2f:Teb8,drawChart = function(){ var svg = d3.select("svg") .attr("width", width) .attr("height", height); var sankey = d3.sankey() .nodeWidth(15) .nodePadding(10) .size([width, height]); var formatNumber = d3.format(",.0f"), format = function(d) { return formatNumber(d) + " TWh"; } var path = sankey.link(); var freqCounter = 1; energy.links.forEach(function(d){ d.o_value = d.value; d.value = 1; }) energy.nodes.forEach(function(d,i){ d.color = colors[i%colors.length] }) 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.o_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() .on("drag", function (event,d){ d.x = event.x d.y = event.y d3.select(this).attr("transform", d => `translate(${d.x},${d.y})`); sankey.relayout(); link.attr("d",path);} )); node.append("rect") .attr("height", function(d) {return d.dy;}) .attr("width", sankey.nodeWidth()) .style("fill", function(d,i) {return d.color}) .style("rx", 5) .style("stroke", "none"); var linkExtent = d3.extent(energy.links, function(d) {return d.o_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.o_value); link.particleSize = 2; link.particleColor = d3.scaleLinear().domain([0,1]) .range([link.source.color, link.target.color]) }); var particles = []; function tick(elapsed, time) { //Remove complete particles particles = particles.filter(function(d) {return d.current < d.path.getTotalLength()}); function particleEdgeCanvasPath(elapsed) { var context = d3.select("canvas").node().getContext("2d") context.clearRect(0,0,width,height); context.fillStyle = "gray"; context.lineWidth = "1px"; for (var x in particles) { //Particle Progress: difference between current time, and time of creation var currentTime = elapsed - particles[x].time; //Progress Adjusted for speed? particles[x].current = currentTime * 0.15 * 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(); } }; //Generate particle data d3.selectAll("path.link") .each(function(d) { for (var x=0; x<2; x++) { //Y jitter var offset = (Math.random() - .5) * (d.dy - 4); //Generate particles based on frequency distribution 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())}) } } }) particleEdgeCanvasPath(elapsed) }; var t = d3.timer(tick, 1000); 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