Google Charts

Visualization: Pie Chart

  1. Overview
  2. A Simple Example
  3. Making a 3D Pie Chart
  4. Making a Donut Chart
  5. Rotating a Pie Chart
  6. Exploding a Slice
  7. Removing Slices
  8. Loading
  9. Data Format
  10. Configuration Options
  11. Methods
  12. Events
  13. Data Policy

Overview

A pie chart that is rendered within the browser using SVG or VML. Displays tooltips when hovering over slices.

Example

Code it yourself on the Visualization Playground

<html>
  <head>
    <script type="text/javascript" src="https://www.google.com/jsapi"></script>
    <script type="text/javascript">
      google.load("visualization", "1", {packages:["corechart"]});
      google.setOnLoadCallback(drawChart);
      function drawChart() {
        var data = google.visualization.arrayToDataTable([
          ['Task', 'Hours per Day'],
          ['Work',     11],
          ['Eat',      2],
          ['Commute',  2],
          ['Watch TV', 2],
          ['Sleep',    7]
        ]);

        var options = {
          title: 'My Daily Activities'
        };

        var chart = new google.visualization.PieChart(document.getElementById('piechart'));
        chart.draw(data, options);
      }
    </script>
  </head>
  <body>
    <div id="piechart" style="width: 900px; height: 500px;"></div>
  </body>
</html>

Making a 3D Pie Chart

If you set the is3D option to true, your pie chart will be drawn as though it has three dimensions:

is3D is false by default, so here we explicitly set it to true:

<html>
  <head>
    <script type="text/javascript" src="https://www.google.com/jsapi"></script>
    <script type="text/javascript">
      google.load("visualization", "1", {packages:["corechart"]});
      google.setOnLoadCallback(drawChart);
      function drawChart() {
        var data = google.visualization.arrayToDataTable([
          ['Task', 'Hours per Day'],
          ['Work',     11],
          ['Eat',      2],
          ['Commute',  2],
          ['Watch TV', 2],
          ['Sleep',    7]
        ]);

        var options = {
          title: 'My Daily Activities',
          is3D: true,
        };

        var chart = new google.visualization.PieChart(document.getElementById('piechart_3d'));
        chart.draw(data, options);
      }
    </script>
  </head>
  <body>
    <div id="piechart_3d" style="width: 900px; height: 500px;"></div>
  </body>
</html>

Making a Donut Chart

A donut chart is a pie chart with a hole in the center. You can create donut charts with the pieHole option:

The pieHole option should be set to a number between 0 and 1, corresponding to the ratio of radii between the hole and the chart. Numbers between 0.4 and 0.6 will look best on most charts. Values equal to or greater than 1 will be ignored, and a value of 0 will completely shut your piehole.

<html>
  <head>
    <script type="text/javascript" src="https://www.google.com/jsapi"></script>
    <script type="text/javascript">
      google.load("visualization", "1", {packages:["corechart"]});
      google.setOnLoadCallback(drawChart);
      function drawChart() {
        var data = google.visualization.arrayToDataTable([
          ['Task', 'Hours per Day'],
          ['Work',     11],
          ['Eat',      2],
          ['Commute',  2],
          ['Watch TV', 2],
          ['Sleep',    7]
        ]);

        var options = {
          title: 'My Daily Activities',
          pieHole: 0.4,
        };

        var chart = new google.visualization.PieChart(document.getElementById('donutchart'));
        chart.draw(data, options);
      }
    </script>
  </head>
  <body>
    <div id="donutchart" style="width: 900px; height: 500px;"></div>
  </body>
</html>

You can't combine the pieHole and is3D options; if you do, pieHole will be ignored.

Rotating a Pie Chart

By default, pie charts begin with the left edge of the first slice pointing straight up. You can change that with the pieStartAngle option:

Here, we rotate the chart clockwise 100 degrees with an option of pieStartAngle: 100. (So chosen because that particular angle happens to make the "Italian" label fit inside the slice.)

