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Visualization: Area Chart

Overview

An area chart that is rendered within the browser using SVG or VML. Displays tips when hovering over points.

A Simple 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([
          ['Year', 'Sales', 'Expenses'],
          ['2013',  1000,      400],
          ['2014',  1170,      460],
          ['2015',  660,       1120],
          ['2016',  1030,      540]
        ]);

        var options = {
          title: 'Company Performance',
          hAxis: {title: 'Year',  titleTextStyle: {color: '#333'}},
          vAxis: {minValue: 0}
        };

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

Stacking Areas

By default, the area chart draws the series on top of one another. You can stack them atop one another instead, so that the data values at each x-value are summed. In an area chart, the value for each series will always be stacked relative to the preceding series value. Stacking a mix of negative and positive values will cause the areas to overlap. It is important to note that the interpolateNulls option does not work with stacked area charts.

On the left, isStacked is set to false (the default), and on the right it's set to true:

Note that the order of the legend entries is different. In the second, stacked chart, the order is reversed, placing series 0 at the bottom, to better correspond with the stacking of the series elements, making the legend correspond to the data.

Stacked area charts also support 100% stacking, where the stacks of elements at each domain-value are rescaled such that they add up to 100%. The options for this are isStacked: 'percent', which formats each value as a percentage of 100%, and isStacked: 'relative', which formats each value as a fraction of 1. There is also an isStacked: 'absolute' option, which is functionally equivalent to isStacked: true.

Note in the 100% stacked chart on the right, the tick values are based on the relative 0-1 scale as fractions of 1.

Stacked
        var options_stacked = {
          isStacked: true,
          height: 300,
          legend: {position: 'top', maxLines: 3},
          vAxis: {minValue: 0}
        };
    
100% Stacked
        var options_fullStacked = {
          isStacked: 'relative',
          height: 300,
          legend: {position: 'top', maxLines: 3},
          vAxis: {
            minValue: 0,
            ticks: [0, .3, .6, .9, 1]
          }
        };
    

Suppose one of your series has no data for some of your x-values. For instance, in the charts above, let's assume that drones aren't available until 2015. With null values where data is lacking, that would look like this:

If those discontinuities don't appeal, you can substitute zeros for the nulls:

Loading

The google.load package name is "corechart".

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

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

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

Data Format

Rows: Each row in the table represents a set of data points with the same x-axis location.

Columns:

  Column 0 Column 1 ... Column N
Purpose: Line 1 values ... Line N values
Data Type: number ... number
Role: domain data ... data
Optional column roles: ...

 

Configuration Options

Name
aggregationTarget
How multiple data selections are rolled up into tooltips:
  • 'category': Group selected data by x-value.
  • 'series': Group selected data by series.
  • 'auto': Group selected data by x-value if all selections have the same x-value, and by series otherwise.
  • 'none': Show only one tooltip per selection.
aggregationTarget will often be used in tandem with selectionMode and tooltip.trigger, e.g.:
var options = {
  // Allow multiple
  // simultaneous selections.
  selectionMode: 'multiple',
  // Trigger tooltips
  // on selections.
  tooltip: {trigger: 'selection'},
  // Group selections
  // by x-value.
  aggregationTarget: 'category',
};
    
Type: string
Default: 'auto'
animation.duration

The duration of the animation, in milliseconds. For details, see the animation documentation.

Type: number
Default: 0
animation.easing

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.
Type: string
Default: 'linear'
animation.startup

Determines if the chart will animate on the initial draw. If true, the chart will start at the baseline and animate to its final state.

Type: boolean
Default false
annotations.boxStyle

For charts that support annotations, the annotations.boxStyle object controls the appearance of the boxes surrounding annotations:

var options = {
  annotations: {
    boxStyle: {
      // Color of the box outline.
      stroke: '#888',
      // Thickness of the box outline.
      strokeWidth: 1,
      // x-radius of the corner curvature.
      rx: 10,
      // y-radius of the corner curvature.
      ry: 10,
      // Attributes for linear gradient fill.
      gradient: {
        // Start color for gradient.
        color1: '#fbf6a7',
        // Finish color for gradient.
        color2: '#33b679',
        // Where on the boundary to start and
        // end the color1/color2 gradient,
        // relative to the upper left corner
        // of the boundary.
        x1: '0%', y1: '0%',
        x2: '100%', y2: '100%',
        // If true, the boundary for x1,
        // y1, x2, and y2 is the box. If
        // false, it's the entire chart.
        useObjectBoundingBoxUnits: true
      }
    }
  }
};
    

This option is currently supported for area, bar, column, combo, line, and scatter charts. It is not supported by the Annotation Chart.

