"parent": config.parent || head[1],
"child": config.child || head[2],
"value": config.value || head[3] || "value",
}
var pair = d3.map()
var size = d3.map()
var root = data[0][opts.root].value
var parent = child = children = true
for (var i = 0; i < data.length; i++) {
parent = data[i][opts.parent].value
child = data[i][opts.child].value
if (parent != child) {
if (pair.has(parent)) {
children = pair.get(parent)
children.push(child)
} else {
children = [child]
}
pair.set(parent, children)
if (data[i][opts.value]) {
size.set(child, data[i][opts.value].value)
}
}
}
function traverse(node) {
var list = pair.get(node)
if (list) {
var children = list.map(function(d) { return traverse(d) })
// sum of values of children
var subtotal = d3.sum(children, function(d) { return d.value })
// add a value of parent if exists
var total = d3.sum([subtotal, size.get(node)])
return {"name": node, "children": children, "value": total}
} else {
return {"name": node, "value": size.get(node) || 1}
}
}
var tree = traverse(root)
if (d3sparql.debug) { console.log(JSON.stringify(tree)) }
return tree
}
/*
Rendering sparql-results+json object containing multiple rows into a HTML table
Options:
config = {
"selector": "#result"
}
Synopsis:
d3sparql.query(endpoint, sparql, render)
function render(json) {
var config = { ... }
d3sparql.htmltable(json, config)
}
CSS:
<style>
table {
margin: 10px;
}
th {
background: #eeeeee;
}
th:first-letter {
text-transform: capitalize;
}
</style>
*/
d3sparql.htmltable = function(json, config) {
config = config || {}
var head = json.head.vars
var data = json.results.bindings
var opts = {
"selector": config.selector || null
}
var table = d3sparql.select(opts.selector, "htmltable").append("table").attr("class", "table table-bordered")
var thead = table.append("thead")
var tbody = table.append("tbody")
thead.append("tr")
.selectAll("th")
.data(head)
.enter()
.append("th")
.text(function(col) { return col })
var rows = tbody.selectAll("tr")
.data(data)
.enter()
.append("tr")
var cells = rows.selectAll("td")
.data(function(row) {
return head.map(function(col) {
return row[col] ? row[col].value : ""
})
})
.enter()
.append("td")
.text(function(val) { return val })
// default CSS
table.style({
"margin": "10px"
})
table.selectAll("th").style({
"background": "#eeeeee",
"text-transform": "capitalize",
})
}
/*
Rendering sparql-results+json object containing one row into a HTML table
Options:
config = {
"selector": "#result"
}
Synopsis:
d3sparql.query(endpoint, sparql, render)
function render(json) {
var config = { ... }
d3sparql.htmlhash(json, config)
}
CSS:
<style>
table {
margin: 10px;
}
th {
background: #eeeeee;
}
th:first-letter {
text-transform: capitalize;
}
</style>
*/
d3sparql.htmlhash = function(json, config) {
config = config || {}
var head = json.head.vars
var data = json.results.bindings[0]
var opts = {
"selector": config.selector || null
}
var table = d3sparql.select(opts.selector, "htmlhash").append("table").attr("class", "table table-bordered")
var tbody = table.append("tbody")
var row = tbody.selectAll("tr")
.data(function() {
return head.map(function(col) {
return {"head": col, "data": data[col] ? data[col].value : ""}
})
})
.enter()
.append("tr")
row.append("th")
.text(function(d) { return d.head })
row.append("td")
.text(function(d) { return d.data })
// default CSS
table.style({
"margin": "10px"
})
table.selectAll("th").style({
"background": "#eeeeee",
"text-transform": "capitalize",
})
}
/*
Rendering sparql-results+json object into a bar chart
References:
http://bl.ocks.org/mbostock/3885304
http://bl.ocks.org/mbostock/4403522
Options:
config = {
