From 3e89d2998588f8e35c524e523ba2ee853f0f6475 Mon Sep 17 00:00:00 2001
From: Maze Winther <mazewinther@gmail.com>
Date: Mon, 20 Apr 2026 11:31:17 +0200
Subject: refactor: restructure files to their domains,  new preview overlay
 system, and dep graph

---
 apps/web/src/masks/param-update.ts | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)
 create mode 100644 apps/web/src/masks/param-update.ts

(limited to 'apps/web/src/masks/param-update.ts')

diff --git a/apps/web/src/masks/param-update.ts b/apps/web/src/masks/param-update.ts
new file mode 100644
index 00000000..e5c7f5b7
--- /dev/null
+++ b/apps/web/src/masks/param-update.ts
@@ -0,0 +1,26 @@
+import { FEATHER_HANDLE_SCALE, MAX_FEATHER } from "@/masks/feather";
+
+export function computeFeatherUpdate({
+	startFeather,
+	deltaX,
+	deltaY,
+	directionX,
+	directionY,
+}: {
+	startFeather: number;
+	deltaX: number;
+	deltaY: number;
+	directionX: number;
+	directionY: number;
+}): { feather: number } {
+	const projection = deltaX * directionX + deltaY * directionY;
+	return {
+		feather: Math.max(
+			0,
+			Math.min(
+				MAX_FEATHER,
+				Math.round(startFeather + projection / FEATHER_HANDLE_SCALE),
+			),
+		),
+	};
+}
-- 
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