Type: object
Default: null
annotations.highContrast
For charts that support annotations, the annotations.highContrast boolean lets you override Google Charts' choice of the annotation color. By default, annotations.highContrast is true, which causes Charts to select an annotation color with good contrast: light colors on dark backgrounds, and dark on light. If you set annotations.highContrast to false and don't specify your own annotation color, Google Charts will use the default series color for the annotation:
Type: boolean
Default: true
annotations.textStyle
For charts that support annotations, the annotations.textStyle object controls the appearance of the text of the annotation:
var options = {
  annotations: {
    textStyle: {
      fontName: 'Times-Roman',
      fontSize: 18,
      bold: true,
      italic: true,
      // The color of the text.
      color: '#871b47',
      // The color of the text outline.
      auraColor: '#d799ae',
      // The transparency of the text.
      opacity: 0.8
    }
  }
};
    

This option is currently supported for area, bar, column, combo, line, and scatter charts. It is not supported by the Annotation Chart .

Type: object
Default: null
areaOpacity

The default opacity of the colored area under an area chart series, where 0.0 is fully transparent and 1.0 is fully opaque. To specify opacity for an individual series, set the areaOpacity value in the series property.

Type: number, 0.0–1.0
Default: 0.3
axisTitlesPosition

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.
Type: string
Default: 'out'
backgroundColor

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.

Type: string or object
Default: 'white'
backgroundColor.stroke

The color of the chart border, as an HTML color string.

Type: string
Default: '#666'
backgroundColor.strokeWidth

The border width, in pixels.

Type: number
Default: 0
backgroundColor.fill

The chart fill color, as an HTML color string.

Type: string
Default: 'white'
chartArea

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%'}

Type: object
Default: null
chartArea.backgroundColor
Chart area background color. When a string is used, it can be either a hex string (e.g., '#fdc') or an English color name. When an object is used, the following properties can be provided:
  • stroke: the color, provided as a hex string or English color name.
  • strokeWidth: if provided, draws a border around the chart area of the given width (and with the color of stroke).
Type: string or object
Default: 'white'
chartArea.left

How far to draw the chart from the left border.

Type: number or string
Default: auto
chartArea.top

How far to draw the chart from the top border.

Type: number or string
Default: auto
chartArea.width

Chart area width.

Type: number or string
Default: auto
chartArea.height

Chart area height.

Type: number or string
Default: auto
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'].

Type: Array of strings
Default: default colors
crosshair

An object containing the crosshair properties for the chart.

Type: object
Default: null
crosshair.color

The crosshair color, expressed as either a color name (e.g., "blue") or an RGB value (e.g., "#adf").

Type: string
Type: default
crosshair.focused

An object containing the crosshair properties upon focus.
Example: crosshair: { focused: { color: '#3bc', opacity: 0.8 } }

Type: object
Default: default
crosshair.opacity

The crosshair opacity, with 0.0 being fully transparent and 1.0 fully opaque.

Type: number
Default: 1.0
crosshair.orientation

The crosshair orientation, which can be 'vertical' for vertical hairs only, 'horizontal' for horizontal hairs only, or 'both' for traditional crosshairs.

Type: string
Default: 'both'
crosshair.selected

An object containing the crosshair properties upon selection.
Example: crosshair: { selected: { color: '#3bc', opacity: 0.8 } }

Type: object
Default: default
crosshair.trigger

When to display crosshairs: on 'focus', 'selection', or 'both'.

