refactor(frontend): scripts -> utility

1 files changed, 30 insertions, 0 deletions

diff --git a/packages/frontend/src/utility/confetti.ts b/packages/frontend/src/utility/confetti.ts
new file mode 100644
index 0000000000..8e53a6ceeb
--- /dev/null
+++ b/packages/frontend/src/utility/confetti.ts
@@ -0,0 +1,30 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+import _confetti from 'canvas-confetti';
+import * as os from '@/os.js';
+
+export function confetti(options: { duration?: number; } = {}) {
+	const duration = options.duration ?? 1000 * 4;
+	const animationEnd = Date.now() + duration;
+	const defaults = { startVelocity: 30, spread: 360, ticks: 60, zIndex: os.claimZIndex('high') };
+
+	function randomInRange(min, max) {
+		return Math.random() * (max - min) + min;
+	}
+
+	const interval = setInterval(() => {
+		const timeLeft = animationEnd - Date.now();
+
+		if (timeLeft <= 0) {
+			return clearInterval(interval);
+		}
+
+		const particleCount = 50 * (timeLeft / duration);
+		// since particles fall down, start a bit higher than random
+		_confetti(Object.assign({}, defaults, { particleCount, origin: { x: randomInRange(0.1, 0.3), y: Math.random() - 0.2 } }));
+		_confetti(Object.assign({}, defaults, { particleCount, origin: { x: randomInRange(0.7, 0.9), y: Math.random() - 0.2 } }));
+	}, 250);
+}