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RGraph is a JavaScript charts library based on HTML5 SVG and canvas. RGraph is mature (over 15 years old) and has a wealth of features making it an ideal choice to show charts on your website.

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RGraph can be used for free under the GPL or if that doesn't suit your situation there's an inexpensive (£99) commercial license available.

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Get the latest version of RGraph (version 6.16) from the download page. There's also older versions available, minified files and links to cdnjs.com hosted libraries.

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Rose chart

Example

An example of a Rose chart with tooltips
<script>
    data   = [10,5,8,3,9,4,6,10,5,3,6,8,4,9];
    labels = ['John','Richard','Paul','Pete','Lou','Olga','Neil','Ken','Luis','John','Gary','Paul','Fay','Will'];

    new RGraph.Rose({
        id: 'cvs',
        data: data,
        options: {
            colors: ['red'],
            backgroundGridRadialsCount: 0,
            labels: labels,
            tooltips: '%{key}',
            tooltipsFormattedUnitsPost: 'kg',
            tooltipsFormattedKeyLabels: labels,
            margin: 5,
            tooltipsCss: {
                fontSize: '20pt',
                boxShadow: '',
                textAlign: 'left'
            },
            textSize: 16
        }
    }).draw();
</script>

The data_seq property

If your data is a multi-dimensional array (ie on a stacked Rose chart) then one member variable may be of interest to you - the obj.data_seq variable. This is a flattened view of the array of data that you pass to the Rose chart that may be useful in some circumstances. One of the demos shows this variable being used to get the value of the relevant piece of data.

This variable isn't really necessary for non-equi-angular or regular non-stacked Rose charts.

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

Name: centerx
Description: 
If required, you can position the Rose chart using this instead of the margins. As well as a number, that gives the exact coordinate of the center position of the chart, this can also be a string like this: centerx: '+25' or this: centerx: '-40' which is then used to adjust the calculated coordinate.
Default: null
Name: centery
Description: 
If required, you can position the Rose chart using this instead of the margins. As well as a number, that gives the exact coordinate of the center position of the chart, this can also be a string like this: centery: '+25' or this: centery: '-40' which is then used to adjust the calculated coordinate.
Default: null
Name: radius
Description: 
If required, you can size the Rose chart using this instead of the margins. As well as a number, that gives the exact size of the chart, this can also be a string like this: radius: '+25' or this: radius: '-40' which is then used to adjust the calculated coordinate.
Default: null
Name: anglesStart
Description: 
If you want the chart to start at an angle other than the north axis - you can use this (keep in mind that this is specified in radians).
Default:  0

Background properties

Name: backgroundGridRadialsCount
Description: 
To control the number of "spokes" that the background grid has you can use this property.
Default: null
Name: backgroundGridCirclesCount
Description: 
Using this option you can specify the exact number of background circles.
Default: null
Name: backgroundGridRadialsOffset
Description: 
The offset that is applied to the background grid radial lines (this is measured in radians).
Default:  0
Name: backgroundGridColor
Description: 
The color of the background grid.
Default: #ccc

Axes properties

Name: axes
Description: 
Whether the axes should be shown or not.
Default: false
Name: axesColor
Description: 
The color of the axes.
Default: black
Name: axesLinewidth
Description: 
The linewidth of the axes.
Default: 1
Name: axesTickmarks
Description: 
Whether the axes have tickmarks or not.
Default: true

Margin properties

Name: marginLeft
Description: 
The left margin of the chart, (the margin is where the labels and title are)).
Default: 35
Name: marginRight
Description: 
The right margin of the chart, (the margin is where the labels and title are).
Default: 35
Name: marginTop
Description: 
The top margin of the chart, (the margin is where the labels and title are).
Default: 35
Name: marginBottom
Description: 
The bottom margin of the chart, (the margin is where the labels and title are).
Default: 35
Name: margin
Description: 
This is the margin that is on either side of each segment. This allows you to have a gap between each segment. It is the size of the gap in degrees. It doesn't apply to non-equi-angular Rose charts - only regular and stacked Rose charts.
Default: 5

