# Visualization: Area Chart

## Overview


An area chart that is rendered within the browser using
[SVG](http://www.w3.org/Graphics/SVG/) or
[VML](http://en.wikipedia.org/wiki/Vector_Markup_Language).
Displays tips when hovering over points.

## A Simple Example

\<script type="text/javascript" src="https://www.gstatic.com/charts/loader.js"\>\</script\> \<div id="chart_div" style="width: 100%; height: 500px;"\>\</div\> 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); }

```html
<html>
  <head>
    <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>
  </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

```javascript
        var options_stacked = {
          isStacked: true,
          height: 300,
          legend: {position: 'top', maxLines: 3},
          vAxis: {minValue: 0}
        };
    
```
100% Stacked

```javascript
        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, and Segways are not available in 2014. Note that we use null values
where data is lacking, so the chart would look like this:

If those discontinuities don't appeal, you can substitute zeros for
the nulls, and/or set the interpolateNulls option to 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](https://developers.google.com/chart/interactive/docs/customizing_axes#Discrete_vs_Continuous)) - X-axis values ([continuous](https://developers.google.com/chart/interactive/docs/customizing_axes#Discrete_vs_Continuous)) | Line 1 values | ... | Line *N* values |
| Data Type: | - string ([discrete](https://developers.google.com/chart/interactive/docs/customizing_axes#Discrete_vs_Continuous)) - number, date, datetime, or timeofday ([continuous](https://developers.google.com/chart/interactive/docs/customizing_axes#Discrete_vs_Continuous)) | number | ... | number |
| Role: | domain | data | ... | data |
| Optional [column roles](https://developers.google.com/chart/interactive/docs/roles): | - [annotation](https://developers.google.com/chart/interactive/docs/roles#annotationrole) - [annotationText](https://developers.google.com/chart/interactive/docs/roles#annotationtextrole) | - [annotation](https://developers.google.com/chart/interactive/docs/roles#annotationrole) - [annotationText](https://developers.google.com/chart/interactive/docs/roles#annotationtextrole) - [certainty](https://developers.google.com/chart/interactive/docs/roles#certaintyrole) - [emphasis](https://developers.google.com/chart/interactive/docs/roles#emphasisrole) - [interval](https://developers.google.com/chart/interactive/docs/roles#intervalrole) - [scope](https://developers.google.com/chart/interactive/docs/roles#scoperole) - [style](https://developers.google.com/chart/interactive/docs/roles#stylerole) - [tooltip](https://developers.google.com/chart/interactive/docs/roles#tooltiprole) | ... | - [annotation](https://developers.google.com/chart/interactive/docs/roles#annotationrole) - [annotationText](https://developers.google.com/chart/interactive/docs/roles#annotationtextrole) - [certainty](https://developers.google.com/chart/interactive/docs/roles#certaintyrole) - [emphasis](https://developers.google.com/chart/interactive/docs/roles#emphasisrole) - [interval](https://developers.google.com/chart/interactive/docs/roles#intervalrole) - [scope](https://developers.google.com/chart/interactive/docs/roles#scoperole) - [style](https://developers.google.com/chart/interactive/docs/roles#stylerole) - [tooltip](https://developers.google.com/chart/interactive/docs/roles#tooltiprole) |
|---|---|---|---|---|

