使用G2创建阶梯线图表/How To Use G2 To Make Ladder Line Chart

in utopian-io •  7 years ago  (edited)

Summary:

G2 is a set of graphically-based graphical syntax that is data-driven and highly user-friendly and extensible, allowing users to build a wide variety of interactive statistics without having to worry about detailed implementation details chart.
G2 是一套基于可视化编码的图形语法,以数据驱动,具有高度的易用性和扩展性,用户无需关注各种繁琐的实现细节,一条语句即可构建出各种各样的可交互的统计图表。

您将从这个教程中学到什么

  • 如何引入js文件
  • 如何定义容器
  • 如何定义数据
  • 如何引用数据
  • 如何渲染图表

学习此教程的必备条件

教程难度

  • 容易

教程内容

演示效果
demo.gif

1. 知识点A - 如何引入js文件

<script src="./js/g2.min.js"></script>
<script src="./js/data-set.min.js"></script>

使用内嵌对js文件进行引入,用于后期图表使用。

2. 知识点B - 如何定义容器

<div id="jietitu"></div>

使用div定义容器,用于展示图表。容器名:jietitu


3. 知识点C - 如何定义数据

  const data = [
    { yf: '一月', Demo: 51 },
    { yf: '二月', Demo: 91 },
    { yf: '三月', Demo: 34 },
    { yf: '四月', Demo: 47 },
    { yf: '五月', Demo: 63 },
    { yf: '六月', Demo: 58 },
    { yf: '七月', Demo: 56 },
    { yf: '八月', Demo: 77 },
    { yf: '九月', Demo: 99 },
    { yf: '十月', Demo: 106 },
    { yf: '十一月', Demo: 88 },
    { yf: '十二月', Demo: 56 }
  ];
  • data:使用数组形式定义数据。
  • 格式:{名称:'对应值',名称:对应值}

4. 知识点D - 如何引用数据

  const chart = new G2.Chart({
    container: 'jietitu',
    forceFit: true,
    height: window.innerHeight
  });
  chart.source(data, {
    yf: {
      range: [ 0, 1 ]
    }
  });
  • container:定于数据从jietitu数组取值。
  • forceFit: 定义图表的宽度自适应开关,默认为 false,设置为 true 时表示自动取 dom(实例容器)的宽度。
  • height: 定义图表高度。
  • source:定义为chart装载数据,返回chart对象。
  • range:定义输出数据的范围,默认[ 0, 1 ],格式为 [ min, max ],min 和 max 均为 0 至 1 范围的数据。

5. 知识点E - 如何渲染图表

  chart.line().position('yf*Demo').shape('hv');
  chart.render();
  • line:定义线图组件。
  • position:定义将数据值映射到图形的位置上的方法。
    格式:position('fieldA*fieldB')使用 * 连接,position 属性会对多个字段进行数据的映射。
  • render:图表绘制的最后一步,用于将图表渲染至画布。

完整代码

<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width,height=device-height">
    <title>阶梯折线图</title>
</head>
<body>
<div id="jietitu"></div>
<script src="./js/g2.min.js"></script>
<script src="./js/data-set.min.js"></script>
<script>
  const data = [
    { yf: '一月', Demo: 51 },
    { yf: '二月', Demo: 91 },
    { yf: '三月', Demo: 34 },
    { yf: '四月', Demo: 47 },
    { yf: '五月', Demo: 63 },
    { yf: '六月', Demo: 58 },
    { yf: '七月', Demo: 56 },
    { yf: '八月', Demo: 77 },
    { yf: '九月', Demo: 99 },
    { yf: '十月', Demo: 106 },
    { yf: '十一月', Demo: 88 },
    { yf: '十二月', Demo: 56 }
  ];
  const chart = new G2.Chart({
    container: 'jietitu',
    forceFit: true,
    height: window.innerHeight
  });
  chart.source(data, {
    yf: {
      range: [ 0, 1 ]
    }
  });
  chart.line().position('yf*Demo').shape('hv');
  chart.render();
</script>
</body>
</html>

最终效果
demo.gif

系列课程

我在乌托邦上完成20多个关于eCharts的教程。
I have completed 20+ tutorials about echarts.

如果您喜欢我的教程,可以在我的个人档案页面,获取更多信息。
If you like my tutorial , You can check out your profile for more such tutorials.

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You can use the "zqz-tutorial" tag to see all the tutorials I've posted.

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Thank you for the contribution. It has been approved.

  • it’s funny when you say that you have contributed 20+ echart. Let’s avoide saying that? 😜
    You can contact us on Discord.
    [utopian-moderator]

ok~
Next contribution I will delete this part.
Thank you very much~

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