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# RGraph: HTML5 canvas graph library - Traditional radar chart documentation

A traditional radar chart.

The example file is here.

    <script>
        window.onload = function ()
        {
            var data = [3, 3, 41, 37, 16];

            var tradar = new RGraph.Tradar('myTradar', data);
            tradar.Set('chart.background.circles', true);
            tradar.Set('chart.color', 'rgba(255,0,0,0.5)');
            tradar.Set('chart.circle', 20);
            tradar.Set('chart.circle.fill', 'rgba(200,255,200,0.5)');
            tradar.Set('chart.labels', ['Safari (3%)', 'Other (3%)', 'MSIE 7 (41%)', 'MSIE 6 (37%)', 'Firefox (16%)']);
            tradar.Set('chart.key', ['Market share', 'A made up figure']);
            tradar.Draw();
        }
    </script>

## Properties

You can use these properties to control how the chart apears. You can set these properties by using the Set() method. Eg:

myTradar.Set('color', 'rgba(255,0,0,0.5)');

- Margins
- Colors
- Title
- Labels and text
- Scale
- Miscellaneous
- Key
- Interactive features
- Zoom

### Margins

chart.gutter
The gutter that the chart uses. This is effectively the margin.
Default: 25

### Colors

chart.color
The color of the radar chart.
Default: rgba(255,0,0,0.5)

### Title

chart.title
The title, if any, of the chart.
Default: Not set
chart.title.color
The color of the title.
Default: black
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
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

### Labels and text

chart.labels
The labels to use for the chart.
Default: An empty array
chart.labels.axes
This controls the axes that show the scale labels. Each letter stands for the appropriate axis (North, South, East and West)
Default: nsew
chart.labels.offsetx
The X pixel offset for the labels.
Default: 10
chart.labels.offsety
The Y pixel offset for the labels.
Default: 10
chart.text.font
The font used to render the text.
Default: Verdana
chart.text.color
The color of the labels.
Default: black
chart.text.size
The size of the text (in points).
Default: 10

### Scale

chart.ymax
The optional maximum Y scale value. If not specified then it will be calculated.
Default: null (It's calculated)
chart.scale.round
Whether to round the maximum scale value up or not. This will produce slightly better scales in some instances.
Default: null

### Miscellaneous

chart.background.circles
Whether to draw the grey background circles.
Default: true
chart.linewidth
The width of the outline.
Default: 1
chart.circle
What value to draw a circle at. Defaults to zero (off). You could use this to represent a threshold of some sort.
Default: 0
chart.circle.fill
What color to fill the circle with.
Default: red
chart.circle.stroke
What color to stroke (ie The outline) the circle with.
Default: black

### Key

chart.key
An array of two descriptions. The actual radar, and the indicated limit circle.
Default: Not set
chart.key.shadow
Whether a small drop shadow is applied to the key.
Default: false
chart.key.shadow.color
The color of the shadow.
Default: #666
chart.key.shadow.blur
The extent of the blurring effect used on the shadow.
Default: 3
chart.key.shadow.offsetx
The X offset of the shadow.
Default: 2
chart.key.shadow.offsety
The Y offset of the shadow.
Default: 2
chart.key.position
Determines the position of the key.Either graph (default), or gutter.
Default: graph
chart.key.background
The background color of the key. If the key covers too much, you can use a semi-transparent colour - eg. rgba(255,255,255,0.7).
Default: #fff
chart.key.rounded
This controls whether the corners of the key (in graph mode) are curved. If the key is gutter mode, this has no effect.
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.tooltips
A numerically indexed array of tooltips that are shown when a hotspot is hovered over. These can contain HTML.
Default: An empty array
chart.tooltips.effect
The visual effect used when showing tooltips. Can be either fade or expand.
Default: fade
chart.tooltips.css.class
This is the name of the CSS class the graph uses.
Default: RGraph_tooltip
chart.tooltips.override
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
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