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| import * as TWEEN from "@tweenjs/tween.js";
import Two from "two.js";
import animations, { register } from "./index";
import { two, center } from "../common";
import { Circle } from "two.js/src/shapes/circle";
let direction = true;
let animate_ins = [],
animate_outs = [];
const TWO_PI = Math.PI * 2;
const duration = 1000;
const amount = 24;
const last = amount - 1;
const circles = [...Array(amount).keys()].map((i) => {
const circle: Circle & {
theta?: number;
destination?: number;
} = new Two.Circle();
circle.theta = 0;
circle.destination = 0;
return circle;
});
const group = two.makeGroup(circles);
group.noStroke().fill = "#e34f0c";
function start() {
animate_ins[0].start();
}
function resize() {
group.translation.copy(center);
}
function reset() {
if (animate_ins.length > 0) {
animate_ins.forEach(stop);
animate_ins.length = 0;
}
if (animate_outs.length > 0) {
animate_outs.forEach(stop);
animate_outs.length = 0;
}
direction = Math.random() > 0.5;
group.rotation = Math.random() * TWO_PI;
const radius = animations.minDimension / 3;
const bubbleRadius = animations.minDimension / 90;
for (let i = 0; i < circles.length; i++) {
let pct = i / amount;
let npt = (i + 1) / amount;
const circle = circles[i];
circle.visible = false;
circle.radius = bubbleRadius;
circle.destination = TWO_PI * pct;
circle.theta = 0;
circle.translation.set(radius, 0);
const ain = new TWEEN.Tween(circle)
.to({ theta: circle.destination }, (0.2 * duration) / (i + 1))
.onStart(() => (circle.visible = true))
.onUpdate(() => {
const theta = circle.theta * (direction ? 1 : -1);
const x = radius * Math.cos(theta);
const y = radius * Math.sin(theta);
circle.translation.set(x, y);
})
.onComplete(() => {
if (i >= last) {
animate_outs[0].start();
return;
}
const next = circles[i + 1];
const tween = animate_ins[i + 1];
next.theta = circle.theta;
next.translation.copy(circle.translation);
tween.start();
});
animate_ins.push(ain);
const destination = Math.min(npt * TWO_PI, TWO_PI);
const aout = new TWEEN.Tween(circle)
.to(
{
theta: destination,
},
(0.2 * duration) / (amount - (i + 1))
)
.onUpdate(() => {
const theta = circle.theta * (direction ? 1 : -1);
const x = radius * Math.cos(theta);
const y = radius * Math.sin(theta);
circle.translation.set(x, y);
})
.onComplete(() => {
circle.visible = false;
if (i >= last - 1) {
reset();
} else {
animate_outs[i + 1].start();
}
});
animate_outs.push(aout);
}
}
function stop(tween) {
tween.stop();
}
resize();
reset();
const animation = {
start: start,
clear: reset,
resize: resize,
name: "bubbles",
};
register(animation.name, animation);
|
