From 3cca9450027bfa31171014bfa47f4c47c8de4b72 Mon Sep 17 00:00:00 2001
From: Andreas Hocevar <andreas.hocevar@gmail.com>
Date: Mon, 18 Nov 2019 07:54:20 +0100
Subject: [PATCH] Do not use Math.sign() to support very old browsers

---
 src/ol/interaction/MouseWheelZoom.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/ol/interaction/MouseWheelZoom.js b/src/ol/interaction/MouseWheelZoom.js
index 02824a1151..1ed762bc17 100644
--- a/src/ol/interaction/MouseWheelZoom.js
+++ b/src/ol/interaction/MouseWheelZoom.js
@@ -154,7 +154,7 @@ class MouseWheelZoom extends Interaction {
   endInteraction_() {
     this.trackpadTimeoutId_ = undefined;
     const view = this.getMap().getView();
-    view.endInteraction(undefined, Math.sign(this.lastDelta_), this.lastAnchor_);
+    view.endInteraction(undefined, this.lastDelta_ ? (this.lastDelta_ > 0 ? 1 : -1) : 0, this.lastAnchor_);
   }
 
   /**