Radar chart
- Example
- The angles (coordinates) properties
- Properties
- Methods
- Data properties that are used on the points
- Events
Example
<script>
// Some data that's to be shown on the Radar chart
. For multiple
// lines it should be an array of arrays
// data = [50,57,54,59,56];
data = [
[50,58,54,59,56],
[90,84,86,98,86]
];
new RGraph.SVG.Radar({
id: 'chart-container',
data: data,
options: {
colors: ['black', 'red'],
tickmarksStyle: 'circle',
tickmarksSize: 5,
linewidth: 2,
labels: ['John','Jay','June','Jocy','Joseph'],
labelsBold: true,
labelsItalic: true,
labelsSize: 20,
labelsOffset: 0,
tooltips: '<i>Results for</i> <b>%{property:labels[%{index}]}</b><br />%{key}',
tooltipsFormattedKeyLabels: ['Monday:','Tuesday:'],
tooltipsFormattedUnitsPost:'%',
tooltipsCss: {
backgroundColor: '#333',
fontWeight: 'bold',
fontSize: '14pt',
opacity: 0.85
}
}
}).draw();
</script>
The angles (coordinates) properties
The details of the points on the Radar chart
are held in two arrays called
obj.angles
and obj.angles2
. The difference is how they're
indexed. With the former, each point is appended to the array - so on a Radar chart
with two datasets where each consists of eight points - the obj.angles
array would result in having 16 elements - one per point.
The obj.angles2
array on the
other hand is indexed by the relevant dataset - to which points are appended.
So in the previous example, the angles2
array would have two elements - each
of them being another array of eight elements (one per point). These elements
are objects that consist of the following properties:
object
- The RGraphRadar chart
objectdataset
- The dataset that pertains to the pointindex
- The index of the point in the datasetx
- The actualx-axis
coordinate of the pointy
- The actualy-axis
coordinate of the pointcx
- The centerx-axis
coordinate of the pointcy
- The centery-axis
coordinate of the pointr
- The radius away from the center point that the point isangle
- The angle used to get to the endpoint (thex-axis
andy-axis
coordinates)
Properties
You can use these properties to control how the chart appears. You can set them by including them in the options section of the configuration as shown above.
- Chart configuration properties
- Margin properties
- Background properties
- Color properties
- Labels and text properties
- Shadow properties
- Title properties
- Key properties
- Tooltip properties
- Highlight properties
- Scale properties
- Tickmark properties
- Other properties
Chart configuration properties
If required, you can position the
Radar chart
using this instead of the margins.Default: null
centery
If required, you can position the
Radar chart
using this instead of the margins.Default: null
radius
If required, you can size the
Radar chart
using this instead of the margins.Default: null
Margin properties
The left margin of the chart, (the margin is where the labels and title are)).
Default: 35
marginRight
The right margin of the chart, (the margin is where the labels and title are).
Default: 35
marginTop
The top margin of the chart, (the margin is where the labels and title are).
Default: 35
marginBottom
The bottom margin of the chart, (the margin is where the labels and title are).
Default: 35
Background properties
Whether the background "grid" is displayed or not.
Default: true
backgroundGridColor
The color of the background grid.
Default: #ddd
backgroundGridRadialsCount
The number of lines emanating from the center of the
Radar chart
outwards.Default: null (linked to how many data points that you have)
backgroundGridConcentricsCount
The number of lines that go around the center of the
Radar chart
.Default: 5
backgroundGridLinewidth
The
linewidth
that is used to draw the background grid.Default: 1
backgroundGridPoly
Whether the background grid uses polygon concentric lines or circular-based ones.