Type: string
Default: 'both'
dataOpacity

The transparency of data points, with 1.0 being completely opaque and 0.0 fully transparent. In scatter, histogram, bar, and column charts, this refers to the visible data: dots in the scatter chart and rectangles in the others. In charts where selecting data creates a dot, such as the line and area charts, this refers to the circles that appear upon hover or selection. The combo chart exhibits both behaviors, and this option has no effect on other charts. (To change the opacity of a trendline, see trendline opacity .)

Type: number
Default: 1.0
enableInteractivity

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.

Type: boolean
Default: true
explorer

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.

Note: The explorer only works with continuous axes (such as numbers or dates).

Type: object
Default: null
explorer.actions

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.
Type: Array of strings
Default: ['dragToPan', 'rightClickToReset']
explorer.axis

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.

Type: string
Default: both horizontal and vertical panning
explorer.keepInBounds

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 }.

Type: boolean
Default: false
explorer.maxZoomIn

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.

Type: number
Default: 0.25
explorer.maxZoomOut

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.

Type: number
Default: 4
explorer.zoomDelta

When users zoom in or out, explorer.zoomDelta determines how much they zoom by. The smaller the number, the smoother and slower the zoom.

Type: number
Default: 1.5
focusTarget

The type of the entity that receives focus on mouse hover. Also affects which entity is selected by mouse click, and which data table element is associated with events. Can be one of the following:

  • 'datum' - Focus on a single data point. Correlates to a cell in the data table.
  • 'category' - Focus on a grouping of all data points along the major axis. Correlates to a row in the data table.

In focusTarget 'category' the tooltip displays all the category values. This may be useful for comparing values of different series.

Type: string
Default: 'datum'
fontSize

The default font size, in pixels, of all text in the chart. You can override this using properties for specific chart elements.

Type: number
Default: automatic
fontName

The default font face for all text in the chart. You can override this using properties for specific chart elements.

Type: string
Default: 'Arial'
forceIFrame

Draws the chart inside an inline frame. (Note that on IE8, this option is ignored; all IE8 charts are drawn in i-frames.)

Type: boolean
Default: false
hAxis

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'
  }
}
    
Type: object
Default: null
hAxis.baseline

The baseline for the horizontal axis.

This option is only supported for a continuous axis.

Type: number
Default: automatic
hAxis.baselineColor

The color of the baseline for the horizontal axis. Can be any HTML color string, for example: 'red' or '#00cc00'.

This option is only supported for a continuous axis.

Type: number
Default: 'black'
hAxis.direction

The direction in which the values along the horizontal axis grow. Specify -1 to reverse the order of the values.

Type: 1 or -1
Default: 1
hAxis.format

A format string for numeric or date axis labels.

For number axis labels, this is a subset of the decimal formatting ICU pattern set . For instance, {format:'#,###%'} will display values "1,000%", "750%", and "50%" for values 10, 7.5, and 0.5. You can also supply any of the following:

  • {format: 'none'}: displays numbers with no formatting (e.g., 8000000)
  • {format: 'decimal'}: displays numbers with thousands separators (e.g., 8,000,000)
  • {format: 'scientific'}: displays numbers in scientific notation (e.g., 8e6)
  • {format: 'currency'}: displays numbers in the local currency (e.g., $8,000,000.00)
  • {format: 'percent'}: displays numbers as percentages (e.g., 800,000,000%)
  • {format: 'short'}: displays abbreviated numbers (e.g., 8M)
  • {format: 'long'}: displays numbers as full words (e.g., 8 million)

For date axis labels, this is a subset of the date formatting ICU pattern set . For instance, {format:'MMM d, y'} will display the value "Jul 1, 2011" for the date of July first in 2011.

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 .

This option is only supported for a continuous axis.

Type: string
Default: auto
hAxis.gridlines

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}

This option is only supported for a continuous axis.

Type: object
Default: null
hAxis.gridlines.color

The color of the horizontal gridlines inside the chart area. Specify a valid HTML color string.

Type: string
Default: '#CCC'
hAxis.gridlines.count

The number of horizontal gridlines inside the chart area. Minimum value is 2. Specify -1 to automatically compute the number of gridlines.

Type: number
Default: 5
hAxis.gridlines.units

Overrides the default format for various aspects of date/datetime/timeofday data types when used with chart computed gridlines. Allows formatting for years, months, days, hours, minutes, seconds, and milliseconds.

