移动Google Chart列注释位置

Question

我使用下面的代码生成一个柱形图,列中有数字,但我真的希望它们位于条形图的底部,而不是顶部.

这是我的图表的视觉效果:

    var data = google.visualization.arrayToDataTable([
        ['Type', 'Completed', 'Outstanding'],
        ['Item 1', 75, 25],
        ['Item 2', 50, 40],
        ['Item 3', 80, 15]
    ]);

    var view = new google.visualization.DataView(data);
    view.setColumns([0, 1,
        {
            calc: "stringify",
            sourceColumn: 1,
            type: "string",
            role: "annotation"
        },
        2,
        {
            calc: "stringify",
            sourceColumn: 2,
            type: "string",
            role: "annotation"
        }]);

    var options = {
        legend: 'none',
        height: 270,
        chartArea: { 'width': '80%', 'height': '80%' },
        bar: { groupWidth: '80%' },
        vAxis: {
            textPosition: 'none',
            gridlines: {
                color: 'transparent'
            }
        },
      series: {
          0: { color: '#00A887' },
          1: { color: '#F6323E' },
        }

    };

    var chart = new google.visualization.ColumnChart(document.getElementById('northPMChart'));

    chart.draw(view, options);

任何帮助非常感谢.

Answer 1

没有用于将注释移动到底部的 标准配置选项

您可以annotations.stem.length从默认位置进行调整

但这会将所有注释移动相同的距离，

这在这里行不通

您可以手动移动注释，如以下代码片段所示...

但是，如果您需要生成图表的 png 图像 getImageURI，则使用时不会反映自定义修改

此外，只要有交互性（例如列悬停） ，图表就会将注释移回其原始位置

所以当活动发生时必须使用 aMutationObserver将它们移回来......

google.charts.load('current', {
  callback: function () {
    drawChart();
    window.addEventListener('resize', drawChart, false);
  },
  packages:['corechart']
});

function drawChart() {
    var data = google.visualization.arrayToDataTable([
        ['Type', 'Completed', 'Outstanding'],
        ['Item 1', 75, 25],
        ['Item 2', 50, 40],
        ['Item 3', 80, 15]
    ]);

    var view = new google.visualization.DataView(data);
    view.setColumns([0, 1,
        {
            calc: "stringify",
            sourceColumn: 1,
            type: "string",
            role: "annotation"
        },
        2,
        {
            calc: "stringify",
            sourceColumn: 2,
            type: "string",
            role: "annotation"
        }]);

    var options = {
        legend: 'none',
        height: 270,
        chartArea: { 'width': '80%', 'height': '80%' },
        bar: { groupWidth: '80%' },
        vAxis: {
            textPosition: 'none',
            gridlines: {
                color: 'transparent'
            }
        },
      series: {
          0: { color: '#00A887' },
          1: { color: '#F6323E' },
        }

    };

    var container = document.getElementById('northPMChart');
    var chart = new google.visualization.ColumnChart(container);

    // move annotations
    var observer = new MutationObserver(function () {
      Array.prototype.forEach.call(container.getElementsByTagName('text'), function(annotation) {
        if ((annotation.getAttribute('text-anchor') === 'middle') &&
            (annotation.getAttribute('fill') === '#ffffff')) {
          var chartLayout = chart.getChartLayoutInterface();
          annotation.setAttribute('y',
            chartLayout.getYLocation(0) - (parseInt(annotation.getAttribute('font-size')) / 2)
          );
        }
      });
    });
    observer.observe(container, {
      childList: true,
      subtree: true
    });

    chart.draw(view, options);
}

<script src="https://www.gstatic.com/charts/loader.js"></script>
<div id="northPMChart"></div>