Default: true
Color properties
Colors to be used for the
Radar chart
.Default: ['red', 'black', 'orange', 'green', '#6ff', '#ccc', 'pink', 'orange', 'cyan', 'maroon', 'olive', 'teal']
filled
Whether the
Radar chart
is filed or not.Default: false
filledOpacity
The
opacity
of the fill in Radar charts
.Default: 0.25
filledAccumulative
If
true
then datasets will be stacked on top of each other.Default: true
Labels and text properties
Property | Description | Default |
---|---|---|
textSize | The size of the text. | 12 |
textFont | The font used to render the text. | Arial, Verdana, sans-serif |
textColor | The color of the labels. | black |
textItalic | Whether the labels are italic or not. | false |
textBold | Whether the labels are bold or not. | false |
text | This allows you to add custom text to your chart if you want to. There's a dedicated page that describes this option here. | null |
labels | An array of labels for the chart. | [] |
labelsSize | The size of the text. | null |
labelsFont | The font used to render the text. | null |
labelsColor | The color of the labels. | null |
labelsItalic | Whether the labels are italic or not. | null |
labelsBold | Whether the labels are bold or not. | null |
labelsOffset | If you want to move the labels away from or towards the center then this is the property to use to do that. | 0 |
labelsFormattedDecimals | When using formatted labels this is the number of decimals that are applied to the %{value_formatted} macro. | 0 |
labelsFormattedPoint | When using formatted labels this is the decimal point character that's used with the %{value_formatted} macro. | . |
labelsFormattedThousand | When using formatted labels this is the thousand separator character that's used with the %{value_formatted} macro. | , |
labelsFormattedUnitsPre | When using formatted labels these are the units that are prepended to the number with the %{value_formatted} macro. | (an empty string) |
labelsFormattedUnitsPost | When using formatted labels these are the units that are appended to the number with the %{value_formatted} macro. | (an empty string) |
The size of the text.
Default: 12
textFont
The font used to render the text.
Default: Arial, Verdana, sans-serif
textColor
The color of the labels.
Default: black
textItalic
Whether the labels are italic or not.
Default: false
textBold
Whether the labels are bold or not.
Default: false
text
This allows you to add custom text to your chart if you want to. There's a dedicated page that describes this option here.
Default: null
labels
An array of labels for the chart.
Default: []
labelsSize
The size of the text.
Default: null
labelsFont
The font used to render the text.
Default: null
labelsColor
The color of the labels.
Default: null
labelsItalic
Whether the labels are italic or not.
Default: null
labelsBold
Whether the labels are bold or not.
Default: null
labelsOffset
If you want to move the labels away from or towards the center then this is the property to use to do that.
Default: 0
labelsFormattedDecimals
When using formatted labels this is the number of decimals that are applied to the
%{value_formatted}
macro.Default: 0
labelsFormattedPoint
When using formatted labels this is the decimal point character that's used with the
%{value_formatted}
macro.Default: .
labelsFormattedThousand
When using formatted labels this is the thousand separator character that's used with the
%{value_formatted}
macro.Default: ,
labelsFormattedUnitsPre
When using formatted labels these are the units that are prepended to the number with the
%{value_formatted}
macro.Default: (an empty string)
labelsFormattedUnitsPost
When using formatted labels these are the units that are appended to the number with the
%{value_formatted}
macro.Default: (an empty string)
Shadow properties
Whether or not the chart has a shadow or not.
Default: false
shadowOffsetx
The horizontal offset of the shadow.
Default: 2
shadowOffsety
The vertical offset of the shadow.
Default: 2
shadowBlur
The blurring of the shadow.
Default: 2
shadowColor
The color of the shadow.
Default: rgba(0,0,0,0.25)
Title properties
The title of the chart.
Default: (An empty string)
titleX
The specific
x-axis
coordinate of the title. This can also be a string that looks like this: "+10" or "-10" in which case it's added to the calculated position.Default: null
titleY
The specific
y-axis
coordinate of the title. This can also be a string that looks like this: "+10" or "-10" in which case it's added to the calculated position.Default: null
titleOffsetx
An offset value that is added to the calculated
x-axis
coordinate.Default: 0
titleOffsety
An offset value that is added to the calculated
y-axis
coordinate.Default: 0
titleHalign
The horizontal alignment of the title.
