Overview
A histogram is a chart that groups numeric data into bins, displaying the bins as segmented columns. They're used to depict the distribution of a dataset: how often values fall into ranges.
Google Charts automatically chooses the number of bins for you. All bins are equal width and have a height proportional to the number of data points in the bin. In other respects, histograms are similar to column charts.
Example
Here's a histogram of dinosaur lengths:
The histogram tells us that the most common bin is < 10 meters, and that there's only one dinosaur over 40 meters. We can hover over the bar to discover that it's the Seismosaurus (which might be just a very big Diplodocus; paleontologists aren't sure).
The code to generate this histogram is shown below. After defining
the data (here,
with google.visualization.arrayToDataTable
), the chart is
defined with a call to google.visualization.Histogram
and
drawn with the draw
method.
<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([ ['Dinosaur', 'Length'], ['Acrocanthosaurus (top-spined lizard)', 12.2], ['Albertosaurus (Alberta lizard)', 9.1], ['Allosaurus (other lizard)', 12.2], ['Apatosaurus (deceptive lizard)', 22.9], ['Archaeopteryx (ancient wing)', 0.9], ['Argentinosaurus (Argentina lizard)', 36.6], ['Baryonyx (heavy claws)', 9.1], ['Brachiosaurus (arm lizard)', 30.5], ['Ceratosaurus (horned lizard)', 6.1], ['Coelophysis (hollow form)', 2.7], ['Compsognathus (elegant jaw)', 0.9], ['Deinonychus (terrible claw)', 2.7], ['Diplodocus (double beam)', 27.1], ['Dromicelomimus (emu mimic)', 3.4], ['Gallimimus (fowl mimic)', 5.5], ['Mamenchisaurus (Mamenchi lizard)', 21.0], ['Megalosaurus (big lizard)', 7.9], ['Microvenator (small hunter)', 1.2], ['Ornithomimus (bird mimic)', 4.6], ['Oviraptor (egg robber)', 1.5], ['Plateosaurus (flat lizard)', 7.9], ['Sauronithoides (narrow-clawed lizard)', 2.0], ['Seismosaurus (tremor lizard)', 45.7], ['Spinosaurus (spiny lizard)', 12.2], ['Supersaurus (super lizard)', 30.5], ['Tyrannosaurus (tyrant lizard)', 15.2], ['Ultrasaurus (ultra lizard)', 30.5], ['Velociraptor (swift robber)', 1.8]]); var options = { title: 'Lengths of dinosaurs, in meters', legend: { position: 'none' }, }; var chart = new google.visualization.Histogram(document.getElementById('chart_div')); chart.draw(data, options); } </script> </head> <body> <div id="chart_div" style="width: 900px; height: 500px;"></div> </body> </html>
The labels (here, the dinosaur names) can be omitted, in which case the tooltips will show only the numeric value.
Controlling Colors
Here's a histogram of national populations:
There are over two hundred countries with populations less than a hundred million, and a severe tailing off after that.
This histogram uses the colors
option to draw the data
in green:
var options = { title: 'Country Populations', legend: { position: 'none' }, colors: ['green'], };
As with all Google Charts, colors can be specified either as English names or as hex values.
Controlling Buckets
By default, Google Charts will choose the bucket size automatically, using a well-known algorithm for histograms. However, sometimes you'll want to override that, and the chart above is an example. With so many countries in the first bucket, it's hard to examine those in others.
For situations like this, the Histogram chart provides two
options: histogram.bucketSize
, which overrides the
algorithm and hardcodes the bucket size;
and histogram.lastBucketPercentile
. The second option
needs more explanation: it changes the computation of
bucket sizes to ignore the values that are higher or lower than the
remaining values by the percentage you specify. The values are still
included in the histogram, but do not affect how they're
bucketed. This is useful when you don't want outliers to land in their
own buckets; they will be grouped with the first or last buckets instead.
In the above chart, we ignored the top five and bottom five percent of values when calculating bucket size. The values are still charted; the only thing that's changed is the bucket size, but it makes for a more readable histogram.
