谷歌图表中每个条的颜色不同

Question

我正在使用 Google 柱形图 为我的应用程序创建柱形图。我希望能够为每个条设置不同的颜色。我将颜色属性插入到选项变量中，但它不起作用。

谁能帮我解决这个问题？

My fiddle

var options = {
        title: 'Motivation Level Throughout the Day',
        hAxis: {
          title: 'Time of Day',
          format: 'h:mm a',
          viewWindow: {
            min: [7, 30, 0],
            max: [17, 30, 0]
          }
        },
        vAxis: {
          title: 'Rating (scale of 1-10)'
        },
        tooltip: {isHtml: true},
        colors: ['red','yellow', 'blue', 'red','yellow', 'blue', 'red','yellow', 'red','yellow']
      };

Answer 1

colors 配置选项中的每种颜色映射到数据表中的每个系列

一个系列由数据表中x轴列之后的每一列表示

这里，x轴后面只有一个系列/数据表列

[{v: [8, 0, 0], f: '8 am'}, 46],  // <-- one series column
[{v: [9, 0, 0], f: '9 am'}, 46],

为了使用colors，它需要看起来像...

[{v: [8, 0, 0], f: '8 am'}, 46, null, null, null],
[{v: [9, 0, 0], f: '9 am'}, null, 46, null, null],
[{v: [10, 0, 0], f:'10 am'}, null, null, 34, null],
[{v: [11, 0, 0], f: '11 am'}, null, null, null, 4],

相反，我们可以使用'style' 列角色，
这允许我们更改每一行的颜色...

[{v: [8, 0, 0], f: '8 am'}, 46, 'red'],
[{v: [9, 0, 0], f: '9 am'}, 46, 'yellow'],

请参阅以下工作 sn-p，
'style' 列被添加到数据视图中，
颜色是从现有的colors 选项中提取的...

google.charts.load('current', {
  packages: ['corechart']
}).then(drawBasic);

function drawBasic() {
  var dataTable = new google.visualization.DataTable();
  dataTable.addColumn('timeofday', 'Time of Day');
  dataTable.addColumn('number', 'Motivation Level');

  dataTable.addRows([
    [{v: [8, 0, 0], f: '8 am'}, 46],
    [{v: [9, 0, 0], f: '9 am'}, 46],
    [{v: [10, 0, 0], f:'10 am'}, 34],
    [{v: [11, 0, 0], f: '11 am'}, 4],
    [{v: [12, 0, 0], f: '12 pm'}, 5],
    [{v: [13, 0, 0], f: '1 pm'}, 6],
    [{v: [14, 0, 0], f: '2 pm'}, 7],
    [{v: [15, 0, 0], f: '3 pm'}, 8],
    [{v: [16, 0, 0], f: '4 pm'}, 9],
    [{v: [17, 0, 0], f: '5 pm'}, 10],
  ]);

  var options = {
    title: 'Motivation Level Throughout the Day',
    hAxis: {
      title: 'Time of Day',
      format: 'h:mm a',
      viewWindow: {
        min: [7, 30, 0],
        max: [17, 30, 0]
      }
    },
    vAxis: {
      title: 'Rating (scale of 1-10)'
    },
    tooltip: {isHtml: true},
    colors: ['red', 'yellow', 'blue', 'red', 'yellow', 'blue', 'red', 'yellow', 'red', 'yellow'],
    legend: {
      position: 'none'
    }
  };

  // create view with tooltip columns for each series
  var viewColumns = [0];
  var dataView = new google.visualization.DataView(dataTable);
  $.each(new Array(dataTable.getNumberOfColumns()), function (index) {
    // ignore x-axis column
    if (index === 0) {
      return;
    }

    // add series column
    viewColumns.push(index);

