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How to use scatter plots to display data relationships in ECharts

王林Original: 2023-12-17 21:53:45846browse

How to use scatter plots to display data relationships in ECharts requires specific code examples

ECharts is an open source data visualization library that provides a wealth of chart types For users to display data. Among them, scatter plot is a commonly used way to display data. By expressing the position of data points in the coordinate system, the relationship between data can be visually displayed. This article will introduce how to use scatter plots to display data relationships in ECharts, and provide specific code examples.

First of all, to use ECharts to draw a scatter chart, you need to introduce the ECharts library file into the HTML page. It can be introduced through the following steps:

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>使用散点图展示数据关系</title>
  <script src="https://cdn.jsdelivr.net/npm/echarts@5.2.0/dist/echarts.min.js"></script>
</head>
<body>
  <div id="scatterChart" style="width: 600px; height: 400px"></div>
  <script src="scatter.js"></script>
</body>
</html>

Create a div element in HTML and assign it an id for use in JavaScript. Then, introduce the ECharts library file through the <script></script> tag. Next, use the <script></script> tag to introduce a JavaScript file named scatter.js for drawing the scatter plot.

In the scatter.js file, you can write specific code to draw a scatter plot. First, you need to get the reference to the div element:

var scatterChart = echarts.init(document.getElementById('scatterChart'));

Then, define the data that needs to be displayed. Taking a simple two-dimensional scatter chart as an example, you can define an array containing multiple data points:

var data = [
  [10, 4],
  [15, 10],
  [7, 8],
  [20, 14],
  // 更多数据点...
];

Next, you can set the style and data of the scatter chart through the option configuration items provided by ECharts . First, you need to define an empty object as the initial value of the option:

var option = {};

Then, you can set the relevant configuration of the scatter plot in the option object, including the coordinate axis, data point style, legend, etc. Here, set x Take the scale range and name of the axis and y-axis as an example:

option = {
  xAxis: {
    type: 'value',
    min: 0,
    max: 25,
    name: 'X轴'
  },
  yAxis: {
    type: 'value',
    min: 0,
    max: 15,
    name: 'Y轴'
  },
  series: [{
    type: 'scatter',
    data: data
  }]
};

With the above code, the scatter plot has been drawn. Finally, just use the setOption method to apply the configuration to the chart to complete the display of the scatter chart:

scatterChart.setOption(option);

In summary, the above code implements drawing a scatter chart in ECharts and displaying data relationships. function. By introducing the ECharts library file, creating the corresponding HTML page, and configuring the scatter chart style and data in the JavaScript file, the scatter chart can be drawn. We hope that the code examples provided in this article can help readers better understand how to use scatter plots to display data relationships in ECharts.

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