From 84d2dcf11ddbca900a940523c5a69a882cf6df7e Mon Sep 17 00:00:00 2001
From: Rainer Simon <rainer@rainersimon.io>
Date: Sat, 25 Mar 2023 18:38:41 +0100
Subject: [PATCH] Applied touch rotate fix suggested in #2319

---
 src/viewer.js | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/viewer.js b/src/viewer.js
index af5bcf05..78c1c35d 100644
--- a/src/viewer.js
+++ b/src/viewer.js
@@ -3422,7 +3422,8 @@ function onCanvasPinch( event ) {
                 event.gesturePoints[0].currentPos.x - event.gesturePoints[1].currentPos.x);
             var angle2 = Math.atan2(event.gesturePoints[0].lastPos.y - event.gesturePoints[1].lastPos.y,
                 event.gesturePoints[0].lastPos.x - event.gesturePoints[1].lastPos.x);
-            this.viewport.setRotation(this.viewport.getRotation() + ((angle1 - angle2) * (180 / Math.PI)));
+            centerPt = this.viewport.pointFromPixel( event.center, true );
+            this.viewport.rotateTo(this.viewport.getRotation(true) + ((angle1 - angle2) * (180 / Math.PI)), centerPt, true);
         }
     }
 }