"label_x": "Prefecture", // label for x-axis (optional; default is same as var_x)
"label_y": "Area", // label for y-axis (optional; default is same as var_y)
"var_x": "pref", // SPARQL variable name for x-axis (optional; default is the 1st variable)
"var_y": "area", // SPARQL variable name for y-axis (optional; default is the 2nd variable)
"width": 850, // canvas width (optional)
"height": 300, // canvas height (optional)
"margin": 40, // canvas margin (optional)
"selector": "#result"
}
Synopsis:
d3sparql.query(endpoint, sparql, render)
function render(json) {
var config = { ... }
d3sparql.barchart(json, config)
}
CSS/SVG:
<style>
.bar {
fill: steelblue;
}
.bar:hover {
fill: brown;
}
.axis {
font: 10px sans-serif;
}
.axis path,
.axis line {
fill: none;
stroke: #000000;
shape-rendering: crispEdges;
}
.x.axis path {
display: none;
}
</style>
*/
d3sparql.barchart = function(json, config) {
config = config || {}
var head = json.head.vars
var data = json.results.bindings
var opts = {
"label_x": config.label_x || head[0],
"label_y": config.label_y || head[1],
"var_x": config.var_x || head[0],
"var_y": config.var_y || head[1],
"width": config.width || 750,
"height": config.height || 300,
"margin": config.margin || 80, // TODO: to make use of {top: 10, right: 10, bottom: 80, left: 80}
"selector": config.selector || null
}
var scale_x = d3.scale.ordinal().rangeRoundBands([0, opts.width - opts.margin], 0.1)
var scale_y = d3.scale.linear().range([opts.height - opts.margin, 0])
var axis_x = d3.svg.axis().scale(scale_x).orient("bottom")
var axis_y = d3.svg.axis().scale(scale_y).orient("left") // .ticks(10, "%")
scale_x.domain(data.map(function(d) { return d[opts.var_x].value }))
scale_y.domain(d3.extent(data, function(d) { return parseInt(d[opts.var_y].value) }))
var svg = d3sparql.select(opts.selector, "barchart").append("svg")
.attr("width", opts.width)
.attr("height", opts.height)
// .append("g")
// .attr("transform", "translate(" + opts.margin + "," + 0 + ")")
var ax = svg.append("g")
.attr("class", "axis x")
.attr("transform", "translate(" + opts.margin + "," + (opts.height - opts.margin) + ")")
.call(axis_x)
var ay = svg.append("g")
.attr("class", "axis y")
.attr("transform", "translate(" + opts.margin + ",0)")
.call(axis_y)
var bar = svg.selectAll(".bar")
.data(data)
.enter()
.append("rect")
.attr("transform", "translate(" + opts.margin + "," + 0 + ")")
.attr("class", "bar")
.attr("x", function(d) { return scale_x(d[opts.var_x].value) })
.attr("width", scale_x.rangeBand())
.attr("y", function(d) { return scale_y(d[opts.var_y].value) })
.attr("height", function(d) { return opts.height - scale_y(parseInt(d[opts.var_y].value)) - opts.margin })
/*
.call(function(e) {
e.each(function(d) {
console.log(parseInt(d[opts.var_y].value))
})
})
*/
ax.selectAll("text")
.attr("dy", ".35em")
.attr("x", 10)
.attr("y", 0)
.attr("transform", "rotate(90)")
.style("text-anchor", "start")
ax.append("text")
.attr("class", "label")
.text(opts.label_x)
.style("text-anchor", "middle")
.attr("transform", "translate(" + ((opts.width - opts.margin) / 2) + "," + (opts.margin - 5) + ")")
ay.append("text")
.attr("class", "label")
.text(opts.label_y)
.style("text-anchor", "middle")
.attr("transform", "rotate(-90)")
.attr("x", 0 - (opts.height / 2))
.attr("y", 0 - (opts.margin - 20))
// default CSS/SVG
bar.attr({
"fill": "steelblue",
})
svg.selectAll(".axis").attr({
"stroke": "black",
"fill": "none",
"shape-rendering": "crispEdges",
})
svg.selectAll("text").attr({
"stroke": "none",
"fill": "black",
"font-size": "8pt",
"font-family": "sans-serif",
})
}
/*
Rendering sparql-results+json object into a pie chart
References:
http://bl.ocks.org/mbostock/3887235 Pie chart
