X-Git-Url: http://source.jalview.org/gitweb/?a=blobdiff_plain;f=src%2Fjalview%2Fgui%2FAnnotationPanel.java;fp=src%2Fjalview%2Fgui%2FAnnotationPanel.java;h=7c28bd0dfde5c9347f0dd36c64a383bbba7f9e3e;hb=fbfbbe26bee37143d5279fe4d254a5a89c96b021;hp=908addfafa54bb1f3ca9870311e013c3f5a08d6a;hpb=8286731258d314669ee6facb627947fe159ac1eb;p=jalview.git

diff --git a/src/jalview/gui/AnnotationPanel.java b/src/jalview/gui/AnnotationPanel.java
index 908addf..7c28bd0 100755
--- a/src/jalview/gui/AnnotationPanel.java
+++ b/src/jalview/gui/AnnotationPanel.java
@@ -355,7 +355,8 @@ public class AnnotationPanel extends JPanel implements AwtRenderPanelI,
         @Override
         public void colourSelected(Color c)
         {
-          HiddenColumns hiddenColumns = av.getAlignment().getHiddenColumns();
+          HiddenColumns hiddenColumns = av.getAlignment()
+                  .getHiddenColumns();
           for (int index : av.getColumnSelection().getSelected())
           {
             if (hiddenColumns.isVisible(index))
@@ -366,10 +367,11 @@ public class AnnotationPanel extends JPanel implements AwtRenderPanelI,
               }
               fAnot[index].colour = c;
             }
-        }};
+          }
+        };
       };
-      JalviewColourChooser.showColourChooser(this,
-              title, Color.black, listener);
+      JalviewColourChooser.showColourChooser(this, title, Color.black,
+              listener);
     }
     else
     // HELIX, SHEET or STEM
@@ -999,7 +1001,9 @@ public class AnnotationPanel extends JPanel implements AwtRenderPanelI,
   }
 
   private volatile boolean imageFresh = false;
-  private Rectangle visibleRect = new Rectangle(), clipBounds = new Rectangle();
+
+  private Rectangle visibleRect = new Rectangle(),
+          clipBounds = new Rectangle();
 
   /**
    * DOCUMENT ME!
@@ -1010,27 +1014,28 @@ public class AnnotationPanel extends JPanel implements AwtRenderPanelI,
   @Override
   public void paintComponent(Graphics g)
   {
-	  
-	  // BH: note that this method is generally recommended to 
-	  // call super.paintComponent(g). Otherwise, the children of this
-	  // component will not be rendered. That is not needed here 
-	  // because AnnotationPanel does not have any children. It is
-	  // just a JPanel contained in a JViewPort. 
+
+    // BH: note that this method is generally recommended to
+    // call super.paintComponent(g). Otherwise, the children of this
+    // component will not be rendered. That is not needed here
+    // because AnnotationPanel does not have any children. It is
+    // just a JPanel contained in a JViewPort.
 
     computeVisibleRect(visibleRect);
-    
+
     g.setColor(Color.white);
     g.fillRect(0, 0, visibleRect.width, visibleRect.height);
 
     if (image != null)
     {
-    	// BH 2018 optimizing generation of new Rectangle().
-      if (fastPaint || (visibleRect.width != (clipBounds = g.getClipBounds(clipBounds)).width)
-            || (visibleRect.height != clipBounds.height))
+      // BH 2018 optimizing generation of new Rectangle().
+      if (fastPaint
+              || (visibleRect.width != (clipBounds = g
+                      .getClipBounds(clipBounds)).width)
+              || (visibleRect.height != clipBounds.height))
       {
 
-    	  
-    	  g.drawImage(image, 0, 0, this);
+        g.drawImage(image, 0, 0, this);
         fastPaint = false;
         return;
       }
@@ -1077,11 +1082,13 @@ public class AnnotationPanel extends JPanel implements AwtRenderPanelI,
       gg.setColor(Color.white);
       gg.fillRect(0, 0, imgWidth, image.getHeight());
       imageFresh = true;
-    } else {
-        gg = (Graphics2D) image.getGraphics();
+    }
+    else
+    {
+      gg = (Graphics2D) image.getGraphics();
 
     }
-    
+
     drawComponent(gg, av.getRanges().getStartRes(),
             av.getRanges().getEndRes() + 1);
     gg.dispose();
@@ -1117,19 +1124,21 @@ public class AnnotationPanel extends JPanel implements AwtRenderPanelI,
 
     Graphics2D gg = (Graphics2D) image.getGraphics();
 
-    gg.copyArea(0, 0, imgWidth, getHeight(),
-            -horizontal * av.getCharWidth(), 0);
-
-    if (horizontal > 0) // scrollbar pulled right, image to the left
-    {
-      transX = (er - sr - horizontal) * av.getCharWidth();
-      sr = er - horizontal;
-    }
-    else if (horizontal < 0)
-    {
-      er = sr - horizontal;
+    if (imgWidth>Math.abs(horizontal*av.getCharWidth())) {
+      //scroll is less than imgWidth away so can re-use buffered graphics
+      gg.copyArea(0, 0, imgWidth, getHeight(),
+              -horizontal * av.getCharWidth(), 0);
+      
+      if (horizontal > 0) // scrollbar pulled right, image to the left
+      {
+        transX = (er - sr - horizontal) * av.getCharWidth();
+        sr = er - horizontal;
+      }
+      else if (horizontal < 0)
+      {
+        er = sr - horizontal;
+      }
     }
-
     gg.translate(transX, 0);
 
     drawComponent(gg, sr, er);
@@ -1137,7 +1146,7 @@ public class AnnotationPanel extends JPanel implements AwtRenderPanelI,
     gg.translate(-transX, 0);
 
     gg.dispose();
-    
+
     fastPaint = true;
 
     // Call repaint on alignment panel so that repaints from other alignment
@@ -1281,7 +1290,7 @@ public class AnnotationPanel extends JPanel implements AwtRenderPanelI,
     ap = null;
     image = null;
     fadedImage = null;
-//    gg = null;
+    // gg = null;
     _mwl = null;
 
     /*