From 93fef07b17b7b6fca439e4b08b1f47a250a655bb Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E2=80=9Chclacids=E2=80=9D?= <“1246311560@qq.com”>
Date: Sat, 25 Sep 2021 23:21:36 +0800
Subject: [PATCH] fix: the cubic tangent at

---
 src/graphic/shape/BezierCurve.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/graphic/shape/BezierCurve.ts b/src/graphic/shape/BezierCurve.ts
index f23058f9b..3d63af803 100644
--- a/src/graphic/shape/BezierCurve.ts
+++ b/src/graphic/shape/BezierCurve.ts
@@ -31,7 +31,7 @@ export class BezierCurveShape {
 function someVectorAt(shape: BezierCurveShape, t: number, isTangent: boolean) {
     const cpx2 = shape.cpx2;
     const cpy2 = shape.cpy2;
-    if (cpx2 === null || cpy2 === null) {
+    if (cpx2 != null || cpy2 != null) {
         return [
             (isTangent ? cubicDerivativeAt : cubicAt)(shape.x1, shape.cpx1, shape.cpx2, shape.x2, t),
             (isTangent ? cubicDerivativeAt : cubicAt)(shape.y1, shape.cpy1, shape.cpy2, shape.y2, t)