General format is:

gridlines: {
  units: {
    years: {format: [/*format strings here*/]},
    months: {format: [/*format strings here*/]},
    days: {format: [/*format strings here*/]}
    hours: {format: [/*format strings here*/]}
    minutes: {format: [/*format strings here*/]}
    seconds: {format: [/*format strings here*/]},
    milliseconds: {format: [/*format strings here*/]},
  }
}
    

Additional information can be found in Dates and Times.

Type: object
Default: null
hAxis.minorGridlines

An object with members to configure the minor gridlines on the horizontal axis, similar to the hAxis.gridlines option.

This option is only supported for a continuous axis.

Type: object
Default: null
hAxis.minorGridlines.color

The color of the horizontal minor gridlines inside the chart area. Specify a valid HTML color string.

Type: string
Default: A blend of the gridline and background colors
hAxis.minorGridlines.count

The number of horizontal minor gridlines between two regular gridlines.

Type: number
Default: 0
hAxis.minorGridlines.units

Overrides the default format for various aspects of date/datetime/timeofday data types when used with chart computed minorGridlines. Allows formatting for years, months, days, hours, minutes, seconds, and milliseconds.

General format is:

gridlines: {
  units: {
    years: {format: [/*format strings here*/]},
    months: {format: [/*format strings here*/]},
    days: {format: [/*format strings here*/]}
    hours: {format: [/*format strings here*/]}
    minutes: {format: [/*format strings here*/]}
    seconds: {format: [/*format strings here*/]},
    milliseconds: {format: [/*format strings here*/]},
  }
}
    

Additional information can be found in Dates and Times.

Type: object
Default: null
hAxis.logScale

hAxis property that makes the horizontal axis a logarithmic scale (requires all values to be positive). Set to true for yes.

This option is only supported for a continuous axis.

Type: boolean
Default: false
hAxis.textPosition

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

Type: string
Default: 'out'
hAxis.textStyle

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.

Type: object
Default: {color: 'black', fontName: <global-font-name>, fontSize: <global-font-size>}
hAxis.ticks

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] }

This option is only supported for a continuous axis.

Type: Array of elements
Default: auto
hAxis.title

hAxis property that specifies the title of the horizontal axis.

Type: string
Default: null
hAxis.titleTextStyle

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.

Type: object
Default: {color: 'black', fontName: <global-font-name>, fontSize: <global-font-size>}
hAxis.allowContainerBoundaryTextCufoff

If false, will hide outermost labels rather than allow them to be cropped by the chart container. If true, will allow label cropping.

This option is only supported for a discrete axis.

Type: boolean
Default: false
hAxis.slantedText

If true, draw the horizontal axis text at an angle, to help fit more text along the axis; if false, draw horizontal axis text upright. Default behavior is to slant text if it cannot all fit when drawn upright. Notice that this option is available only when the hAxis.textPosition is set to 'out' (which is the default).

This option is only supported for a discrete axis.

Type: boolean
Default: automatic
hAxis.slantedTextAngle

The angle of the horizontal axis text, if it's drawn slanted. Ignored if hAxis.slantedText is false, or is in auto mode, and the chart decided to draw the text horizontally.

This option is only supported for a discrete axis.

Type: number, 1—90
Default: 30
hAxis.maxAlternation

Maximum number of levels of horizontal axis text. If axis text labels become too crowded, the server might shift neighboring labels up or down in order to fit labels closer together. This value specifies the most number of levels to use; the server can use fewer levels, if labels can fit without overlapping.

This option is only supported for a discrete axis.

Type: number
Default: 2
hAxis.maxTextLines

Maximum number of lines allowed for the text labels. Labels can span multiple lines if they are too long, and the nuber of lines is, by default, limited by the height of the available space.

This option is only supported for a discrete axis.

Type: number
Default: auto
hAxis.minTextSpacing

Minimum horizontal spacing, in pixels, allowed between two adjacent text labels. If the labels are spaced too densely, or they are too long, the spacing can drop below this threshold, and in this case one of the label-unclutter measures will be applied (e.g, truncating the lables or dropping some of them).

This option is only supported for a discrete axis.