Color properties

Name: colors
Description: 
An array of colors to be used by the chart.
Default: ['red', 'rgb(0,255,255)', 'rgb(0,255,0)', 'gray', 'blue', 'rgb(255,128,255)','green', 'pink', 'gray', 'aqua']
Name: colorsAlpha
Description: 
Instead of using rgba, you can use color definitions such as red along with this setting to add transparency.
Default: null
Name: colorsSequential
Description: 
Because of the new (as of July 2011) support for grouped Rose charts, the way colors are used has changed. So to have them used sequentially as before the change, you will need to set this option to true.
Default: false
Name: colorsStroke
Description: 
This is the color of the stroke (the outline) used when drawing the segments.
Default: rgba(0,0,0,0)

Shadow properties

Name: shadow
Description: 
Whether the shadow is enabled or not.
Default: false
Name: shadowColor
Description: 
The color of the shadow.
Default: #aaa
Name: shadowOffsetx
Description: 
The X offset of the shadow.
Default:  0
Name: shadowOffsety
Description: 
The Y offset of the shadow.
Default:  0
Name: shadowBlur
Description: 
The magnitude of the shadow blurring effect.
Default: 15

Labels and text properties

Name: textAccessible
Description: 
A new feature in 2016 that allows you to use dom text in place of canvas text. It makes for a much higher quality text that you can also select if desired (for copy/paste operations). It won't fit all situations and you can read more about the DOM text feature here. A good way to control borders/margins/padding etc is not to set them on the canvas but to wrap the canvas in a div and set them on that like this:
<div style="margin-left: 50px; display: inline-block">
    <canvas id="cvs" width="650" height="250"></canvas>
</div>
Default: false
Name: textAccessibleOverflow
Description: 
This can be visible or hidden and it controls whether the text is clipped to the edges of the canvas. It defaults to be visible and means you can set small margins if you wish.
Default: visible
Name: textAccessiblePointerevents
Description: 
This controls whether the dom text responds to mouse-based events or not (it sets the pointer-events css property to none).
Default: true
Name: textBold
Description: 
Whether the text is bold or not.
Default: false
Name: textItalic
Description: 
Whether the text is italic or not.
Default: false
Name: textFont
Description: 
The font used to render the text.
Default: Arial, Verdana, sans-serif
Name: textColor
Description: 
The color of the labels.
Default: black
Name: textSize
Description: 
The size of the text.
Default: 12
Name: labels
Description: 
The labels, if any, for the chart. You can also give this option a string if you prefer and use formatted labels.
Default: none
Name: labelsColor
Description: 
The color of the labels.
Default: null
Name: labelsFont
Description: 
The font used to render the labels.
Default: null
Name: labelsSize
Description: 
The size of the labels.
Default: null
Name: labelsBold
Description: 
Whether the labels are bold or not.
Default: null
Name: labelsItalic
Description: 
Whether the labels are italic or not.
Default: null
Name: labelsPosition
Description: 
This can be either center or edge and determines the position of the labels.
Default: center
Name: labelsOffsetRadius
Description: 
To offset the labels either away from or towards the Rose chart then this is the property to use for that.
Default:  0
Name: labelsFormattedDecimals
Description: 
When using formatted labels this is the number of decimals that are applied to the %{value_formatted} macro.
Default:  0
Name: labelsFormattedPoint
Description: 
When using formatted labels this is the decimal point character that's used with the %{value_formatted} macro.
Default: .
Name: labelsFormattedThousand
Description: 
When using formatted labels this is the thousand separator character that's used with the %{value_formatted} macro.
Default: ,
Name: labelsFormattedUnitsPre
Description: 
When using formatted labels these are the units that are prepended to the number with the %{value_formatted} macro.
Default: (an empty string)
Name: labelsFormattedUnitsPost
Description: 
When using formatted labels these are the units that are appended to the number with the %{value_formatted} macro.
Default: (an empty string)
Name: labelsClass
Description: 
This property allows you to add your own css class to the labels which you can then use for styling purposes or to make retrieving the span tags easier (the dom elements). If you inspect the labels in your browser's javascript console (you will first need to enable the textAccessiblePointerevents property) you will be able to see the other css classes that are assigned to the labels.
Default: [none]
Name: labelsAxes
Description: 
This controls the axes that show the scale labels. Each letter stands for the appropriate axis (North, South, East and West).
Default: n
Name: labelsAxesCount
Description: 
This determines the number of labels that are displayed on the axes.
Default: 5
Name: labelsAxesFont
Description: 
The font used by the axes labels.
Default: null
Name: labelsAxesSize
Description: 
The size of the axes labels.
Default: null
Name: labelsAxesColor
Description: 
The color of the axes labels.
Default: null
Name: labelsAxesBold
Description: 
Whether the labels are bold or not.
Default: null
Name: labelsAxesItalic
Description: 
Whether the labels are italic or not.
Default: null
Name: labelsAxesOffsetx
Description: 
This allows you finer-grained control in the horizontal direction over the positioning of the axes labels.
Default:  0
Name: labelsAxesOffsety
Description: 
This allows you finer-grained control in the vertical direction over the positioning of the axes labels.
Default:  0
Name: text
Description: 
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