Default: center
titleColor
The color of the title.
Default: null
titleFont
The font used to render the title.
Default: null
titleSize
The size of the font used to render the title.
Default: null
titleBold
Whether the title is bold or not.
Default: null
titleItalic
Whether the title is italic or not.
Default: null
titleSubtitle
The subtitle of the chart. If a subtitle is specified the title is moved up to accommodate it. As such you might need to give a larger
marginTop
value.Default: (An empty string)
titleSubtitleColor
The color of the subtitle.
Default: #aaa
titleSubtitleFont
The font used to render the subtitle.
Default: null
titleSubtitleSize
The size of the font used to render the subtitle.
Default: null
titleSubtitleBold
Whether the subtitle is bold or not.
Default: null
titleSubtitleItalic
Whether the subtitle is italic or not.
Default: null
Key properties
An array of the labels that appear on the key.
Default: null
keyColors
An array of colors to be shown on the key. If not specified then the
colors
option will be used instead.Default: null
keyLabelsColor
The color of the text in the key.
Default: null
keyLabelsBold
Whether the key text is bold or not.
Default: null
keyLabelsFont
The font to use for the key text.
Default: null
keyLabelsSize
The size to use for the key text.
Default: null
ketLabelsItalic
Whether the key text is italic or not.
Default: null
keyLabelsOffsetx
The horizontal pixel offset of the key text (just the text).
Default: 0
keyLabelsOffsety
The vertical pixel offset of the key text (just the text).
Default: -1
keyOffsetx
The horizontal pixel offset of the entire key.
Default: 0
keyOffsety
The horizontal pixel offset of the entire key.
Default: 0
keyColorShape
This controls which shape should be displayed on the key. It can be a string or an array of strings. The possible options are:
circle
triangle
line
dot
rectdot
Default: rect
Tooltip properties
Property | Description | Default |
---|---|---|
tooltips | An array of tooltips for the chart. This array should NOT be multidimensional - even for multiple dataset charts. You can also check the canvas tooltips documentation for more information. | null |
tooltipsOverride | This can be a function that handles the tooltip showing instead of the default RGraph tooltips. It should look like this: tooltipsOverride: function (obj, opt)
{
// Show tooltip
} The opt is an argument that contains these items:
| null |
tooltipsEvent | The event used for tooltips (either click or mousemove . | click |
tooltipsFormattedPoint | When using formatted tooltip strings this is used as the point when using the %{value_formatted} option. | . |
tooltipsFormattedThousand | When using formatted tooltip strings this is used as the thousand separator when using the %{value_formatted} option. | , |
tooltipsFormattedDecimals | When using formatted tooltip strings this specifies the number of decimals when using the %{value_formatted} option. | 0 |
tooltipsFormattedUnitsPre | When using formatted tooltip strings these units are prepended to the number when using the %{value_formatted} option. | (an empty string) |
tooltipsFormattedUnitsPost | When using formatted tooltip strings these units are appended to the number when using the %{value_formatted} option. | (an empty string) |
tooltipsFormattedKeyLabels | The labels that are used in the formatted tooltip key. | [] (an empty array) |
tooltipsFormattedKeyColors | The colors that are used in the formatted tooltip key. Normally these are automatically taken from the colors on the chart but can be specified differently using this property. | null |
tooltipsFormattedKeyColorsShape | This is the shape that's used in the tooltip key. It can be square or circle | square |
tooltipsFormattedKeyColorsCss | By using this property you can add css values to the key color shape that appears in the tooltip key. Note the property name is "color" and not "colors" like previous properties. It should be an object of css properties like this: tooltipsFormattedKeyColorsCss : { border: "1px solid #ddd"; } | null |
tooltipsFormattedListType | With this property you can switch between an unordered list (the default) and an ordered list. Possible values are ul and ol . | ul |
