From 3a455483336b530b45d449270069815a933151d2 Mon Sep 17 00:00:00 2001
From: amwaterhouse <Andrew Waterhouse>
Date: Mon, 30 Jan 2006 14:54:54 +0000
Subject: [PATCH] Fast paint update

---
 src/jalview/gui/AlignmentPanel.java |   39 +++++++++++++++++++----------------
 1 file changed, 21 insertions(+), 18 deletions(-)

diff --git a/src/jalview/gui/AlignmentPanel.java b/src/jalview/gui/AlignmentPanel.java
index 3ebc57c..fdd01d3 100755
--- a/src/jalview/gui/AlignmentPanel.java
+++ b/src/jalview/gui/AlignmentPanel.java
@@ -81,9 +81,7 @@ public class AlignmentPanel extends GAlignmentPanel
     annotationPanel = new AnnotationPanel(this);
     alabels = new AnnotationLabels(this);
 
-    annotationSpaceFillerHolder.setPreferredSize(annotationPanel.
-                                                 getPreferredSize());
-    annotationScroller.setPreferredSize(annotationPanel.getPreferredSize());
+
     annotationScroller.setViewportView(annotationPanel);
     annotationSpaceFillerHolder.add(alabels, BorderLayout.CENTER);
 
@@ -491,28 +489,33 @@ public class AlignmentPanel extends GAlignmentPanel
       overviewPanel.setBoxPosition();
     }
 
-    int xShift = av.getStartRes() - oldX;
-    int yShift = av.getStartSeq() - oldY;
+    int scrollX = av.startRes - oldX;
+    int scrollY = av.startSeq - oldY;
 
-    if ( (xShift != 0 && yShift != 0) ||
-        (Math.abs(xShift) > av.getEndRes() - av.getStartRes()
-         || Math.abs(yShift) > av.getEndSeq() - av.getStartSeq())
-        || av.getWrapAlignment()
-        || !fastPaint)
+    if (av.getWrapAlignment() || !fastPaint)
     {
-      // Either no shift at all, or shift greater than visible amount
       repaint();
     }
     else
     {
-      idPanel.idCanvas.fastPaint(yShift);
-      seqPanel.seqCanvas.fastPaint(xShift, yShift);
-
-      scalePanel.repaint();
-
-      if (av.getShowAnnotation())
+      // Make sure we're not trying to draw a panel
+      // larger than the visible window
+      if(scrollX>av.endRes-av.startRes)
+        scrollX = av.endRes-av.startRes;
+      else if(scrollX<av.startRes-av.endRes)
+        scrollX = av.startRes - av.endRes;
+
+      if(scrollX!=0 || scrollY!=0)
       {
-        annotationPanel.fastPaint(xShift);
+        idPanel.idCanvas.fastPaint(scrollY);
+        seqPanel.seqCanvas.fastPaint(scrollX,
+                                     scrollY);
+        scalePanel.repaint();
+
+        if (av.getShowAnnotation())
+        {
+          annotationPanel.fastPaint(scrollX);
+        }
       }
     }
   }
-- 
1.7.10.2