Graph2d is an interactive visualization chart to draw data in a 2D graph. You can freely move and zoom in the graph by dragging and scrolling in the window.
Graph2d uses HTML DOM and SVG for rendering. This allows for flexible customization using css styling.
The following code shows how to create a Graph2d and provide it with data. More examples can be found in the examples directory.
<!DOCTYPE HTML> <html> <head> <title>Graph2d or Basic Example</title> <style type="text/css"> body, html { font-family: sans-serif; } </style> <script src="../../dist/vis.js"></script> <link href="../../dist/vis.css" rel="stylesheet" type="text/css" /> </head> <body> <div id="visualization"></div> <script type="text/javascript"> var container = document.getElementById('visualization'); var items = [ {x: '2014-06-11', y: 10}, {x: '2014-06-12', y: 25}, {x: '2014-06-13', y: 30}, {x: '2014-06-14', y: 10}, {x: '2014-06-15', y: 15}, {x: '2014-06-16', y: 30} ]; var dataset = new vis.DataSet(items); var options = { start: '2014-06-10', end: '2014-06-18' }; var Graph2d = new vis.Graph2d(container, dataset, options); </script> </body> </html>
The result of the code above will be the basic example which is shown here.
The class name of the Graph2d is vis.Graph2d
.
When constructing a Graph2d, an HTML DOM container must be provided to attach
the graph to. Optionally, data an options can be provided.
Data is a vis DataSet
or an Array
, described in
section Data Format.
Options is a name-value map in the JSON format. The available options
are described in section Configuration Options.
Groups is a vis DataSet
containing groups. The available options and the method of construction
are described in section Data Format.
var graph = new vis.Graph2d(container [, data] [, groups] [, options]);For backwards compatibility, groups and options can be interchanged.
Data, options and groups can be set or changed later on using the functions
Graph2d.setItems(data)
, Graph2d.setOptions(options)
and Graph2d.setGroups(groups)
.
Graph2d can load data from an Array
, a DataSet
or a DataView
.
Objects are added to this DataSet by using the add()
function.
Data points must have properties x
, y
, and z
,
and can optionally have a property style
and filter
.
Graph2d can be provided with two types of data:
var items = [ {x: '2014-06-13', y: 30, group: 0}, {x: '2014-06-14', y: 10, group: 0}, {x: '2014-06-15', y: 15, group: 1}, {x: '2014-06-16', y: 30, group: 1}, {x: '2014-06-17', y: 10, group: 1}, {x: '2014-06-18', y: 15, group: 1} ];
Name | Type | Required | Description |
---|---|---|---|
x | Date | yes | Location on the x-axis. |
y | Number | yes | Location on the y-axis. |
group | Number or string | no | The ID of the group this point belongs to. |
label | Object | no | A label object which will be displayed near to the item. A label object has one requirement - a content property. In addition you can set the xOffset, yOffset and className for further appearance customisations |
Like the items, groups are regular JavaScript Arrays and Objects.
Using groups, items can be grouped together.
Items are filtered per group, and displayed as individual graphs. Groups can contain the properties id
,
content
, className
(optional) and options
(optional).
Groups can be applied to a timeline using the method setGroups
.
A table with groups can be created like:
var groups = new vis.DataSet(); groups.add({ id: 1, content: 'Group 1', // Optional: a field 'visible' // Optional: a field 'className' // Optional: options }) groups.add({ // more groups... });
Groups can have the following properties:
Name | Type | Required | Description |
---|---|---|---|
id | String or Number | yes | An id for the group. The group will display all items having a
property group which matches the id
of the group. |
content | String | yes | The contents of the group. This can be plain text or html code. |
className | String | no | This field is optional. A className can be used to give groups an individual css style. |
style | String | no | This field is optional. A style can be used to give groups an individual css style, and any style tags specified in style will override the definition in the className style defined in css. |
options | Object | no | This field is optional. The options can be used to give a group a specific draw style. Any options that are colored green in the Configuration Options can be used as options here. |
visible | Boolean | true | This field is optional. If false, this group will not be drawn. |
setOptions
function.
var options = { width: '100%', height: '400px', style: 'surface' };The options colored in green can also be used as options for the groups. All options are optional.
