Apache ECharts5新增动态图表——动态排序柱状图

Apache ECharts 5 新增支持动态排序柱状图（bar-racing），帮助开发者方便地创建带有时序性的图表，展现数据随在时间维度上的变化，讲述数据的演变过程。下面我们来看一下百度的实例代码！

var updateFrequency = 2000;
var dimension = 0;
//柱状图颜色
var countryColors = {"Australia":"#00008b","Canada":"#f00","China":"#ffde00","Cuba":"#002a8f","Finland":"#003580","France":"#ed2939","Germany":"#000","Iceland":"#003897","India":"#f93","Japan":"#bc002d","North Korea":"#024fa2","South Korea":"#000","New Zealand":"#00247d","Norway":"#ef2b2d","Poland":"#dc143c","Russia":"#d52b1e","Turkey":"#e30a17","United Kingdom":"#00247d","United States":"#b22234"};
//数据
$.when(
    $.getJSON('https://cdn.jsdelivr.net/npm/emoji-flags@1.3.0/data.json'),
    $.getJSON('https://cdn.jsdelivr.net/gh/apache/echarts-website@asf-site/examples/data/asset/data/life-expectancy-table.json')
).done(function (res0, res1) {
    var flags = res0[0];
    var data = res1[0];
    var years = [];
    for (var i = 0; i < data.length; ++i) {
        if (years.length === 0 || years[years.length - 1] !== data[i][4]) {
            years.push(data[i][4]);
        }
    }

    function getFlag(countryName) {
        if (!countryName) {
            return '';
        }
        return (flags.find(function (item) {
            return item.name === countryName;
        }) || {}).emoji;
    }
    var startIndex = 10;
    var startYear = years[startIndex];

    var option = {
        grid: {
            top: 10,
            bottom: 30,
            left: 150,
            right: 80
        },
        xAxis: {
            max: 'dataMax',
            label: {
                formatter: function (n) {
                    return Math.round(n);
                }
            }
        },
        dataset: {
            source: data.slice(1).filter(function (d) {
                return d[4] === startYear;
            })
        },
        yAxis: {
            type: 'category',
            inverse: true,
            max: 10,
            axisLabel: {
                show: true,
                textStyle: {
                    fontSize: 14
                },
                formatter: function (value) {
                    return value + '{flag|' + getFlag(value) + '}';
                },
                rich: {
                    flag: {
                        fontSize: 25,
                        padding: 5
                    }
                }
            },
            animationDuration: 300,
            animationDurationUpdate: 300
        },
        series: [{
            realtimeSort: true,
            seriesLayoutBy: 'column',
            type: 'bar',
            itemStyle: {
                color: function (param) {
                    return countryColors[param.value[3]] || '#5470c6';
                }
            },
            encode: {
                x: dimension,
                y: 3
            },
            label: {
                show: true,
                precision: 1,
                position: 'right',
                valueAnimation: true,
                fontFamily: 'monospace'
            }
        }],
        // Disable init animation.
        animationDuration: 0,
        animationDurationUpdate: updateFrequency,
        animationEasing: 'linear',
        animationEasingUpdate: 'linear',
        graphic: {
            elements: [{
                type: 'text',
                right: 160,
                bottom: 60,
                style: {
                    text: startYear,
                    font: 'bolder 80px monospace',
                    fill: 'rgba(100, 100, 100, 0.25)'
                },
                z: 100
            }]
        }
    };

    myChart.setOption(option);

    for (var i = startIndex; i < years.length - 1; ++i) {
        (function (i) {
            setTimeout(function () {
                updateYear(years[i + 1]);
            }, (i - startIndex) * updateFrequency);
        })(i);
    }

    function updateYear(year) {
        var source = data.slice(1).filter(function (d) {
            return d[4] === year;
        });
        option.series[0].data = source;
        option.graphic.elements[0].style.text = year;
        myChart.setOption(option);
    }
})