63 lines
1.6 KiB
JavaScript
63 lines
1.6 KiB
JavaScript
import anime from "https://esm.sh/animejs@3.2.2";
|
|
|
|
const second = 1000;
|
|
|
|
function gaussianRandom(mean=0, stdev=1) {
|
|
const u = 1 - Math.random(); // Converting [0,1) to (0,1]
|
|
const v = Math.random();
|
|
const z = Math.sqrt( -2.0 * Math.log( u ) ) * Math.cos( 2.0 * Math.PI * v );
|
|
// Transform to the desired mean and standard deviation:
|
|
return z * stdev + mean;
|
|
}
|
|
|
|
|
|
function* brownian(n){
|
|
let x = 0;
|
|
for(let i = 0; i < n; i ++){
|
|
x += gaussianRandom(0, 10);
|
|
console.log(x);
|
|
yield x;
|
|
}
|
|
}
|
|
|
|
function* pseudoBrownian(n, limit){
|
|
let x = 0;
|
|
for(let i = 0; i < n; i ++){
|
|
let delta = gaussianRandom(0, 10);
|
|
if(Math.abs(x + delta) > limit){
|
|
delta = -1 * delta
|
|
}
|
|
x += delta;
|
|
yield x;
|
|
}
|
|
}
|
|
|
|
function* keyFrames(duration, framePerSeconds){
|
|
const deltaX = 1000 / (duration * framePerSeconds);
|
|
for(const deltaY of pseudoBrownian(duration * framePerSeconds, 100)){
|
|
yield {translateX: `+=${deltaX}`, translateY: deltaY};
|
|
}
|
|
}
|
|
|
|
const duration = 60;
|
|
const timeline = anime.timeline({
|
|
duration: duration * second,
|
|
autoplay: false,
|
|
easing: 'linear'});
|
|
|
|
for(let i = 1; i <= 12; i++){
|
|
timeline.add({
|
|
targets: `#rect-${i}`,
|
|
keyframes: Array.from(keyFrames(duration, 30)),
|
|
}, 0)
|
|
}
|
|
|
|
|
|
document.querySelector('#play').onclick = timeline.play;
|
|
document.querySelector('#pause').onclick = timeline.pause;
|
|
document.querySelector('#seek').onclick = function(){
|
|
const seekVal = Number.parseFloat(second * document.querySelector('#seek-value').value);
|
|
timeline.pause();
|
|
timeline.seek(seekVal);
|
|
}
|