Google 圖表 - 多項式趨勢線

以下是多項式趨勢線圖的一個示例。我們已經在 Google 圖表配置語法一章中看到用於繪製此圖表的配置。所以，讓我們看看完整的示例。

配置

我們使用 trendlines 配置來顯示趨勢線圖。

var options = {
   trendlines: { 0: {
      type: 'polynomial',
      degree: 3,
      visibleInLegend: true,}
   }	  // Draw a trendline for data series 0.
};

示例

googlecharts_trendlines_polynomial.htm

線上演示

<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: ['corechart']});     
      </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();
            data.addColumn('number', 'Age');
            data.addColumn('number', 'Weight');
            data.addRows([
               [ 8,      12],
               [ 4,      5.5],
               [ 11,     14],
               [ 4,      5],
               [ 3,      3.5],
               [ 6.5,    7]
            ]);
               
            // Set chart options
            var options = {
               'title':'Age vs Weight',
               'width':550,
               'height':400,
               'legend': 'none',
               trendlines: { 0: 
                  {
                     type: 'polynomial',
                     degree: 3,
                     visibleInLegend: true,
                  }
               }	// Draw a trendline for data series 0.
            };

            // Instantiate and draw the chart.
            var chart = new google.visualization.ScatterChart(document.getElementById('container'));
            chart.draw(data, options);
         }
         google.charts.setOnLoadCallback(drawChart);
      </script>
   </body>
</html>

結果

驗證結果。

googlecharts_trendlines_charts.htm

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