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javascript - 带有谷歌可视化的多色折线图

转载 作者:行者123 更新时间:2023-11-30 14:38:38 25 4
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我在我的项目中使用谷歌折线图并面临一个问题,我需要更改某些部分的颜色以可视化目标状态随时间的变化。它应该是这样的: enter image description here

我已经搜索了很长时间,但找不到使用谷歌图表的方法。我的解决方法是在图表中添加另一个系列,并根据状态交替将第二行 eq 的值设置为第一行,但这看起来很乏味。 enter image description here

有没有正确的方法来做到这一点?这是我的变通解决方案的示例:

function drawMultipleTrendlineChart() {

var chart;

var data = new google.visualization.DataTable();
data.addColumn('date', 'Date');
data.addColumn('number', 'Sales value A');
data.addColumn('number', 'Sales value B');

data.addRows([
[new Date(2013, 3, 11), 200, 0],
[new Date(2013, 4, 02), 500, 0],
[new Date(2013, 5, 03), 700, 0],
[new Date(2013, 6, 04), 800, 800],
[new Date(2013, 7, 05), 500, 500],
[new Date(2013, 8, 06), 900, 0],
[new Date(2014, 0, 07), 800, 0],
[new Date(2014, 1, 08), 1100, 1100],
[new Date(2014, 2, 09), 1000, 1000],
[new Date(2014, 2, 10), 1000, 0],
[new Date(2014, 3, 11), 800, 0],
]);


var formatter = new google.visualization.NumberFormat({
fractionDigits: 2,
prefix: 'R$:'
});
formatter.format(data, 1);
var dateFormatter = new google.visualization.NumberFormat({
pattern: 'MMM yyyy'
});
dateFormatter.format(data, 0);
var chartHeight = 400;
var chartWidth = 600;
var chartOptions = {
tooltip: {
isHtml: true
},
title: 'Trendlines with multiple lines',
isStacked: true,
width: chartWidth,
height: chartHeight,
colors: ['#0000D8', '#00dddd'],
hAxis: {
title: 'example title',
slantedText: false,
slantedTextAngle: 45,
textStyle: {
fontSize: 10
},
format: 'dd-MM-yyyy'
},
chartArea: {
left: 50,
top: 20,
width: (chartWidth - 10),
height: (chartHeight - 90)
}
};
chart = new google.visualization.LineChart(document.getElementById('multipleTrendChart'));
chart.draw(data, chartOptions);
}

google.load('visualization', '1', {
packages: ['corechart'],
callback: drawMultipleTrendlineChart
});
<html>

<head>
<script type="text/javascript" src="https://www.google.com/jsapi"></script>
</script>
</head>

<body>
<div id="multipleTrendChart"></div>
</body>

</html>

最佳答案

看完这个答案后How to change color for negative values ,我试过了,这对我有用。答案是使用 DataView API 来操作数据。

google.charts.load('current', {
callback: drawLineColors,
packages: ['corechart']
});

function drawLineColors() {
var data = new google.visualization.DataTable();
data.addColumn('number', 'X');
data.addColumn('number', 'Blue Team');
data.addColumn('number', 'Red Team');

data.addRows([
[0, 0, 0],
[3, 1700, 1600],
[6, 1800, 1700],
[9, 2500, 2423],
[12, 3000, 2500],
[15, 4700, 5800],
[18, 5200, 5900],
[21, 5500, 6000],
[24, 6000, 6200],
[27, 6800, 6700],
[30, 7500, 7000],
[33, 7800, 8200],
[36, 7900, 9756],
[39, 8000, 10752],
[42, 9000, 13753],
[45, 15000, 17845]
]);

var options = {
legend: {
position: 'top'
},
enableInteractivity: false,
width: 712,
height: 156,
backgroundColor: {
fill: 'transparent'
},
curveType: 'function',
hAxis: {
title: 'Time'
},
vAxis: {
title: 'Team Gold'
}
};

var dataView = new google.visualization.DataView(data);
dataView.setColumns([
// reference first column by index
0,
// variance
{
calc: function(data, row) {
return data.getValue(row, 1);
},
type: 'number',
label: 'Y'
},
// variance color
{
calc: function(data, row) {
var val = data.getValue(row, 2) - data.getValue(row, 1);
if (val >= 0) {
return '#0000FF';
}
return '#FF0000';
},
type: 'string',
role: 'style'
}
]);

var chart = new google.visualization.LineChart(document.getElementById('chart_div'));
chart.draw(dataView, options);
}
<script src="https://www.gstatic.com/charts/loader.js"></script>
<div id="chart_div"></div>

关于javascript - 带有谷歌可视化的多色折线图,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/50034765/

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