From 7898810244a7a4e4cba43c7ec0bedc095e1f4be4 Mon Sep 17 00:00:00 2001
From: Karsten Schmidt <k@thi.ng>
Date: Sun, 15 Aug 2021 22:43:08 +0200
Subject: [PATCH] fix(geom-clip-line): off-by-one error in clipLinePoly()

---
 packages/geom-clip-line/src/clip-poly.ts | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/packages/geom-clip-line/src/clip-poly.ts b/packages/geom-clip-line/src/clip-poly.ts
index 68628e0b3b..a2c4c33dd1 100644
--- a/packages/geom-clip-line/src/clip-poly.ts
+++ b/packages/geom-clip-line/src/clip-poly.ts
@@ -19,11 +19,15 @@ export const clipLinePoly = (
     b: ReadonlyVec,
     pts: ReadonlyVec[]
 ) => {
-    const isecs = intersectRayPolylineAll(a, direction([], a, b), pts, true)
-        .isec;
+    const isecs = intersectRayPolylineAll(
+        a,
+        direction([], a, b),
+        pts,
+        true
+    ).isec;
     if (!isecs) return;
     const segments: Vec[][] = [];
-    for (let i = 0; i < isecs.length; i += 2) {
+    for (let i = 0, n = isecs.length - 1; i < n; i += 2) {
         segments.push([<Vec>isecs[i], <Vec>isecs[i + 1]]);
     }
     return segments;