<html>
  <head>
    <script type="text/javascript" src="https://www.google.com/jsapi"></script>
    <script type="text/javascript">
      google.load("visualization", "1", {packages:["corechart"]});
      google.setOnLoadCallback(drawChart);
      function drawChart() {
        var data = google.visualization.arrayToDataTable([
          ['Language', 'Speakers (in millions)'],
          ['German',  5.85],
          ['French',  1.66],
          ['Italian', 0.316],
          ['Romansh', 0.0791],
        ]);

      var options = {
        legend: 'none',
        pieSliceText: 'label',
        title: 'Swiss Language Use (100 degree rotation)',
        pieStartAngle: 100,
      };

        var chart = new google.visualization.PieChart(document.getElementById('piechart'));
        chart.draw(data, options);
      }
    </script>
  </head>
  <body>
    <div id="piechart" style="width: 900px; height: 500px;"></div>
  </body>
</html>

Exploding a Slice

You can separate pie slices from the rest of the chart with the offset property of the slices option: To separate a slice, create a slices object and assign the appropriate slice number an offset between 0 and 1. Below, we assign progressively larger offsets to slices 4 (Gujarati), 12 (Marathi), 14 (Oriya), and 15 (Punjabi):

<html>
  <head>
    <script type="text/javascript" src="https://www.google.com/jsapi"></script>
    <script type="text/javascript">
      google.load("visualization", "1", {packages:["corechart"]});
      google.setOnLoadCallback(drawChart);
      function drawChart() {
        var data = google.visualization.arrayToDataTable([
          ['Language', 'Speakers (in millions)'],
          ['Assamese', 13], ['Bengali', 83], ['Bodo', 1.4],
          ['Dogri', 2.3], ['Gujarati', 46], ['Hindi', 300],
          ['Kannada', 38], ['Kashmiri', 5.5], ['Konkani', 5],
          ['Maithili', 20], ['Malayalam', 33], ['Manipuri', 1.5],
          ['Marathi', 72], ['Nepali', 2.9], ['Oriya', 33],
          ['Punjabi', 29], ['Sanskrit', 0.01], ['Santhali', 6.5],
          ['Sindhi', 2.5], ['Tamil', 61], ['Telugu', 74], ['Urdu', 52],
        ]);

        var options = {
          title: 'Indian Language Use',
          legend: 'none',
          pieSliceText: 'label',
          slices: {  4: {offset: 0.2},
                    12: {offset: 0.3},
                    14: {offset: 0.4},
                    15: {offset: 0.5},
          },
        };

        var chart = new google.visualization.PieChart(document.getElementById('piechart'));
        chart.draw(data, options);
      }
    </script>
  </head>
  <body>
    <div id="piechart" style="width: 900px; height: 500px;"></div>
  </body>
</html>

Removing Slices

To omit a slice, change the color to 'transparent':

We also used the pieStartAngle to rotate the chart 135 degrees, pieSliceText to remove the text from the slices, and tooltip.trigger to disable tooltips:

<html>
  <head>
    <script type="text/javascript" src="https://www.google.com/jsapi"></script>
    <script type="text/javascript">
      google.load("visualization", "1", {packages:["corechart"]});
      google.setOnLoadCallback(drawChart);
      function drawChart() {
        var data = google.visualization.arrayToDataTable([
          ['Pac Man', 'Percentage'],
          ['', 75],
          ['', 25],
        ]);

        var options = {
          legend: 'none',
          pieSliceText: 'none',
          pieStartAngle: 135,
          tooltip: { trigger: 'none' },
          slices: {
            0: { color: 'yellow' },
            1: { color: 'transparent' }
          }
        };

        var chart = new google.visualization.PieChart(document.getElementById('pacman'));
        chart.draw(data, options);
      }
    </script>
  </head>
  <body>
    <div id="pacman" style="width: 900px; height: 500px;"></div>
  </body>
</html>

Loading

The google.load package name is "corechart".

  google.load("visualization", "1", {packages: ["corechart"]});

The visualization's class name is google.visualization.PieChart.

  var visualization = new google.visualization.PieChart(container);

Data Format

Rows: Each row in the table represents a slice.