Name | Type | Default | Description |
---|---|---|---|
defaultGroup | String | 'default' | This is the label for the default, ungrouped items when shown in a legend. |
barChart | Object | Define the properties of the barchart style. | |
barChart.align | String | 'center' | The alignment of the bars with regards to the coordinate. The options are 'left', 'right' or 'center'. |
barChart.sideBySide | Boolean | false | If two datapoints of a barchart overlap, they are drawn over eachother by default. If sideBySide is set to true, they will be drawn side by side. See example 10 for more information. When using groups, see example 11. |
barChart.width | Number | 50 | The width of the bars. |
dataAxis | Object | Define the properties of the left and right dataAxis. | |
dataAxis.alignZeros | Boolean | true | When using multiple axis, the right one is slaved to the left one. If you need to ensure that the zero-lines are on the same height, you can turn this option on. |
dataAxis.icons | Boolean | false | Toggle the drawing of automatically generated icons the Y axis. |
dataAxis.left.format | Function | Insert a custom function on how to format the label. The function will receive a numeric value and has to return a string. Default function is:
function (value) { return value; }which does nothing to it. |
|
dataAxis.left.range.min | Number | undefined | Set the minimum value of the left y-Axis. |
dataAxis.left.range.max | Number | undefined | Set the maximum value of the left y-Axis. |
dataAxis.left.title.style | String | undefined | Set the title style for the left axis. This is a css string and it will override the attributes set in the class. |
dataAxis.left.title.text | String | undefined | Set the title for the left axis. |
dataAxis.right.format | Function | Same explaination as the left side. | |
dataAxis.right.range.min | Number | undefined | Set the minimum value of the right y-Axis. |
dataAxis.right.range.max | Number | undefined | Set the maximum value of the right y-Axis. |
dataAxis.right.title.style | String | undefined | Set the title style for the right axis. This is a css string and it will override the attributes set in the class. |
dataAxis.right.title.text | String | undefined | Set the title for the right axis. |
dataAxis.showMinorLabels | Boolean | true | Toggle the drawing of the minor labels on the Y axis. |
dataAxis.showMajorLabels | Boolean | true | Toggle the drawing of the major labels on the Y axis. |
dataAxis.visible | Boolean | true | Show or hide the data axis. |
dataAxis.width | Number or String | '40px' | Set the (minimal) width of the yAxis. The axis will resize to accomodate the labels of the Y values. |
drawPoints | Boolean or Object | true | Toggle the drawing of the datapoints with the default settings. |
drawPoints.enabled | Boolean | true | Toggle the drawing of the datapoints. |
drawPoints.size | Number | 6 | Determine the size at which the data points are drawn. |
drawPoints.style | String | 'square' | Determine the shape of the data points. The options are 'square' or 'circle'. |
graphHeight | Number or String | '400px' | This is the height of the graph SVG canvas. If it is larger than the height of the outer frame, you can drag up and down the vertical direction as well as the usual horizontal direction. |
groups.visibility | Object | You can use this to toggle the visibility of groups per graph2D instance. This is different from setting the visibility flag of the groups since this is not communicated across instances of graph2d. Take a look at Example 14 for more explanation. | |
interpolation | Boolean or Object | true | Toggle the interpolation with the default settings. For more customization use the JSON format. |
interpolation.enabled | Boolean | true | Toggle the interpolation. |
interpolation.parametrization | String | 'centripetal' | Define the type of parametrizaion for the catmullRom interpolation. Example 7 shows the different parametrizations. The options are 'centripetal' (best results), 'chordal' and 'uniform'. Uniform is the computationally cheapest variant. If interpolation is disabled, linear interpolation is used. |
legend | Boolean or Object | false | Toggle the legend with the default settings. |
legend.enabled | Boolean | false | Toggle the legend. |
legend.icons | Boolean | true | Show automatically generated icons on the legend. |
legend.left.visible | Boolean | true | Both axis, left and right, have a corresponding legend. This toggles the visibility of the legend that is coupled with the left axis. |
