Google visualization 获取谷歌图表直方图条或该条范围的数据项

我正在尝试使用谷歌图表创建一个交互式直方图。 可以找到我生成直方图的代码

load（“当前”{packages:[“corechart”]}）；
google.charts.setOnLoadCallback（drawChart）；
函数绘图图（）{
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          ]);

        var options = {
          title: 'Distribution of Bus Speeds on Beer Sheva PT Segments 7-10AM',
                    hAxis: {title: 'Bus Speeds (kph)',
                           titleTextStyle: {
                                italic: false
            }},             
          vAxis: {title: 'PT Segments Count',
                 titleTextStyle: {
                                italic: false
            }},    
          legend: { position: 'none' },
          histogram: { bucketSize: 5 },
           colors:['red','yellow']


        };



        var chart = new google.visualization.Histogram(document.getElementById('chart_div'));
        chart.draw(data, options);
      }
    </script>
  </head>
  <body>
    <div id="chart_div" style="width: 900px; height: 500px;"></div>
  </body>
</html>

google.visualization.events.addListener(chart, 'select', function () {
  var selection = chart.getSelection();
  if (selection.length > 0) {
    // get position of selected bar
    var chartLayout = chart.getChartLayoutInterface();
    var barBounds = chartLayout.getBoundingBox('bar#' + (selection[0].column - 1) + '#' + selection[0].row);

    // get rows for selected bar
    var rows = data.getFilteredRows([{
      column: selection[0].column,
      minValue: chartLayout.getHAxisValue(barBounds.left),
      maxValue: chartLayout.getHAxisValue(barBounds.left + barBounds.width)
    }]);

    // create data view for selected rows
    var view = new google.visualization.DataView(data);
    view.setRows(rows);

    // get ids of selected bar
    var ids = view.getDistinctValues(0);

    console.log(JSON.stringify(ids));
  }
});

>= min value of the range
<  max value of the range

google.visualization.events.addListener(chart, 'select', function () {
  var selection = chart.getSelection();
  if (selection.length > 0) {
    // get position of selected bar
    var chartLayout = chart.getChartLayoutInterface();
    var barBounds = chartLayout.getBoundingBox('bar#' + (selection[0].column - 1) + '#' + selection[0].row);

    // get rows for selected bar
    var rows = data.getFilteredRows([{
      column: selection[0].column,
      test: function (value) {
        return ((value >= Math.ceil(chartLayout.getHAxisValue(barBounds.left))) &&
                (value < Math.floor(chartLayout.getHAxisValue(barBounds.left + barBounds.width))));
      }
    }]);

    // create data view for selected rows
    var view = new google.visualization.DataView(data);
    view.setRows(rows);

    // get ids of selected bar
    var ids = view.getDistinctValues(0);
    console.log(ids.length);
  }
});