Title properties

Name: title
Description: 
The title of the chart, if any.
Default: null
Name: titleFont
Description: 
The font that the title is rendered in. If not specified the textFont setting is used (usually Arial).
Default: null
Name: titleSize
Description: 
The size of the title. If not specified the size is usually 4pt bigger than the textSize setting.
Default: null
Name: titleBold
Description: 
Whether the title is bold or not.
Default: null
Name: titleItalic
Description: 
Whether the title is italic or not.
Default: null
Name: titleColor
Description: 
The color of the title.
Default: null
Name: titleX
Description: 
To give the exact X coordinate for the title - use this. This can also be a string like this: "-5" - in which case it's converted to a number and added to the calculated coordinate - allowing you to adjust the calculated coordinate.
Default: null
Name: titleY
Description: 
To give the exact Y coordinate for the title - use this. This can also be a string like this: "-5" - in which case it's converted to a number and added to the calculated coordinate - allowing you to adjust the calculated coordinate.
Default: null
Name: titleHalign
Description: 
The horizontal alignment of the title.
Default: center (can change depending on other options)
Name: titleValign
Description: 
The vertical alignment of the title.
Default: center (can change depending on other options)
Name: titleOffsetx
Description: 
You can use this property to adjust the positioning of the title in the horizontal direction (positive values adjust the title to the right and negative values adjust it to the left).
Default:  0
Name: titleOffsety
Description: 
You can use this property to adjust the positioning of the title in the vertical direction (positive values adjust the title downwards and negative values adjust it upwards).
Default:  0
Name: titleSubtitle
Description: 
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: null
Name: titleSubtitleSize
Description: 
The size of the font used to render the subtitle.
Default: null
Name: titleSubtitleColor
Description: 
The color of the subtitle.
Default: #aaa
Name: titleSubtitleFont
Description: 
The font used to render the subtitle.
Default: null
Name: titleSubtitleBold
Description: 
Whether the subtitle is bold or not.
Default: null
Name: titleSubtitleItalic
Description: 
Whether the subtitle is italic or not.
Default: null
Name: titleSubtitleOffsetx
Description: 
Use this property to adjust the horizontal position of the subtitle.
Default:  0
Name: titleSubtitleOffsety
Description: 
Use this property to adjust the vertical position of the subtitle.
Default:  0

Scale properties

Name: scaleMax
Description: 
This can be set to control the maximum value of the scale. It's so-called to maintain a degree of api compatibility across chart libraries.
Default: null
Name: scaleRound
Description: 
Whether to round the maximum scale value up or not. This will produce slightly better scales in some instances.
Default: null
Name: scalePoint
Description: 
The character that's used as the decimal point.
Default: .
Name: scaleThousand
Description: 
The character that's used as the thousand separator.
Default: ,
Name: scaleDecimals
Description: 
This stipulates how many decimal places there are.
Default:  0
Name: scaleUnitsPre
Description: 
The units that are prepended to the scale labels.
Default: none
Name: scaleUnitsPost
Description: 
The units that are appended to the scale labels.
Default: none

Key properties

The key properties are documented on the key documentation page.

