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# RGraph: HTML5 canvas graph library - Odometer documentation

The example file is here.

    <script>
        window.onload = function ()
        {
            // ID, MINIMUM, MAXIMUM, INDICATED VALUE
            var odo = new RGraph.Odometer('myOdo', 0, 100, 18);

            odo.Set('chart.green.max', 75);
            odo.Set('chart.red.min', 90);
            odo.Set('chart.label.area', 50);
            odo.Set('chart.needle.thickness', 2);

            odo.Draw();
        }
    </script>

## Properties

You can use these properties to control how the bar graph apears. You can set these properties using the Set() method.

- Chart configuration
- Margins
- Colors
- Labels and text
- Needle
- Title
- Shadow
- Interactive features
- Zoom
- Scale

### Chart configuration

chart.value.text
Controls whether the value is indicated as a text label in the center of the dial.
Default: false
chart.value.units.pre
The pre units used on the textual value.
Default: nothing (An empty string)
chart.value.units.post
The post units used on the textual value.
Default: nothing (An empty string)
chart.border
This controls the gray border of the Odometer.
Default: false
chart.tickmarks.highlighted
This controls whether the tickmarks are highlighted in red/yellow/green.
Default: false
chart.zerostart
If you want the top value on your chart to be zero instead of the maximum value, set this to true.
Default: false

### Margins

chart.gutter
The width of the area outside the odometer.
Default: 25

### Colors

chart.green.max
This is the point at which the green area ends.
Default: 75% of the maximum value
chart.red.min
This is the point at which the red area starts. The yellow area is between the green and red areas.
Default: 90% of the maximum value

### Labels and text

chart.labels
Instead of using computed numbers, which uses the maximum value, you can specify the Odometer to use textual labels instead, with this option.
Default: null
chart.label.area
The width of the area that labels are put in.
Default: 35
chart.text.size
The size of the text (in points).
Default: 10
chart.text.font
The font used to render the text.
Default: Verdana
chart.text.color
The color of the labels.
Default: black

### Needle

chart.needle.width
How thick the needle is.
Default: 2
chart.needle.color
The color that is applied to the needle.
Default: black
chart.needle.head
This controls whether the arrow head on the end of the needle is displayed.
Default: true
chart.needle.type
This determines which type of needle is used. It can be pointer or triangle.
Default: pointer
chart.needle.extra
With this you can specify a number of extra pointers that will be drawn on the Odometer. An example would be a meter that's used to show upload and download data. An example use:

    odo.Set('chart.needle.extra', [[16, 'red'], [24, 'blue']]);

Default: [] (An empty array)

### Title

chart.title
The title text.
Default: no title set
chart.title.color
The color of the title.
Default: black
chart.title.hpos
This allows you to completely override the horizontal positioning of the title. It should be a number between 0 and 1, and is multiplied with the whole width of the canvas and then used as the horizontal position.
Default: null
chart.title.vpos
This allows you to completely override the vertical positioning of the title. It should be a number between 0 and 1, and is multiplied with the gutter and then used as the vertical position. It can be useful if you need to have a large gutter.
Default: null

### Shadow

chart.shadow.inner
Whether a drop shadow is applied to the inner circle of the Odometer
Default: false
chart.shadow.outer
Whether a drop shadow is applied to the whole Odometer.
Default: false

### Interactive features

chart.contextmenu
An array of context menu items. More information on context menus is here.
Default: [] (An empty array)
chart.annotatable
Whether annotations are enabled for the chart (ie you can draw on the chart interactively.
Default: false
chart.annotate.color
If you do not allow the use of the palette, then this will be the only colour allowed for annotations.
Default: black
chart.resizable
Defaulting to false, this determines whether your graph will be resizable. Because of the numerous event handlers this has to install code on, This feature is unlikely to work with other dynamic features (the context menu is fine however).
Default: false

### Zoom

chart.zoom.mode
Can be used to control whether the zoom is in thumbnail or canvas mode. Possible values are: thumbnail and canvas.
Default: canvas
chart.zoom.factor
This is the factor that the graph will be zoomed by (bigger values means more zoom)
Default: 1.5
chart.zoom.fade.in
Whether the zoomed canvas fades in or not. This also can be used to control the fade in for the zoom in thumbnail mode.
Default: true
chart.zoom.fade.out
Whether the zoomed canvas fades out or not. This also can be used to control the fade in for the zoom in thumbnail mode.
Default: true
chart.zoom.hdir
The horizontal direction of the zoom. Possible values are: left, center, right
Default: right
chart.zoom.vdir
The vertical direction of the zoom. Possible values are: up, center, down
Default: down
chart.zoom.delay
The delay (in milliseconds) between frames.
Default: 50
chart.zoom.frames
The number of frames in the zoom animation.
Default: 10
chart.zoom.shadow
Whether or not the zoomed canvas has a shadow or not.
Default: true
chart.zoom.thumbnail.width
When the zoom is in thumbnail mode, this is the width (in pixels) of the thumbnail.
Default: 75
chart.zoom.thumbnail.height
When the zoom is in thumbnail mode, this is the height (in pixels) of the thumbnail.
Default: 75
chart.zoom.background
Defaulting to true, this determines whether the zoom has a dark, semi-opaque background that covers the entire web page.
Default: true

### Scale

chart.units.pre
The units that the value is measured in. This string is displayed BEFORE the actual value, allowing you to specify values such as "$50".
Default: none
chart.units.post
The units that the value is measured in. This string is displayed AFTER the actual value, allowing you to specify values such as "50ms".
Default: none
chart.scale.decimals
The number of decimal places to display for the labels.
Default: 0