## 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](https://developers.google.com/chart/interactive/docs/animation). **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](https://developers.google.com/chart/interactive/docs/roles), 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](https://developers.google.com/chart/interactive/docs/gallery/annotationchart). **Type:** object **Default:** null |
| annotations.datum | For charts that support [annotations](https://developers.google.com/chart/interactive/docs/roles), 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](https://developers.google.com/chart/interactive/docs/roles), 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](https://developers.google.com/chart/interactive/docs/roles), 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](https://developers.google.com/chart/interactive/docs/roles), 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](https://developers.google.com/chart/interactive/docs/roles), 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](https://developers.google.com/chart/interactive/docs/roles), 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](https://developers.google.com/chart/interactive/docs/gallery/annotationchart). **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](https://developers.google.com/chart/interactive/docs/crosshairs) 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](https://developers.google.com/chart/interactive/docs/gallery/trendlines#Example4).) **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`](https://developers.google.com/chart/interactive/docs/customizing_axes#Terminology) 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`](https://developers.google.com/chart/interactive/docs/customizing_axes#Terminology) 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](http://icu-project.org/apiref/icu4c/classDecimalFormat.html#_details). 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](http://icu-project.org/apiref/icu4c/classSimpleDateFormat.html#_details). 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](https://developers.google.com/chart/interactive/docs/library_loading_enhancements#loadwithlocale). In computing tick values and gridlines, several alternative combinations of all the relevant gridline options will be considered and alternatives will be rejected if the formatted tick labels would be duplicated or overlap. So you can specify `format:"#"` if you want to only show integer tick values, but be aware that if no alternative satisfies this condition, no gridlines or ticks will be shown. This option is only supported for a [`continuous`](https://developers.google.com/chart/interactive/docs/customizing_axes#Terminology) axis. **Type:** string **Default:** auto |
| hAxis.gridlines | An object with properties to configure the gridlines on the horizontal axis. Note that horizontal axis gridlines are drawn vertically. To specify properties of this object, you can use object literal notation, as shown here: ``` {color: '#333', minSpacing: 20} ``` This option is only supported for a [`continuous`](https://developers.google.com/chart/interactive/docs/customizing_axes#Terminology) 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 approximate number of horizontal gridlines inside the chart area. If you specify a positive number for `gridlines.count`, it will be used to compute the `minSpacing` between gridlines. You can specify a value of `1` to only draw one gridline, or `0` to draw no gridlines. Specify -1, which is the default, to automatically compute the number of gridlines based on other options. **Type:** number **Default:** -1 |
| hAxis.gridlines.interval | An array of sizes (as data values, not pixels) between adjacent gridlines. This option is only for numeric axes at this time, but it is analogous to the `gridlines.units.<unit>.interval` options which are used only for dates and times. For linear scales, the default is `[1, 2, 2.5, 5]` which means the gridline values can fall on every unit (1), on even units (2), or on multiples of 2.5 or 5. Any power of 10 times these values is also considered (e.g. \[10, 20, 25, 50\] and \[.1, .2, .25, .5\]). For log scales, the default is `[1, 2, 5]`. **Type:** number between 1 and 10, not including 10. **Default:** computed |
| hAxis.gridlines.minSpacing | The minimum screen space, in pixels, between hAxis major gridlines. The default for major gridlines is `40` for linear scales, and `20` for log scales. If you specify the `count` and not the `minSpacing`, the minSpacing is computed from the count. And conversely, if you specify the `minSpacing` and not the `count`, the count is computed from the minSpacing. If you specify both, the `minSpacing` overrides. **Type:** number **Default:** computed |
| hAxis.gridlines.multiple | All gridline and tick values must be a multiple of this option's value. Note that, unlike for intervals, powers of 10 times the multiple are not considered. So you can force ticks to be integers by specifying `gridlines.multiple = 1`, or force ticks to be multiples of 1000 by specifying `gridlines.multiple = 1000`. **Type:** number **Default:** 1 |
| 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](https://developers.google.com/chart/interactive/docs/datesandtimes#axesgridlinesticks). **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`](https://developers.google.com/chart/interactive/docs/customizing_axes#Terminology) 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 `minorGridlines.count` option is mostly deprecated, except for disabling minor gridlines by setting the count to 0. The number of minor gridlines now depends entirely on the interval between major gridlines (see `hAxis.gridlines.interval`) and the minimum required space (see `hAxis.minorGridlines.minSpacing`). **Type:** number **Default:**1 |
| hAxis.minorGridlines.interval | The minorGridlines.interval option is like the major gridlines interval option, but the interval that is chosen will always be an even divisor of the major gridline interval. The default interval for linear scales is `[1, 1.5, 2, 2.5, 5]`, and for log scales is `[1, 2, 5]`. **Type:** number **Default:**1 |
| hAxis.minorGridlines.minSpacing | The minimum required space, in pixels, between adjacent minor gridlines, and between minor and major gridlines. The default value is 1/2 the minSpacing of major gridlines for linear scales, and 1/5 the minSpacing for log scales. **Type:** number **Default:**computed |
