X-Git-Url: http://source.jalview.org/gitweb/?a=blobdiff_plain;f=src%2Fjalview%2Fgui%2FSeqCanvas.java;h=0f24b4b36e992fc8a443858b405497d2d4cece6f;hb=95b271e7afc0a09a6ccfcdb92422c69a9b989a7e;hp=5706fe76c9c7f7f6ac01db1c891cb5e8299123c8;hpb=4d7f98a6dd54d9863ba449ec79dcd95d25ed863d;p=jalview.git

diff --git a/src/jalview/gui/SeqCanvas.java b/src/jalview/gui/SeqCanvas.java
index 5706fe7..0f24b4b 100755
--- a/src/jalview/gui/SeqCanvas.java
+++ b/src/jalview/gui/SeqCanvas.java
@@ -335,6 +335,7 @@ public class SeqCanvas extends JComponent
    */
 
   // Set this to false to force a full panel paint
+  @Override
   public void paintComponent(Graphics g)
   {
     updateViewport();
@@ -682,10 +683,17 @@ public class SeqCanvas extends JComponent
         g1.translate(-screenY * charWidth, 0);
         screenY += blockEnd - blockStart + 1;
         blockStart = hideEnd + 1;
+
+        if (screenY > (endRes - startRes))
+        {
+          // already rendered last block
+          return;
+        }
       }
 
       if (screenY <= (endRes - startRes))
       {
+        // remaining visible region to render
         blockEnd = blockStart + (endRes - startRes) - screenY;
         g1.translate(screenY * charWidth, 0);
         draw(g1, blockStart, blockEnd, startSeq, endSeq, offset);