tooltipsFormattedListItems | This should be a two-dimension array of the list items that are to be shown for all of the tooltips. An example of this property is:tooltipsFormattedListItems: [ ['Bill','Jerry','Berty'], // First tooltip ['Gill','Carrie','Lucy'], // Second tooltip ['Pob','Nobby','Hilda'] // Third tooltip ]You can use css to style this list - for example:.RGraph_tooltip ul#rgraph_formatted_tooltips_list li { text-align: left; color: yellow; } | null |
tooltipsFormattedTableHeaders | When showing a table in the tooltips this can be an array of headers for the table. These are added to the tooltip using th tags. | null |
tooltipsFormattedTableData | This is the data that is added to the table. This is a 3-dimensional array so it's easy to make a mistake. See the example in the canvas documentation, copy the code from it and then modify it suit. You'll create fewer bugs this way. | null) |
tooltipsPointer | By default the tooltips have a small triangular pointer that points to the shape that was clicked on. You can turn this off with this property. | true |
tooltipsPointerCss | If you want any css values applied to the tooltips pointer (a css border, fo example) then specify an object containing those values to this property. For example: tooltips: { borderLeft: 'gray 2px solid', borderBottom: 'gray 2px solid' } | null |
tooltipsPositionStatic | The new default (as of August 2020) is for tooltips to be positioned statically and not be dependent on the mouse position. If you don't want this for whatever reason, you can disable it with this setting. When you set it to false tooltips are positioned next to the mouse pointer. | true |
tooltipsCss | If you want to specify some css that gets applied to all of the tooltips, but don't want to use the RGraph.SVG.tooltips.style object (which gets applied to all of the tooltips on the page for every chart) you can use this property to give some per-object css for the tooltips. These are css styles that get applied to all of the tooltips for the specific object only. It should look like this:tooltipsCss: { fontFamily: 'Verdana', fontSize: '20pt' } | null |
tooltipsPointerOffsetx | This allows you to adjust the horizontal position of the tooltips pointer. | 0 |
tooltipsPointerOffsety | This allows you to adjust the vertical position of the tooltips pointer. | 0 |
tooltipsCssClass | The css class that's applied to the tooltip div . | RGraph_tooltip |
tooltipsOffsetx | This property allows you to shift the tooltips left or right. | 0 |
tooltipsOffsety | This property allows you to shift the tooltips up or down. | 0 |
An array of tooltips for the chart. This array should NOT be multidimensional - even for multiple dataset charts. You can also check the canvas tooltips documentation for more information.
Default: null
tooltipsOverride
This can be a function that handles the tooltip showing instead of the default RGraph tooltips. It should look like this:
tooltipsOverride: function (obj, opt)
{
// Show tooltip
}
The opt is an argument that contains these items: object
The chart object.index
The index of the element (that triggered the tooltip).sequentialIndex
The sequential index of the element that was clicked.text
The text to be used as the tooltip. Remember that this may containhtml
(or whatever else you may have specified).event
The event object (either aclick
ormousemove
event).
Default: null
tooltipsEvent
The event used for tooltips (either
click
or mousemove
.Default: click
tooltipsFormattedPoint
When using formatted tooltip strings this is used as the point when using the
%{value_formatted}
option.Default: .
tooltipsFormattedThousand
When using formatted tooltip strings this is used as the thousand separator when using the
%{value_formatted}
option.Default: ,
tooltipsFormattedDecimals
When using formatted tooltip strings this specifies the number of decimals when using the
%{value_formatted}
option.Default: 0
tooltipsFormattedUnitsPre
When using formatted tooltip strings these units are prepended to the number when using the
%{value_formatted}
option.Default: (an empty string)
tooltipsFormattedUnitsPost
When using formatted tooltip strings these units are appended to the number when using the
%{value_formatted}
option.Default: (an empty string)
tooltipsFormattedKeyLabels
The labels that are used in the formatted tooltip key.