| hAxis.minorGridlines.multiple | Same as for major `gridlines.multiple`. **Type:** number **Default:** 1 |
| 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](https://developers.google.com/chart/interactive/docs/datesandtimes#axesgridlinesticks). **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`](https://developers.google.com/chart/interactive/docs/customizing_axes#Terminology) 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`](https://developers.google.com/chart/interactive/docs/customizing_axes#Terminology) 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. The viewWindow will be automatically expanded to include the min and max ticks unless you specify a `viewWindow.min` or `viewWindow.max` to override. 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`](https://developers.google.com/chart/interactive/docs/customizing_axes#Terminology) 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.allowContainerBoundaryTextCutoff | 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`](https://developers.google.com/chart/interactive/docs/customizing_axes#Terminology) 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). The default is `false` for dates and times. **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. If the angle is positive, the rotation is counter-clockwise, and if negative, it is clockwise. **Type:** number, -90---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. For dates and times, the default is 1. **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. **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 labels or dropping some of them). **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. **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`](https://developers.google.com/chart/interactive/docs/customizing_axes#Terminology) 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`](https://developers.google.com/chart/interactive/docs/customizing_axes#Terminology) 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. The viewWindow is expanded to the nearest major gridline for numbers, or the nearest minor gridline for dates and times. - '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`](https://developers.google.com/chart/interactive/docs/customizing_axes#Terminology) 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`](https://developers.google.com/chart/interactive/docs/customizing_axes#Terminology) axis: The maximum horizontal data value to render. - For a [`discrete`](https://developers.google.com/chart/interactive/docs/customizing_axes#Terminology) 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`](https://developers.google.com/chart/interactive/docs/customizing_axes#Terminology) axis: The minimum horizontal data value to render. - For a [`discrete`](https://developers.google.com/chart/interactive/docs/customizing_axes#Terminology) 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](https://developers.google.com/chart/interactive/docs/gallery/areachart) 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](https://developers.google.com/chart/interactive/docs/gallery/columnchart), [Area](https://developers.google.com/chart/interactive/docs/gallery/areachart), and [SteppedArea](https://developers.google.com/chart/interactive/docs/gallery/steppedareachart) 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](https://developers.google.com/chart/interactive/docs/gallery/barchart) 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.pageIndex | Initial selected zero-based page index of the legend. **Type:** number **Default:** 0 |
| 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](https://developers.google.com/chart/interactive/docs/lines#dashed) 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](https://developers.google.com/chart/interactive/docs/points) 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](https://developers.google.com/chart/interactive/docs/gallery/trendlines), 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](https://developers.google.com/chart/interactive/docs/gallery/trendlines), 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](https://developers.google.com/chart/interactive/docs/roles#stylerole) 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`](https://developers.google.com/chart/interactive/docs/customizing_axes#Terminology) [`major`](https://developers.google.com/chart/interactive/docs/customizing_axes#Terminology) 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](https://developers.google.com/chart/interactive/docs/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](https://developers.google.com/chart/interactive/docs/customizing_tooltip_content) for more details. **Note:** customization of the HTML tooltip content via the [tooltip column data role](https://developers.google.com/chart/interactive/docs/roles#tooltiprole) is **not** supported by the [Bubble Chart](https://developers.google.com/chart/interactive/docs/gallery/bubblechart) 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. By default, low values are on the bottom of the chart. 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](http://icu-project.org/apiref/icu4c/classDecimalFormat.html#_details). 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](https://developers.google.com/chart/interactive/docs/library_loading_enhancements#loadwithlocale). In computing tick values and gridlines, several alternative combinations of all the relevant gridline options will be considered and alternatives will be rejected if the formatted tick labels would be duplicated or overlap. So you can specify `format:"#"` if you want to only show integer tick values, but be aware that if no alternative satisfies this condition, no gridlines or ticks will be shown. **Type:** string **Default:** auto |
| vAxis.gridlines | An object with members to configure the gridlines on the vertical axis. Note that vertical axis gridlines are drawn horizontally. To specify properties of this object, you can use object literal notation, as shown here: ``` {color: '#333', minSpacing: 20} ``` **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 approximate number of horizontal gridlines inside the chart area. If you specify a positive number for `gridlines.count`, it will be used to compute the `minSpacing` between gridlines. You can specify a value of `1` to only draw one gridline, or `0` to draw no gridlines. Specify -1, which is the default, to automatically compute the number of gridlines based on other options. **Type:** number **Default:** -1 |
