Odometer chart API reference

Documentation about the Odometer chart including information about all of the options that are available to you. The Odometer chart is a meter type of chart and can be used to display a single value or quantity.

• Example
• Properties
• Methods
• Events
• Effects

Example

<script>
    new RGraph.Odometer({
        id: 'cvs',
        min: 0,
        max: 100,
        value: 18,
        options: {
            colorsGreenMax: 75,
            colorsRedMin: 90,
            labelsAreaWidth: 50,
            needleThickness: 2
        }
    }).draw();
</script>

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 is shown above.

• Chart configuration properties
• Margin properties
• Color properties
• Scale properties
• Labels and text properties
• Needle properties
• Title properties
• Shadow properties
• Interactive features properties
• Miscellaneous properties

Chart configuration properties

Margin properties

Color properties

Scale properties

Labels and text properties

<div style="margin-left: 50px; display: inline-block">
    <canvas id="cvs" width="650" height="250"></canvas>
</div>

<div style="margin-left: 50px; display: inline-block">
    <canvas id="cvs" width="650" height="250"></canvas>
</div>

Needle properties

obj.set('needleExtra', [[16, 'red'], [24, 'blue']]);

obj.set('needleExtra', [[16, 'red'], [24, 'blue']]);

Title properties

Shadow properties

Interactive features properties

Miscellaneous properties

Methods

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

obj.getAngle(value)
This method will return you an appropriate angle for the given value.

obj.on(event, function)

This method can be used to set an event listener on an object. It operates in a similar way 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 event code here
});

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

var obj = new RGraph.Odometer({
    id: 'cvs',
    min: 0,
    max: 100,
    value: 56
}).on('draw', function (e, shape)
{
    // Put draw event code here
})
.on('click', function (e, shape)
{
    // Handle click event
}).draw();

The exec() function is documented here.

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.

The responsive() function is documented on its own page here.

Events

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

• adjustbegin This event fires at the start of adjusting - like the standard mousedown event.
• adjust This event fires (repeatedly) during adjusting - like the standard mousemove event.
• adjustend This event fires at the end of adjusting - like the standard mouseup event.
• annotatebegin This event fires at the start of annotating - like the standard mousedown event.
• annotate This event fires (repeatedly) during annotating - like the standard mousemove event.
• annotateend This event fires at the end of annotating - like the standard mouseup event.
• annotateclear This event fires at the end of the RGraph.clearAnnotations() function.
• beforeclear This event fires at the start of the RGraph.clear() function.
• clear This event fires at the end of the RGraph.clear() function.
• beforecontextmenu This event fires when you have the contextmenu enabled and it is about to appear.
• contextmenu This event fires when you have the contextmenu enabled and it has been displayed.
• beforedraw This event fires at the start of the draw() method before anything has been done.
• firstdraw This event fires at the end of the draw() function - but only the first time that the draw() function is called.
• draw This event fires at the end of the draw() function.

new RGraph.Odometer({
    id: 'cvs',
    min: 0,
    max: 100,
    value: 47,
    options: {
    }
}).on('draw', function (obj)
{
    console.log('The draw event has fired');
    
}).draw();

Effects

• The grow effect (effects-odo-grow.html in the download archive)

<script>
    window.onload = (function ()
    {
        /**
        * Optional callback function that's called when the effect is complete
        */
        function myCallback (obj)
        {
            // ...
        }
    
        new RGraph.Odometer({
            id: 'cvs',
            min: 0,
            max: 100,
            value: 56,
            options: {
                marginLeft: 35
            }
        }).grow({frames: 60}, myCallback);
    });
</script>