Default: [] (an empty array)
tooltipsFormattedKeyColors
The colors that are used in the formatted tooltip key. Normally these are automatically taken from the colors on the chart but can be specified differently using this property.
Default: null
tooltipsFormattedKeyColorsShape
This is the shape that's used in the tooltip key. It can be
square
or circle
Default: square
tooltipsFormattedKeyColorsCss
By using this property you can add
css
values to the key color shape that appears in the tooltip key. Note the property name is "color" and not "colors" like previous properties. It should be an object of css
properties like this: tooltipsFormattedKeyColorsCss : { border: "1px solid #ddd"; }
Default: null
tooltipsFormattedListType
With this property you can switch between an unordered list (the default) and an ordered list. Possible values are
ul
and ol
.Default: ul
tooltipsFormattedListItems
This should be a two-dimension array of the list items that are to be shown for all of the tooltips. An example of this property is:
tooltipsFormattedListItems: [ ['Bill','Jerry','Berty'], // First tooltip ['Gill','Carrie','Lucy'], // Second tooltip ['Pob','Nobby','Hilda'] // Third tooltip ]You can use
css
to style this list - for example:.RGraph_tooltip ul#rgraph_formatted_tooltips_list li { text-align: left; color: yellow; }
Default: null
tooltipsFormattedTableHeaders
When showing a table in the tooltips this can be an array of headers for the table. These are added to the tooltip using
th
tags.Default: null
tooltipsFormattedTableData
This is the data that is added to the table. This is a 3-dimensional array so it's easy to make a mistake. See the example in the
canvas
documentation, copy the code from it and then modify it suit. You'll create fewer bugs this way.Default: null)
tooltipsPointer
By default the tooltips have a small triangular pointer that points to the shape that was clicked on. You can turn this off with this property.
Default: true
tooltipsPointerCss
If you want any
css
values applied to the tooltips pointer (a css
border, fo example) then specify an object containing those values to this property. For example: tooltips: { borderLeft: 'gray 2px solid', borderBottom: 'gray 2px solid' }
Default: null
tooltipsPositionStatic
The new default (as of August 2020) is for tooltips to be positioned statically and not be dependent on the mouse position. If you don't want this for whatever reason, you can disable it with this setting. When you set it to
false
tooltips are positioned next to the mouse pointer.Default: true
tooltipsCss
If you want to specify some
css
that gets applied to all of the tooltips, but don't want to use the RGraph.SVG.tooltips.style
object (which gets applied to all of the tooltips on the page for every chart) you can use this property to give some per-object css
for the tooltips. These are css
styles that get applied to all of the tooltips for the specific object only. It should look like this:tooltipsCss: { fontFamily: 'Verdana', fontSize: '20pt' }
Default: null
tooltipsPointerOffsetx
This allows you to adjust the horizontal position of the tooltips pointer.
Default: 0
tooltipsPointerOffsety
This allows you to adjust the vertical position of the tooltips pointer.
Default: 0
tooltipsCssClass
The
css
class that's applied to the tooltip div
.Default: RGraph_tooltip
tooltipsOffsetx
This property allows you to shift the tooltips left or right.
Default: 0
tooltipsOffsety
This property allows you to shift the tooltips up or down.
Default: 0
Highlight properties
The color of the stroke of the highlight.
Default: rgba(0,0,0,0)
highlightFill
The color of the fill of the highlight.
Default: rgba(255,255,255,0.7)
highlightLinewidth
The
linewidth
of the stroke of the highlight.Default: 1
Scale properties
Whether the scale is displayed or not.
Default: true
scaleUnitsPre
The units that are prepended to the numbers.
Default: (an empty string)
scaleUnitsPost
The units that are appended to the numbers.
Default: (an empty string)
scaleMin
The minimum scale value.
Default: 0
scaleMax
The maximum scale value.
Default: null
scalePoint
The character to use as the decimal point.
