Google Charts

Visualization: Bubble Chart

  1. Overview
  2. Example
  3. Loading
  4. Data Format
  5. Configuration Options
  6. Methods
  7. Events
  8. Data Policy

Overview

A bubble chart that is rendered within the browser using SVG or VML. Displays tips when hovering over bubbles.

A bubble chart is used to visualize a data set with two to four dimensions. The first two dimensions are visualized as coordinates, the third as color and the fourth as size.

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([
          ['ID', 'Life Expectancy', 'Fertility Rate', 'Region',     'Population'],
          ['CAN',    80.66,              1.67,      'North America',  33739900],
          ['DEU',    79.84,              1.36,      'Europe',         81902307],
          ['DNK',    78.6,               1.84,      'Europe',         5523095],
          ['EGY',    72.73,              2.78,      'Middle East',    79716203],
          ['GBR',    80.05,              2,         'Europe',         61801570],
          ['IRN',    72.49,              1.7,       'Middle East',    73137148],
          ['IRQ',    68.09,              4.77,      'Middle East',    31090763],
          ['ISR',    81.55,              2.96,      'Middle East',    7485600],
          ['RUS',    68.6,               1.54,      'Europe',         141850000],
          ['USA',    78.09,              2.05,      'North America',  307007000]
        ]);

        var options = {
          title: 'Correlation between life expectancy, fertility rate and population of some world countries (2010)',
          hAxis: {title: 'Life Expectancy'},
          vAxis: {title: 'Fertility Rate'},
          bubble: {textStyle: {fontSize: 11}}
        };

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

Gradient-Color Example

<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([
          ['ID', 'X', 'Y', 'Temperature'],
          ['',   80,  167,      120],
          ['',   79,  136,      130],
          ['',   78,  184,      50],
          ['',   72,  278,      230],
          ['',   81,  200,      210],
          ['',   72,  170,      100],
          ['',   68,  477,      80]
        ]);

        var options = {
          colorAxis: {colors: ['yellow', 'red']}
        };

        var chart = new google.visualization.BubbleChart(document.getElementById('chart_div'));
        chart.draw(data, options);
      }
    </script>
  </head>
  <body>
    <div id="chart_div" 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.BubbleChart

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

Data Format

Rows: Each row in the table represents a single bubble.

Columns:

  Column 0 Column 1 Column 2 Column 3 (optional) Column 4 (optional)
Purpose: ID (name) of the bubble X coordinate Y coordinate Either a series ID or a value representing a color on a gradient scale, depending on the column type:
  • string
    A string that identifies bubbles in the same series. Use the same value to identify all bubbles that belong to the same series; bubbles in the same series will be assigned the same color. Series can be configured using the series option.
  • number
    A value that is mapped to an actual color on a gradient scale using the colorAxis option.
Size; values in this column are mapped to actual pixel values using the sizeAxis option.
Data Type: string number number string or number number

Configuration Options

Name Type Default Description
animation.duration number 0 The duration of the animation, in milliseconds. For details, see the animation documentation.
animation.easing string 'linear' The easing function applied to the animation. The following options are available:
  • 'linear' - Constant speed.
  • 'in' - Ease in - Start slow and speed up.
  • 'out' - Ease out - Start fast and slow down.
  • 'inAndOut' - Ease in and out - Start slow, speed up, then slow down.
axisTitlesPosition string 'out'

Where to place the axis titles, compared to the chart area. Supported values:

  • in - Draw the axis titles inside the the chart area.
  • out - Draw the axis titles outside the chart area.
  • none - Omit the axis titles.
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.
bubble Object null An object with members to configure the visual properties of the bubbles.
bubble.opacity number, 0.0–1.0 0.8 The opacity of the bubbles, where 0 is fully transparent and 1 is fully opaque.
bubble.stroke string '#ccc' The color of the bubbles' stroke.
bubble.textStyle Object {color: 'black', fontName: <global-font-name>, fontSize: <global-font-size>}

An object that specifies the bubble 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.

