From 1f3d03f7f8600b501acfde3913122672e05aeff3 Mon Sep 17 00:00:00 2001
From: llama <gh@siid.sh>
Date: Tue, 22 Jul 2025 19:32:42 +0800
Subject: [PATCH] add io mask rotation snapping (#4214)

---
 ts/routes/image-occlusion/mask-editor.ts | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/ts/routes/image-occlusion/mask-editor.ts b/ts/routes/image-occlusion/mask-editor.ts
index c5492d413..b632abf98 100644
--- a/ts/routes/image-occlusion/mask-editor.ts
+++ b/ts/routes/image-occlusion/mask-editor.ts
@@ -106,6 +106,9 @@ function initCanvas(): fabric.Canvas {
     fabric.Object.prototype.cornerStyle = "circle";
     fabric.Object.prototype.cornerStrokeColor = "#000000";
     fabric.Object.prototype.padding = 8;
+    // snap rotation around 0 by +-3deg
+    fabric.Object.prototype.snapAngle = 360;
+    fabric.Object.prototype.snapThreshold = 3;
     // disable rotation when selecting
     canvas.on("selection:created", () => {
         const g = canvas.getActiveObject();