Columns:

  Column 0 Column 1
Purpose: Slice labels Slice values
Data Type: string number
Role: domain data
Optional column roles: None None

Configuration Options

Name Type Default Description
backgroundColor string or object 'white' The background color for the main area of the chart. Can be either a simple HTML color string, for example: 'red' or '#00cc00', or an object with the following properties.
backgroundColor.stroke string '#666' The color of the chart border, as an HTML color string.
backgroundColor.strokeWidth number 0 The border width, in pixels.
backgroundColor.fill string 'white' The chart fill color, as an HTML color string.
chartArea Object null An object with members to configure the placement and size of the chart area (where the chart itself is drawn, excluding axis and legends). Two formats are supported: a number, or a number followed by %. A simple number is a value in pixels; a number followed by % is a percentage. Example: chartArea:{left:20,top:0,width:"50%",height:"75%"}
chartArea.left number or string auto How far to draw the chart from the left border.
chartArea.top number or string auto How far to draw the chart from the top border.
chartArea.width number or string auto Chart area width.
chartArea.height number or string auto Chart area height.
colors Array of strings default colors The colors to use for the chart elements. An array of strings, where each element is an HTML color string, for example: colors:['red','#004411'].
enableInteractivity boolean true Whether the chart throws user-based events or reacts to user interaction. If false, the chart will not throw 'select' or other interaction-based events (but will throw ready or error events), and will not display hovertext or otherwise change depending on user input.
fontSize number automatic The default font size, in pixels, of all text in the chart. You can override this using properties for specific chart elements.
fontName string 'Arial' The default font face for all text in the chart. You can override this using properties for specific chart elements.
forceIFrame boolean false Draws the chart inside an inline frame. (Note that on IE8, this option is ignored; all IE8 charts are drawn in i-frames.)
height number height of the containing element Height of the chart, in pixels.
is3D boolean false If true, displays a three-dimensional chart.
legend Object null

An object with members to configure various aspects of the legend. To specify properties of this object, you can use object literal notation, as shown here:

{position: 'top', textStyle: {color: 'blue', fontSize: 16}}
legend.alignment string automatic Alignment of the legend. Can be one of the following:
  • 'start' - Aligned to the start of the area allocated for the legend.
  • 'center' - Centered in the area allocated for the legend.
  • 'end' - Aligned to the end of the area allocated for the legend.

Start, center, and end are relative to the style -- vertical or horizontal -- of the legend. For example, in a 'right' legend, 'start' and 'end' are at the top and bottom, respectively; for a 'top' legend, 'start' and 'end' would be at the left and right of the area, respectively.

The default value depends on the legend's position. For 'bottom' legends, the default is 'center'; other legends default to 'start'.

legend.position string 'right' Position of the legend. Can be one of the following:
  • 'bottom' - Displays the legend below the chart.
  • 'labeled' - Draws lines connecting slices to their data values.
  • 'left' - Displays the legend left of the chart.
  • 'none' - Displays no legend.
  • 'right' - Displays the legend right of the chart.
  • 'top' - Displays the legend above the chart.
legend.maxLines number 1

Maximum number of lines in the legend. Set this to a number greater than one to add lines to your legend. Note: The exact logic used to determine the actual number of lines rendered is still in flux.

This option currently works only when legend.position is 'top'.

legend.textStyle Object {color: 'black', fontName: <global-font-name>, fontSize: <global-font-size>}

An object that specifies the legend text style. The object has this format:

{ color: <string>,
  fontName: <string>,
  fontSize: <number>,
  bold: <boolean>,
  italic: <boolean> }

The color can be any HTML color string, for example: 'red' or '#00cc00'. Also see fontName and fontSize.