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'].
colorAxis Object null An object that specifies a mapping between color column values and colors or a gradient scale. To specify properties of this object, you can use object literal notation, as shown here:

 {minValue: 0,  colors: ['#FF0000', '#00FF00']}
colorAxis.minValue number Minimum value of color column in chart data. If present, specifies a minimum value for chart color data. Color data values of this value and lower will be rendered as the first color in the colorAxis.colors range.
colorAxis.maxValue number Maximum value of color column in chart data If present, specifies a maximum value for chart color data. Color data values of this value and higher will be rendered as the last color in the colorAxis.colors range.
colorAxis.values array of numbers null If present, controls how values are associated with colors. Each value is associated with the corresponding color in the colorAxis.colors array. These values apply to the chart color data. Coloring is done according to a gradient of the values specified here. Not specifying a value for this option is equivalent to specifying [minValue, maxValue].
colorAxis.colors array of color strings null Colors to assign to values in the visualization. An array of strings, where each element is an HTML color string, for example: colorAxis: {colors:['red','#004411']}. You must have at least two values; the gradient will include all your values, plus calculated intermediary values, with the first color as the smallest value, and the last color as the highest.
colorAxis.legend Object null An object that specifies the style of the gradient color legend.
colorAxis.legend.position Object 'top' Position of the legend. Can be one of the following:
  • 'top' - Above the chart.
  • 'bottom' - Below the chart.
  • 'in' - Inside the chart, at the top.
  • 'none' - No legend is displayed.
colorAxis.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>}

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

colorAxis.legend.numberFormat string auto A format string for numeric labels. This is a subset of the ICU pattern set. For instance, {numberFormat:'.##'} will display values "10.66", "10.6", and "10.0" for values 10.666, 10.6, and 10.
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.
explorer Object null The explorer option allows users to pan and zoom Google charts. explorer: {} provides the default explorer behavior, enabling users to pan horizontally and vertically by dragging, and to zoom in and out by scrolling.

This feature is experimental and may change in future releases.
explorer.actions Array of strings ['dragToPan', 'rightClickToReset'] The Google Charts explorer supports three actions:

  • dragToPan: Drag to pan around the chart horizontally and vertically. To pan only along the horizontal axis, use explorer: { axis: 'horizontal' }. Similarly for the vertical axis.

  • dragToZoom: The explorer's default behavior is to zoom in and out when the user scrolls.

    If explorer: { actions: ['dragToZoom', 'rightClickToReset'] } is used, dragging across a rectangular area zooms into that area.

    We recommend using rightClickToReset whenever dragToZoom is used. See explorer.maxZoomIn, explorer.maxZoomOut, and explorer.zoomDelta for zoom customizations.

  • rightClickToReset: Right clicking on the chart returns it to the original pan and zoom level.
explorer.axis string both horizontal and vertical panning By default, users can pan both horizontally and vertically when the explorer option is used. If you want to users to only pan horizontally, use explorer: { axis: 'horizontal' }. Similarly, explorer: { axis: 'vertical' } enables vertical-only panning.
explorer.keepInBounds boolean false By default, users can pan all around, regardless of where the data is. To ensure that users don't pan beyond the original chart, use explorer: { keepInBounds: true }.
explorer.maxZoomIn number 0.25 The maximum that the explorer can zoom in. By default, users will be able to zoom in enough that they'll see only 25% of the original view. Setting explorer: { maxZoomIn: .5 } would let users zoom in only far enough to see half of the original view.
explorer.maxZoomOut number 4 The maximum that the explorer can zoom out. By default, users will be able to zoom out far enough that the chart will take up only 1/4 of the available space. Setting explorer: { maxZoomOut: 8 } would let users zoom out far enough that the chart would take up only 1/8 of the available space.
explorer.zoomDelta number 1.5 When users zoom in or out, explorer.zoomDelta determines how much they zoom by. The smaller the number, the smoother and slower the zoom.
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.)
hAxis Object null

