From 301630e47eedac9d7f22dc6260134060f432bc47 Mon Sep 17 00:00:00 2001
From: Nils Schneider <nils@nilsschneider.net>
Date: Wed, 8 Jul 2015 15:17:09 +0200
Subject: [PATCH] forcegraph: fix translation of keyboard zoom

---
 lib/forcegraph.js | 16 ++++++++++++++--
 1 file changed, 14 insertions(+), 2 deletions(-)

diff --git a/lib/forcegraph.js b/lib/forcegraph.js
index 5b350a0..3d06055 100644
--- a/lib/forcegraph.js
+++ b/lib/forcegraph.js
@@ -469,6 +469,18 @@ define(["d3"], function (d3) {
       }
     }
 
+    function zoom(z, scale) {
+      var size = getSize()
+      var newSize = [size[0] / scale, size[1] / scale]
+
+      var sidebarWidth = sidebar.getWidth()
+      var delta = [size[0] - newSize[0], size[1] - newSize[1]]
+      var translate = z.translate()
+      var translateNew = [sidebarWidth + (translate[0] - sidebarWidth - delta[0] / 2) * scale, (translate[1] - delta[1] / 2) * scale]
+
+      animatePanzoom(translateNew, z.scale() * scale)
+    }
+
     function keyboardZoom(z) {
       return function () {
         var e = d3.event
@@ -477,10 +489,10 @@ define(["d3"], function (d3) {
           return
 
         if (e.keyCode === 43)
-            animatePanzoom(z.translate(), z.scale() * 1.41)
+          zoom(z, 1.41)
 
         if (e.keyCode === 45)
-            animatePanzoom(z.translate(), z.scale() / 1.41)
+          zoom(z, 1 / 1.41)
       }
     }