153 lines
3.7 KiB
JavaScript
153 lines
3.7 KiB
JavaScript
const numberOfParticules = 20;
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const minOrbitRadius = 50;
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const maxOrbitRadius = 100;
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const minCircleRadius = 10;
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const maxCircleRadius = 20;
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const minAnimeDuration = 900;
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const maxAnimeDuration = 1500;
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const minDiffuseRadius = 50;
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const maxDiffuseRadius = 100;
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let canvasEl = document.querySelector(".fireworks");
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let ctx = canvasEl.getContext("2d");
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let pointerX = 0;
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let pointerY = 0;
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let tap =
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"ontouchstart" in window || navigator.msMaxTouchPoints
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? "touchstart"
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: "mousedown";
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// sea blue
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let colors = ["127, 180, 226", "157, 209, 243", "204, 229, 255"];
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function setCanvasSize() {
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canvasEl.width = window.innerWidth;
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canvasEl.height = window.innerHeight;
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canvasEl.style.width = window.innerWidth + "px";
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canvasEl.style.height = window.innerHeight + "px";
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}
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function updateCoords(e) {
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pointerX = e.clientX || e.touches[0].clientX;
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pointerY = e.clientY || e.touches[0].clientY;
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}
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function setParticuleDirection(p) {
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let angle = (anime.random(0, 360) * Math.PI) / 180;
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let value = anime.random(minDiffuseRadius, maxDiffuseRadius);
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let radius = [-1, 1][anime.random(0, 1)] * value;
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return {
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x: p.x + radius * Math.cos(angle),
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y: p.y + radius * Math.sin(angle)
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};
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}
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function createParticule(x, y) {
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let p = {};
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p.x = x;
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p.y = y;
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p.color =
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"rgba(" +
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colors[anime.random(0, colors.length - 1)] +
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"," +
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anime.random(0.2, 0.8) +
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")";
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p.radius = anime.random(minCircleRadius, maxCircleRadius);
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p.endPos = setParticuleDirection(p);
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p.draw = function () {
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ctx.beginPath();
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ctx.arc(p.x, p.y, p.radius, 0, 2 * Math.PI, true);
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ctx.fillStyle = p.color;
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ctx.fill();
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};
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return p;
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}
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function createCircle(x, y) {
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let p = {};
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p.x = x;
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p.y = y;
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p.color = "#000";
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p.radius = 0.1;
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p.alpha = 0.5;
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p.lineWidth = 6;
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p.draw = function () {
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ctx.globalAlpha = p.alpha;
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ctx.beginPath();
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ctx.arc(p.x, p.y, p.radius, 0, 2 * Math.PI, true);
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ctx.lineWidth = p.lineWidth;
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ctx.strokeStyle = p.color;
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ctx.stroke();
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ctx.globalAlpha = 1;
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};
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return p;
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}
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function renderParticule(anim) {
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for (let i = 0; i < anim.animatables.length; i++) {
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anim.animatables[i].target.draw();
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}
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}
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function animateParticules(x, y) {
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let circle = createCircle(x, y);
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let particules = [];
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for (let i = 0; i < numberOfParticules; i++) {
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particules.push(createParticule(x, y));
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}
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anime
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.timeline()
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.add({
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targets: particules,
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x: function (p) {
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return p.endPos.x;
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},
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y: function (p) {
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return p.endPos.y;
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},
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radius: 0.1,
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duration: anime.random(minAnimeDuration, maxAnimeDuration),
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easing: "easeOutExpo",
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update: renderParticule
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})
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.add({
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targets: circle,
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radius: anime.random(minOrbitRadius, maxOrbitRadius),
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lineWidth: 0,
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alpha: {
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value: 0,
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easing: "linear",
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duration: anime.random(600, 800)
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},
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duration: anime.random(1200, 1800),
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easing: "easeOutExpo",
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update: renderParticule,
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offset: 0
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});
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}
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let render = anime({
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duration: Infinity,
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update: function () {
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ctx.clearRect(0, 0, canvasEl.width, canvasEl.height);
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}
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});
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document.addEventListener(
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tap,
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function (e) {
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render.play();
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updateCoords(e);
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animateParticules(pointerX, pointerY);
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},
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false
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);
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setCanvasSize();
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window.addEventListener("resize", setCanvasSize, false);
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