Update index.html

index.html

@@ -436,7 +436,7 @@
 			var previousValue2;
 
 			function leapYear(year){
-  				return ((year % 4 == 0) && (year % 100 != 0)) || (year % 400 == 0);
+				return ((year % 4 == 0) && (year % 100 != 0)) || (year % 400 == 0);
 			}
 
 			const dayOfYear = date => Math.floor((date - new Date(date.getFullYear(), 0, 0)) / 1000 / 60 / 60 / 24);
@@ -455,10 +455,127 @@
 					}
 				}
 				previousValue2 = Math.floor((d.getMilliseconds() + 1000 * (d.getSeconds() % 2))/400);
-				document.getElementById("negclock").innerHTML = ((leapYear(d.getFullYear()) ? 365 : 364) - dayOfYear(d)).toString().padStart(3, '0') + "+" + (23 - d.getHours()).toString().padStart(2, '0') + ":" + (59 - d.getMinutes()).toString().padStart(2, '0') + ":" + (59 - d.getSeconds()).toString().padStart(2, '0') + "." + d.getMilliseconds().toString().padStart(3, '0');
+				document.getElementById("negclock").innerHTML = ((leapYear(d.getFullYear()) ? 366 : 365) - dayOfYear(d)).toString().padStart(3, '0') + "+" + (23 - d.getHours()).toString().padStart(2, '0') + ":" + (59 - d.getMinutes()).toString().padStart(2, '0') + ":" + (59 - d.getSeconds()).toString().padStart(2, '0') + "." + d.getMilliseconds().toString().padStart(3, '0');
 			}
 		</script>
 	</div>
+	<div id="fireworks" style="pointer-events: none; position: fixed; top: 0; left: 0; width: 100vw; height: 100vh;">
+		<canvas id="fireworks-canvas"></canvas>
+
+		<script>
+			const EXPLOSION_TIME = 100;
+			const EXPLOSION_SIZE = 100;
+			const NUM_PARTICLES = 12;
+			const SPEED = 2;
+
+			function HSVtoRGB(h, s, v) {
+				var r, g, b, i, f, p, q, t;
+				if (arguments.length === 1) {
+					s = h.s, v = h.v, h = h.h;
+				}
+				i = Math.floor(h * 6);
+				f = h * 6 - i;
+				p = v * (1 - s);
+				q = v * (1 - f * s);
+				t = v * (1 - (1 - f) * s);
+				switch (i % 6) {
+					case 0: r = v, g = t, b = p; break;
+					case 1: r = q, g = v, b = p; break;
+					case 2: r = p, g = v, b = t; break;
+					case 3: r = p, g = q, b = v; break;
+					case 4: r = t, g = p, b = v; break;
+					case 5: r = v, g = p, b = q; break;
+				}
+
+				return "rgb(" + (r * 255) + "," + (g * 255) + "," + (b * 255) + ")";
+			}
+
+			const canvas = document.getElementById("fireworks-canvas");
+			const updateSize = () => {
+				canvas.width = window.innerWidth;
+				canvas.height = window.innerHeight;
+			};
+
+			let rockets = [];
+			let rocketsAreFiring = false;
+
+			updateSize();
+			window.onresize = updateSize;
+
+			const ctx = canvas.getContext("2d");
+
+			window.addEventListener("keyup", e => {
+				if (e.key == 'h') {
+					canvas.style.display = canvas.style.display == 'none' ? null : 'none';
+				}
+			});
+
+			setInterval(() => {
+				const theTime = new Date();
+				if (theTime.getDate() != 1 || theTime.getMonth() != 0 || theTime.getHours() != 0) {
+					rockets = [];
+					rocketsAreFiring = false;
+					return;
+				}
+
+				rocketsAreFiring = true;
+				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) });
+			}, 300);
+
+			setInterval(() => {
+				if (!rocketsAreFiring) {
+					ctx.clearRect(0, 0, canvas.width, canvas.height);
+					return;
+				}
+
+				ctx.fillStyle = "#000044ff";
+				ctx.fillRect(0, 0, canvas.width, canvas.height);
+
+				rockets.forEach(rocket => {
+					rocket.life -= SPEED;
+
+					if (rocket.life <= EXPLOSION_TIME) {
+						if (rocket.life <= 0) {
+							rockets.splice(rockets.indexOf(rocket), 1);
+							return;
+						}
+
+						const explosionTime = 1 - (rocket.life / EXPLOSION_TIME);
+						const size = explosionTime * EXPLOSION_SIZE;
+
+						for (let i = 0; i < NUM_PARTICLES; i++) {
+							const angle = i / NUM_PARTICLES * Math.PI * 2;
+							const px = Math.cos(angle) * size;
+							const py = Math.sin(angle) * size;
+
+							ctx.fillStyle = rocket.color;
+							ctx.beginPath();
+							ctx.arc(rocket.x + px, rocket.y + py, 5, 0, Math.PI * 2, true);
+							ctx.fill();
+						}
+					} else {
+						rocket.y -= SPEED;
+						ctx.fillStyle = "black";
+						ctx.fillRect(rocket.x - 5, rocket.y - 5, 10, 10);
+					}
+
+				});
+
+				const theTime = new Date();
+				ctx.fillStyle = "white";
+				ctx.textAlign = "center";
+				ctx.font = "bold 50px Comic Mono";
+				ctx.fillText("Happy new year! 🥳", canvas.width / 2, canvas.height / 2);
+				ctx.font = "bold 100px Comic Mono";
+				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);
+
+				ctx.font = "bold 10px Comic Mono";
+				ctx.fillStyle = "#0000ff";
+				ctx.textAlign = "left";
+				ctx.fillText("Press 'h' to hide", 10, canvas.height - 10);
+			}, 10);
+		</script>
+	</div>
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 	</body>
 </html>