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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)');
Chart configuration
chart.width
This controls the width of the graph. You can set this to (for example) 600 and have your canvas 650px wide giving an extra
50px for labels.
Default: null (By default the canvas width is used)
chart.height
This controls the height of the graph. You can set this to (for example) 250 and have your canvas 300px heigh giving an extra
50px for labels.
Default: null (By default the canvas height is used)
Margins
chart.gutter
The gutter that the chart uses. This is effectively the margin.
Default: 25
Colors
chart.colors
The colors of the radar chart(s).
Default: red
chart.colors.alpha
If set (a number between 0 nd 1), this will be used as the alpha value of the colors of the graph.
Default: null
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.highlight.stroke
If you use tooltips, this controls the color of the highlight stroke.
Default: gray
chart.highlight.fill
If you use tooltips, this controls the colour of the highlight fill.
Default: white
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 key information.
Default: [] (An empty array)
chart.key.background
The color of the key background. Typically white, you could set this to something like rgba(255,255,255,0.7) to allow people to see things behind it.
Default: white
chart.key.halign
Instead of specifying the exact x/y coordinates, you can use this property to simply specify whether the key hould be
aligned left or right.
Default: right
chart.key.position
Determines the position of the key.Either graph (default), or gutter.
Default: graph
chart.key.position.x
This allows you to specify a specific X coordinate for the key.
Default: null
chart.key.position.y
This allows you to specify a specific Y coordinate for the key.
Default: null
chart.key.position.gutter.boxed
If you have the key in gutter mode (ie horizontal), this allows you to give a background color.
Default: true
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.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
chart.key.color.shape
This can be square, circle or line and controls how the color indicators in the key appear.
Default: square
chart.key.linewidth
The line width of the surrounding border on the key.
Default: 1
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.coords.adjust
When you translate (to make the best use of space for example) this allows you to adjust the tooltip coordinates accordingly.
Default: [0,0]
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
chart.resize.handle.adjust
If you're right aligning your chart then you may need this to adjust the position of the resize handle.
Default: [0,0]
chart.resize.handle.background
With this you can specify the background color for the resize handle. If you're adjusting the position of the
handle then you may need this to make the handle stand out more.
Default: null
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
