From 36192ebcb63fc6f2a832b06121fb93976a2e6ca2 Mon Sep 17 00:00:00 2001
From: gmungoc <g.m.carstairs@dundee.ac.uk>
Date: Fri, 4 May 2018 16:14:27 +0100
Subject: [PATCH] JAL-2975 Shift-arrow keys to rotate PCA incrementally

---
 src/jalview/appletgui/RotatableCanvas.java |   32 ++++++++++++++++++++++++----
 src/jalview/gui/RotatableCanvas.java       |   27 +++++++++++++++++++++--
 2 files changed, 53 insertions(+), 6 deletions(-)

diff --git a/src/jalview/appletgui/RotatableCanvas.java b/src/jalview/appletgui/RotatableCanvas.java
index 2a49d0b..34f8ea5 100755
--- a/src/jalview/appletgui/RotatableCanvas.java
+++ b/src/jalview/appletgui/RotatableCanvas.java
@@ -392,13 +392,37 @@ public class RotatableCanvas extends Panel implements MouseListener,
   @Override
   public void keyPressed(KeyEvent evt)
   {
-    if (evt.getKeyCode() == KeyEvent.VK_UP)
+    boolean shiftDown = evt.isShiftDown();
+    int keyCode = evt.getKeyCode();
+    if (keyCode == KeyEvent.VK_UP)
     {
-      zoom(1.1f);
+      if (shiftDown)
+      {
+        rotate(0f, -1f);
+      }
+      else
+      {
+        zoom(1.1f);
+      }
+    }
+    else if (keyCode == KeyEvent.VK_DOWN)
+    {
+      if (shiftDown)
+      {
+        rotate(0f, 1f);
+      }
+      else
+      {
+        zoom(0.9f);
+      }
+    }
+    else if (shiftDown && keyCode == KeyEvent.VK_LEFT)
+    {
+      rotate(1f, 0f);
     }
-    else if (evt.getKeyCode() == KeyEvent.VK_DOWN)
+    else if (shiftDown && keyCode == KeyEvent.VK_RIGHT)
     {
-      zoom(0.9f);
+      rotate(-1f, 0f);
     }
     else if (evt.getKeyChar() == 's')
     {
diff --git a/src/jalview/gui/RotatableCanvas.java b/src/jalview/gui/RotatableCanvas.java
index da48dd6..86fe483 100755
--- a/src/jalview/gui/RotatableCanvas.java
+++ b/src/jalview/gui/RotatableCanvas.java
@@ -475,14 +475,37 @@ public class RotatableCanvas extends JPanel implements MouseListener,
   public void keyPressed(KeyEvent evt)
   {
     int keyCode = evt.getKeyCode();
+    boolean shiftDown = evt.isShiftDown();
 
     if (keyCode == KeyEvent.VK_UP)
     {
-      zoom(ZOOM_IN);
+      if (shiftDown)
+      {
+        rotate(0f, -1f);
+      }
+      else
+      {
+        zoom(ZOOM_IN);
+      }
     }
     else if (keyCode == KeyEvent.VK_DOWN)
     {
-      zoom(ZOOM_OUT);
+      if (shiftDown)
+      {
+        rotate(0f, 1f);
+      }
+      else
+      {
+        zoom(ZOOM_OUT);
+      }
+    }
+    else if (shiftDown && keyCode == KeyEvent.VK_LEFT)
+    {
+      rotate(1f, 0f);
+    }
+    else if (shiftDown && keyCode == KeyEvent.VK_RIGHT)
+    {
+      rotate(-1f, 0f);
     }
     else if (evt.getKeyChar() == 's')
     {
-- 
1.7.10.2