This example also shows how we can change the scale of the vertical axis to use "mirror log" scale, which also helps when charting data that has a long tail of small values.
var options = { title: 'Country Populations', legend: { position: 'none' }, colors: ['#e7711c'], histogram: { lastBucketPercentile: 5 }, vAxis: { scaleType: 'mirrorLog' } };
As you can see, removing the top and bottom five percent from the
calculation led to a bucket size of 10,000,000 rather than the
100,000,000 it would have been otherwise. If you knew all along that a
bucket size of 10,000,000 was what you wanted, you could have
used histogram.bucketSize
to do that:
var options = { title: 'Country Populations', legend: { position: 'none' }, colors: ['#e7711c'], histogram: { bucketSize: 10000000 } };
In the following example, we show how to expand the range of the buckets and display many
more buckets with no gap between them. The maxNumBuckets
option can be used
to increase the default number of buckets. The histogram.minValue
and
histogram.maxValue
options will expand the range of the buckets, but note
that if there is data outside this range, these options will not shrink the range.
This example also shows that you can specify the ticks to display for each of the buckets using
the explicit ticks
option for the hAxis
. This does not affect the
buckets themselves, but only how the ticks are displayed.
Note also that we specify the
chartArea.width
such that the number of buckets will fit more precisely without
visual artifacts. Here are the options for this example.
var options = { title: 'Approximating Normal Distribution', legend: { position: 'none' }, colors: ['#4285F4'], chartArea: { width: 405 }, hAxis: { ticks: [-1, -0.75, -0.5, -0.25, 0, 0.25, 0.5, 0.75, 1] }, bar: { gap: 0 }, histogram: { bucketSize: 0.01, maxNumBuckets: 400, minValue: -1, maxValue: 1 } };
Multiple Series
Here's a histogram of the charges of subatomic particles, according to the Standard Model:
The above chart has one series containing all the particles. Subatomic particles can be divided into four groups: quarks, leptons, and bosons. Let's treat each as its own series:
In this chart, we use a different series (and therefore color) for
each of the four types of subatomic particle. We explicitly
set interpolateNulls
to false
to ensure that
the null values (needed because the series are of unequal length)
aren't plotted. We also set legend.maxLines
to add
another line to the legend:
var data = google.visualization.arrayToDataTable([ ['Quarks', 'Leptons', 'Gauge Bosons', 'Scalar Bosons'], [2/3, -1, 0, 0], [2/3, -1, 0, null], [2/3, -1, 0, null], [-1/3, 0, 1, null], [-1/3, 0, -1, null], [-1/3, 0, null, null], [-1/3, 0, null, null] ]); var options = { title: 'Charges of subatomic particles', legend: { position: 'top', maxLines: 2 }, colors: ['#5C3292', '#1A8763', '#871B47', '#999999'], interpolateNulls: false, };
Loading
The google.charts.load
package name
is "corechart"
.
google.charts.load("current", {packages: ["corechart"]});
The visualization's class name is google.visualization.Histogram
:
var visualization = new google.visualization.Histogram(container);
Data Format
There are two ways to populate a histogram datatable. When there's only one series:
var data = google.visualization.arrayToDataTable([ ['Name', 'Number'], ['Name 1', number1], ['Name 2', number2], ['Name 3', number3], ... ]);
...and when there are multiple series:
var data = google.visualization.arrayToDataTable([ ['Series Name 1', 'Series Name 2', 'Series Name 3', ...], [series1_number1, series2_number1, series3_number1, ...], [series1_number2, series2_number2, series3_number2, ...], [series1_number3, series2_number3, series3_number3, ...], ... ]);
No optional column roles are supported for histograms at the moment.
Configuration Options
Name | |
---|---|
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:
Type: string
Default: 'linear'
|
animation.startup |
Determines if the chart will animate on the initial draw. If Type: boolean
Default false
|
axisTitlesPosition |
Where to place the axis titles, compared to the chart area. Supported values:
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: 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'
|
bar.groupWidth |
The width of a group of bars, specified in either of these formats:
Type: number or string
Default:
The golden ratio,
approximately '61.8%'.
