113 lines
3.0 KiB
JavaScript
113 lines
3.0 KiB
JavaScript
const EXPLOSION_TIME = 100;
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const EXPLOSION_SIZE = 100;
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const NUM_PARTICLES = 12;
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const SPEED = 2;
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let OVERRIDE_ROCKETS = false;
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function HSVtoRGB(h, s, v) {
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var r, g, b, i, f, p, q, t;
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if (arguments.length === 1) {
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s = h.s, v = h.v, h = h.h;
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}
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i = Math.floor(h * 6);
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f = h * 6 - i;
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p = v * (1 - s);
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q = v * (1 - f * s);
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t = v * (1 - (1 - f) * s);
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switch (i % 6) {
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case 0: r = v, g = t, b = p; break;
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case 1: r = q, g = v, b = p; break;
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case 2: r = p, g = v, b = t; break;
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case 3: r = p, g = q, b = v; break;
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case 4: r = t, g = p, b = v; break;
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case 5: r = v, g = p, b = q; break;
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}
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return "rgb(" + (r * 255) + "," + (g * 255) + "," + (b * 255) + ")";
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}
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const canvas = document.getElementById("fireworks-canvas");
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const updateSize = () => {
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canvas.width = window.innerWidth;
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canvas.height = window.innerHeight;
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};
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let rockets = [];
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let rocketsAreFiring = false;
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updateSize();
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window.onresize = updateSize;
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const ctx = canvas.getContext("2d");
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window.addEventListener("keyup", e => {
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if (e.key == 'h') {
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canvas.style.display = canvas.style.display == 'none' ? null : 'none';
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}
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});
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setInterval(() => {
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const theTime = new Date();
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if (!OVERRIDE_ROCKETS && (theTime.getDate() != 1 || theTime.getMonth() != 0 || theTime.getHours() != 0)) {
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rockets = [];
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rocketsAreFiring = false;
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return;
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}
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rocketsAreFiring = true;
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rockets.push({ x: Math.random() * canvas.width, y: canvas.height, life: (Math.random() * 0.75 + 0.25) * canvas.height, color: HSVtoRGB(Math.random(), 1, 1) });
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}, 300);
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setInterval(() => {
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if (!rocketsAreFiring) {
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ctx.clearRect(0, 0, canvas.width, canvas.height);
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return;
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}
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ctx.fillStyle = "#000044ff";
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ctx.fillRect(0, 0, canvas.width, canvas.height);
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rockets.forEach(rocket => {
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rocket.life -= SPEED;
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if (rocket.life <= EXPLOSION_TIME) {
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if (rocket.life <= 0) {
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rockets.splice(rockets.indexOf(rocket), 1);
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return;
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}
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const explosionTime = 1 - (rocket.life / EXPLOSION_TIME);
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const size = explosionTime * EXPLOSION_SIZE;
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for (let i = 0; i < NUM_PARTICLES; i++) {
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const angle = i / NUM_PARTICLES * Math.PI * 2;
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const px = Math.cos(angle) * size;
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const py = Math.sin(angle) * size;
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ctx.fillStyle = rocket.color;
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ctx.beginPath();
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ctx.arc(rocket.x + px, rocket.y + py, 5, 0, Math.PI * 2, true);
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ctx.fill();
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}
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} else {
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rocket.y -= SPEED;
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ctx.fillStyle = "black";
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ctx.fillRect(rocket.x - 5, rocket.y - 5, 10, 10);
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}
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});
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const theTime = new Date();
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ctx.fillStyle = "white";
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ctx.textAlign = "center";
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ctx.font = "bold 50px Comic Mono";
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ctx.fillText("Happy new year! 🥳", canvas.width / 2, canvas.height / 2);
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ctx.font = "bold 100px Comic Mono";
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ctx.fillText(theTime.getHours().toString().padStart(2, '0') + ":" + theTime.getMinutes().toString().padStart(2, '0') + ":" + theTime.getSeconds().toString().padStart(2, '0'), canvas.width / 2, canvas.height / 2 - 150);
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ctx.font = "bold 10px Comic Mono";
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ctx.fillStyle = "#0000ff";
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ctx.textAlign = "left";
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ctx.fillText("Press 'h' to hide", 10, canvas.height - 10);
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}, 10);
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