Interactive features properties

Name: tooltips
Description: 
A numerically indexed array of tooltips that are shown when a bar is clicked. These can contain html.
Default: An empty array
Name: tooltipsEvent
Description: 
This is the event that triggers the tooltips. It can be either click or mousemove.
Default: click
Name: tooltipsEffect
Description: 
The effect used for showing tooltips. Possible values are slide fade or none.
Default: slide
Name: tooltipsOverride
Description: 
If you wish to handle showing tooltips yourself, this should be a function object which does just that. There's more information on the tooltips documentation page.
Default: null
Name: tooltipsFormattedPoint
Description: 
When using formatted tooltip strings this is used as the point when using the %{value_formatted} option.
Default: .
Name: tooltipsFormattedThousand
Description: 
When using formatted tooltip strings this is used as the thousand separator when using the %{value_formatted} option.
Default: ,
Name: tooltipsFormattedDecimals
Description: 
When using formatted tooltip strings this specifies the number of decimals when using the %{value_formatted} option.
Default:  0
Name: tooltipsFormattedUnitsPre
Description: 
When using formatted tooltip strings these units are prepended to the number when using the %{value_formatted} option.
Default: (an empty string)
Name: tooltipsFormattedUnitsPost
Description: 
When using formatted tooltip strings these units are appended to the number when using the %{value_formatted} option.
Default: (an empty string)
Name: tooltipsFormattedKeyColors
Description: 
When using formatted tooltip strings you can give specific colors for the %{key} option to use.
Default: null
Name: tooltipsFormattedKeyColorsShape
Description: 
This is the shape that's used in the tooltip key. It can be square or circle
Default: square
Name: tooltipsFormattedKeyColorsCss
Description: 
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
Name: tooltipsFormattedKeyLabels
Description: 
When using formatted tooltip strings these are the labels that are displayed.
Default: [] (an empty array)
Name: tooltipsFormattedListType
Description: 
With this property you can switch between an unordered list (the default) and an ordered list. Possible values are ul and ol.
Default: ul
Name: tooltipsFormattedListItems
Description: 
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
Name: tooltipsFormattedTableHeaders
Description: 
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
Name: tooltipsFormattedTableData
Description: 
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, copy the code from it and then modify it suit. You'll create fewer bugs this way.
Default: null)
Name: tooltipsPointer
Description: 
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
Name: tooltipsPointerCss
Description: 
If you want any css values applied to the tooltips pointer (a css border, for example) then specify an object containing those values to this property. For example:
tooltipsPointerCss: {
    borderLeft: 'gray 2px solid',
    borderBottom: 'gray 2px solid'
}
Default: null
Name: tooltipsPointerOffsetx
Description: 
This allows you to adjust the vertical position of the tooltips pointer.
Default:  0
Name: tooltipsPointerOffsety
Description: 
This allows you to adjust the vertical position of the tooltips pointer (for example, if you add a border you may need to move it down slightly).
Default:  0
Name: tooltipsPositionStatic
Description: 
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
Name: tooltipsCss
Description: 
If you want to specify some css that gets applied to all of the tooltips, but don't want to use the RGraph.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
Name: tooltipsCssClass
Description: 
This is the name of the css class the chart uses.
Default: RGraph_tooltip
Name: tooltipsOffsetx
Description: 
This property allows you to shift the tooltips left or right.
Default:  0
Name: tooltipsOffsety
Description: 
This property allows you to shift the tooltips up or down.
Default:  0
Name: tooltipsHotspotIgnore
Description: 
This can be a number of things and can be used to ignore certain tooltip hotspots - which can allow charts to the rear to be clickable. There's an example of this in the download archive called pie-tooltipshotspotignore.html. You can use the transparent color to allow the rear chart to be seen in such a case. It can be:
  • A single boolean value (ie true or false) to enable or disable all of the hotspots - true means the hotspot will be ignored
  • A single number (the zero-indexed number corresponding to the hotspot to ignore)
  • An array of numbers (the numbers are the indexes of hotspots to ignore)
  • An array of boolean true or false values - the position of these values correspond to the index(es) of the segments to ignore (for example [false, false, true, false, false] - true means the corresponding hotspot will be ignored)
Default: null
Name: contextmenu
Description: 
An array of context menu items. More information about context menus is here.
Default: [] (An empty array)
Name: annotatable
Description: 
Whether annotations are enabled for the chart (ie you can draw on the chart interactively.
Default: false
Name: annotatableColor
Description: 
If you do not allow the use of the palette, then this will be the only color allowed for annotations.
Default: black
Name: annotatableLinewidth
Description: 
This is the linewidth of the annotations.
Default: 1

