D3 v4 - Group barChart by shimizu

index.html

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<meta http-equiv="X-UA-Compatible" content="IE=edge"/>
<title>D3 v4 - Group barChart</title>
<style>
#graph {
    width: 900px;
    height: 500px;
}
.tick line {
    stroke-dasharray: 2 2 ;
    stroke: #ccc;
}
</style>
</head>

<body>
<div id="graph"></div>    
    
<script src="//cdnjs.cloudflare.com/ajax/libs/d3/4.1.1/d3.min.js"></script>    
<script>
!(function(){
    "use strict"
    
    var width,height
    var chartWidth, chartHeight
    var margin
    var svg = d3.select("#graph").append("svg")
    var axisLayer = svg.append("g").classed("axisLayer", true)
    var chartLayer = svg.append("g").classed("chartLayer", true)
    
    
    var xScale = d3.scaleBand()
        
        
    
    var xInScale = d3.scaleBand();
    
    var yScale = d3.scaleLinear()
    
    var color = d3.scaleOrdinal()
        .range(["#5DDEC9", "#EF64AD", "#7b6888", "#BA67E5", "#E0E23B", "#d0743c", "#ff8c00"]);
    
    
    
    d3.csv("data.csv", cast,  main)
    
    function cast(d) {
        Object.keys(d).forEach(function(key){
            if (!isNaN(+d[key])) d[key] = +d[key]
        })
        return d 
    }
    
    function main(data) {
        console.log(data)
        
        
        var nested = d3.nest()
            .rollup(function(d){ delete d[0].contry; return d[0] })
            .key(function(d){ return d.contry })
            .entries(data)

        nested.forEach(function(d){
            d.age = Object.keys(d.value).map(function(key){
                return {key:key, value:d.value[key]}
            })
        })

        setSize(nested)
        drawAxis()
        drawChart(nested)    
    }
    
    function setSize(nested) {
        width = document.querySelector("#graph").clientWidth
        height = document.querySelector("#graph").clientHeight
    
        margin = {top:0, left:100, bottom:40, right:0 }
        
        
        chartWidth = width - (margin.left+margin.right)
        chartHeight = height - (margin.top+margin.bottom)
        
        svg.attr("width", width).attr("height", height)
        
        axisLayer.attr("width", width).attr("height", height)
        
        chartLayer
            .attr("width", chartWidth)
            .attr("height", chartHeight)
            .attr("transform", "translate("+[margin.left, margin.top]+")")
            
        
                
        xScale.domain(nested.map(function(d) { return d.key }))
            .range([0, chartWidth]).paddingInner(0.1)
            
        
        var ageNames = Object.keys(nested[0].value)
        
        xInScale.domain(ageNames).range([0, xScale.bandwidth()])
        
        var yMax = d3.max(nested.map(function(d){
            var values = Object.keys(d.value).map(function(key){
                return d.value[key]
            })
            return d3.max(values)
        }))

        yScale.domain([0, yMax]).range([chartHeight, 0])

            
    }
    
    function drawChart(nested) {
        var t = d3.transition()
            .duration(1000)
            .ease(d3.easeLinear)

        
        var contry = chartLayer.selectAll(".contry")
            .data(nested)
            
        var newCountry = contry.enter().append("g").attr("class", "contry")
        

        contry.merge(newCountry)
            .attr("transform", function(d) { return "translate(" + [xScale(d.key), 0] + ")"; });

        
        var bar = newCountry.selectAll(".bar")
            .data(function(d){ return d.age })

        var newBar = bar.enter().append("rect").attr("class", "bar")

                        
        bar.merge(newBar)
            .attr("width", xInScale.bandwidth())
            .attr("height", 0)
            .attr("fill", function(d) { return color(d.key); })
            .attr("transform", function(d) { return "translate(" + [xInScale(d.key), chartHeight] + ")" })

        
        
        //アニメーション
       bar.merge(newBar).transition(t)
            .attr("height", function(d) { return chartHeight - yScale(d.value); })
            .attr("transform", function(d) { return "translate(" + [xInScale(d.key), yScale(d.value)] + ")" })
        
        
    }
    
    function drawAxis(){
        var yAxis = d3.axisLeft(yScale)
            .tickSizeInner(-chartWidth)
        
        axisLayer.append("g")
            .attr("transform", "translate("+[margin.left, margin.top]+")")
            .attr("class", "axis y")
            .call(yAxis);
            
        var xAxis = d3.axisBottom(xScale)
    
        axisLayer.append("g")
            .attr("class", "axis x")
            .attr("transform", "translate("+[margin.left, chartHeight]+")")
            .call(xAxis);
        
    }    
    
}());   
</script>    
</body>
</html>

data.csv

contry,2000,2001,2002,2008,2009,2010,2011
日本,2704659,4499890,2159981,3853788,10604510,8819342,4114496
アメリカ,2027307,3277946,1420518,2454721,7017731,5656528,2472223
フランス,1208495,2141490,1058031,1999120,5355235,5120254,2607672
イギリス,1140516,1938695,925060,1607297,4782119,4746856,3187797
中国,894368,1558919,725973,1311479,3596343,3239173,1575308
韓国,737462,1345341,679201,1203944,3157759,3414001,1910571