Type: number
Default: The value of hAxis.textStyle.fontSize
hAxis.showTextEvery

How many horizontal axis labels to show, where 1 means show every label, 2 means show every other label, and so on. Default is to try to show as many labels as possible without overlapping.

This option is only supported for a discrete axis.

Type: number
Default: automatic
hAxis.maxValue

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.

This option is only supported for a continuous axis.

Type: number
Default: automatic
hAxis.minValue

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.

This option is only supported for a continuous axis.

Type: number
Default: automatic
hAxis.viewWindowMode

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.

This option is only supported for a continuous axis.

Type: string
Defaut: Equivalent to 'pretty', but haxis.viewWindow.min and haxis.viewWindow.max take precedence if used.
hAxis.viewWindow

Specifies the cropping range of the horizontal axis.

Type: object
Default: null
hAxis.viewWindow.max
  • For a continuous axis:

    The maximum horizontal data value to render.

  • For a discrete axis:

    The zero-based row index where the cropping window ends. Data points at this index and higher will be cropped out. In conjunction with vAxis.viewWindowMode.min, it defines a half-opened range [min, max) that denotes the element indices to display. In other words, every index such that min <= index < max will be displayed.

Ignored when hAxis.viewWindowMode is 'pretty' or 'maximized'.

Type: number
Default: auto
hAxis.viewWindow.min
  • For a continuous axis:

    The minimum horizontal data value to render.

  • For a discrete axis:

    The zero-based row index where the cropping window begins. Data points at indices lower than this will be cropped out. In conjunction with vAxis.viewWindowMode.max, it defines a half-opened range [min, max) that denotes the element indices to display. In other words, every index such that min <= index < max will be displayed.

Ignored when hAxis.viewWindowMode is 'pretty' or 'maximized'.

Type: number
Default: auto
height

Height of the chart, in pixels.

Type: number
Default: height of the containing element
interpolateNulls

Whether to guess the value of missing points. If true, it will guess the value of any missing data based on neighboring points. If false, it will leave a break in the line at the unknown point.

This is not supported by Area charts with the isStacked: true/'percent'/'relative'/'absolute' option.

Type: boolean
Default: false
isStacked

If set to true, stacks the elements for all series at each domain value. Note: In Column, Area, and SteppedArea charts, Google Charts reverses the order of legend items to better correspond with the stacking of the series elements (E.g. series 0 will be the bottom-most legend item). This does not apply to Bar Charts.

The isStacked option also supports 100% stacking, where the stacks of elements at each domain value are rescaled to add up to 100%.

The options for isStacked are:

  • false — elements will not stack. This is the default option.
  • true — stacks elements for all series at each domain value.
  • 'percent' — stacks elements for all series at each domain value and rescales them such that they add up to 100%, with each element's value calculated as a percentage of 100%.
  • 'relative' — stacks elements for all series at each domain value and rescales them such that they add up to 1, with each element's value calculated as a fraction of 1.
  • 'absolute' — functions the same as isStacked: true.

For 100% stacking, the calculated value for each element will appear in the tooltip after its actual value.

The target axis will default to tick values based on the relative 0-1 scale as fractions of 1 for 'relative', and 0-100% for 'percent' (Note: when using the 'percent' option, the axis/tick values are displayed as percentages, however the actual values are the relative 0-1 scale values. This is because the percentage axis ticks are the result of applying a format of "#.##%" to the relative 0-1 scale values. When using isStacked: 'percent', be sure to specify any ticks/gridlines using the relative 0-1 scale values). You can customize the gridlines/tick values and formatting using the appropriate hAxis/vAxis options.

100% stacking only supports data values of type number, and must have a baseline of zero.

Type: boolean/string
Default: false
legend

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}}
Type: object
Default: null
legend.alignment

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'.

Type: string
Default: automatic
legend.maxLines

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'.

Type: number
Default: 1
legend.position

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.
Type: string
Default: 'right'
legend.textStyle

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.

Type: object
Default: {color: 'black', fontName: <global-font-name>, fontSize: <global-font-size>}
lineDashStyle

The on-and-off pattern for dashed lines. For instance, [4, 4] will repeat 4-length dashes followed by 4-length gaps, and [5, 1, 3] will repeat a 5-length dash, a 1-length gap, a 3-length dash, a 5-length gap, a 1-length dash, and a 3-length gap. See Dashed Lines for more information.

