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<html lang="en">
<head>
<meta charset="utf-8" />
<title>Sankey Particles</title>
<style>
.node rect {
cursor: move;
fill-opacity: .75;
shape-rendering: crispEdges;
}
.node text {
pointer-events: none;
text-shadow: 0 1px 0 #000000;
}
.link {
fill: none;
stroke: #000000;
stroke-opacity: .05;
}
.link:hover {
stroke-opacity: .15;
}
svg {
position: absolute;
}
canvas {
position: absolute;
}
</style>
</head>
<body>
<canvas width="1000" height="1000" ></canvas>
<svg width="1000" height="1000" ></svg>
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/4.8.0/d3.js" charset="utf-8" type="text/javascript"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3-sankey/0.4.2/d3-sankey.js" charset="utf-8" type="text/javascript"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3-timer/1.0.5/d3-timer.js" charset="utf-8" type="text/javascript"></script>
<script type="text/javascript">
var margin = {top: 1, right: 1, bottom: 6, left: 1},
width = 960 - margin.left - margin.right,
height = 500 - margin.top - margin.bottom;
var formatNumber = d3.format(",.0f"),
format = function(d) { return formatNumber(d) + " TWh"; },
color = d3.scaleOrdinal(d3.schemeCategory20);
var svg = d3.select("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()
.nodeWidth(15)
.nodePadding(10)
.size([width, height]);
var path = sankey.link();
var freqCounter = 1;
d3.json("energy.json", function(energy) {
sankey
.nodes(energy.nodes)
.links(energy.links)
.layout(32);
var link = svg.append("g").selectAll(".link")
.data(energy.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(energy.nodes)
.enter().append("g")
.attr("class", "node")
.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));
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", "none")
.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);
}
var linkExtent = d3.extent(energy.links, function (d) {return d.value});
var frequencyScale = d3.scaleLinear().domain(linkExtent).range([0.05,1]);
var particleSize = d3.scaleLinear().domain(linkExtent).range([1,5]);
energy.links.forEach(function (link) {
link.freq = frequencyScale(link.value);
link.particleSize = 2;
link.particleColor = d3.scaleLinear().domain([0,1])
.range([link.source.color, link.target.color]);
})
var t = d3.timer(tick, 1000);
var particles = [];
function tick(elapsed, time) {
particles = particles.filter(function (d) {return d.current < d.path.getTotalLength()});
d3.selectAll("path.link")
.each(
function (d) {
// if (d.freq < 1) {
for (var x = 0;x<2;x++) {
var offset = (Math.random() - .5) * (d.dy - 4);
if (Math.random() < d.freq) {
var length = this.getTotalLength();
particles.push({link: d, time: elapsed, offset: offset, path: this, length: length, animateTime: length, speed: 0.5 + (Math.random())})
}
}
// }
/* else {
for (var x = 0; x<d.freq; x++) {
var offset = (Math.random() - .5) * d.dy;
particles.push({link: d, time: elapsed, offset: offset, path: this})
}
} */
});
particleEdgeCanvasPath(elapsed);
}
function particleEdgeCanvasPath(elapsed) {
var context = d3.select("canvas").node().getContext("2d")
context.clearRect(0,0,1000,1000);
context.fillStyle = "gray";
context.lineWidth = "1px";
for (var x in particles) {
var currentTime = elapsed - particles[x].time;
// var currentPercent = currentTime / 1000 * particles[x].path.getTotalLength();
particles[x].current = currentTime * 0.05 * particles[x].speed;
var currentPos = particles[x].path.getPointAtLength(particles[x].current);
context.beginPath();
context.fillStyle = particles[x].link.particleColor(0);
context.arc(currentPos.x,currentPos.y + particles[x].offset,particles[x].link.particleSize,0,2*Math.PI);
context.fill();
}
}
});
</script>
</body>
</html>
https://cdnjs.cloudflare.com/ajax/libs/d3/4.8.0/d3.js
https://cdnjs.cloudflare.com/ajax/libs/d3-sankey/0.4.2/d3-sankey.js
https://cdnjs.cloudflare.com/ajax/libs/d3-timer/1.0.5/d3-timer.js