shine.js
A library for pretty shadows.
See the working demo at http://bigspaceship.github.io/shine.js/.
Get Started 
Install using bower: bower install shine or download as zip or fork on GitHub.
Create a Shine.js instance for each DOM element you'd like to shine:
var shine = new Shine(document.getElementById('my-shine-object'));
Change the light position and make sure to redraw:
shine.light.position.x = window.innerWidth * 0.5;
shine.light.position.y = window.innerHeight * 0.5;
shine.draw(); // make sure to re-draw
Configuration
Each shine instance has a property pointing to an instance of shinejs.Config. One config can be shared amongst multiple shine instances.
When a config value changes, shine.draw() needs to be called to re-draw with the new settings.
Change the shadow of a shine instance:
shine.config.opacity = 0.1;
shine.config.blur = 0.2;
shine.draw(); // make sure to re-draw
Create a shared shinejs.Config instance:
// all parameters are optional and can be changed later
var config = new shinejs.Config({
numSteps: 4,
opacity: 0.2,
shadowRGB: new shinejs.Color(255, 0, 0)
});
// pass the config in the constructor
var shineA = new Shine(document.getElementById('my-shine-object-a'), config);
var shineB = new Shine(document.getElementById('my-shine-object-b'), config);
// or assign it to an instance later
var shineC = new Shine(document.getElementById('my-shine-object-c'));
shineC.config = config;
shineC.draw(); // make sure to re-draw
Shine API
Note: Shine is also mapped to shinejs.Shine. Use the long version if Shine is already defined.
Shine(domElement, optConfig, optClassPrefix, optShadowProperty)
The Shine constructor. Instantiate as new Shine(...) to create a new instance.
| Parameter | Type | Description |
|---|---|---|
| domElement | !HTMLElement |
The DOM element to apply the shine effect to. |
| optConfig | ?shinejs.Config= |
Optional config instance. If no instance is passed it a new instance with default values will be stored in the config property. |
| optClassPrefix | ?string= |
Optional class prefix that will be applied to all shine DOM elements. Defaults to shine-. |
| optShadowProperty | ?string= |
Optional property name that the shadow will be applied to. Overrides the automatic detection for use of either textShadow or boxShadow. The value will be applied as element.style[shadowProperty] = '...' and automatically prefixed for legacy browsers (e.g. MozBoxShadow). |
Shine.prototype.draw()
Draws all shadows based on the current light position. Call this method whenever a shine parameter is changed.
Shine.prototype.destroy()
Releases all resources and removes event listeners. Destroyed instance can't be reused and must be discarded.
Shine.prototype.updateContent(optText)
Re-initializes all shadows. Use this when you want to change the text or the domElement's contents have changed.
| Parameter | Type | Description |
|---|---|---|
| optText | ?string= |
If defined, will replace the DOM element's textContent. If omitted, the content will be read from the DOM element. |
Shine.prototype.enableAutoUpdates()
Adds DOM event listeners to automatically update all properties.
Shine.prototype.disableAutoUpdates()
Removes DOM event listeners to automatically update all properties.
Shine Properties
| Property | Type | Description |
|---|---|---|
| domElement | HTMLElement |
The DOM element to apply the shine effect to. |
| config | shinejs.Config |
Stores all config parameters. |
| light | shinejs.Light |
Stores the light position and intensity. |
shinejs.Config API
shinejs.Config(optSettings)
The shine config constructor. Pass an optional settings object from which to read values.
| Parameter | Type | Description |
|---|---|---|
| optSettings | ?Object= |
An optional object containing config parameters. |
shinejs.Config Properties
| Property | Type | Default | Description |
|---|---|---|---|
| numSteps | number |
8 |
The number of steps drawn in each shadow |
| opacity | number |
0.1 |
The opacity of each shadow (range: 0...1) |
| opacityPow | number |
1.2 |
The exponent applied to each step's opacity (1.0 = linear opacity). |
| offset | number |
0.15 |
Larger offsets create longer shadows |
| offsetPow | number |
1.8 |
The exponent applied to each step's offset (1.0 = linear offset). |
| blur | number |
40 |
The strength of the shadow blur. |
| blurPow | number |
1.4 |
The exponent applied to each step's blur (1.0 = linear blur). |
| shadowRGB | shinejs.Color |
new shinejs.Color(0, 0, 0) |
The shadow color in r, g, b (0...255) |
shinejs.Light API
shinejs.Light(optPosition)
The light constructor. Pass an optional position to apply by default.
| Parameter | Type | Description |
|---|---|---|
| optPosition | ?shinejs.Point= |
An position. Defaults to new shinejs.Point(0, 0). |
shinejs.Light Properties
| Property | Type | Default | Description |
|---|---|---|---|
| position | shinejs.Point |
new shinejs.Point(0, 0) |
The position of this light. |
| intensity | number |
1.0 |
The intensity of this light. Gets multiplied with shadow opacity. |
shinejs.Point API
shinejs.Point(x, y)
A 2D point class.
| Parameter | Type | Description |
|---|---|---|
| x | number= |
The x-coordinate. Defaults to 0. |
| y | number= |
The y-coordinate. Defaults to 0. |
shinejs.Point Properties
| Property | Type | Default | Description |
|---|---|---|---|
| x | number |
0 |
The x-coordinate. |
| y | number |
0 |
The y-coordinate. |
shinejs.Point.prototype.delta(p)
Returns a new instance of shinejs.Point with the x- and y-distance between this instance and the point p.
| Parameter | Type | Description |
|---|---|---|
| p | shinejs.Point |
The point to which to calculate the distance to. Distance will be expressed as this.x - p.x and this.y - p.y. |
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