hue-animate

hue-animate lets you start a Hue Entertainment API sync session and control lights using an API similar to the requestAnimationFrame() API in the browser.

Why did I build this?

This came out from a separate not-(yet)-public side-project where I am syncing Hue lights to currently playing Spotify music. I needed a way to have total control over the lights properties in each frame, and the result was something that looked quite alike the requestAnimationFrame in the browser.

---

Getting started

Install from npm:

npm install hue-animate

Usage Example:

import HueAnimate from 'hue-animate'

// Configuration needed to connect to the Hue Bridge and start an Entertainment API session
// Refer to Hue API docs for more details
const hueConfig: HueStreamConfig = {
    bridge: {
        ipAddress: '',
        username: '',
        clientKey: ''
    },
    target: {
        groupId: 0
    }
};

// Instantiate HueAnimate
const hueAnimate = new HueAnimate({
    hueConfig,
    options: {
        refreshRate: 20,
        debug: false,
    }
})

// Define your "render" function
const myRenderFn = ({lights, now}) => {
    lights.forEach((light) => {
        light.brightness = 1;
    });
    hueAnimate.requestAnimationFrame(myRenderFn)
}

// Start a sync session
hueAnimate.start().then(() => {
    hueAnimate.requestAnimationFrame(myRenderFn)
});

requestAnimationFrame()

This method behaves similarly to how the browsers method of the same name behaves. Whenever you call requestAnimationFrame(yourCallbackFunction), your function will be placed in the queue.

Then, when the time comes to "render" the scene, and by rendering we mean streaming the new state of lights to the Hue Bridge, all the callback methods in the queue will be called with two arguments: lights: Light[] and now: number.

lights: Light[] is an array of all the lights in entertainment group that we are streaming to. Each Light has an id and hueId which can help you to identify particular lights. Each Light also has brightness: number and color: { r: number; g: number; b: number; }; properties. These two are what you will primarily be modifying in order to create animations.

now is the timestamp for the currently rendering frame.

The callbacks in the queue will be executed in the order they were added. Every callback will be called with the same now value, but the values inside lights will be modified by previously called callbacks. This enables you to, for example, have two different callbacks, one handling color changes and the other handling brightness changes.

License

MIT