Default: .
scaleThousand
The character to use as the thousand separator.
Default: ,
scaleRound
Whether to round the maximum scale value up.
Default: false
scaleDecimals
The number of decimal places to display.
Default: 0
scaleFormatter
A function that handles all of the formatting of the value. The function should look like this:
function (obj, num) { }
Default: null
scaleBold
Whether the scale values are bold or not.
Default: null
scaleItalic
Whether the scale values are italic or not.
Default: null
scaleColor
The color of the scale labels.
Default: null
scaleSize
The size of the scale labels.
Default: null
scaleFont
The font of the scale labels.
Default: null
scaleLabelsCount
The number of scale labels.
Default: 5
Tickmark properties
The style of tickmarks that are used. You set this to false to disable tickmarks. This can be either a string or an array of tickmark styles:
circle
filledcircle
rect
filledrect
Default: circle
tickmarksLinewidth
The
linewidth
used for the tickmarks.Default: 1
tickmarksSize
The overall size of the tickmarks.
Default: 6
tickmarksFill
The fill color used for tickmarks (when in
circle
mode or rect
mode).Default: white
Other properties
Property | Description | Default |
---|---|---|
linewidth | The linewidth of the separating lines. | 1 |
responsive | This option is new to the July 2023 release (v6.13) and allows you to inline the responsive configuration instead of appending it on to the end of the object it as a function. The documentation and demo pages have been updated to use this new option. You can read more about the responsive feature by reading the responsive configuration page. | null |
The
linewidth
of the separating lines.Default: 1
responsive
This option is new to the July 2023 release (v6.13) and allows you to inline the responsive configuration instead of appending it on to the end of the object it as a function. The documentation and demo pages have been updated to use this new option. You can read more about the responsive feature by reading the responsive configuration page.
Default: null
Methods
obj.get(name)
This can be used to get properties if necessary. It's normally used after the chart is drawn if you need to get parameters (if you're doing custom coding for example).
obj.set(name, value)
This can be used to set properties if necessary. It's normally used after the chart is drawn if you need to set additional parameters or change them.
obj.getRadius(value)
This can be used to get the radius
for the given value.
obj.on(event, handler)
This function adds an event listener (such as beforedraw
or
draw
) to the chart object. For example:
obj.on('draw', function (obj)
{
// Put your code here
});
obj.exec(func)
This function can be used to execute a function (immediately). It's not event-based
(ie it doesn't run when something happens) - it just runs immediately - and only once.
You might use it when you need to get something from the chart when it's drawn and
then call the redraw function. Because this function only runs once the RGraph.SVG.redraw
function would not cause a loop - which would happen if you used the draw
event.
obj.exec(function (obj)
{
// Put your code here
});
obj.responsive(configuration)
The responsive
function helps your charts
respond to different browser window sizes and screen
resolutions. For example, for smaller screens, you
might want to have angled labels or show shorter
versions of them completely.
Update: There is now the responsive configuration option available to you and this is now the preferred method of configuration.
The responsive function and configuration option are documented on their own page here.
Data properties that are used on the points
The svg
elements that represent the points on the Radar chart
have two data attributes added to them that hold information about the indexes of the point.
These are:
data-index
data-dataset
These can be retrieved by using standard dom
methods:
element.getAttribute('data-index');
Events
RGraph supports custom events that allow you to easily add interactivity to your charts if required. The following events are available:
beforedraw
This event fires at the start of thedraw
method before anything has been done.draw
This event fires at the end of thedraw
function.firstdraw
This event fires at the end of thedraw
function - but only the first time and so it fires only once after the firstdraw
call.beforetooltip
This event fires at the start of the tooltip showing process.tooltip
This event fires after a tooltip has been shown.
new RGraph.SVG.Radar({ id: 'chart-container', data: [4,8,6,3,5,8,9], options: { } }).on('tooltip', function (obj) { console.log('The draw event has fired'); }).draw();