X-Git-Url: http://source.jalview.org/gitweb/?a=blobdiff_plain;f=src%2Fjalview%2Fgui%2FOverviewCanvas.java;h=8e6799203478411dc3ba6ff1341dfa08e3b534de;hb=339d1bf247a3b0d000044892bee3d5668a8d9b11;hp=cc361a5010cbf3090c365b034b3a9f20e1b47017;hpb=77b160b053c41a5d5c95bf1bbc0fbd066435f70d;p=jalview.git

diff --git a/src/jalview/gui/OverviewCanvas.java b/src/jalview/gui/OverviewCanvas.java
index cc361a5..8e67992 100644
--- a/src/jalview/gui/OverviewCanvas.java
+++ b/src/jalview/gui/OverviewCanvas.java
@@ -25,15 +25,16 @@ import jalview.bin.Cache;
 import jalview.renderer.OverviewRenderer;
 import jalview.renderer.OverviewResColourFinder;
 import jalview.viewmodel.OverviewDimensions;
+import jalview.viewmodel.seqfeatures.FeatureRendererModel;
 
 import java.awt.Color;
 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);
 
@@ -132,7 +133,7 @@ public class OverviewCanvas extends JComponent
    *          the renderer to transfer feature colouring from
    */
   public void draw(boolean showSequenceFeatures, boolean showAnnotation,
-          FeatureRenderer transferRenderer)
+          FeatureRendererModel transferRenderer)
   {
     miniMe = null;
 
@@ -181,7 +182,7 @@ public class OverviewCanvas extends JComponent
   @Override
   public void paintComponent(Graphics g)
   {
-    super.paintComponent(g);
+    //super.paintComponent(g);
 
     if (restart)
     {
@@ -206,7 +207,9 @@ 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());
@@ -257,6 +260,7 @@ public class OverviewCanvas extends JComponent
   public void dispose()
   {
     dispose = true;
+    od = null;
     synchronized (this)
     {
       restart = true;