Type: Array of numbers
Default: null
lineWidth

Data line width in pixels. Use zero to hide all lines and show only the points. You can override values for individual series using the series property.

Type: number
Default: 2
orientation

The orientation of the chart. When set to 'vertical', rotates the axes of the chart so that (for instance) a column chart becomes a bar chart, and an area chart grows rightward instead of up:

Type: string
Default: 'horizontal'
pointShape

The shape of individual data elements: 'circle', 'triangle', 'square', 'diamond', 'star', or 'polygon'. See the points documentation for examples.

Type: string
Default: 'circle'
pointSize

Diameter of displayed points in pixels. Use zero to hide all points. You can override values for individual series using the series property. If you're using a trendline, the pointSize option will affect the width of the trendline unless you override it with the trendlines.n.pointsize option.

Type: number
Default: 0
pointsVisible

Determines whether points will be displayed. Set to false to hide all points. You can override values for individual series using the series property. If you're using a trendline, the pointsVisible option will affect the visibility of the points on all trendlines unless you override it with the trendlines.n.pointsVisible option.

This can also be overridden using the style role in the form of "point {visible: true}".

Type: boolean
Default: true
reverseCategories

If set to true, will draw series from right to left. The default is to draw left-to-right.

This option is only supported for a discrete major axis.

Type: boolean
Default: false
selectionMode

When selectionMode is 'multiple', users may select multiple data points.

Type: string
Default: 'single'
series

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

  • annotations - An object to be applied to annotations for this series. This can be used to control, for instance, the textStyle for the series:

    series: {
      0: {
        annotations: {
          textStyle: {fontSize: 12, color: 'red' }
        }
      }
    }
              

    See the various annotations options for a more complete list of what can be customized.

  • areaOpacity - Overrides the global areaOpacity for this series.
  • color - The color to use for this series. Specify a valid HTML color string.
  • labelInLegend - The description of the series to appear in the chart legend.
  • lineDashStyle - Overrides the global lineDashStyle value for this series.
  • lineWidth - Overrides the global lineWidth value for this series.
  • pointShape - Overrides the global pointShape value for this series.
  • pointSize - Overrides the global pointSize value for this series.
  • pointsVisible - Overrides the global pointsVisible value for this series.
  • targetAxisIndex - Which axis to assign this series to, where 0 is the default axis, and 1 is the opposite axis. Default value is 0; set to 1 to define a chart where different series are rendered against different axes. At least one series much be allocated to the default axis. You can define a different scale for different axes.
  • 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.

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

series: [
  {color: 'black', visibleInLegend: false}, {}, {},
  {color: 'red', visibleInLegend: false}
]
series: {
  0:{color: 'black', visibleInLegend: false},
  3:{color: 'red', visibleInLegend: false}
}
    
Type: Array of objects, or object with nested objects
Default: {}
theme

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'}
            
Type: string
Default: null
title

Text to display above the chart.

Type: string
Default: no title
titlePosition

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.
Type: string
Default: 'out'
titleTextStyle

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.

Type: object
Default: {color: 'black', fontName: <global-font-name>, fontSize: <global-font-size>}
tooltip

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}
Type: object
Default: null
tooltip.isHtml

If set to true, use HTML-rendered (rather than SVG-rendered) tooltips. See Customizing Tooltip Content for more details.

Note: customization of the HTML tooltip content via the tooltip column data role is not supported by the Bubble Chart visualization.

Type: boolean
Default: false
tooltip.showColorCode

If true, show colored squares next to the series information in the tooltip. The default is true when focusTarget is set to 'category', otherwise the default is false.

Type: boolean
Default: automatic
tooltip.textStyle

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.

Type: object
Default: {color: 'black', fontName: <global-font-name>, fontSize: <global-font-size>}
tooltip.trigger

The user interaction that causes the tooltip to be displayed:

  • 'focus' - The tooltip will be displayed when the user hovers over the element.
  • 'none' - The tooltip will not be displayed.
  • 'selection' - The tooltip will be displayed when the user selects the element.
Type: string
Default: 'focus'
vAxes

Specifies properties for individual vertical axes, if the chart has multiple vertical axes. Each child object is a vAxis object, and can contain all the properties supported by vAxis. These property values override any global settings for the same property.

