Numerical statistics x-axis interval echarts

Sometimes we need to count the number of y-axis echarts custom map, statistics x-axis range.

Echarts idea is to use a custom configuration: option.series [i] .type = 'custom' in renderItem (params, api) processing function, here including two parameters: params data corresponding to each dataItem; api is callable methods (api.value () and api.coord ()). For more information please see the official documents.

The following example is adapted from the official:  https://www.echartsjs.com/examples/editor.html?c=bar-histogram  part, the following reference ecStat.js processes data into a format modifying their assembled into the desired

var bins = ecStat.histogram(girth);
where min = infinity;
var max = -Infinity;

edata = echarts.util.map(bins.data, function (item, index) {
   var x0 = bins.bins[index].x0;
   var x1 = bins.bins[index].x1;
   interval = x1 - x0;
   min = Math.min(min, x0);　　
　　max = Math.max(max, x1);
　　return [x0, x1, item[1]];
});

The reason is that when referencing ecStat.js processing data, the following error may occur, temporarily did not find a solution.

Code rewriting display as follows:

 

<div id="main1" style="width: 1000px;height: 500px"></div>
<script type="text/javascript">
    $(function(){
        generateChart();
    });
    function generateChart(){
        var myChart1 = echarts.init(document.getElementById('main1'));
        var girth =  [19, 26.4, 34, 41.4, 42.4, 42.7, 42.9, 43.1, 43.2, 43.3, 43.3, 43.3, 44.9, 45.4, 46.2, 46.7, 48, 48, 49.1, 54.2];

        //自定义拼装数据方式
　　　　 was edata =  new Array ();
        was scopeMin =  0 ;
        was scopeMax =  100 ;
        was Interval = (scopeMax - scopeMin) / 10; 
        where tmin = scopeMin;
        while (t min < scopeMax) {
             where x0 = t min; 
            where x1 = t min + interval;
            was samplenum= 0;
            for(var i=0;i<girth.length;i++){
                if((scopeMin == x0 && girth[i] < x0) || (x0 <= girth[i] && x1 > girth[i])
                    ||(scopeMin == x1 && girth[i] > x1)) {
                    samplenum++;                
                }
            }
            tmin += interval;
            edata.push([x0, x1, samplenum]);
        }


        var option = {
            color: ['rgb(25, 183, 207)'],
            grid: {
                top: 80,
                containLabel: true
            },
            xAxis: [{
                type: 'value',
                min: scopeMin,
                max: scopeMax,
                interval: interval
            }],
            yAxis: [{
                type: 'value',
            }],
            series: [{
                name: 'height',
                type: 'custom',
                renderItem: renderItem,
                label: {
                    normal: {
                        show: true,
                        position: 'top'
                    }
                },
                encode: {
                    x: [0, 1],
                    and: 2 ,
                    tooltip: 2,
                    label: 2
                },
                // date: 
                date: edata
            }]
        };
        myChart1.setOption(option);
        window.onresize = function () {
            myChart1.resize();
        }
    }
        
    function renderItem(params, api) {
        var yValue = api.value(2);
        var start = api.coord([api.value(0), yValue]);
        var size = api.size([api.value(1) - api.value(0), yValue]);
        var style = api.style();

        return {
            type: 'rect',
            shape: {
                x: start[0] + 1,
                y: start[1],
                width: size[0] - 2,
                height: size[1]
            },
            style: style
        };
    }
</script>