我需要在Google折线图中添加多条趋势线，但我无法弄清楚如何使用多条折线。
这是我的代码示例，其中基于日期和值使用一行来构建图表：
<html>
<head>
<script type="text/javascript" src="https://www.google.com/jsapi"></script>
<script type="text/javascript">
function drawMultipleTrendlineChart() {
var chart;
var data = new google.visualization.DataTable();
data.addColumn('date', 'Date');
data.addColumn('number', 'Sales value');
data.addRow([new Date(2013, 3, 11), 10]);
data.addRow([new Date(2013, 4, 02), 650]);
data.addRow([new Date(2013, 5, 03), 55]);
data.addRow([new Date(2013, 6, 04), 95]);
data.addRow([new Date(2013, 7, 05), 400]);
data.addRow([new Date(2013, 8, 06), 600]);
data.addRow([new Date(2014, 0, 07), 800]);
data.addRow([new Date(2014, 1, 08), 900]);
data.addRow([new Date(2014, 2, 09), 3127]);
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},
trendlines: {
0: {color: 'red'}
},
title: 'Trendlines with multiple lines',
isStacked: true,
width: chartWidth,
height: chartHeight,
colors: ['#0000D8'],
hAxis: {
title: 'example title',
slantedText: false,
slantedTextAngle: 45,
textStyle: {
fontSize: 10
},
format: 'dd-MM-yyyy'
},
chartArea: {
left: 100,
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});
</script>
</head>
<body>
<div id="multipleTrendChart"></div>
</body>
我不会像这张照片那样做：Image_example
jsfiddle示例：http://jsfiddle.net/w3ez9gwb/
只需添加数据的更多列：
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), 100, 10],
[new Date(2013, 4, 02), 50, 650],
[new Date(2013, 5, 03), 70, 55],
[new Date(2013, 6, 04), 80, 95],
[new Date(2013, 7, 05), 50, 400],
[new Date(2013, 8, 06), 10, 600],
[new Date(2014, 0, 07), 20, 800],
[new Date(2014, 1, 08), 300, 900],
[new Date(2014, 2, 09), 100, 312]
]);
然后将趋势线添加到图表选项中，如下所示：
var chartOptions = {
tooltip: {
isHtml: true
},
trendlines: {
0: {
color: 'red'
},
1: {
color: 'yellow'
},
},
...
};
完整示例：JSFiddle
是否有一种方法可以使用ScatterChart代替LineChart？