X-Git-Url: http://source.jalview.org/gitweb/?p=jalview.git;a=blobdiff_plain;f=src%2Fjalview%2Fgui%2FAnnotationPanel.java;h=e9ef19c03eee53a7f83cdfd88541c743b1c7627c;hp=756e544c8815178a4cdf2fce07d92b84bced5306;hb=71a3cc0202bd8b731f01e5706372e9bae047d592;hpb=11346f873e4ecb2d191499fd1d52b8de07a65bf3

diff --git a/src/jalview/gui/AnnotationPanel.java b/src/jalview/gui/AnnotationPanel.java
index 756e544..e9ef19c 100755
--- a/src/jalview/gui/AnnotationPanel.java
+++ b/src/jalview/gui/AnnotationPanel.java
@@ -1124,19 +1124,21 @@ public class AnnotationPanel extends JPanel implements AwtRenderPanelI,
 
     Graphics2D gg = (Graphics2D) image.getGraphics();
 
-    gg.copyArea(0, 0, imgWidth, getHeight(),
-            -horizontal * av.getCharWidth(), 0);
-
-    if (horizontal > 0) // scrollbar pulled right, image to the left
-    {
-      transX = (er - sr - horizontal) * av.getCharWidth();
-      sr = er - horizontal;
-    }
-    else if (horizontal < 0)
-    {
-      er = sr - horizontal;
+    if (imgWidth>Math.abs(horizontal*av.getCharWidth())) {
+      //scroll is less than imgWidth away so can re-use buffered graphics
+      gg.copyArea(0, 0, imgWidth, getHeight(),
+              -horizontal * av.getCharWidth(), 0);
+      
+      if (horizontal > 0) // scrollbar pulled right, image to the left
+      {
+        transX = (er - sr - horizontal) * av.getCharWidth();
+        sr = er - horizontal;
+      }
+      else if (horizontal < 0)
+      {
+        er = sr - horizontal;
+      }
     }
-
     gg.translate(transX, 0);
 
     drawComponent(gg, sr, er);