http://bl.ocks.org/mbostock/3887193 Donut chart
Options:
config = {
"label": "pref", // SPARQL variable name for slice label (optional; default is the 1st variable)
"size": "area", // SPARQL variable name for slice value (optional; default is the 2nd variable)
"width": 700, // canvas width (optional)
"height": 600, // canvas height (optional)
"margin": 10, // canvas margin (optional)
"hole": 50, // radius size of a center hole (optional; 0 for pie, r > 0 for doughnut)
"selector": "#result"
}
Synopsis:
d3sparql.query(endpoint, sparql, render)
function render(json) {
var config = { ... }
d3sparql.piechart(json, config)
}
CSS/SVG:
<style>
.label {
font: 10px sans-serif;
}
.arc path {
stroke: #ffffff;
}
</style>
*/
d3sparql.piechart = function(json, config) {
config = config || {}
var head = json.head.vars
var data = json.results.bindings
var opts = {
"label": config.label || head[0],
"size": config.size || head[1],
"width": config.width || 700,
"height": config.height || 700,
"margin": config.margin || 10,
"hole": config.hole || 100,
"selector": config.selector || null
}
var radius = Math.min(opts.width, opts.height) / 2 - opts.margin
var hole = Math.max(Math.min(radius - 50, opts.hole), 0)
var color = d3.scale.category20()
var arc = d3.svg.arc()
.outerRadius(radius)
.innerRadius(hole)
var pie = d3.layout.pie()
//.sort(null)
.value(function(d) { return d[opts.size].value })
var svg = d3sparql.select(opts.selector, "piechart").append("svg")
.attr("width", opts.width)
.attr("height", opts.height)
.append("g")
.attr("transform", "translate(" + opts.width / 2 + "," + opts.height / 2 + ")")
var g = svg.selectAll(".arc")
.data(pie(data))
.enter()
.append("g")
.attr("class", "arc")
var slice = g.append("path")
.attr("d", arc)
.attr("fill", function(d, i) { return color(i) })
var text = g.append("text")
.attr("class", "label")
.attr("transform", function(d) { return "translate(" + arc.centroid(d) + ")" })
.attr("dy", ".35em")
.attr("text-anchor", "middle")
.text(function(d) { return d.data[opts.label].value })
// default CSS/SVG
slice.attr({
"stroke": "#ffffff",
})
// TODO: not working?
svg.selectAll("text").attr({
"stroke": "none",
"fill": "black",
"font-size": "20px",
"font-family": "sans-serif",
})
}
/*
Rendering sparql-results+json object into a scatter plot
References:
http://bl.ocks.org/mbostock/3244058
Options:
config = {
"label_x": "Size", // label for x-axis (optional; default is same as var_x)
"label_y": "Count", // label for y-axis (optional; default is same as var_y)
"var_x": "size", // SPARQL variable name for x-axis values (optional; default is the 1st variable)
"var_y": "count", // SPARQL variable name for y-axis values (optional; default is the 2nd variable)
"var_r": "volume", // SPARQL variable name for radius (optional; default is the 3rd variable)
"min_r": 1, // minimum radius size (optional; default is 1)
"max_r": 20, // maximum radius size (optional; default is 20)
"width": 850, // canvas width (optional)
"height": 300, // canvas height (optional)
"margin_x": 80, // canvas margin x (optional)
"margin_y": 40, // canvas margin y (optional)
"selector": "#result"
}
Synopsis:
d3sparql.query(endpoint, sparql, render)
function render(json) {
var config = { ... }
d3sparql.scatterplot(json, config)
}
CSS/SVG:
<style>
.label {
font-size: 10pt;
}
.node circle {
stroke: black;
stroke-width: 1px;
fill: pink;
opacity: 0.5;
}
</style>
*/
d3sparql.scatterplot = function(json, config) {
config = config || {}
var head = json.head.vars
var data = json.results.bindings
var opts = {
"label_x": config.label_x || head[0] || "x",
"label_y": config.label_y || head[1] || "y",
"label_r": config.label_r || head[2] || "r",