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

 {title: 'Hello',  titleTextStyle: {color: '#FF0000'}}
hAxis.baseline number automatic The baseline for the horizontal axis.
hAxis.baselineColor number 'black' The color of the baseline for the horizontal axis. Can be any HTML color string, for example: 'red' or '#00cc00'.
hAxis.direction 1 or -1 1 The direction in which the values along the horizontal axis grow. Specify -1 to reverse the order of the values.
hAxis.format string auto A format string for numeric axis labels. This is a subset of the ICU pattern set. For instance, {format:'#,###%'} will display values "1,000%", "750%", and "50%" for values 10, 7.5, and 0.5.

The actual formatting applied to the label is derived from the locale the API has been loaded with. For more details, see loading charts with a specific locale.

hAxis.gridlines Object null

An object with members to configure the gridlines on the horizontal axis. To specify properties of this object, you can use object literal notation, as shown here:

 {color: '#333', count: 4}
hAxis.gridlines.color string '#CCC' The color of the horizontal gridlines inside the chart area. Specify a valid HTML color string.
hAxis.gridlines.count number 5 The number of horizontal gridlines inside the chart area. Minimum value is 2. Specify -1 to automatically compute the number of gridlines.
hAxis.minorGridlines Object null An object with members to configure the minor gridlines on the horizontal axis, similar to the hAxis.gridlines option.
hAxis.minorGridlines.color string A blend of the gridline and background colors The color of the horizontal minor gridlines inside the chart area. Specify a valid HTML color string.
hAxis.minorGridlines.count number 0 The number of horizontal minor gridlines between two regular gridlines.
hAxis.logScale boolean false hAxis property that makes the horizontal axis a logarithmic scale (requires all values to be positive). Set to true for yes.
hAxis.textPosition string 'out'

Position of the horizontal axis text, relative to the chart area. Supported values: 'out', 'in', 'none'.

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

An object that specifies the horizontal axis 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.

hAxis.ticks Array of elements auto

Replaces the automatically generated X-axis ticks with the specified array. Each element of the array should be either a valid tick value (such as a number, date, datetime, or timeofday), or an object. If it's an object, it should have a v property for the tick value, and an optional f property containing the literal string to be displayed as the label.

Examples:

  • hAxis: { ticks: [5,10,15,20] }
  • hAxis: { ticks: [{v:32, f:"thirty two"}, {v:64, f:"sixty four"}] }
  • hAxis: { ticks: [new Date(2014,3,15), new Date(2013,5,15)] }
  • hAxis: { ticks: [16, {v:32, f:"thirty two"}, {v:64, f:"sixty four"}, 128] }

hAxis.title string null hAxis property that specifies the title of the horizontal axis.
hAxis.titleTextStyle Object {color: 'black', fontName: <global-font-name>, fontSize: <global-font-size>}

An object that specifies the horizontal axis 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.

hAxis.maxValue number automatic Moves the max value of the horizontal axis to the specified value; this will be rightward in most charts. Ignored if this is set to a value smaller than the maximum x-value of the data. hAxis.viewWindow.max overrides this property.
hAxis.minValue number automatic Moves the min value of the horizontal axis to the specified value; this will be leftward in most charts. Ignored if this is set to a value greater than the minimum x-value of the data. hAxis.viewWindow.min overrides this property.
hAxis.viewWindowMode string Equivalent to 'pretty', but haxis.viewWindow.min and haxis.viewWindow.max take precedence if used.

