Lemmings

<!DOCTYPE html>
<meta charset="utf-8">

<style>

body {
    background: #000 !important;
}

</style>

var margin = {top: 60, right: 60, bottom: 60, left: 60},
    width = 500 - margin.left - margin.right,
    height = 500 - margin.top - margin.bottom
    ;
var y = d3.scaleLinear()
    .range([0, height])

var x = d3.scaleLinear()
    .range([0, width]);

var svg = d3.select("#chart").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 + ")");

var lemmings = ["        bl        \n    bl  blblbl    \n      blblre      \n    bl  rerere    \n        orre      \n        orre      \n      orrere      \n        grgr      \n        grgr      \n        tatata    \n","        bl        \n    bl  blblbl    \n      blblre      \n    bl  rerere    \n        orre      \n        orre      \n      orrere      \n        grgr      \n      blblgrgr    \n      tata        \n","                  \n        bl        \n    bl  blblbl    \n      blblre      \n    bl  rerere    \n        orre      \n      ororre      \n      orrereog    \n      dggrgrgrgr  \n    tatadg  grtata\n","        bl        \n    bl  blblbl    \n      blblre      \n    bl  rerere    \n        orre      \n        orre      \n      orrere      \n        grgr      \n      tatagrgr    \n          tata    \n","        bl        \n    bl  blblbl    \n      blblre      \n    bl  rerere    \n        orre      \n        orre      \n      orrere      \n        grgr      \n        grgr      \n        tatata    \n","        bl        \n    bl  blblbl    \n      blblre      \n    bl  rerere    \n        orre      \n        orre      \n        reog      \n        grgr      \n      grgrdgta    \n      tata        \n","                  \n        bl        \n    bl  blblbl    \n      blblre      \n    bl  rerere    \n        orre      \n        orog      \n        reog      \n      grgrgrdgdg  \n    tatata  dgtata\n","        bl        \n    bl  blblbl    \n      blblre      \n    bl  rerere    \n        orre      \n        orre      \n        reog      \n        grgr      \n      tatadgdg    \n          tata    \n"]

var loopIndex = 0;

x.domain([0, 9])
y.domain([0, lemmingData[0].points.length])

svg.selectAll(".block-group")
    .data(lemmingData.filter(function(d) { return d.num == 0 }))
  .enter().append("g")
    .attr("class", "block-group")
    .attr("transform", function(d,i) {return "translate(0," + y(i) + ")" } )
 .selectAll(".block")
    .data(function(d) { return d.points })
  .enter().append("rect")
    .attr("class", "block")
    .attr("x", function(d, i) { return x(i) })
    .attr("width", width/x.domain()[1])
    .attr("height", height/y.domain()[1])
    .style("fill", function(d) {  
        switch(d) {
            case "re":
                return "#a4170f"
                break;
            case "bl":
                return "#1a315f"
                break;
            case "or":
                return "#df7006"
                break;
            case "gr":
                return "#414141"
                break;
            case "ta":
                return "#a58271"
                break;
            case "dg":
                return "#252525"
                break;
            default:
                return "#000"
        }
    });

var indexNum = 0;
var t = d3.interval(function(elapsed) {

svg.selectAll(".block-group")
    .data(lemmingData.filter(function(d) { return d.num == indexNum }))
 .selectAll(".block")
    .data(function(d) { return d.points })
    .attr("x", function(d, i) { return x(i) })
    .style("fill", function(d) {  
        switch(d) {
            case "re":
                return "#a4170f"
                break;
            case "bl":
                return "#1a315f"
                break;
            case "or":
                return "#df7006"
                break;
            case "gr":
                return "#414141"
                break;
            case "ta":
                return "#a58271"
                break;
            case "dg":
                return "#252525"
                break;
            default:
                return "#000"
        }
    });

if(indexNum == lemmings.length-1) {
        indexNum = 0;
    } else {
        indexNum += 1;
    }

}, 100);

</script>

https://d3js.org/d3.v4.min.js