G2 - 等高线

             <!DOCTYPE html>
    <html>
      <head>
        <meta charset="utf-8">
        <title>等高线</title>
<script src="https://a.alipayobjects.com/jquery/jquery/1.11.1/jquery.js"></script>
<script src="https://gw.alipayobjects.com/as/g/datavis/g2/2.3.13/index.js"></script>
      </head>
      <body>
          <div id="c1"></div>
 <script>
//模拟数据，用户使用时可用真实数据代替
var Stat = G2.Stat;
var data = [];
for(var i = 0; i <= 20; i ++) {
    for(var j = 0; j <= 20; j ++) {
        var x = i*25.6;
        var y = j*19.2;

        var z = 700-(x+0.5*y)+Math.random()*(400);

        data.push({
            l: x,
            g: y,
            Altitude: z
        });
    }
}


var chart = new G2.Chart({
    id: 'c1',
    forceFit: true,
    height: 450
});

//为了将数据与图片上的位置完全吻合，我们需要将横轴和纵轴的范围设定为数据对应范围，并将范围优化处理关闭
var defs = {
    'l': {
        type: 'linear',
        min: 0,
        max: 512,
        nice: false//优化处理关闭
    },
    'g': {
        type: 'linear',
        min: 0,
        max: 384,
        nice: false
    },
    //等高线条数
    'Altitude': {
        tickCount:5
    }
};

//由于数据坐标的原点在左下角，但是图片坐标原点在左上角，所以需要将数据坐标翻转
chart.coord().reflect();

//使用图片后可以隐藏坐标轴
chart.axis(false);
chart.source(data,defs);
chart.contour().position(Stat.smooth.loess.triangular('l*g*Altitude',0.01)).color('Altitude','hue').size(3);

//引入背景图片
chart.guide().image([0,384],[512,0],{
    src: 'https://t.alipayobjects.com/images/T1QoJoXdFXXXXXXXXX.jpg'
});
chart.render();

</script>


      </body>
    </html>
          
        

等高线

等高线指的是地形图上高程相等的各点所连成的闭合曲线。在等高线上标注的数字为该等高线的海拔高度。等高线按其作用不同，可分为首曲线、计曲线、间曲线与助曲线四种。了解更多

<!DOCTYPE html>
    <html>
      <head>
        <meta charset="utf-8">
        <title>等高线</title>
        <script src="https://unpkg.com/react@15/dist/react.min.js"></script>
        <script src="https://unpkg.com/react-dom@15/dist/react-dom.min.js"></script>
        <script src="https://a.alipayobjects.com/g/datavis/g2/2.3.13/g2.js"></script>
        <script src="https://unpkg.com/g2-react@1.2.0/dist/index.js"></script>
        <script src="https://cdn.bootcss.com/babel-core/5.8.38/browser.min.js"></script>
        <script src="https://unpkg.com/axios/dist/axios.min.js"></script>
      </head>
      <body>
          <div id="c1"></div>
 <script type="text/babel">
    const Chart = createG2(chart => {
            const Stat = G2.Stat;
            chart.col('l', {
                type: 'linear',
                min: 0,
                max: 512,
                nice: false//优化处理关闭
            });
            chart.col('g', {
                type: 'linear',
                min: 0,
                max: 384,
                nice: false
            });
            //等高线条数
            chart.col('Altitude', {
                tickCount:5
            });

//由于数据坐标的原点在左下角，但是图片坐标原点在左上角，所以需要将数据坐标翻转
            chart.coord().reflect();

//使用图片后可以隐藏坐标轴
            chart.axis(false);
            chart.contour().position(Stat.smooth.loess.triangular('l*g*Altitude',0.01)).color('Altitude','hue').size(3);

//引入背景图片
            chart.guide().image([0,384],[512,0],{
                src: 'https://t.alipayobjects.com/images/T1QoJoXdFXXXXXXXXX.jpg'
            });
            chart.render();
    });

const MyComponent = React.createClass({
      getInitialState() {
          let data = [];
                for(let i = 0; i <= 20; i ++) {
                    for(let j = 0; j <= 20; j ++) {
                        let x = i*25.6;
                        let y = j*19.2;

let z = 700-(x+0.5*y)+Math.random()*(400);

data.push({
                            l: x,
                            g: y,
                            Altitude: z
                        });
                    }
                }
        return {
          data: data,
          forceFit: true,
          height: 450
        };
      },
      render() {
        return (
          <div>
            <Chart
              data={this.state.data}
              width={this.state.width}
              height={this.state.height}
              plotCfg={this.state.plotCfg}
              forceFit={this.state.forceFit} />
          </div>
        );
      },
    });
    ReactDOM.render(<MyComponent />, document.getElementById('c1'));
</script>

</body>
    </html>