Specifies how to scale the horizontal axis to render the values within the chart area. The following string values are supported:

  • 'pretty' - Scale the horizontal values so that the maximum and minimum data values are rendered a bit inside the left and right of the chart area. This will cause haxis.viewWindow.min and haxis.viewWindow.max to be ignored.
  • 'maximized' - Scale the horizontal values so that the maximum and minimum data values touch the left and right of the chart area. This will cause haxis.viewWindow.min and haxis.viewWindow.max to be ignored.
  • 'explicit' - A deprecated option for specifying the left and right scale values of the chart area. (Deprecated because it's redundant with haxis.viewWindow.min and haxis.viewWindow.max.) Data values outside these values will be cropped. You must specify an hAxis.viewWindow object describing the maximum and minimum values to show.
hAxis.viewWindow Object null Specifies the cropping range of the horizontal axis.
hAxis.viewWindow.max number auto The maximum horizontal data value to render.
Ignored when hAxis.viewWindowMode is 'pretty' or 'maximized'.
hAxis.viewWindow.min number auto The minimum horizontal data value to render.
Ignored when hAxis.viewWindowMode is 'pretty' or 'maximized'.
height number height of the containing element Height of the chart, in pixels.
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.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.position string 'right' Position of the legend. Can be one of the following:
  • 'bottom' - Below the chart.
  • 'left' - To the left of the chart, provided the left axis has no series associated with it. So if you want the legend on the left, use the option targetAxisIndex: 1.
  • 'in' - Inside the chart, by the top left corner.
  • 'none' - No legend is displayed.
  • 'right' - To the right of the chart. Incompatible with the vAxes option.
  • 'top' - Above the chart.
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.

selectionMode string 'single' When selectionMode is 'multiple', users may select multiple data points.
series Object with nested objects {}

An object of objects, where the keys are series names (the values in the Color column) and each object describing the format of the corresponding series in the chart. If a series 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 series. Specify a valid HTML color string.
  • visibleInLegend - A boolean value, where true means that the series should have a legend entry, and false means that it should not. Default is true.
Example:
series: {'Europe': {color: 'green'}}
sizeAxis Object null An object with members to configure how values are associated with bubble size. To specify properties of this object, you can use object literal notation, as shown here:

 {minValue: 0,  maxSize: 20}
sizeAxis.maxSize number 30 Maximum radius of the largest possible bubble, in pixels.
sizeAxis.maxValue number Maximum value of size column in chart data The size value (as appears in the chart data) to be mapped to sizeAxis.maxSize. Larger values will be cropped to this value.
sizeAxis.minSize number 5 Mininum radius of the smallest possible bubble, in pixels.
sizeAxis.minValue number Minimum value of size column in chart data The size value (as appears in the chart data) to be mapped to sizeAxis.minSize. Smaller values will be cropped to this value.
sortBubblesBySize boolean true If true, sorts the bubbles by size so the smaller bubbles appear above the larger bubbles. If false, bubbles are sorted according to their order in the DataTable.
theme string null A theme is a set of predefined option values that work together to achieve a specific chart behavior or visual effect. Currently only one theme is available:
  • 'maximized' - Maximizes the area of the chart, and draws the legend and all of the labels inside the chart area. Sets the following options:
    chartArea: {width: '100%', height: '100%'},
    legend: {position: 'in'},
    titlePosition: 'in', axisTitlesPosition: 'in',
    hAxis: {textPosition: 'in'}, vAxis: {textPosition: 'in'}
title string no title Text to display above the chart.
titlePosition string 'out'

Where to place the chart title, compared to the chart area. Supported values:

  • in - Draw the title inside the chart area.
  • out - Draw the title outside the chart area.
  • none - Omit the title.
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.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.
vAxis Object null

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

 {title: 'Hello', titleTextStyle: {color: '#FF0000'}}
vAxis.baseline number automatic vAxis property that specifies the baseline for the vertical axis. If the baseline is larger than the highest grid line or smaller than the lowest grid line, it will be rounded to the closest gridline.
vAxis.baselineColor number 'black' Specifies the color of the baseline for the vertical axis. Can be any HTML color string, for example: 'red' or '#00cc00'.
vAxis.direction 1 or -1 1 The direction in which the values along the vertical axis grow. Specify -1 to reverse the order of the values.
vAxis.format string auto A format string for numeric axis labels. This is a subset of the ICU pattern set. For instance, {format:'#,###%'} will display values "1,000%", "750%", and "50%" for values 10, 7.5, and 0.5.