pieHole number 0 If between 0 and 1, displays a donut chart. The hole with have a radius equal to number times the radius of the chart.
pieSliceBorderColor string 'white' The color of the slice borders. Only applicable when the chart is two-dimensional.
pieSliceText string 'percentage' The content of the text displayed on the slice. Can be one of the following:
  • 'percentage' - The percentage of the slice size out of the total.
  • 'value' - The quantitative value of the slice.
  • 'label' - The name of the slice.
  • 'none' - No text is displayed.
pieSliceTextStyle Object {color: 'black', fontName: <global-font-name>, fontSize: <global-font-size>}

An object that specifies the slice text style. The object has this format:

 {color: <string>, fontName: <string>, fontSize: <number>}

The color can be any HTML color string, for example: 'red' or '#00cc00'. Also see fontName and fontSize.

pieStartAngle Number 0

The angle, in degrees, to rotate the chart by. The default of 0 will orient the leftmost edge of the first slice directly up.

reverseCategories boolean false If true, draws slices counterclockwise. The default is to draw clockwise.
pieResidueSliceColor string '#ccc' Color for the combination slice that holds all slices below sliceVisibilityThreshold.
pieResidueSliceLabel string 'Other' A label for the combination slice that holds all slices below sliceVisibilityThreshold.
slices Array of objects, or object with nested objects {}

An array of objects, each describing the format of the corresponding slice in the pie. To use default values for a slice, specify an empty object (i.e., {}). If a slice or a value is not specified, the global value will be used. Each object supports the following properties:

  • color - The color to use for this slice. Specify a valid HTML color string.
  • offset - How far to separate the slice from the rest of the pie, from 0.0 (not at all) to 1.0 (the pie's radius).
  • textStyle - Overrides the global pieSliceTextSlice for this slice.

You can specify either an array of objects, each of which applies to the slice in the order given, or you can specify an object where each child has a numeric key indicating which slice it applies to. For example, the following two declarations are identical, and declare the first slice as black and the fourth as red:

slices: [{color: 'black', {}, {}, {color: 'red'}]
slices: {0: {color: 'black'}, 3: {color: 'red'}}
sliceVisibilityThreshold number 1/720 The slice relative part, below which a slice will not show individually. All slices that have not passed this threshold will be combined to a single slice, whose size is the sum of all their sizes. Default is not to show individually any slice which is smaller than half a degree.
title string no title Text to display above the chart.
titleTextStyle Object {color: 'black', fontName: <global-font-name>, fontSize: <global-font-size>}

An object that specifies the title text style. The object has this format:

{ color: <string>,
  fontName: <string>,
  fontSize: <number>,
  bold: <boolean>,
  italic: <boolean> }

The color can be any HTML color string, for example: 'red' or '#00cc00'. Also see fontName and fontSize.

tooltip Object null

An object with members to configure various tooltip elements. To specify properties of this object, you can use object literal notation, as shown here:

 {textStyle: {color: '#FF0000'}, showColorCode: true}
tooltip.showColorCode boolean false If true, show colored squares next to the slice information in the tooltip.
tooltip.text string 'both'

What information to display when the user hovers over a pie slice. The following values are supported:

  • 'both' - [Default] Display both the absolute value of the slice and the percentage of the whole.
  • 'value' - Display only the absolute value of the slice.
  • 'percentage' - Display only the percentage of the whole represented by the slice.
tooltip.textStyle Object {color: 'black', fontName: <global-font-name>, fontSize: <global-font-size>}

An object that specifies the tooltip text style. The object has this format:

{ color: <string>,
  fontName: <string>,
  fontSize: <number>,
  bold: <boolean>,
  italic: <boolean> }

The color can be any HTML color string, for example: 'red' or '#00cc00'. Also see fontName and fontSize.

tooltip.trigger string 'focus'

The user interaction that causes the tooltip to be displayed:

  • 'focus' - The tooltip will be displayed when the user hovers over an element.
  • 'none' - The tooltip will not be displayed.
width number width of the containing element Width of the chart, in pixels.