legend.left.position | String | 'top-left' | Determine the position of the legend coupled to the left axis. Options are 'top-left', 'top-right', 'bottom-left' or 'bottom-right'. |
legend.right.visible | Boolean | true | This toggles the visibility of the legend that is coupled with the right axis. |
legend.right.position | String | 'top-right' | Determine the position of the legend coupled to the right axis. Options are 'top-left', 'top-right', 'bottom-left' or 'bottom-right'. |
sampling | Boolean | true | If sampling is enabled, Graph2d will automatically determine the amount of points per pixel. If there are more than 1 point per pixel, not all points will be drawn. Disabling sampling will cause a decrease in performance. |
sort | Boolean | true | This determines if the items are sorted automatically. They are sorted by the x value. If sort is enabled, more optimizations are possible, increasing the performance. |
stack | Boolean | true | If stack is enabled, the graphs will be stacked upon eachother when applicable. This currently only works with bar graphs but linegraph support is being worked on. |
shaded | Boolean or Object | false | Toggle a shaded area with the default settings. |
shaded.enabled | Boolean | false | This toggles the shading. |
shaded.orientation | String | 'bottom' | This determines if the shaded area is at the bottom or at the top of the curve. The options are 'bottom' or 'top'. |
shaded.style | String | undefined | Set the style for the shading. This is a css string and it will override the attributes set in the class. |
style | String | 'line' | This allows the user to define if this should be a linegraph, barchart or pointcloud. The options are: 'line', 'bar', 'points'. |
yAxisOrientation | String | 'left' | This defines with which axis, left or right, the graph is coupled. Example 5 shows groups with different Y axis. If no groups are coupled with an axis, it will not be shown. |
Graph2d is built upon the framework of the timeline. These options from the timeline can be used with graph2D. All options are optional.
Name | Type | Default | Description |
---|---|---|---|
autoResize | Boolean | true | If true, the Timeline will automatically detect when its container is resized, and redraw itself accordingly. If false, the Timeline can be forced to repaint after its container has been resized using the function redraw() . |
configure | boolean or function | false |
When true, a configurator is loaded where all configuration options of the Graph2d can be changed live.
The displayed options can be filtered by providing a filter function. This function is invoked with two arguments: the current option and the path (an Array) of the option within the options object. The option will be displayed when the filter function returns true. For example to only display format options:
function (option, path) { return option === 'format' || path.indexOf('format') !== -1; } |
clickToUse | Boolean | false | When a Graph2d is configured to be clickToUse , it will react to mouse and touch events only when active.
When active, a blue shadow border is displayed around the Graph2d. The Graph2d is set active by clicking on it, and is changed to inactive again by clicking outside the Graph2d or by pressing the ESC key. |
end | Date or Number or String | none | The initial end date for the axis of the timeline. If not provided, the latest date present in the items set is taken as end date. |
format | Object | none |
Apply custom date formatting of the labels on the time axis. The default value of format is:
{ minorLabels: { millisecond:'SSS', second: 's', minute: 'HH:mm', hour: 'HH:mm', weekday: 'ddd D', day: 'D', month: 'MMM', year: 'YYYY' }, majorLabels: { millisecond:'HH:mm:ss', second: 'D MMMM HH:mm', minute: 'ddd D MMMM', hour: 'ddd D MMMM', weekday: 'MMMM YYYY', day: 'MMMM YYYY', month: 'YYYY', year: '' } }For values which not provided in the customized options.format , the default values will be used.
All available formatting syntax is described in the docs of moment.js.
|
height | Number or String | none | The height of the timeline in pixels or as a percentage.
When height is undefined or null, the height of the timeline is automatically
adjusted to fit the contents.
It is possible to set a maximum height using option maxHeight
to prevent the timeline from getting too high in case of automatically
calculated height.
|
hiddenDates | Object | none | This option allows you to hide specific timespans from the time axis. The dates can be supplied as an object:
{start: '2014-03-21 00:00:00', end: '2014-03-28 00:00:00', [repeat:'daily']} or as an Array of these objects. The repeat argument is optional.
