From c9d29ea600f2b9673746c556abfb036415fb15c8 Mon Sep 17 00:00:00 2001
From: dwelle <5153846+dwelle@users.noreply.github.com>
Date: Fri, 3 Apr 2026 19:36:06 +0200
Subject: [PATCH] improve miter

---
 packages/element/src/shape.ts        |  6 +++++-
 packages/element/tests/shape.test.ts | 13 +++++++++++++
 2 files changed, 18 insertions(+), 1 deletion(-)

diff --git a/packages/element/src/shape.ts b/packages/element/src/shape.ts
index 85e4327a1f..a74610bad4 100644
--- a/packages/element/src/shape.ts
+++ b/packages/element/src/shape.ts
@@ -1258,6 +1258,7 @@ const getSvgPathFromPoints = (
 
 const FIXED_FREEDRAW_MIN_SMOOTH_ALIGNMENT = 0.6;
 const FIXED_FREEDRAW_MIN_SMOOTH_SEGMENT_LENGTH = 0.2;
+const FIXED_FREEDRAW_MIN_CORNER_ALIGNMENT = -0.25;
 const FIXED_FREEDRAW_MIN_CORNER_ROUNDING = 0.75;
 const FIXED_FREEDRAW_MAX_CORNER_ROUNDING = 6;
 const FIXED_FREEDRAW_CORNER_ROUNDING_FACTOR = 0.35;
@@ -1310,7 +1311,10 @@ const getFixedFreeDrawRoundedCorner = (
     (previousDeltaX * nextDeltaX + previousDeltaY * nextDeltaY) /
     (previousSegmentLength * nextSegmentLength);
 
-  if (alignment >= FIXED_FREEDRAW_MIN_SMOOTH_ALIGNMENT) {
+  if (
+    alignment >= FIXED_FREEDRAW_MIN_SMOOTH_ALIGNMENT ||
+    alignment <= FIXED_FREEDRAW_MIN_CORNER_ALIGNMENT
+  ) {
     return null;
   }
 
diff --git a/packages/element/tests/shape.test.ts b/packages/element/tests/shape.test.ts
index 9608832d45..ff606173e4 100644
--- a/packages/element/tests/shape.test.ts
+++ b/packages/element/tests/shape.test.ts
@@ -43,6 +43,19 @@ describe("freedraw stroke shape", () => {
     expect(path).toBe("M0,0 L8.5,0 Q10,0 10,1.5 L10,10 ");
   });
 
+  it("does not round fixed stroke hairpin turns", () => {
+    const element = API.createElement({
+      type: "freedraw",
+      strokeShape: "fixed",
+      strokeWidth: 1,
+      points: [pointFrom(0, 0), pointFrom(10, 0), pointFrom(9, 1)],
+    });
+
+    const [path] = ShapeCache.generateElementShape(element, null);
+
+    expect(path).toBe("M0,0 L10,0 L9,1 ");
+  });
+
   it("smooths dense fixed stroke points without dropping them", () => {
     const element = API.createElement({
       type: "freedraw",