From b28368c859a7b7c6b3155f1e5df8b1b1d52139f6 Mon Sep 17 00:00:00 2001
From: Mitsuhiro Tanda <mitsuhiro.tanda@gmail.com>
Date: Tue, 31 May 2016 01:41:42 +0900
Subject: [PATCH] cache panel width

---
 public/app/plugins/panel/graph/graph.js | 17 ++++++++++++++---
 1 file changed, 14 insertions(+), 3 deletions(-)

diff --git a/public/app/plugins/panel/graph/graph.js b/public/app/plugins/panel/graph/graph.js
index 86ad3b5f025..9f0c3ff06eb 100755
--- a/public/app/plugins/panel/graph/graph.js
+++ b/public/app/plugins/panel/graph/graph.js
@@ -31,6 +31,7 @@ function (angular, $, moment, _, kbn, GraphTooltip) {
         var sortedSeries;
         var legendSideLastValue = null;
         var rootScope = scope.$root;
+        var panelWidth = 0;
 
         rootScope.onAppEvent('setCrosshair', function(event, info) {
           // do not need to to this if event is from this panel
@@ -104,7 +105,7 @@ function (angular, $, moment, _, kbn, GraphTooltip) {
             return true;
           }
 
-          if (elem.width() === 0) {
+          if (panelWidth === 0) {
             return true;
           }
         }
@@ -159,6 +160,16 @@ function (angular, $, moment, _, kbn, GraphTooltip) {
 
         // Function for rendering panel
         function render_panel() {
+          if (!rootScope.panelWidthCache) {
+            rootScope.panelWidthCache = {};
+          }
+          if (rootScope.panelWidthCache[panel.span]) {
+            panelWidth = rootScope.panelWidthCache[panel.span];
+          } else {
+            panelWidth = elem.width();
+            rootScope.panelWidthCache[panel.span] = panelWidth;
+          }
+
           if (shouldAbortRender()) {
             return;
           }
@@ -276,7 +287,7 @@ function (angular, $, moment, _, kbn, GraphTooltip) {
         }
 
         function addTimeAxis(options) {
-          var ticks = elem.width() / 100;
+          var ticks = panelWidth / 100;
           var min = _.isUndefined(ctrl.range.from) ? null : ctrl.range.from.valueOf();
           var max = _.isUndefined(ctrl.range.to) ? null : ctrl.range.to.valueOf();
 
@@ -444,7 +455,7 @@ function (angular, $, moment, _, kbn, GraphTooltip) {
         }
 
         function render_panel_as_graphite_png(url) {
-          url += '&width=' + elem.width();
+          url += '&width=' + panelWidth;
           url += '&height=' + elem.css('height').replace('px', '');
           url += '&bgcolor=1f1f1f'; // @grayDarker & @grafanaPanelBackground
           url += '&fgcolor=BBBFC2'; // @textColor & @grayLighter