How to use rose chart to display data proportion in ECharts

How to use rose chart to display data proportion in ECharts

Abstract: Rose chart is a visual data analysis tool that can be used to display data proportion. This article will introduce how to use the ECharts library to draw a rose chart in a web page, and provide specific code examples.

Introduction: In data analysis and visualization, the rose chart is a commonly used chart type. Its characteristic is that the center of the circle is the origin and the proportion of data is displayed as different sector angles. Through the rose chart, we can visually compare the proportions of different categories of data. ECharts is a powerful data visualization library that supports multiple chart types, including rose charts.

This article will be divided into the following parts:

1. Introducing the ECharts library
2. Preparing data
3. Creating a container
4. Set chart options
5. Draw a rose chart
6. Introduce the ECharts library
   First, we need to introduce the ECharts library into the web page. It can be imported directly through CDN, or imported after downloading the source files of ECharts.

<script src="https://cdn.jsdelivr.net/npm/echarts@4.9.0/dist/echarts.min.js"></script>

2. Preparing data
   Before drawing the rose chart, we need to prepare the data to be displayed. For example, here is a simple data example showing sales of a product in different regions.

var data = [
  {name: '地区1', value: 50},
  {name: '地区2', value: 30},
  {name: '地区3', value: 80},
  {name: '地区4', value: 60},
  {name: '地区5', value: 40}
];

Among them, name represents the name of the region, and value represents the sales volume of the region.

3. Create container
   In the web page, we need to create a container to hold the chart. You can use a div element as a container and set the width and height.

<div id="chart" style="width: 800px; height: 600px;"></div>

4. Set chart options
   Before drawing the chart, you need to set some chart options, such as title, legend, color, etc. The following is an example chart option:

var option = {
  title: {
    text: '产品销售占比',
    left: 'center'
  },
  legend: {
    orient: 'vertical',
    left: 'left',
    data: ['地区1', '地区2', '地区3', '地区4', '地区5']
  },
  color: ['#2378e1', '#60a1bc', '#87d9ef', '#de742f', '#7dbb94']
};

Among them, title represents the title of the chart, legend represents the legend, data represents the name of the legend, and color represents the color of the sector.

5. Drawing a Rose Chart
   Finally, we use the echarts.init method of the ECharts library, pass in the ID of the container, create a chart instance, and use the setOption method to set the options and data of the chart.

var chart = echarts.init(document.getElementById('chart'));
chart.setOption(option);

Through the above steps, we can draw a rose diagram on the web page.

Summary: This article introduces how to use the ECharts library to draw a rose chart on a web page, and provides specific code examples. Through the rose chart, we can visually display the proportion of data and help us conduct data analysis and decision-making. I hope this article can help readers understand and use rose diagrams.

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