From 76f5a0ed33b848973c19e3522234558e36ade038 Mon Sep 17 00:00:00 2001
From: Gehan Gonsalkorale <gehan.g@gmail.com>
Date: Tue, 11 Jul 2017 10:58:52 +0100
Subject: [PATCH] Fix for #1232 - constrainDuringPan causes jitter on mobile

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

diff --git a/src/viewer.js b/src/viewer.js
index 936e4eaf..99e3fa30 100644
--- a/src/viewer.js
+++ b/src/viewer.js
@@ -2699,7 +2699,7 @@ function onCanvasDrag( event ) {
             }
         }
 
-        this.viewport.panBy( this.viewport.deltaPointsFromPixels( event.delta.negate() ), gestureSettings.flickEnabled );
+        this.viewport.panBy( this.viewport.deltaPointsFromPixels( event.delta.negate() ), gestureSettings.flickEnabled && !this.constrainDuringPan);
     }
 }