echarts统计x轴区间的数值实例代码详解

var bins = ecStat.histogram(girth);
var 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]];
});

<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
　　　　 var edata = new Array();
  var scopeMin = 0;
  var scopeMax = 100;
  var interval = (scopeMax-scopeMin)/10;
  var tmin = scopeMin;
  while(tmin < scopeMax){
   var x0 = tmin; 
   var x1 = tmin+interval;
   var 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],
     y: 2,
     tooltip: 2,
     label: 2
    },
    // data: data
    data: 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>