可视化数据网页开发Google Charts（七）：面积图

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    <script type="text/javascript" src="https://www.gstatic.com/charts/loader.js"></script>
    <script type="text/javascript">
      google.charts.load('current', {'packages':['corechart']});
      google.charts.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: 100%; height: 500px;"></div>
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默认情况下，区域图将一个系列绘制在另一个之上。相反，您可以将它们堆叠在一起，以便对每个x值的数据值求和。在区域图中，每个系列的值总是相对于前一个系列的值进行堆叠。将负值和正值混合在一起将导致区域重叠。需要注意的是，插值图选项不能用于叠加区域图。

左边isStacked设置为false(默认值)，右边设置为true

注意，图例条目的顺序不同。在第二张堆叠图中，将顺序颠倒，将series 0放在底部，以便更好地对应series元素的堆叠，使图例与数据对应。

堆叠区域图也支持100%堆叠，其中每个域值上的元素堆叠被重新标度，使它们加起来达到100%。它的选项是isStacked: 'percent'，将每个值格式化为100%的百分比;'isStacked: 'relative''将每个值格式化为1的分数。还有一个isStacked: 'absolute'选项，它在功能上等价于isStacked:true。

Loading

The google.charts.load package name is "corechart".

google.charts.load("current", {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:	X-axis group labels (discrete) X-axis values (continuous)	Line 1 values	...	Line N values
Data Type:	string (discrete) number, date, datetime, or timeofday (continuous)	number	...	number
Role:	domain	data	...	data
Optional column roles:	annotation annotationText	annotation annotationText certainty emphasis interval scope style tooltip	...	annotation annotationText certainty emphasis interval scope style tooltip

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.datum	For charts that support annotations, the `annotations.datum` object lets you override Google Charts' choice for annotations provided for individual data elements (such as values displayed with each bar on a bar chart). You can control the color with `annotations.datum.stem.color`, the stem length with `annotations.datum.stem.length`, and the style with `annotations.datum.style`. Type: object Default: color is "black"; length is 12; style is "point".
annotations.domain	For charts that support annotations, the `annotations.domain` object lets you override Google Charts' choice for annotations provided for a domain (the major axis of the chart, such as the X axis on a typical line chart). You can control the color with `annotations.domain.stem.color`, the stem length with `annotations.domain.stem.length`, and the style with `annotations.domain.style`. Type: object Default: color is "black"; length is 5; style is "point".
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.stem	For charts that support annotations, the `annotations.stem` object lets you override Google Charts' choice for the stem style. You can control color with `annotations.stem.color` and the stem length with `annotations.stem.length`. Note that the stem length option has no effect on annotations with style `'line'`: for `'line'` datum annotations, the stem length is always the same as the text, and for `'line'` domain annotations, the stem extends across the entire chart. Type: object Default: color is "black"; length is 5 for domain annotations and 12 for datum annotations.
annotations.style	For charts that support annotations, the `annotations.style` option lets you override Google Charts' choice of the annotation type. It can be either `'line'` or `'point'`. Type: string Default: 'point'
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 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.scaleType	`hAxis` property that makes the horizontal axis a logarithmic scale. Can be one of the following: null - No logarithmic scaling is performed. 'log' - Logarithmic scaling. Negative and zero values are not plotted. This option is the same as setting `hAxis: { logscale: true }`. 'mirrorLog' - Logarithmic scaling in which negative and zero values are plotted. The plotted value of a negative number is the negative of the log of the absolute value. Values close to 0 are plotted on a linear scale. This option is only supported for a `continuous` axis. Type: string Default: null
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 number 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 Default: 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.ignoreBounds	If set to `true`, allows the drawing of tooltips to flow outside of the bounds of the chart on all sides. Note: This only applies to HTML tooltips. If this is enabled with SVG tooltips, any overflow outside of the chart bounds will be cropped. See Customizing Tooltip Content for more details. Type: boolean Default: false
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.scaleType	`vAxis` property that makes the vertical axis a logarithmic scale. Can be one of the following: null - No logarithmic scaling is performed. 'log' - Logarithmic scaling. Negative and zero values are not plotted. This option is the same as setting `vAxis: { logscale: true }`. 'mirrorLog' - Logarithmic scaling in which negative and zero values are plotted. The plotted value of a negative number is the negative of the log of the absolute value. Values close to 0 are plotted on a linear scale. This option is only supported for a `continuous` axis. Type: string Default: null
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: null
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 `ready`event 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