X-Git-Url: http://source.jalview.org/gitweb/?a=blobdiff_plain;ds=sidebyside;f=src%2Fjalview%2Fgui%2FSeqCanvas.java;h=c4424655edc22241d5fc2c48aab764569b5101ea;hb=b14411143cbfb4d311f68b3d3b73a645bf8200e8;hp=1194d08afceca7ad43f51caf76d68317ffdd3b40;hpb=588042b69abf8e60bcc950b24c283933c7dd422f;p=jalview.git

diff --git a/src/jalview/gui/SeqCanvas.java b/src/jalview/gui/SeqCanvas.java
index 1194d08..c442465 100755
--- a/src/jalview/gui/SeqCanvas.java
+++ b/src/jalview/gui/SeqCanvas.java
@@ -44,13 +44,15 @@ public class SeqCanvas
   int LABEL_WEST;
   int LABEL_EAST;
 
+
   public SeqCanvas(AlignViewport av)
   {
     this.av = av;
     fr = new FeatureRenderer(av);
     sr = new SequenceRenderer(av);
     setLayout(new BorderLayout());
-    PaintRefresher.Register(this);
+    PaintRefresher.Register(this, av.alignment);
+    setBackground(Color.white);
   }
 
   void drawNorthScale(Graphics g, int startx, int endx, int ypos)
@@ -212,16 +214,17 @@ public class SeqCanvas
    * NOTE 1: The av limits are set in setFont in this class and
    * in the adjustment listener in SeqPanel when the scrollbars move.
    */
+
+
+  // Set this to false to force a full panel paint
   public void paintComponent(Graphics g)
   {
-    g.setColor(Color.white);
-    g.fillRect(0, 0, getWidth(), getHeight());
-
-    if (fastPaint)
+    if (img!=null
+        && (fastPaint  ||  getWidth() !=  g.getClipBounds().width
+            ||  getHeight() != g.getClipBounds().height))
     {
       g.drawImage(img, 0, 0, this);
       fastPaint = false;
-
       return;
     }