Miscellaneous properties

Name: highlightStyle
Description: 
By default this is null but you can set it to a function if you wish so that function is called to do the chart highlighting. It's passed the shape object as an argument. As of version 5.23 you can also set this to invert as well. If you do this on a dark background you may find that you need to change the highlightFill color setting as well.
Default: null
Name: highlightStroke
Description: 
If you use tooltips, this controls the color of the highlight stroke.
Default: black
Name: highlightFill
Description: 
If you use tooltips, this controls the color of the highlight fill.
Default: rgba(255,255,255,0.5)
Name: variant
Description: 
This option can be either stacked (the default) or non-equi-angular. Just because this option is set to stacked does not automatically mean your chart is stacked. If you don't supply the appropriate data your chart may well appear as a regular Rose chart. Examples of appropriate data:

A regular Rose chart

var rose = new RGraph.Rose({
    id: 'cvs',
    data: [8,5,4,8,6,7,2,3,5,8],
    options: {
        // variant: '3d'
    }
}).draw();

A stacked Rose chart

var rose = new RGraph.Rose({
    id: 'cvs',
    data: [
        [2,6], [2,4], [1,5], [4,3], [7,5],
        [8,3], [4,5], [3,4], [2,6], [4,5]
    ],
    options: {
        variant: 'stacked'
        // variant: 'stacked3d'
    }
}).draw();

A non-equi-angular Rose chart

var rose = new RGraph.Rose({
    id: 'cvs',
    data: [
        [45,23], [45,23], [5,26],  [78,4],  [49,12],
        [49,21], [40,18], [48,12], [43,23], [45,12]
    ],
    options: {
        variant: 'non-equi-angular'
        //variant: 'non-equi-angular3d'
    }
}).draw();

It is important to note that with a non-equi-angular each "value" is actually an array consisting of two values, as shown. The first value represents the magnitude of the segment (ie how far the segment extends outwards), and the second value represents the size of the segment. The second value is relative to all the other second values - it is not the absolute angle used. The angle is calculated for you.

.
Default: stacked
Name: variantThreedDepth
Description: 
This is the depth/thickness of the Rose chart when in 3D mode. Using larger depths can make the labels be drawn over the labels.
Default: 10
Name: exploded
Description: 
This stipulates the exploded value for a segment. It can either be a number that is applied to all segments, or an array of separate values (eg [15,0,20,25]). The values are the distance from the center that the segment is.
Default:  0
Name: clearto
Description: 
This is used in animations and effects as the default color to use when clearing the canvas.
Default: null
Name: segmentHighlight
Description: 
If you wish you can have segments of the chart highlight as you move the mouse around.
Default: false
Name: segmentHighlightCount
Description: 
The number of segments by default corresponds to the number of "radials" that the background grid has but using this property you can set it explicitly.
Default: null
Name: segmentHighlightFill
Description: 
The fill color of the highlight.
Default: rgba(0,255,0,0.5)
Name: segmentHighlightStroke
Description: 
The stroke color of the highlight.
Default: rgba(0,0,0,0)
Name: responsive
Description: 
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)
An accessor that you can use to retrieve the values of properties.

obj.set(name, value)
An accessor that you can use to set the values of properties.