The possible values are (case-sensitive): daily, weekly, monthly, yearly . To hide a weekend, pick any Saturday as start and the following Monday as end
and set repeat to weekly.
|
locale | String | none | Select a locale for the Graph2d. See section Localization for more information. |
locales | Object | none | A map with i18n locales. See section Localization for more information. |
max | Date or Number or String | none | Set a maximum Date for the visible range. It will not be possible to move beyond this maximum. |
maxHeight | Number or String | none | Specifies the maximum height for the Timeline. Can be a number in pixels or a string like "300px". |
min | Date or Number or String | none | Set a minimum Date for the visible range. It will not be possible to move beyond this minimum. |
minHeight | Number or String | none | Specifies the minimum height for the Timeline. Can be a number in pixels or a string like "300px". |
moveable | boolean | true |
Specifies whether the Timeline can be moved and zoomed by dragging the window.
See also option zoomable .
|
orientation | String | 'bottom' | Orientation of the timeline: 'top', 'bottom' (default), or 'both'. If orientation is 'bottom', the time axis is drawn at the bottom. When 'top', the axis is drawn on top. When 'both', two axes are drawn, both on top and at the bottom. |
showCurrentTime | Boolean | true | Show a vertical bar at the current time. |
showCustomTime | Boolean | false | Show a vertical bar displaying a custom time. This line can be dragged by the user. The custom time can be utilized to show a state in the past or in the future. When the custom time bar is dragged by the user, the event timechange is fired repeatedly. After the bar is dragged, the event timechanged is fired once. |
showMajorLabels | Boolean | true | By default, the timeline shows both minor and major date labels on the
time axis.
For example the minor labels show minutes and the major labels show hours.
When showMajorLabels is false , no major labels
are shown. |
showMinorLabels | Boolean | true | By default, the timeline shows both minor and major date labels on the
time axis.
For example the minor labels show minutes and the major labels show hours.
When showMinorLabels is false , no minor labels
are shown. When both showMajorLabels and
showMinorLabels are false, no horizontal axis will be
visible. |
showMajorLines | Boolean | true | By default, the timeline shows both minor and major date lines on the time axis. You can use this option to hide the lines from the major dates. |
showMinorLines | Boolean | true | By default, the timeline shows both minor and major date lines on the time axis. You can use this option to hide the lines from the minor dates. |
start | Date or Number or String | none | The initial start date for the axis of the timeline. If not provided, the earliest date present in the events is taken as start date. |
timeAxis | Object | Object |
Specify a fixed scale and step size for the time axis. |
timeAxis.scale | String | none | Set a fixed scale for the time axis of the Timeline. Choose from 'millisecond' , 'second' , 'minute' , 'hour' , 'weekday' , 'day' , 'month' , 'year' . Example usage:
var options = { timeAxis: {scale: 'minute', step: 5} } |
timeAxis.step | number | 1 |
Set a fixed step size for the time axis. Only applicable when used together with timeAxis.scale .
Choose for example 1, 2, 5, or 10. |
width | String | '100%' | The width of the timeline in pixels or as a percentage. |
zoomMax | Number | 315360000000000 | Set a maximum zoom interval for the visible range in milliseconds. It will not be possible to zoom out further than this maximum. Default value equals about 10000 years. |
zoomMin | Number | 10 | Set a minimum zoom interval for the visible range in milliseconds. It will not be possible to zoom in further than this minimum. |
The Graph2d supports the following methods.
Method | Return Type | Description |
---|---|---|
destroy() | none | Destroy the Graph2d. The Graph2d is removed from memory. all DOM elements and event listeners are cleaned up. |
fit() | none | Adjust the visible window such that it fits all items. |
getCurrentTime() | Date | Get the current time. Only applicable when option showCurrentTime is true.
|
getCustomTime() | Date | Retrieve the custom time. Only applicable when the option showCustomTime is true.
