X-Git-Url: http://source.jalview.org/gitweb/?a=blobdiff_plain;ds=sidebyside;f=src%2Fjalview%2Fgui%2FOverviewCanvas.java;h=ca27a9cfb77322252f0630735638ea289b7a096c;hb=5d4b4eb70fb510e1720259328bfc7ac201373c5e;hp=34fbc971b1661e5cd97ef40636eb524d38cde40b;hpb=a958faf67348b6360f735e51b9b23c24976014cf;p=jalview.git

diff --git a/src/jalview/gui/OverviewCanvas.java b/src/jalview/gui/OverviewCanvas.java
index 34fbc97..ca27a9c 100644
--- a/src/jalview/gui/OverviewCanvas.java
+++ b/src/jalview/gui/OverviewCanvas.java
@@ -31,9 +31,9 @@ import java.awt.Dimension;
 import java.awt.Graphics;
 import java.awt.image.BufferedImage;
 
-import javax.swing.JComponent;
+import javax.swing.JPanel;
 
-public class OverviewCanvas extends JComponent
+public class OverviewCanvas extends JPanel
 {
   private static final Color TRANS_GREY = new Color(100, 100, 100, 25);
 
@@ -157,8 +157,7 @@ public class OverviewCanvas extends JComponent
     {
       mg.translate(0, od.getSequencesHeight());
       or.drawGraph(mg, av.getAlignmentConservationAnnotation(),
-              av.getCharWidth(), od.getGraphHeight(),
-              od.getColumns(av.getAlignment()));
+              od.getGraphHeight(), od.getColumns(av.getAlignment()));
       mg.translate(0, -od.getSequencesHeight());
     }
 
@@ -182,7 +181,7 @@ public class OverviewCanvas extends JComponent
   @Override
   public void paintComponent(Graphics g)
   {
-    // super.paintComponent(g);
+    //super.paintComponent(g);
 
     if (restart)
     {
@@ -207,7 +206,9 @@ public class OverviewCanvas extends JComponent
       {
         // if there is annotation, scale the alignment and annotation
         // separately
-        if (od.getGraphHeight() > 0)
+        if (od.getGraphHeight() > 0 
+        		&& od.getSequencesHeight() > 0  // BH 2019
+        		)
         {
           BufferedImage topImage = lastMiniMe.getSubimage(0, 0,
                   od.getWidth(), od.getSequencesHeight());
@@ -258,6 +259,7 @@ public class OverviewCanvas extends JComponent
   public void dispose()
   {
     dispose = true;
+    od = null;
     synchronized (this)
     {
       restart = true;