From f4edf7a33ecaf0e9cdb7133ab9bfe053ac2b78d9 Mon Sep 17 00:00:00 2001
From: "Justin R. Miller" <incanus@codesorcery.net>
Date: Fri, 7 Feb 2014 12:37:48 -0500
Subject: [PATCH] fixes #35: decelerated pinch zooming

---
 ios/MBXViewController.mm | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/ios/MBXViewController.mm b/ios/MBXViewController.mm
index 53afcb6c9..5fe941fb9 100644
--- a/ios/MBXViewController.mm
+++ b/ios/MBXViewController.mm
@@ -212,6 +212,20 @@ class MBXMapView
 
         mapView->map.scaleBy(powf(2, newZoom) / mapView->map.getScale(), [pinch locationInView:pinch.view].x, [pinch locationInView:pinch.view].y);
     }
+    else if (pinch.state == UIGestureRecognizerStateEnded)
+    {
+        if (fabsf(pinch.velocity) < 20)
+            return;
+
+        CGFloat finalZoom = log2f(mapView->map.getScale()) + (0.01 * pinch.velocity);
+
+        double scale = mapView->map.getScale();
+        double new_scale = powf(2, finalZoom);
+
+        CGFloat duration = ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPad ? 0.5 : 0.5);
+
+        mapView->map.scaleBy(new_scale / scale, [pinch locationInView:pinch.view].x, [pinch locationInView:pinch.view].y, duration);
+    }
 
     [self startRender];
 }