使用Google Chart API注释栏

时间:2013-05-13 16:35:34

标签: google-visualization

我正在尝试向水平条添加注释,类似于附加图表图像中的注释。 [例如:条形'1'的注释是“7.4%(+ 2.4 / -199)”,条形图'3'是“11.7%(+ 2.9 / -2.4)”,图像中的平均垂直线条表示]

我使用了一个条形图并配置了它来渲染条形和间隔的选项。但是,从Google Charts API文档中,条形图在其角色中不支持Annotation / AnnotationText。

我必须从Google Chart API中选择哪个图表? 我必须配置哪些选项来标记注释? 有没有使用Google Chart API解释此问题的示例?

该图片摘自Google消费者调查页(http://www.google.com/insights/consumersurveys/view?survey=xirgjukonszvg&question=9&subpop&subpop)。

谢谢!

Bar Chart example

2 个答案:

答案 0 :(得分:4)

目前无法创建Google可视化中显示的图表。您可以使用DataTable Roles创建错误栏,但BarChart不支持注释(这意味着您不能在图表上显示文字,如您发布的示例中所示)。

你可以摆弄ComboChart,它可以支持注释,但是你会遇到柱形图(而不是条形图)。

以下是条形图的代码:

function drawVisualization() {
  // Create and populate the data table.
  var data = new google.visualization.DataTable();
  data.addColumn({type:'string', label:'label'});
  data.addColumn({type:'number', label:'value', pattern:'#.#%'});
  data.addColumn({type:'number', role:'interval', pattern:'#.#%'});  // interval role col.
  data.addColumn({type:'number', role:'interval', pattern:'#.#%'});  // interval role col.
  data.addColumn({type:'string', role:'annotation'}); // annotation role col. -- not enabled for bar charts
  data.addColumn({type:'string', role:'annotationText'}); // annotationText col. -- not enabled for bar charts
  data.addRows([
    ['1', 0.074, 0.055, 0.098, 'A', '7.4% (-1.9/2.4)'],
    ['2', 0.04, 0.027, 0.059, 'B', '4.0% (-1.3/1.9)'],
    ['3', 0.117, 0.093, 0.146, 'C', '11.7% (-2.4/2.9)'],
    ['4', 0.217, 0.185, 0.252, 'D', '21.7% (-3.2/3.5)'],
    ['5', 0.552, 0.511, 0.592, 'E', '55.2% (-4.1/4.0)'],
  ]);

  // Create and draw the visualization.
  new google.visualization.BarChart(document.getElementById('visualization')).
    draw(data,
         {title:"SubPopulation B",
          width:600, height:400,
          vAxis: {title: "Importance"},
          hAxis: {title: "Percent", format:'#%'},
         }
        );
}

以下是comboChart版本的代码:

function drawVisualization() {
  // Create and populate the data table.
  var data = new google.visualization.DataTable();
  data.addColumn({type:'string', label:'label'});
  data.addColumn({type:'number', label:'value', pattern:'#.#%'});
  data.addColumn({type:'number', label:'line', pattern:'#.#%'});
  data.addColumn({type:'number', role:'interval', pattern:'#.#%'});  // interval role col.
  data.addColumn({type:'number', role:'interval', pattern:'#.#%'});  // interval role col.
  data.addColumn({type:'string', role:'annotation'}); // annotation role col. -- not enabled for bar charts
  data.addColumn({type:'string', role:'annotationText'}); // annotationText col. -- not enabled for bar charts
  data.addRows([
    ['1', 0.074, 0.074, 0.055, 0.098, '7.4% (-1.9/2.4)', '7.4% (-1.9/2.4)'],
    ['2', 0.040, 0.040, 0.027, 0.059, '4.0% (-1.3/1.9)', '4.0% (-1.3/1.9)'],
    ['3', 0.117, 0.117, 0.093, 0.146, '11.7% (-2.4/2.9)', '11.7% (-2.4/2.9)'],
    ['4', 0.217, 0.217, 0.185, 0.252, '21.7% (-3.2/3.5)', '21.7% (-3.2/3.5)'],
    ['5', 0.552, 0.552, 0.511, 0.592, '55.2% (-4.1/4.0)', '55.2% (-4.1/4.0)'],
  ]);

  // Create and draw the visualization.
  var ac = new google.visualization.ComboChart(document.getElementById('visualization'));
  ac.draw(data, {
    title : 'Subpopulation B',
    width: 600,
    height: 400,
    vAxis: {title: "Percentage", format:'#%'},
    hAxis: {title: "Importance"},
    seriesType: "bars",
    series: {1: {type: "line"}}
  });
}

您可以使用选项隐藏线条,并使其看起来更漂亮,但一般来说它看起来相似(它不像您的样本那么漂亮)。

如果这些都不适合您,那么您需要编写自定义javascript以手动向BarChart添加工具提示(注释)。我不知道如何(因为我不是javascript专家),所以如果上述解决方法不够好,我会留给你的。

答案 1 :(得分:1)

看看这个小提琴:http://jsfiddle.net/augustomen/FE2nh/

使用列系列成功设法将标签放在ComboChart之上。如果很少适应,您可以将标签放在栏前面左对齐

'魔术'部分就是这样:

    /* Here comes the hack!
    We're going to add a svg text element to each column bar.
    This code will work for this data setup only. If you add/remove a series, this code must be adapted
    */    
    rects = mydiv.find('svg > g > g > g > rect');
    var row = 0;
    for (i = 0; i < rects.length; i++) {
        // this selector also retrieves gridlines
        // we're excluding them by height
        el = $(rects[i]);
        if (parseFloat(el.attr("height")) <= 2) { continue; }
        aparent = el.parent();
        do { // skips 'null' values
            text = data.getValue(row++, 1);
        } while (text == null && row < data.getNumberOfRows());

        if (text) {
            text = formatter.formatValue(text);
            // see below
            pos = getElementPos(el);
            attrs = {x: pos.x + pos.width / 2, y: pos.y - 2,
                     fill: 'black', 'font-family': 'Arial', 'font-size': 11, 'text-anchor': 'middle'};
            aparent.append(addTextNode(attrs, text, aparent));
        }
    }

function getElementPos($el) {
    // returns an object with the element position
    return {
        x: parseFloat($el.attr("x")),
        width: parseFloat($el.attr("width")),
        y: parseFloat($el.attr("y")),
        height: parseFloat($el.attr("height"))
    }
}

function addTextNode(attrs, text, _element) {
    // creates an svg text node
  var el = document.createElementNS('http://www.w3.org/2000/svg', "text");
  for (var k in attrs) { el.setAttribute(k, attrs[k]); }
  var textNode = document.createTextNode(text);
  el.appendChild(textNode);
  return el;
}