[ARVADOS] updated: c25faef6db41c5daeff420871b7d5683c25d62fa

[git at public.curoverse.com]

Summary of changes:
 apps/workbench/app/views/collections/show.html.erb |    8 ++++----
 1 files changed, 4 insertions(+), 4 deletions(-)

       via  c25faef6db41c5daeff420871b7d5683c25d62fa (commit)
      from  489595e9636f7a271774cc8188f691d49f514e43 (commit)

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commit c25faef6db41c5daeff420871b7d5683c25d62fa
Author: Peter Amstutz <peter.amstutz at curoverse.com>
Date:   Mon Jan 27 16:19:05 2014 -0500

    Adjusts scrollbar to maintain center of image when zooming

diff --git a/apps/workbench/app/views/collections/show.html.erb b/apps/workbench/app/views/collections/show.html.erb
index bbb7d20..42b732f 100644
--- a/apps/workbench/app/views/collections/show.html.erb
+++ b/apps/workbench/app/views/collections/show.html.erb
@@ -147,13 +147,13 @@
 
     function graph_zoom(scale) {
       var pg = document.getElementById("provenance_graph");
-      var st = pg.scrollTop / pg.scrollTopMax;
-      var sl = pg.scrollLeft / pg.scrollLeftMax;
+      vcenter = (pg.scrollTop + (pg.scrollHeight - pg.scrollTopMax)/2.0) / pg.scrollHeight;
+      hcenter = (pg.scrollLeft + (pg.scrollWidth - pg.scrollLeftMax)/2.0) / pg.scrollWidth;
       var g = document.getElementById("graph1").parentNode;
       g.setAttribute("height", parseFloat(g.getAttribute("height")) * scale);
       g.setAttribute("width", parseFloat(g.getAttribute("width")) * scale);
-      pg.scrollTop = st * pg.scrollTopMax;
-      pg.scrollLeft = sl * pg.scrollLeftMax;
+      pg.scrollTop = (vcenter * pg.scrollHeight) - (pg.scrollHeight - pg.scrollTopMax)/2.0;
+      pg.scrollLeft = (hcenter * pg.scrollWidth) - (pg.scrollWidth - pg.scrollLeftMax)/2.0;
     }
   </script>
   <div style="text-align: right">

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