"var_x": config.var_x || head[0],
"var_y": config.var_y || head[1],
"var_r": config.var_r || head[2] || 5,
"min_r": config.min_r || 1,
"max_r": config.max_r || 20,
"width": config.width || 850,
"height": config.height || 300,
"margin_x": config.margin_x || 80,
"margin_y": config.margin_y || 40,
"selector": config.selector || null
}
var extent_x = d3.extent(data, function(d) { return parseInt(d[opts.var_x].value) })
var extent_y = d3.extent(data, function(d) { return parseInt(d[opts.var_y].value) })
var extent_r = d3.extent(data, function(d) { return parseInt(d[opts.var_r] ? d[opts.var_r].value : opts.var_r) })
var scale_x = d3.scale.linear().range([opts.margin_x, opts.width - opts.margin_x]).domain(extent_x)
var scale_y = d3.scale.linear().range([opts.height - opts.margin_y, opts.margin_y]).domain(extent_y)
var scale_r = d3.scale.linear().range([opts.min_r, opts.max_r]).domain(extent_r)
var axis_x = d3.svg.axis().scale(scale_x)
var axis_y = d3.svg.axis().scale(scale_y).orient("left")
var svg = d3sparql.select(opts.selector, "scatterplot").append("svg")
.attr("width", opts.width)
.attr("height", opts.height)
var circle = svg.selectAll("circle")
.data(data)
.enter()
.append("circle")
.attr("class", "node")
.attr("cx", function(d) { return scale_x(d[opts.var_x].value) })
.attr("cy", function(d) { return scale_y(d[opts.var_y].value) })
.attr("r", function(d) { return scale_r(d[opts.var_r] ? d[opts.var_r].value : opts.var_r) })
.attr("opacity", 0.5)
.append("title")
.text(function(d) { return d[opts.label_r] ? d[opts.label_r].value : opts.label_r })
var ax = svg.append("g")
.attr("class", "x axis")
.attr("transform", "translate(0," + (opts.height - opts.margin_y) + ")")
.call(axis_x)
var ay = svg.append("g")
.attr("class", "y axis")
.attr("transform", "translate(" + opts.margin_x + ",0)")
.call(axis_y)
ax.append("text")
.attr("class", "label")
.text(opts.label_x)
.style("text-anchor", "middle")
.attr("transform", "translate(" + ((opts.width - opts.margin_x) / 2) + "," + (opts.margin_y - 5) + ")")
ay.append("text")
.attr("class", "label")
.text(opts.label_y)
.style("text-anchor", "middle")
.attr("transform", "rotate(-90)")
.attr("x", 0 - (opts.height / 2))
.attr("y", 0 - (opts.margin_x - 20))
// default CSS/SVG
ax.attr({
"stroke": "black",
"fill": "none",
})
ay.attr({
"stroke": "black",
"fill": "none",
})
// This doesn't work with .append("circle") with .append("title") for tooltip
circle.attr({
"stroke": "gray",
"stroke-width": "1px",
"fill": "lightblue",
"opacity": 0.5,
})
//svg.selectAll(".label").attr({
svg.selectAll("text").attr({
"stroke": "none",
"fill": "black",
"font-size": "8pt",
"font-family": "sans-serif",
})
}
/*
Rendering sparql-results+json object into a force graph
References:
http://bl.ocks.org/mbostock/4062045
Options:
config = {
"radius": 12, // static value or a function to calculate radius of nodes (optional)
"charge": -250, // force between nodes (optional; negative: repulsion, positive: attraction)
"distance": 30, // target distance between linked nodes (optional)
"width": 1000, // canvas width (optional)
"height": 500, // canvas height (optional)
"label": "name", // SPARQL variable name for node labels (optional)
"selector": "#result"
// options for d3sparql.graph() can be added here ...
}
Synopsis:
d3sparql.query(endpoint, sparql, render)
function render(json) {
var config = { ... }
d3sparql.forcegraph(json, config)
}
CSS/SVG:
<style>
.link {
stroke: #999999;
}
.node {
stroke: black;
opacity: 0.5;
}
circle.node {
stroke-width: 1px;
fill: lightblue;
}
text.node {
font-family: "sans-serif";
font-size: 8px;
}
</style>
TODO:
Try other d3.layout.force options.
