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   http://www.apache.org/licenses/LICENSE-2.0

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<html>
    <head>
        <meta charset="utf-8">
        <script src="lib/esl.js"></script>
        <script src="lib/config.js"></script>
    </head>
    <body>
        <style>
            html, body, #main {
                width: 100%;
                height: 100%;
            }
        </style>
        <div id="main"></div>
        <script>


            require([
                'echarts'
                // 'echarts/chart/scatter',
                // 'echarts/component/legend',
                // 'echarts/component/grid',
                // 'echarts/component/dataZoom',
                // 'echarts/component/visualMapContinuous'
            ], function (echarts) {

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

                var data1 = [];
                var data2 = [];
                var data3 = [];

                var symbolCount = 6;
                var max = 0;

                for (var i = 0; i < 50000; i++) {
                    data1.push([
                        i * 5, i * 4, i * 20
                    ]);
                    max = Math.max(max, i * 20);
                }

                var option = {
                    legend: {
                        top: 50,
                        data: ['scatter', 'scatter2', 'scatter3']
                    },
                    grid: {
                        top: '26%',
                        bottom: '26%'
                    },
                    dataZoom: {
                        type: 'inside'
                    },
                    xAxis: {
                        type: 'value',
                        splitLine: {
                            show: false
                        }
                    },
                    yAxis: {
                        type: 'value',
                        splitLine: {
                            show: false
                        }
                    },
                    visualMap: [
                        {
                            min: 0,
                            max: max,
                            orient: 'horizontal',
                            left: 'center',
                            bottom: 20,
                            show: true,
                            itemWidth: 30,
                            calculable: true,
                            inverse: true,
                            dimension: 2,
                            inRange: {
                                color: ['red', 'orange', 'blue']
                            }
                        }
                    ],
                    series: [
                        {
                            name: 'scatter',
                            type: 'scatter',
                            data: data1
                        }
                    ]
                };

                console.profile('visualMap');

                chart.setOption(option);

                console.profileEnd('visualMap');
            })

        </script>
    </body>
</html>