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Antv/G2 折线图 DataSet 数据展开成指定格式

news 2025/8/3 2:55:33

DataSet 文档
G2 3.2 DataSet 文档

Demo：

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<head><meta charset="UTF-8" /><meta name="viewport" content="width=device-width, initial-scale=1.0" /><meta http-equiv="X-UA-Compatible" content="ie=edge" /><title>双折线图</title>
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<body><div id="chartcontainer"></div><script>/*Fixing iframe window.innerHeight 0 issue in Safari*/ document.body.clientHeight</script><script src="https://gw.alipayobjects.com/os/antv/pkg/_antv.g2-3.5.1/dist/g2.min.js"></script><script src="https://gw.alipayobjects.com/os/antv/pkg/_antv.data-set-0.10.1/dist/data-set.min.js"></script><script>// 在一行中保存多个城市的数据，需要将数据转换成// {month: 'Jan', city: 'Tokyo', temperature: 3.9}var data = [{month: 'Jan', Tokyo: 7.0, London: 3.9, trate: 0.23, lrate: 0.12}, {month: 'Feb', Tokyo: 6.9, London: 4.2, trate: 0.53, lrate: 0.32},{month: 'Mar', Tokyo: 9.5, London: 5.7, trate: 0.63, lrate: 0.52}, {month: 'Apr', Tokyo: 14.5, London: 8.5, trate: 0.23, lrate: 0.22}, {month: 'May',Tokyo: 18.4, London: 11.9, trate: 0.13, lrate: 0.62}, {month: 'Jun', Tokyo: 21.5, London: 15.2, trate: 0.03, lrate: 0.12},{month: 'Jul', Tokyo: 25.2,London: 17.0, trate: 0.93, lrate: 0.02},{month: 'Aug', Tokyo: 26.5, London: 16.6, trate: 0.23, lrate: 0.82}, {month: 'Sep', Tokyo: 23.3, London: 14.2, trate: 0.43, lrate: 0.92}, {month: 'Oct', Tokyo: 18.3, London: 10.3, trate: 0.63, lrate: 0.32},{month: 'Nov', Tokyo: 13.9, London: 6.6, trate: 0.73, lrate: 0.22}, {month: 'Dec', Tokyo: 9.6, London: 4.8, trate: 0.53, lrate: 0.52}];var ds = new DataSet(); // 创建DataSet 对象var dv = ds.createView().source(data);// 创建数据实例// fold 方式完成了行列转换，如果不想使用 DataSet 直接手工转换数据即可dv.transform({type: 'fold',fields: ['Tokyo', 'London'], // 展开字段集key: 'city', // key字段value: 'temperature' // value字段});console.log('dv',dv)var chart = new G2.Chart({container: 'chartcontainer',forceFit: true,height: 500});chart.source(dv, {month: {range: [0, 1]}});chart.tooltip({crosshairs: {type: 'line'}});chart.axis('temperature', {label: {formatter: function formatter(val) { // 格式化return val + '°C';}}});// 自定义图例chart.legend('city',{clickable: true,position: 'top', // 设置图例的显示位置      })chart.line().position('month*temperature').color('city').shape('smooth');chart.point().position('month*temperature').color('city').size(4).shape('circle').style({stroke: '#fff',lineWidth: 1});chart.render();</script>
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