From 6df80899bb3100cd38064c62cda5a2bb85b4528d Mon Sep 17 00:00:00 2001
From: amwaterhouse <Andrew Waterhouse>
Date: Fri, 26 Aug 2005 15:29:20 +0000
Subject: [PATCH] Create new image only on resize, set fontMetrics on new
 image

---
 src/jalview/gui/AnnotationPanel.java |   48 ++++++++++++++++++++--------------
 1 file changed, 28 insertions(+), 20 deletions(-)

diff --git a/src/jalview/gui/AnnotationPanel.java b/src/jalview/gui/AnnotationPanel.java
index 4d3fc0f..4f984fd 100755
--- a/src/jalview/gui/AnnotationPanel.java
+++ b/src/jalview/gui/AnnotationPanel.java
@@ -519,29 +519,38 @@ public class AnnotationPanel extends JPanel implements MouseListener,
      */
     public void paintComponent(Graphics g)
     {
-        g.setColor(Color.white);
-        g.fillRect(0, 0, getWidth(), getHeight());
+      g.setColor(Color.white);
+      g.fillRect(0, 0, getWidth(), getHeight());
 
-        if (fastPaint)
-        {
-            g.drawImage(image, 0, 0, this);
-            fastPaint = false;
+      if (fastPaint)
+      {
+        g.drawImage(image, 0, 0, this);
+        fastPaint = false;
+        return;
+      }
 
-            return;
-        }
+      imgWidth = (av.endRes - av.startRes + 1) * av.charWidth;
 
-        imgWidth = (av.endRes - av.startRes + 1) * av.charWidth;
+      if (image != null && imgWidth == image.getWidth())
+      {
+        //This will be called by a mouse over, tool tip etc
+        // no need to redraw whole image
+        g.drawImage(image, 0, 0, this);
+        fastPaint = false;
+        return;
+      }
 
-        image = new BufferedImage(imgWidth, ap.annotationPanel.getHeight(),
-                BufferedImage.TYPE_INT_RGB);
-        gg = (Graphics2D) image.getGraphics();
-        gg.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
-            RenderingHints.VALUE_ANTIALIAS_ON);
+      image = new BufferedImage(imgWidth, ap.annotationPanel.getHeight(),
+                                BufferedImage.TYPE_INT_RGB);
+      gg = (Graphics2D) image.getGraphics();
+      gg.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
+                          RenderingHints.VALUE_ANTIALIAS_ON);
 
-        gg.setFont(av.getFont());
+      gg.setFont(av.getFont());
+      fm = gg.getFontMetrics();
 
-        drawComponent(gg, av.startRes, av.endRes + 1);
-        g.drawImage(image, 0, 0, this);
+      drawComponent(gg, av.startRes, av.endRes + 1);
+      g.drawImage(image, 0, 0, this);
     }
 
     /**
@@ -583,7 +592,9 @@ public class AnnotationPanel extends JPanel implements MouseListener,
         gg.translate(-transX, 0);
 
         fastPaint = true;
+
         repaint();
+
     }
 
     /**
@@ -595,9 +606,6 @@ public class AnnotationPanel extends JPanel implements MouseListener,
      */
     public void drawComponent(Graphics2D g, int startRes, int endRes)
     {
-      if(fm==null)
-        fm = g.getFontMetrics();
-
         g.setColor(Color.white);
         g.fillRect(0, 0, (endRes - startRes) * av.charWidth, getHeight());
 
-- 
1.7.10.2