To specify a chart with multiple vertical axes, first define a new axis using series.targetAxisIndex, then configure the axis using vAxes. The following example assigns series 2 to the right axis and specifies a custom title and text style for it:

series: {
  2: {
    targetAxisIndex:1
  },
  vAxes: {
    1: {
      title:'Losses',
      textStyle: {color: 'red'}
    }
  }
}
    

This property can be either an object or an array: the object is a collection of objects, each with a numeric label that specifies the axis that it defines--this is the format shown above; the array is an array of objects, one per axis. For example, the following array-style notation is identical to the vAxis object shown above:

vAxes: [
  {}, // Nothing specified for axis 0
  {
    title:'Losses',
    textStyle: {color: 'red'} // Axis 1
  }
]
    
Type: Array of object, or object with child objects
Default: null
vAxis

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'}}
Type: object
Default: null
vAxis.baseline

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.

Type: number
Default: automatic
vAxis.baselineColor

Specifies the color of the baseline for the vertical axis. Can be any HTML color string, for example: 'red' or '#00cc00'.

Type: number
Default: 'black'
vAxis.direction

The direction in which the values along the vertical axis grow. Specify -1 to reverse the order of the values.

Type: 1 or -1
Default: 1
vAxis.format

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. You can also supply any of the following:

  • {format: 'none'}: displays numbers with no formatting (e.g., 8000000)
  • {format: 'decimal'}: displays numbers with thousands separators (e.g., 8,000,000)
  • {format: 'scientific'}: displays numbers in scientific notation (e.g., 8e6)
  • {format: 'currency'}: displays numbers in the local currency (e.g., $8,000,000.00)
  • {format: 'percent'}: displays numbers as percentages (e.g., 800,000,000%)
  • {format: 'short'}: displays abbreviated numbers (e.g., 8M)
  • {format: 'long'}: displays numbers as full words (e.g., 8 million)

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 .

Type: string
Default: auto
vAxis.gridlines

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}
Type: object
Default: null
vAxis.gridlines.color

The color of the vertical gridlines inside the chart area. Specify a valid HTML color string.

Type: string
Default: '#CCC'
vAxis.gridlines.count

The number of vertical gridlines inside the chart area. Minimum value is 2. Specify -1 to automatically compute the number of gridlines.

Type: number
Default: 5
vAxis.gridlines.units

Overrides the default format for various aspects of date/datetime/timeofday data types when used with chart computed gridlines. Allows formatting for years, months, days, hours, minutes, seconds, and milliseconds.

General format is:

gridlines: {
  units: {
    years: {format: [/*format strings here*/]},
    months: {format: [/*format strings here*/]},
    days: {format: [/*format strings here*/]}
    hours: {format: [/*format strings here*/]}
    minutes: {format: [/*format strings here*/]}
    seconds: {format: [/*format strings here*/]},
    milliseconds: {format: [/*format strings here*/]},
  }
}
    

Additional information can be found in Dates and Times.

Type: object
Default: null
vAxis.minorGridlines

An object with members to configure the minor gridlines on the vertical axis, similar to the vAxis.gridlines option.

Type: object
Default: null
vAxis.minorGridlines.color

The color of the vertical minor gridlines inside the chart area. Specify a valid HTML color string.

Type: string
Default: A blend of the gridline and background colors
vAxis.minorGridlines.count

The number of vertical minor gridlines between two regular gridlines.

Type: number
Default: 0
vAxis.minorGridlines.units

Overrides the default format for various aspects of date/datetime/timeofday data types when used with chart computed minorGridlines. Allows formatting for years, months, days, hours, minutes, seconds, and milliseconds.

General format is:

gridlines: {
  units: {
    years: {format: [/*format strings here*/]},
    months: {format: [/*format strings here*/]},
    days: {format: [/*format strings here*/]}
    hours: {format: [/*format strings here*/]}
    minutes: {format: [/*format strings here*/]}
    seconds: {format: [/*format strings here*/]},
    milliseconds: {format: [/*format strings here*/]},
  }
}
    

Additional information can be found in Dates and Times.

