D3 Examples - Animate line and points

xxxxxxxxxx
 
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html;charset=utf-8"/>
  
  <style>
    path {
      stroke-width: 2px;
      fill: none;
    }
  </style>
​
</head>
<body>
  
  <p>Click the chart to start the animation.</p>
  
  <div id="line"></div>
  <script src="https://d3js.org/d3.v4.min.js"></script>
  <script type="text/javascript">
    
    console.clear()    
    
    var w = 700;
    var h = 300; 
    var m = 40;
    
    var max = 100
    
    var show = false
​
    var svg = d3.select("#line")
      .append("svg")
      .attr("width", w + m + m)
      .attr("height", h + m + m)
        .on('click', transitionLine)
    
    var chart = svg.append("g")
        .attr("transform", "translate(" + m + "," + m + ")")
​
    var data = d3.range(max+1)
    .map(function(){
      return Math.random() * max
    })
​
    var x = d3.scaleLinear()
    .domain([0, max])
    .range([0, w]);
    
    var y = d3.scaleLinear()
    .domain([0, max])
    .range([h, 0]);
    
    var line = d3.line()
      .x(function(d,i) {return x(i);})
      .y(function(d) {return y(d);})
    
    var clipPath = chart.append("clipPath")
        .attr("id", "clip")
        .append("rect")
        .attr("id", "clip-rect")
        .attr("width", 0)
        .attr("height", h)
    
    var bkdPath = chart.append("path")
      .attr("d", line(data))
      .style("stroke", "lightgrey")
    
    var path = chart.append("path")
      .attr("d", line(data))
      .style("stroke", "orange")
        .attr("clip-path", "url(#clip)")
    
    var bkdCircle = chart.selectAll(".bkd-circle")
      .data(data)
        .enter()
        .append("g")
        .attr("transform", function(d, i){
        return "translate(" + x(i) + "," + y(d) + ")"
      })
        .attr("class", "bkd-circle")
            .append("circle")
        .attr("r", 5)
        .style("stroke", "lightgrey")
        .style("fill", "white")
    
    var dataPoint = chart.selectAll('.data-point')
        .data(data)
        .enter()
        .append("g")
        .attr("transform", function(d, i){
        return "translate(" + x(i) + "," + y(d) + ")"
      })
        .attr("class", "data-point")
        .attr("id", (d, i) => "data-point-" + i)
        .style("opacity", 0)
    
    dataPoint.append("circle")
        .attr("r", 5)
    
    dataPoint.append("text")
        .text((d, i) => i + ", " + round2dp(d) )
        .attr("dy", 18)
        
    
    function transitionLine() {
      
      svg.on('click', null)
      
      d3.select('#clip-rect')      
        .transition()
        .duration(10000)
        .ease(d3.easeLinear)
        .attr("width", function(d){
            let n = w
            if (show) {
            show = false
            n = 0
          } else {
            show = true
          }
            return n
        })
        .tween("attr.fill", function() {
​
          return function(t) {
            
            let kx = show ? 
                Math.floor(t * max) : 
                    Math.ceil((1-t) * max)
                        
            let id = "#data-point-" + kx
            
            d3.selectAll(".data-point")
                .style("opacity", 0)
​
            d3.select(id)
                .style("opacity", 1)
          };
        
        })
        .on('end', function(){
            svg.on('click', transitionLine)
        })
      
    }
       
    
    function round2dp(n) {
      return Number.parseFloat(n).toFixed(2);
    }
    
    
    
    
​
    
  </script>
</body>
</html>
    