    // add tooltip column - column role should directly follow the series it represents
    viewColumns.push({
      calc: function (dt, row) {
        // build tooltip
        var tooltip = '<div class="ggl-tooltip"><div><span>';
        tooltip += dt.getFormattedValue(row, 0) + '</span></div>';
        tooltip += '<div>' + dt.getColumnLabel(index) + ':&nbsp;';
        tooltip += '<span>' + dt.getFormattedValue(row, index) + '</span></div>';
        tooltip += '<div>Add whatever you want for column: ' + index + ', row: ' + row + '</div></div>';

        return tooltip;
      },
      p: {html: true},
      role: 'tooltip',
      type: 'string'
    });

    // add style column for color
    viewColumns.push({
      calc: function (dt, row) {
        // get color based on row index
        return options.colors[row];
      },
      role: 'style',
      type: 'string'
    });
  });
  dataView.setColumns(viewColumns);

  var chart = new google.visualization.ColumnChart(document.getElementById('chart_div'));
  chart.draw(dataView.toDataTable(), options);
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="https://www.gstatic.com/charts/loader.js"></script>
<div id="chart_div"></div>

注意：使用'style' 列角色会使图例无效，
只会显示第一种颜色（第一个系列的颜色）

Answer 2

google.charts.load('current', {packages: ['corechart', 'bar']});
google.charts.setOnLoadCallback(drawBasic);

function drawBasic() {

      var dataTable = new google.visualization.arrayToDataTable([]);
      
      dataTable.addColumn('timeofday', 'Time of Day');
      dataTable.addColumn('number', 'Motivation Level');

      dataTable.addRows([
        [{v: [8, 0, 0], f: '8 am'}, 46],
        [{v: [9, 0, 0], f: '9 am'}, 46],
        [{v: [10, 0, 0], f:'10 am'}, 34],
        [{v: [11, 0, 0], f: '11 am'}, 4],
        [{v: [12, 0, 0], f: '12 pm'}, 5],
        [{v: [13, 0, 0], f: '1 pm'}, 6],
        [{v: [14, 0, 0], f: '2 pm'}, 7],
        [{v: [15, 0, 0], f: '3 pm'}, 8],
        [{v: [16, 0, 0], f: '4 pm'}, 9],
        [{v: [17, 0, 0], f: '5 pm'}, 10],
      ]);
      
      
      var options = {
        title: 'Motivation Level Throughout the Day',
        hAxis: {
          title: 'Time of Day',
          format: 'h:mm a',
          viewWindow: {
            min: [7, 30, 0],
            max: [17, 30, 0]
          }
        },
        vAxis: {
          title: 'Rating (scale of 1-10)'
        },
		tooltip: {isHtml: true},
         colors: ['#FFD700', '#C0C0C0', '#8C7853']
      };



 // create view with tooltip columns for each series
  var viewColumns = [0];
  var dataView = new google.visualization.DataView(dataTable);
  $.each(new Array(dataTable.getNumberOfColumns()), function (index) {
    // ignore x-axis column
    if (index === 0) {
      return;
    }

    // add series column
    viewColumns.push(index);

    // add tooltip column - column role should directly follow the series it represents
    viewColumns.push({
      calc: function (dt, row) {
        // build tooltip
        var tooltip = '<div class="ggl-tooltip"><div><span>';
        tooltip += dt.getFormattedValue(row, 0) + '</span></div>';
        tooltip += '<div>' + dt.getColumnLabel(index) + ':&nbsp;';
        tooltip += '<span>' + dt.getFormattedValue(row, index) + '</span></div>';
        tooltip += '<div>Add whatever you want for column: ' + index + ', row: ' + row + '</div></div>';

        return tooltip;
      },
      p: {html: true},
      role: 'tooltip',
      type: 'string'
    });
  });
  dataView.setColumns(viewColumns); 
	  
	    
      var chart = new google.visualization.ColumnChart(
        document.getElementById('chart_div'));

      chart.draw(dataView.toDataTable(), options);
    }

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js"></script>
<script src="https://www.gstatic.com/charts/loader.js"></script>
<div id="chart_div"></div>