Type: object
Default: null
vAxis.logScale

If true, makes the vertical axis a logarithmic scale. Note: All values must be positive.

Type: boolean
Default: false
vAxis.textPosition

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

Type: string
Default: 'out'
vAxis.textStyle

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.

Type: object
Default: {color: 'black', fontName: <global-font-name>, fontSize: <global-font-size>}
vAxis.ticks

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] }
Type: Array of elements
Default: auto
vAxis.title

vAxis property that specifies a title for the vertical axis.

Type: string
Default: no title
vAxis.titleTextStyle

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.

Type: object
Default: {color: 'black', fontName: <global-font-name>, fontSize: <global-font-size>}
vAxis.maxValue

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.

Type: number
Default: automatic
vAxis.minValue

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.

Type: number
Default: automatic
vAxis.viewWindowMode

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.
Type: string
Default: Equivalent to 'pretty', but vaxis.viewWindow.min and vaxis.viewWindow.max take precedence if used.
vAxis.viewWindow

Specifies the cropping range of the vertical axis.

Type: object
Default: null
vAxis.viewWindow.max

The maximum vertical data value to render.

Ignored when vAxis.viewWindowMode is 'pretty' or 'maximized'.

Type: number
Default: auto
vAxis.viewWindow.min

The minimum horizontal data value to render.

Ignored when vAxis.viewWindowMode is 'pretty' or 'maximized'.

Type: number
Default: auto
width

Width of the chart, in pixels.

Type: number
Default: width of the containing element

Methods

Method
draw(data, options)

Draws the chart. The chart accepts further method calls only after the readyevent is fired. Extended description.

Return Type: none
getAction(actionID)

Returns the tooltip action object with the requested actionID.

Return Type: object
getBoundingBox(id)

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.

Return Type: object
getChartAreaBoundingBox()

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.

Return Type: object
getChartLayoutInterface()

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.

Return Type: object
getHAxisValue(position, optional_axis_index)

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.

Return Type: number
getImageURI()

Returns the chart serialized as an image URI.

Call this after the chart is drawn.

See Printing PNG Charts.

Return Type: string
getSelection()

Returns an array of the selected chart entities. Selectable entities are points, annotations, legend entries and categories. A point or annotation corresponds to a cell in the data table, a legend entry to a column (row index is null), and a category to a row (column index is null). For this chart, only one entity can be selected at any given moment. Extended description .

Return Type: Array of selection elements
getVAxisValue(position, optional_axis_index)

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.

Return Type: number
getXLocation(position, optional_axis_index)

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.

Return Type: number
getYLocation(position, optional_axis_index)

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.

Return Type: number
removeAction(actionID)

Removes the tooltip action with the requested actionID from the chart.

Return Type: none
setAction(action)

Sets a tooltip action to be executed when the user clicks on the action text.

The setAction method takes an object as its action parameter. This object should specify 3 properties: id— the ID of the action being set, text —the text that should appear in the tooltip for the action, and action — the function that should be run when a user clicks on the action text.

Any and all tooltip actions should be set prior to calling the chart's draw() method. Extended description.

Return Type: none
setSelection()

Selects the specified chart entities. Cancels any previous selection. Selectable entities are points, annotations, legend entries and categories. A point or annotation corresponds to a cell in the data table, a legend entry to a column (row index is null), and a category to a row (column index is null). For this chart, only one entity can be selected at a time. Extended description .

Return Type: none
clearChart()

Clears the chart, and releases all of its allocated resources.

Return Type: none

Events

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

Name
animationfinish

Fired when transition animation is complete.

Properties: none
click

Fired when the user clicks inside the chart. Can be used to identify when the title, data elements, legend entries, axes, gridlines, or labels are clicked.

Properties: targetID
error

Fired when an error occurs when attempting to render the chart.

Properties: 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.

Properties: 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.

Properties: 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.

Properties: none
select

Fired when the user clicks a visual entity. To learn what has been selected, call getSelection().

Properties: none

Data Policy

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