|
getEventProperties(event) | Object |
Returns an Object with relevant properties from an event:
|
getLegend(groupId, iconWidth, iconHeight) | SVGelement, String, String | Returns an object containing an SVG element with the icon of the group (size determined by iconWidth and iconHeight), the label of the group (content) and the yAxisOrientation of the group (left or right). |
getWindow() | Object | Get the current visible window. Returns an object with properties start: Date and end: Date . |
getItemRange() | Object | Get the range of all the items as an object containing min: Date and max: Date . |
isGroupVisible(groupId) | Boolean | This checks if the visible option of the supplied group (by ID) is true or false. |
moveTo(time [, options]) | none | Move the window such that given time is centered on screen. Parameter time can be a Date , Number , or String . Available options:
|
on(event, callback) | none | Create an event listener. The callback function is invoked every time the event is triggered. Avialable events: rangechange , rangechanged , select . The callback function is invoked as callback(properties) , where properties is an object containing event specific properties. See section Events for more information. |
off(event, callback) | none | Remove an event listener created before via function on(event, callback) . See section Events for more information. |
redraw() | none | Force a redraw of the Graph2d. Can be useful to manually redraw when option autoResize=false. |
setCurrentTime(time) | none | Set a current time. This can be used for example to ensure that a client's time is synchronized with a shared server time.
time can be a Date object, numeric timestamp, or ISO date string.
Only applicable when option showCurrentTime is true. |
setCustomTime(time) | none | Adjust the custom time bar. Only applicable when the option showCustomTime is true. time can be a Date object, numeric timestamp, or ISO date string.
|
setGroups(groups) | none | Set a data set with groups for the Graph2d.
groups can be an Array with Objects,
a DataSet, or a DataView. For each of the groups, the items of the
Graph2d are filtered on the property group , which
must correspond with the id of the group.
|
setItems(items) | none | Set a data set with items for the Graph2d.
items can be an Array with Objects,
a DataSet, or a DataView.
|
setOptions(options) | none | Set or update options. It is possible to change any option of the Graph2d at any time. You can for example switch orientation on the fly. |
setWindow(start, end) | none | Set the current visible window. The parameters start and end can be a Date , Number , or String . If the parameter value of start or end is null, the parameter will be left unchanged. |
Graph2d fires events when changing the visible window by dragging, when selecting items, and when dragging the custom time bar.
Here an example on how to listen for a rangeChanged
event. A listener can be removed via the function off
:
function onChange (properties) { alert('changed!'); } // add event listener Graph2d.on('rangechanged', onChange); // do stuff... // remove event listener Graph2d.off('rangechanged', onChange);
The following events are available.
Name | Properties | Description |
---|---|---|
click |
Passes a properties object as returned by the method Graph2d.getEventProperties(event) .
|
Fired when clicked inside the Graph2d. |
contextmenu |
Passes a properties object as returned by the method Graph2d.getEventProperties(event) .
|
Fired when right-clicked inside the Graph2d. Note that in order to prevent the context menu from showing up, default behavior of the event must be stopped:
graph2d.on('contextmenu', function (props) { alert('Right click!'); props.event.preventDefault(); }); |
doubleClick |
Passes a properties object as returned by the method Graph2d.getEventProperties(event) .
|
Fired when double clicked inside the Graph2d. |
finishedRedraw | none. | Fired after a redraw is complete. When moving the Graph2d around, this could be fired frequently. |
rangechange |
|
Fired repeatedly when the user is dragging the Graph2d window. |
rangechanged |
|
Fired once after the user has dragged the Graph2d window. |
timechange |
|
Fired repeatedly when the user is dragging the custom time bar. Only available when the custom time bar is enabled. |
timechanged |
|
Fired once after the user has dragged the custom time bar. Only available when the custom time bar is enabled. |
Graph2d can be localized. For localization, Graph2d depends largely on the localization of moment.js. Locales are not included in vis.js by default. To enable localization, moment.js must be loaded with locales. Moment.js offers a bundle named "moment-with-locales.min.js" for this and there are various alternative ways to load locales.
To set a locale for the Graph2d, specify the option locale
:
var options = { locale: 'nl' };
locales
:
var options = { locales: { // create a new locale mylocale: { current: 'current', time: 'time', } }, // use the new locale locale: 'mylocale' };
Language | Code |
English |
en en_EN en_US
|
Dutch |
nl nl_NL nl_BE
|
All parts of the Graph2d have a class name and a default css style just like the Graph2d. The styles can be overwritten, which enables full customization of the layout of the Graph2d.
Additionally, Graph2d has 10 preset styles for graphs, which are cycled through when loading groups. These styles can be overwritten as well, along with defining your own classes to style the graphs! Example 4 and example 5 show the usage of custom styles.