X-Git-Url: http://source.jalview.org/gitweb/?a=blobdiff_plain;f=src%2Fjalview%2Fgui%2FIdCanvas.java;h=959c83c28264a1a1bc73219b2d3958a0e4483cf2;hb=eae0a6cd988e80f75caeee3ba92822fbee6e227d;hp=cb7fddfd70e891075c7971d20aa4c152245a2abb;hpb=4532dfefeac026198bfea1b9dbe84186e870bfc8;p=jalview.git

diff --git a/src/jalview/gui/IdCanvas.java b/src/jalview/gui/IdCanvas.java
index cb7fddf..959c83c 100755
--- a/src/jalview/gui/IdCanvas.java
+++ b/src/jalview/gui/IdCanvas.java
@@ -17,6 +17,7 @@ public class IdCanvas extends JPanel
   BufferedImage image;
   Graphics2D gg;
   int imgHeight=0;
+  boolean fastPaint = false;
 
   public IdCanvas(AlignViewport av)
   {
@@ -49,11 +50,8 @@ public class IdCanvas extends JPanel
 
   public void fastPaint(int vertical)
   {
-    if(image==null)
-    {
-      repaint();
-      return;
-    }
+    if(gg==null)
+    {  repaint(); return;}
 
     gg.copyArea( 0,0, getWidth(), imgHeight, 0, -vertical*av.charHeight );
 
@@ -75,11 +73,22 @@ public class IdCanvas extends JPanel
         gg.translate( 0, -transY );
 
 
-    getGraphics().drawImage(image, 0, 0, this);
+      fastPaint = true;
+      repaint();
   }
 
   public void paintComponent(Graphics g)
   {
+    g.setColor(Color.white);
+    g.fillRect(0, 0, getWidth(), getHeight());
+
+    if (fastPaint)
+    {
+      g.drawImage(image, 0, 0, this);
+      fastPaint = false;
+      return;
+    }
+
     imgHeight = getHeight();
     imgHeight -= imgHeight % av.charHeight;
     image = new BufferedImage(getWidth(), imgHeight, BufferedImage.TYPE_INT_RGB);
@@ -93,10 +102,6 @@ public class IdCanvas extends JPanel
                            av.getFont().getSize());
     gg.setFont(italic);
 
-
-    g.setColor(Color.white);
-    g.fillRect(0,0,getWidth(),getHeight());
-
     drawIds( av.getStartSeq(), av.endSeq);
 
     g.drawImage(image, 0, 0, this);