The actual formatting applied to the label is derived from the locale the API has been loaded with. For more details, see loading charts with a specific locale.

vAxis.gridlines Object null

An object with members to configure the gridlines on the vertical axis. To specify properties of this object, you can use object literal notation, as shown here:

 {color: '#333', count: 4}
vAxis.gridlines.color string '#CCC' The color of the vertical gridlines inside the chart area. Specify a valid HTML color string.
vAxis.gridlines.count number 5 The number of vertical gridlines inside the chart area. Minimum value is 2. Specify -1 to automatically compute the number of gridlines.
vAxis.minorGridlines Object null An object with members to configure the minor gridlines on the vertical axis, similar to the vAxis.gridlines option.
vAxis.minorGridlines.color string A blend of the gridline and background colors The color of the vertical minor gridlines inside the chart area. Specify a valid HTML color string.
vAxis.minorGridlines.count number 0 The number of vertical minor gridlines between two regular gridlines.
vAxis.logScale boolean false If true, makes the vertical axis a logarithmic scale Note: All values must be positive.
vAxis.textPosition string 'out'

Position of the vertical axis text, relative to the chart area. Supported values: 'out', 'in', 'none'.

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

An object that specifies the vertical axis 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.

vAxis.ticks Array of elements auto

Replaces the automatically generated Y-axis ticks with the specified array. Each element of the array should be either a valid tick value (such as a number, date, datetime, or timeofday), or an object. If it's an object, it should have a v property for the tick value, and an optional f property containing the literal string to be displayed as the label.

Examples:

  • vAxis: { ticks: [5,10,15,20] }
  • vAxis: { ticks: [{v:32, f:"thirty two"}, {v:64, f:"sixty four"}] }
  • vAxis: { ticks: [new Date(2014,3,15), new Date(2013,5,15)] }
  • vAxis: { ticks: [16, {v:32, f:"thirty two"}, {v:64, f:"sixty four"}, 128] }

vAxis.title string no title vAxis property that specifies a title for the vertical axis.
vAxis.titleTextStyle Object {color: 'black', fontName: <global-font-name>, fontSize: <global-font-size>}

An object that specifies the vertical axis 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.

vAxis.maxValue number automatic Moves the max value of the vertical axis to the specified value; this will be upward in most charts. Ignored if this is set to a value smaller than the maximum y-value of the data. vAxis.viewWindow.max overrides this property.
vAxis.minValue number automatic Moves the min value of the vertical axis to the specified value; this will be downward in most charts. Ignored if this is set to a value greater than the minimum y-value of the data. vAxis.viewWindow.min overrides this property.
vAxis.viewWindowMode string Equivalent to 'pretty', but vaxis.viewWindow.min and vaxis.viewWindow.max take precedence if used.

Specifies how to scale the vertical axis to render the values within the chart area. The following string values are supported:

  • 'pretty' - Scale the vertical values so that the maximum and minimum data values are rendered a bit inside the top and bottom of the chart area. This will cause vaxis.viewWindow.min and vaxis.viewWindow.max to be ignored.
  • 'maximized' - Scale the vertical values so that the maximum and minimum data values touch the top and bottom of the chart area. This will cause vaxis.viewWindow.min and vaxis.viewWindow.max to be ignored.
  • 'explicit' - A deprecated option for specifying the top and bottom scale values of the chart area. (Deprecated because it's redundant with vaxis.viewWindow.min and vaxis.viewWindow.max. Data values outside these values will be cropped. You must specify a vAxis.viewWindow object describing the maximum and minimum values to show.
vAxis.viewWindow Object null Specifies the cropping range of the vertical axis.
vAxis.viewWindow.max number auto The maximum vertical data value to render.
Ignored when vAxis.viewWindowMode is 'pretty' or 'maximized'.
vAxis.viewWindow.min number auto The minimum horizontal data value to render.
Ignored when vAxis.viewWindowMode is 'pretty' or 'maximized'.
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 bubbles. A bubble 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 bubbles. A bubble 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 bubble 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 bubble 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

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