From 8279adc7979dfdc48ec209b1d85fe68425bba268 Mon Sep 17 00:00:00 2001
From: Paul Licameli <paul.licameli@audacityteam.org>
Date: Wed, 19 Jul 2017 14:44:42 -0400
Subject: [PATCH] Changing NoteTrack height, keep # of piano keys (roughly)
 constant...

This fix is imperfect, but quick and easy
---
 src/NoteTrack.cpp | 12 ++++++++++++
 src/NoteTrack.h   |  2 ++
 src/Track.h       |  2 +-
 3 files changed, 15 insertions(+), 1 deletion(-)

diff --git a/src/NoteTrack.cpp b/src/NoteTrack.cpp
index 5aeb2447f..8e2d1052b 100644
--- a/src/NoteTrack.cpp
+++ b/src/NoteTrack.cpp
@@ -210,6 +210,18 @@ double NoteTrack::GetEndTime() const
    return GetStartTime() + GetSeq().get_real_dur();
 }
 
+void NoteTrack::SetHeight(int h)
+{
+   auto oldHeight = GetHeight();
+   Track::SetHeight(h);
+   Zoom(
+      wxRect{ 0, 0, 1, h }, // only height matters
+      h - 1, // preserve bottom note
+      (float)h / std::max(1, oldHeight),
+      false
+   );
+}
+
 
 void NoteTrack::WarpAndTransposeNotes(double t0, double t1,
                                       const TimeWarper &warper,
diff --git a/src/NoteTrack.h b/src/NoteTrack.h
index 9a50fc9c7..090a71f14 100644
--- a/src/NoteTrack.h
+++ b/src/NoteTrack.h
@@ -84,6 +84,8 @@ class AUDACITY_DLL_API NoteTrack final
    double GetStartTime() const override;
    double GetEndTime() const override;
 
+   void SetHeight(int h) override;
+
    Alg_seq &GetSeq() const;
 
    void WarpAndTransposeNotes(double t0, double t1,
diff --git a/src/Track.h b/src/Track.h
index 9cee366f4..f8459db35 100644
--- a/src/Track.h
+++ b/src/Track.h
@@ -184,7 +184,7 @@ class AUDACITY_DLL_API Track /* not final */
    int GetY() const;
    void SetY(int y);
    int GetHeight() const;
-   void SetHeight(int h);
+   virtual void SetHeight(int h);
 #endif
    bool GetMinimized() const;
    void SetMinimized(bool isMinimized);