Google图表-树形图

树形图是数据树的可视化表示，每棵节点可以有零个或更多子节点，以及一个父级节点（根除外）。每个节点被显示为一个矩形，可以根据我们分配的值按大小和颜色进行微调。大小和颜色相对于图中的所有其他节点进行评估。下面是树形图的一个示例。我们已经在Google图表配置语法一章中看到用于绘制此图的配置。因此，让我们来看完整的示例。

配置

我们使用了 **TreeMap** 类来显示树形图。

//TreeMap chart
var chart = new google.visualization.TreeMap(document.getElementById('container'));

示例

googlecharts_treemap.htm

实时演示

<html>
   <head>
      <title>Google Charts Tutorial</title>
      <script type = "text/javascript" src = "https://www.gstatic.com/charts/loader.js">
      </script>
      <script type = "text/javascript" src = "https://www.google.com/jsapi">
      </script>
      <script type = "text/javascript">
         google.charts.load('current', {packages: ['treemap']});     
      </script>
   </head>
   
   <body>
      <div id = "container" style = "width: 550px; height: 400px; margin: 0 auto">
      </div>
      <script language = "JavaScript">
         function drawChart() {
            // Define the chart to be drawn.
            var data = new google.visualization.DataTable();
            var data = google.visualization.arrayToDataTable([
               ['Location', 'Parent', 'Market trade volume (size)', 'Market increase/decrease (color)'],
               ['Global',    null,                 0,                               0],
               ['America',   'Global',             0,                               0],
               ['Europe',    'Global',             0,                               0],
               ['Asia',      'Global',             0,                               0],
               ['Australia', 'Global',             0,                               0],
               ['Africa',    'Global',             0,                               0],  
               
               ['USA',       'America',            52,                              31],
               ['Mexico',    'America',            24,                              12],
               ['Canada',    'America',            16,                              -23],
               
               ['France',    'Europe',             42,                              -11],
               ['Germany',   'Europe',             31,                              -2],
               ['Sweden',    'Europe',             22,                              -13],   
               
               ['China',     'Asia',               36,                              4],
               ['Japan',     'Asia',               20,                              -12],
               ['India',     'Asia',               40,                              63],                  
               
               ['Egypt',     'Africa',             21,                              0],          
               ['Congo',     'Africa',             10,                              12],
               ['Zaire',     'Africa',             8,                               10]
            ]);
            var options = {      
               minColor: '#f00',
               midColor: '#ddd',
               maxColor: '#0d0',
               headerHeight: 15,
               fontColor: 'black',
               showScale: true
            };
                  
            // Instantiate and draw the chart.
            var chart = new google.visualization.TreeMap(document.getElementById('container'));
            chart.draw(data, options);
         }
         google.charts.setOnLoadCallback(drawChart);
      </script>
   </body>
</html>

结果

请检查结果。

打印页面