|
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: 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:
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: Type: Array of strings
Default: default colors
|
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
|
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:
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.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} 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 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
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 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
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. 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. 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 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
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 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. Type: object
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 Type: object
Default:
{color: 'black', fontName: <global-font-name>, fontSize: <global-font-size>}
|
hAxis.title |
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 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. 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
Type: boolean
Default: automatic
|
hAxis.slantedTextAngle |
The angle of the horizontal axis text, if it's drawn slanted. Ignored if
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.viewWindowMode |
Specifies how to scale the horizontal axis to render the values within the chart area. The following string values are supported:
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 |
The zero-based row index where the cropping window ends. Data points at this index and
higher will be cropped out. In conjunction with Ignored when Type: number
Default: auto
|
hAxis.viewWindow.min |
The zero-based row index where the cropping window begins. Data points at indices lower
than this will be cropped out. In conjunction with Ignored when Type: number
Default: auto
|
histogram.bucketSize |
Hardcode the size of each histogram bar, rather than letting it be determined algorithmically. Type: number
Default: auto
|
histogram.hideBucketItems |
Omit the thin divisions between the blocks of the histogram, making it into a series of solid bars. Type: boolean
Default: false
|
histogram.lastBucketPercentile |
When calculating the histogram's bucket size, ignore the top and bottom
Type: number
Default: 0
|
histogram.minValue |
Expand the range of buckets to include this value. Type: number
Default: auto - use data min
|
histogram.maxValue |
Expand the range of buckets to include this value. Type: number
Default: auto - use data max
|
histogram.numBucketsRule |
How to compute the default number of buckets. Possible values are:
Type: string
Default:
'sqrt' |
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
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 The options for
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
100% stacking only supports data values of type 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, 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:
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 Type: object
Default:
{color: 'black', fontName: <global-font-name>, fontSize: <global-font-size>}
|
orientation |
The orientation of the chart. When set to Type: string
Default: 'horizontal'
|
reverseCategories |
If set to true, will draw series from right to left. The default is to draw left-to-right. Type: boolean
Default: false
|
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:
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:
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:
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 Type: object
Default:
{color: 'black', fontName: <global-font-name>, fontSize: <global-font-size>}
|
tooltip |
An object with members to configure various tooltip elements. To specify properties of this object, you can use object literal notation, as shown here: {textStyle: {color: '#FF0000'}, showColorCode: true} Type: object
Default: null
|
tooltip.isHtml |
If set to true, use HTML-rendered (rather than SVG-rendered) tooltips. See Customizing Tooltip Content for more details. Note: customization of the HTML tooltip content via the tooltip column data role is not supported by the Bubble Chart visualization. Type: boolean
Default: false
|
tooltip.showColorCode |
If true, show colored squares next to the series information in the tooltip. The default is
true when 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 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:
Type: string
Default: 'focus'
|
vAxes |
Specifies properties for individual vertical axes, if the chart has multiple vertical axes.
Each child object is a
To specify a chart with multiple vertical axes, first define a new axis using
{ 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 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 |
Type: number
Default: automatic
|
vAxis.baselineColor |
Specifies the color of the baseline for the vertical axis. Can be any HTML color string, for
example: 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 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,
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 .
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 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 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
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 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
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. 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 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.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
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 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. 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 |
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 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
The viewWindow will be automatically expanded to
include the min and max ticks unless you specify a
Examples:
Type: Array of elements
Default: auto
|
vAxis.title |
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 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.
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.
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:
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 Type: number
Default: auto
|
vAxis.viewWindow.min |
The minimum vertical data value to render. Ignored when 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
Return Type: none
|
getAction(actionID) |
Returns the tooltip action object with the requested Return Type: object
|
getBoundingBox(id) |
Returns an object containing the left, top, width, and height of chart element
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):
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:
Call this after the chart is drawn. Return Type: object
|
getHAxisValue(xPosition, optional_axis_index) |
Returns the horizontal data value at Example: 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 bars, legend entries and categories.
For this chart, only one entity can be selected at any given moment.
Return Type: Array of selection elements
|
getVAxisValue(yPosition, optional_axis_index) |
Returns the vertical data value at Example: Call this after the chart is drawn. Return Type: number
|
getXLocation(dataValue, optional_axis_index) |
Returns the pixel x-coordinate of Example: Call this after the chart is drawn. Return Type: number
|
getYLocation(dataValue, optional_axis_index) |
Returns the pixel y-coordinate of Example: Call this after the chart is drawn. Return Type: number
|
removeAction(actionID) |
Removes the tooltip action with the requested Return Type:
none |
setAction(action) |
Sets a tooltip action to be executed when the user clicks on the action text.
The
Any and all tooltip actions should be set prior to calling the chart's Return Type:
none |
setSelection() |
Selects the specified chart entities. Cancels any previous selection.
Selectable entities are bars, legend entries and categories.
For this chart, only one entity can be selected at a time.
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
|
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. A bar correlates 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). 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. A bar correlates 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). 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 Properties: none
|
select |
Fired when the user clicks a visual entity. To learn what has been selected, call
Properties: none
|
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