Scatterplot with animation at loading




This example illustrates how to make data points appear progressively on a chart. It uses a scatterplot as an example. See more about interactivity and scatterplots.


Scatterplot section

Steps:

  • Follows the previous basic scatterplot.

  • Show how to update an axis and data points.

  • For data points, note that a different delay is applied to each circle. This is possible thanks to the expression function(d,i) where i is the id of the datapoint.

  • See more on interactivity and animation.
<!DOCTYPE html>
<meta charset="utf-8">

<!-- Load d3.js -->
<script src="https://d3js.org/d3.v4.js"></script>

<!-- Create a div where the graph will take place -->
<div id="my_dataviz"></div>


<script>

// set the dimensions and margins of the graph
var margin = {top: 10, right: 30, bottom: 30, left: 60},
    width = 460 - margin.left - margin.right,
    height = 400 - margin.top - margin.bottom;
    // append the svg object to the body of the page
    var svg = d3.select("#my_dataviz")
      .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 + ")")

//Read the data
d3.csv("https://raw.githubusercontent.com/holtzy/data_to_viz/master/Example_dataset/2_TwoNum.csv", function(data) {

  // Add X axis
  var x = d3.scaleLinear()
    .domain([0, 0])
    .range([ 0, width ]);
  svg.append("g")
    .attr("class", "myXaxis")   // Note that here we give a class to the X axis, to be able to call it later and modify it
    .attr("transform", "translate(0," + height + ")")
    .call(d3.axisBottom(x))
    .attr("opacity", "0")

  // Add Y axis
  var y = d3.scaleLinear()
    .domain([0, 500000])
    .range([ height, 0]);
  svg.append("g")
    .call(d3.axisLeft(y));

  // Add dots
  svg.append('g')
    .selectAll("dot")
    .data(data)
    .enter()
    .append("circle")
      .attr("cx", function (d) { return x(d.GrLivArea); } )
      .attr("cy", function (d) { return y(d.SalePrice); } )
      .attr("r", 1.5)
      .style("fill", "#69b3a2")

  // new X axis
  x.domain([0, 4000])
  svg.select(".myXaxis")
    .transition()
    .duration(2000)
    .attr("opacity", "1")
    .call(d3.axisBottom(x));

  svg.selectAll("circle")
    .transition()
    .delay(function(d,i){return(i*3)})
    .duration(2000)
    .attr("cx", function (d) { return x(d.GrLivArea); } )
    .attr("cy", function (d) { return y(d.SalePrice); } )
})

</script>

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