scene

v1.3.0

Published

2 years ago

Scene is a simple but powerful property interpolation class for creating (CSS) animation and parallax effects.

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codecab

moudy

Scene - Property interpolation with ease

Scene is a simple but powerful property interpolation class for creating (CSS) animation and parallax effects.

Scene calls a callback for every element when a property has changed so you only have to implement the property values

Setup

npm install scene

import Scene from 'scene';

Demo

See https://github.com/code-cab/scene/tree/master/demo

Demo screenshot

Basic parallax example

import Scene from 'scene';

const scene = new Scene(0, 1000);

scene.addItem('someObj', props => {
    myObj.x = props.x;
    myObj.y = props.y;
    myObj.scale.x = myObj.scale.y = props.scale;
});
scene.step('someObj', 0, {x: 0, y: 0, scale: 1});
scene.step('someObj', 200, {x: 100, y: 200});
scene.step('someObj', 400, {x: -200, y: 100}, {timing: 'ease'});

window.addEventListener('scroll', () => scene.animate(window.offsetY));

When the target object can be controlled single level properties you can also use the target directly:

scene.addItem(myObj);
scene.addItem(myOtherObj);
scene.step(myObj, 30, {x: 100, y: 200}); // This will call myObj.x and myObj.y
scene.step(myOtherObj, 30, {x: 100, y: 500});

Basic HTML element transition

<html>
    <style> #myElem { position: absolute; display: inline-block; } </style>
    <span id="myElem">Hello world</span>
</html>

import Scene from 'scene';

const period = 5000;
const scene = new Scene(0, period);
const myElem = document.getElementById('myElem');

scene.addItem(myElem);
scene.step(myElem, 0 * period, {x: 0, y: 0, rotate: 0, scale: 1});
scene.step(myElem, 0.5 * period, {x: 100, y: 100, rotate: 180, scale: 2});
scene.step(myElem, 1 * period, {x: 0, y: 0, rotate: 360, scale: 1});

function animate() {
    scene.animate(performance.now() % period);
    requestAnimationFrame(animate);
}
animate();

API

new Scene(startValue, endValue)

Create a new Scene with a range from startValue till endValue.

startValue number
endValue number

scene.addItem(idOrTarget [, callback])

Add an item to the scene. Items can be added while dynamically while running.

idOrTarget Can be a string identifier or an object. When the object is an instance of HTMLElement and no callback is provided Scene will use HTMLElement style.transform property for translation, scaling and rotation.
When idOrTarget is an object and no callback is provided, the properties are called from that object.
callback Optional callback function with parameters:
- props Object with new property values. The values are iterated between according to the phase, the start and end values from that property and the timing function.
  Please note that the callback is only called when values have changed.
- stepPhases Object with the phases (range 0..1) of each property. Phase can be out of the 0..1 range as a result of the chosen timing function.
- sceneValue Current value of the scene
- idOrTarget ID or Target of the target item

scene.step(idOrTarget, at, props [, opts])

Timing

Scene supports the following 'tween' timings:

ease, easein, easeout:

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