obj.getShape(event)
This method makes it easy to get hold of which segment has been clicked on or hovered over. It returns an object which has the following indexes available:
object The chart object
x This is the center X coordinate for the segment.
y This is the center Y coordinate for the segment.
radiusStart This is the start radius of the segment. Because you can have stacked segments in a Rose chart this is necessary.
radiusEnd This is the end radius of the segment.
angleStart This is the start angle of the segment. It's measured in radians - not degrees. 1 radian = 57.29 degrees.
angleEnd This is the end angle of the segment. It's measured in radians - not degrees. 1 radian = 57.29 degrees.
dataset This is the group that the segment or part-segment belongs to. In a regular Rose chart, each segment has a distinct group number. On a stacked Rose chart, this identifies each stack of part-segments. In a non-equi-angular chart, this is always zero.
index The zero-indexed index of the segment on the chart. In a stacked Rose chart this is the index in a particular stack, whereas in a regular Rose chart this is the index of the segment in the whole dataset. Likewise for a non-equi-angular dataset.
sequentialIndex This is the zero-indexed sequential index of the segment on the chart. No matter what the type of Rose chart that you're showing this just starts at zero and counts up for each segment.
tooltip If a tooltip is associated with this segment this will be it. id: strings are expanded for you (where the tooltip text is retrieved from the html tag with the matching ID).
<script>
    rose.canvas.onclick = function (e)
    {
        RGraph.redraw();
    
        var canvas  = e.target,
            obj     = canvas.__object__,
            shape   = obj.getShape(e);

        if (shape) {
            
            var x           = shape.x,
                y           = shape.y,
                radiusStart = shape.radiusStart,
                radiusEnd   = shape.radiusEnd,
                angleStart  = shape.angleStart,
                angleEnd    = shape.angleEnd;

            // Path the outer edge of the segment
            obj.path(
                'b lw 3 a % % % % % false',
                x, y, radiusEnd, angleStart, angleEnd
            );

            // Path the inner edge of the segment - but going anti-clockwise!
            obj.path(
                'a % % % % % true c s black f red',
                x, y, radiusStart, angleEnd, angleStart
            );
        }
    }
</script>

obj.getRadius(value)

This method can be used to get the relevant radius for a given scale value.


obj.on(event, function)

This method can be used to set an event listener on an object. It operates similarly to the jquery on function. The first argument is the event that you wish to attach to and the second is the handler function. For example:

.on('draw', function (obj)
{
    // Put your event code here
});

The function is useful if you use method chaining when creating your charts:

var obj = new RGraph.Rose({
    id: 'cvs',
    data: [4,8,6,3,5,8,4,6],
    options: {
    }
}).on('draw', function (obj)
{
    // Put your draw event code here

}).on('click', function (e, shape)
{
    // Put your click event code here
}).draw();

obj.exec(function)

The exec function is documented 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.

Stacked Rose charts

Rose charts can now be stacked, much like stacked Bar charts. For examples of them, see the Rose chart example pages in the download archive. The data for a stacked Rose chart should be supplied in the same format as a stacked Bar chart:

<script>
    new RGraph.Rose({
        id: 'cvs',
        data: [[4,6,2],[8,4,7],[4,3,6],[1,5,6]],
        options: {
        }
    }).draw();
</script>

Non-equi-angular Rose charts

Rose charts can be displayed in a non-equi-angular mode. For an example see this Rose chart demo page in the download archive: rose-non-equi-angular.html. Instead of a plain array of values (as with a regular Rose chart), each data point should itself be a two element array consisting of the magnitude value and also a relative circular size. This second value is not the size of the angle - this is calculated. For example:

<script>
    new RGraph.Rose({
        id: 'cvs',
        data: [[47,6],[48,2],[40,4],[43,5],[45,6]],
        options: {
            variant: 'non-equi-angular'
        }
    }).draw();
</script>

Events

RGraph supports custom events that allow you to easily add interactivity to your charts if required. The following events are available:

For example:
new RGraph.Rose({
    id: 'cvs',
    data: [4,8,6,3,5,8,9],
    options: {
    }
}).on('draw', function (obj)
{
    console.log('The draw event has fired');
    
}).draw();

Effects

These effects are available and can be used instead of the draw function. There are also generic effects available which you can see here: Generic effects and transitions
<script>
    // Optional callback function that's called when the effect is complete
    function myCallback (obj)
    {
        // ...
    }

    new RGraph.Rose({
        id: 'cvs',
        data: [8,6,3,5,2,4,8],
        options: {
            marginLeft: 35
        }
    }).grow({frames: 60}, myCallback)
    // .roundRobin({frames: 60}, myCallback)
    // .implode({frames: 60}, myCallback)
    // .explode({frames: 60}, myCallback)
</script>