From c0ed2122f4eca7ed5f21e0a3f287692e58c3b771 Mon Sep 17 00:00:00 2001
From: Barth Netterfield <netterfield@astro.utoronto.ca>
Date: Thu, 4 Dec 2014 00:22:49 -0500
Subject: [PATCH] Fix crash in Zoom Mean Centered and shared axis boxes.

---
 src/libkstapp/plotitem.cpp          |  4 ++--
 src/libkstapp/sharedaxisboxitem.cpp | 11 ++++++-----
 src/libkstapp/sharedaxisboxitem.h   |  2 +-
 3 files changed, 9 insertions(+), 8 deletions(-)

diff --git a/src/libkstapp/plotitem.cpp b/src/libkstapp/plotitem.cpp
index 615cf169f..09bc49eb0 100644
--- a/src/libkstapp/plotitem.cpp
+++ b/src/libkstapp/plotitem.cpp
@@ -3075,7 +3075,7 @@ void PlotItem::zoomMeanCentered(bool force) {
 
 void PlotItem::zoomYMeanCentered(qreal dY, bool force) {
   if (isInSharedAxisBox() && !force) {
-    sharedAxisBox()->zoomYMeanCentered(this);
+    sharedAxisBox()->zoomYMeanCentered(dY, this);
   } else {
     ZoomCommand *cmd = new ZoomYMeanCenteredCommand(this, dY, force);
     _undoStack->push(cmd);
@@ -4099,7 +4099,7 @@ void ZoomYMeanCenteredCommand::applyZoomTo(ViewItem *item, bool applyX, bool app
   SharedAxisBoxItem *shareBox = qobject_cast<SharedAxisBoxItem*>(item);
   if (shareBox) {
     if (applyY) {
-      shareBox->zoomYMeanCentered(0);
+      shareBox->zoomYMeanCentered(_dY, 0);
     }
   }
 }
diff --git a/src/libkstapp/sharedaxisboxitem.cpp b/src/libkstapp/sharedaxisboxitem.cpp
index e13755bde..e10f0f50a 100644
--- a/src/libkstapp/sharedaxisboxitem.cpp
+++ b/src/libkstapp/sharedaxisboxitem.cpp
@@ -594,12 +594,13 @@ void SharedAxisBoxItem::zoomMeanCentered(PlotItem* originPlotItem) {
   applyZoom(computeRect(PlotAxis::Auto, PlotAxis::MeanCentered), originPlotItem, false, true);
 }
 
-void SharedAxisBoxItem::zoomYMeanCentered(PlotItem* originPlotItem) {
-  _yAxisZoomMode = PlotAxis::MeanCentered;
-  if (originPlotItem) {
-    originPlotItem->zoomYMeanCentered(true);
+void SharedAxisBoxItem::zoomYMeanCentered(qreal dY, PlotItem* originPlotItem) {
+  if (!_shareY) {
+    _yAxisZoomMode = PlotAxis::MeanCentered;
+    if (originPlotItem) {
+      originPlotItem->zoomYMeanCentered(dY, true);
+    }
   }
-  applyZoom(computeRect(PlotAxis::Auto, PlotAxis::MeanCentered), originPlotItem, false, true);
 }
 
 void SharedAxisBoxItem::zoomXMeanCentered(PlotItem* originPlotItem) {
diff --git a/src/libkstapp/sharedaxisboxitem.h b/src/libkstapp/sharedaxisboxitem.h
index 6e737044a..d57c7672d 100644
--- a/src/libkstapp/sharedaxisboxitem.h
+++ b/src/libkstapp/sharedaxisboxitem.h
@@ -87,7 +87,7 @@ class SharedAxisBoxItem : public ViewItem
     void zoomNormalizeXtoY(PlotItem* originPlotItem);
     void zoomLogX(PlotItem* originPlotItem, bool autoEnable = true, bool enable = true);
 
-    void zoomYMeanCentered(PlotItem* originPlotItem);
+    void zoomYMeanCentered(qreal dY, PlotItem* originPlotItem);
     void zoomYLocalMaximum(PlotItem* originPlotItem);
     void zoomYMaximum(PlotItem* originPlotItem);
     void zoomYNoSpike(PlotItem* originPlotItem);