Methods

Method Return Type Description
draw(data, options) none Draws the chart. The chart accepts further method calls only after the ready event is fired. Extended description.
getBoundingBox(id) Object

Returns an object containing the left, top, width, and height of chart element id. The format for id isn't yet documented (they're the return values of event handlers), but here are some examples:

var cli = chart.getChartLayoutInterface();

Height of the chart area
cli.getBoundingBox('chartarea').height
Width of the third bar in the first series of a bar or column chart
cli.getBoundingBox('bar#0#2').width
Bounding box of the fifth wedge of a pie chart
cli.getBoundingBox('slice#4')
Bounding box of the chart data of a vertical (e.g., column) chart:
cli.getBoundingBox('vAxis#0#gridline')
Bounding box of the chart data of a horizontal (e.g., bar) chart:
cli.getBoundingBox('hAxis#0#gridline')

Values are relative to the container of the chart. Call this after the chart is drawn.

getChartAreaBoundingBox() Object

Returns an object containing the left, top, width, and height of the chart content (i.e., excluding labels and legend):

var cli = chart.getChartLayoutInterface();

cli.getChartAreaBoundingBox().left
cli.getChartAreaBoundingBox().top
cli.getChartAreaBoundingBox().height
cli.getChartAreaBoundingBox().width

Values are relative to the container of the chart. Call this after the chart is drawn.

getChartLayoutInterface() Object

Returns an object containing information about the onscreen placement of the chart and its elements.

The following methods can be called on the returned object:

  • getBoundingBox
  • getChartAreaBoundingBox
  • getHAxisValue
  • getVAxisValue
  • getXLocation
  • getYLocation

Call this after the chart is drawn.

getHAxisValue(position, optional_axis_index) Number

Returns the logical horizontal value at position, which is an offset from the chart container's left edge. Can be negative.

Example: chart.getChartLayoutInterface().getHAxisValue(400).

Call this after the chart is drawn.

getImageURI() String

Returns the chart serialized as an image URI.

Call this after the chart is drawn.

See Printing PNG Charts.

getSelection() Array of selection elements Returns an array of the selected chart entities. Selectable entities are slices and legend entries. A slice or legend entry correlates to a row in the data table (column index is null). For this chart, only one entity can be selected at any given moment. Extended description.
getVAxisValue(position, optional_axis_index) Number

Returns the logical vertical value at position, which is an offset from the chart container's top edge. Can be negative.

Example: chart.getChartLayoutInterface().getVAxisValue(300).

Call this after the chart is drawn.

getXLocation(position, optional_axis_index) Number

Returns the screen x-coordinate of position relative to the chart's container.

Example: chart.getChartLayoutInterface().getXLocation(400).

Call this after the chart is drawn.

getYLocation(position, optional_axis_index) Number

Returns the screen y-coordinate of position relative to the chart's container.

Example: chart.getChartLayoutInterface().getYLocation(300).

Call this after the chart is drawn.

setSelection() none Selects the specified chart entities. Cancels any previous selection. Selectable entities are slices and legend entries. A slice or legend entry correlates to a row in the data table (column index is null). For this chart, only one entity can be selected at a time. Extended description.
clearChart() none Clears the chart, and releases all of its allocated resources.

Events

For more information on how to use these events, see Basic Interactivity, Handling Events, and Firing Events.

Name Description Properties
animationfinish Fired when transition animation is complete. None
error Fired when an error occurs when attempting to render the chart. id, message
onmouseover Fired when the user mouses over a visual entity. Passes back the row and column indices of the corresponding data table element. A slice or legend entry correlates to a row in the data table (column index is null). row, column
onmouseout Fired when the user mouses away from a visual entity. Passes back the row and column indices of the corresponding data table element. A slice or legend entry correlates to a row in the data table (column index is null). row, column
ready The chart is ready for external method calls. If you want to interact with the chart, and call methods after you draw it, you should set up a listener for this event before you call the draw method, and call them only after the event was fired. None
select Fired when the user clicks a visual entity. To learn what has been selected, call getSelection(). None

Data Policy

All code and data are processed and rendered in the browser. No data is sent to any server.

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