*/
d3sparql.forcegraph = function(json, config) {
config = config || {}
var graph = (json.head && json.results) ? d3sparql.graph(json, config) : json
var scale = d3.scale.linear()
.domain(d3.extent(graph.nodes, function(d) { return parseFloat(d.value) }))
.range([1, 20])
var opts = {
"radius": config.radius || function(d) { return d.value ? scale(d.value) : 1 + d.label.length },
"charge": config.charge || -500,
"distance": config.distance || 50,
"width": config.width || 1000,
"height": config.height || 750,
"label": config.label || false,
"selector": config.selector || null
}
var svg = d3sparql.select(opts.selector, "forcegraph").append("svg")
.attr("width", opts.width)
.attr("height", opts.height)
var link = svg.selectAll(".link")
.data(graph.links)
.enter()
.append("line")
.attr("class", "link")
var node = svg.selectAll(".node")
.data(graph.nodes)
.enter()
.append("g")
var circle = node.append("circle")
.attr("class", "node")
.attr("r", opts.radius)
var text = node.append("text")
.text(function(d) { return d[opts.label || "label"] })
.attr("class", "node")
var force = d3.layout.force()
.charge(opts.charge)
.linkDistance(opts.distance)
.size([opts.width, opts.height])
.nodes(graph.nodes)
.links(graph.links)
.start()
force.on("tick", function() {
link.attr("x1", function(d) { return d.source.x })
.attr("y1", function(d) { return d.source.y })
.attr("x2", function(d) { return d.target.x })
.attr("y2", function(d) { return d.target.y })
text.attr("x", function(d) { return d.x })
.attr("y", function(d) { return d.y })
circle.attr("cx", function(d) { return d.x })
.attr("cy", function(d) { return d.y })
})
node.call(force.drag)
// default CSS/SVG
link.attr({
"stroke": "#999999",
})
circle.attr({
"stroke": "black",
"stroke-width": "1px",
"fill": "lightblue",
"opacity": 1,
})
text.attr({
"font-size": "8px",
"font-family": "sans-serif",
})
}
/*
Rendering sparql-results+json object into a sanky graph
References:
https://github.com/d3/d3-plugins/tree/master/sankey
http://bost.ocks.org/mike/sankey/
Options:
config = {
"width": 1000, // canvas width (optional)
"height": 900, // canvas height (optional)
"margin": 50, // canvas margin (optional)
"selector": "#result"
// options for d3sparql.graph() can be added here ...
}
Synopsis:
d3sparql.query(endpoint, sparql, render)
function render(json) {
var config = { ... }
d3sparql.sankey(json, config)
}
CSS/SVG:
<style>
.node rect {
cursor: move;
fill-opacity: .9;
shape-rendering: crispEdges;
}
.node text {
pointer-events: none;
text-shadow: 0 1px 0 #ffffff;
}
.link {
fill: none;
stroke: #000000;
stroke-opacity: .2;
}
.link:hover {
stroke-opacity: .5;
}
</style>
Dependencies:
* sankey.js
* Download from https://github.com/d3/d3-plugins/tree/master/sankey
* Put <script src="sankey.js"></script> in the HTML <head> section
*/
d3sparql.sankey = function(json, config) {
config = config || {}
var graph = (json.head && json.results) ? d3sparql.graph(json, config) : json
var opts = {
"width": config.width || 750,
"height": config.height || 1200,
"margin": config.margin || 10,
"selector": config.selector || null
}
var nodes = graph.nodes
var links = graph.links
for (var i = 0; i < links.length; i++) {
links[i].value = 2 // TODO: fix to use values on links
}
var sankey = d3.sankey()
.size([opts.width, opts.height])
.nodeWidth(15)
.nodePadding(10)
.nodes(nodes)
.links(links)
.layout(32)
var path = sankey.link()
var color = d3.scale.category20()
var svg = d3sparql.select(opts.selector, "sankey").append("svg")
.attr("width", opts.width + opts.margin * 2)
.attr("height", opts.height + opts.margin * 2)
.append("g")
.attr("transform", "translate(" + opts.margin + "," + opts.margin + ")")
var link = svg.selectAll(".link")
.data(links)
.enter()
.append("path")
.attr("class", "link")
.attr("d", path)
.attr("stroke-width", function(d) { return Math.max(1, d.dy) })
.sort(function(a, b) { return b.dy - a.dy })
var node = svg.selectAll(".node")
.data(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("width", function(d) { return d.dx })
.attr("height", function(d) { return d.dy })
.attr("fill", function(d) { return color(d.label) })
.attr("opacity", 0.5)
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.label })
.filter(function(d) { return d.x < opts.width / 2 })
.attr("x", 6 + sankey.nodeWidth())
.attr("text-anchor", "start")
// default CSS/SVG
link.attr({
"fill": "none",
"stroke": "grey",
"opacity": 0.5,
})
function dragmove(d) {
d3.select(this).attr("transform", "translate(" + d.x + "," + (d.y = Math.max(0, Math.min(opts.height - d.dy, d3.event.y))) + ")")
sankey.relayout()
link.attr("d", path)
}
}
/*
Rendering sparql-results+json object into a round tree
References:
http://bl.ocks.org/4063550 Reingold-Tilford Tree
Options:
config = {