| vAxis.gridlines.interval | An array of sizes (as data values, not pixels) between adjacent gridlines. This option is only for numeric axes at this time, but it is analogous to the `gridlines.units.<unit>.interval` options which are used only for dates and times. For linear scales, the default is `[1, 2, 2.5, 5]` which means the gridline values can fall on every unit (1), on even units (2), or on multiples of 2.5 or 5. Any power of 10 times these values is also considered (e.g. \[10, 20, 25, 50\] and \[.1, .2, .25, .5\]). For log scales, the default is `[1, 2, 5]`. **Type:** number between 1 and 10, not including 10. **Default:** computed |
| vAxis.gridlines.minSpacing | The minimum screen space, in pixels, between hAxis major gridlines. The default for major gridlines is `40` for linear scales, and `20` for log scales. If you specify the `count` and not the `minSpacing`, the minSpacing is computed from the count. And conversely, if you specify the `minSpacing` and not the `count`, the count is computed from the minSpacing. If you specify both, the `minSpacing` overrides. **Type:** number **Default:** computed |
| vAxis.gridlines.multiple | All gridline and tick values must be a multiple of this option's value. Note that, unlike for intervals, powers of 10 times the multiple are not considered. So you can force ticks to be integers by specifying `gridlines.multiple = 1`, or force ticks to be multiples of 1000 by specifying `gridlines.multiple = 1000`. **Type:** number **Default:** 1 |
| 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](https://developers.google.com/chart/interactive/docs/datesandtimes#axesgridlinesticks). **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.interval | The minorGridlines.interval option is like the major gridlines interval option, but the interval that is chosen will always be an even divisor of the major gridline interval. The default interval for linear scales is `[1, 1.5, 2, 2.5, 5]`, and for log scales is `[1, 2, 5]`. **Type:** number **Default:**1 |
| vAxis.minorGridlines.minSpacing | The minimum required space, in pixels, between adjacent minor gridlines, and between minor and major gridlines. The default value is 1/2 the minSpacing of major gridlines for linear scales, and 1/5 the minSpacing for log scales. **Type:** number **Default:**computed |
| vAxis.minorGridlines.multiple | Same as for major `gridlines.multiple`. **Type:** number **Default:** 1 |
| vAxis.minorGridlines.count | The minorGridlines.count option is mostly deprecated, except for disabling minor gridlines by setting the count to 0. The number of minor gridlines depends on the interval between major gridlines (see vAxis.gridlines.interval) and the minimum required space (see vAxis.minorGridlines.minSpacing). **Type:** number **Default:** 1 |
| 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](https://developers.google.com/chart/interactive/docs/datesandtimes#axesgridlinesticks). **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`](https://developers.google.com/chart/interactive/docs/customizing_axes#Terminology) 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. The viewWindow will be automatically expanded to include the min and max ticks unless you specify a `viewWindow.min` or `viewWindow.max` to override. 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 bottom and top of the chart area. The viewWindow is expanded to the nearest major gridline for numbers, or the nearest minor gridline for dates and times. - '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 vertical 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`](https://developers.google.com/chart/interactive/docs/gallery/areachart#Events)event is fired. [`Extended description`](https://developers.google.com/chart/interactive/docs/reference#visdraw). **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](https://developers.google.com/chart/interactive/docs/events)), 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(xPosition, optional_axis_index)` | Returns the horizontal data value at `xPosition`, which is a pixel 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](https://developers.google.com/chart/interactive/docs/printing). **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`](https://developers.google.com/chart/interactive/docs/reference#visgetselection). **Return Type:** Array of selection elements |
| `getVAxisValue(yPosition, optional_axis_index)` | Returns the vertical data value at `yPosition`, which is a pixel offset down 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(dataValue, optional_axis_index)` | Returns the pixel x-coordinate of `dataValue` relative to the left edge of the chart's container. Example: `chart.getChartLayoutInterface().getXLocation(400)`. Call this *after* the chart is drawn. **Return Type:** number |
| `getYLocation(dataValue, optional_axis_index)` | Returns the pixel y-coordinate of `dataValue` relative to the top edge of 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](https://developers.google.com/chart/interactive/docs/reference#vissetaction). **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`](https://developers.google.com/chart/interactive/docs/reference#vissetselection). **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](https://developers.google.com/chart/interactive/docs/basic_interactivity),
[Handling Events](https://developers.google.com/chart/interactive/docs/events), and
[Firing Events](https://developers.google.com/chart/interactive/docs/dev/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 |
| `legendpagination` | Fired when the user clicks legend pagination arrows. Passes back the current legend zero-based page index and the total number of pages. **Properties:** currentPageIndex, totalPages |
| `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()`](https://developers.google.com/chart/interactive/docs/gallery/areachart#Methods). **Properties:** none |

## Data Policy


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