From d1a0432ceea31261f2df4eb728f58ef4d0a30c90 Mon Sep 17 00:00:00 2001
From: kiramt <k.mourao@dundee.ac.uk>
Date: Thu, 3 Aug 2017 08:56:42 +0100
Subject: [PATCH] JAL-2587 Attempt to add timed dissolve

---
 src/jalview/gui/OverviewCanvas.java |   86 ++++++++++++++++++++++++++++++-----
 1 file changed, 74 insertions(+), 12 deletions(-)

diff --git a/src/jalview/gui/OverviewCanvas.java b/src/jalview/gui/OverviewCanvas.java
index 694f804..3bd365e 100644
--- a/src/jalview/gui/OverviewCanvas.java
+++ b/src/jalview/gui/OverviewCanvas.java
@@ -24,15 +24,21 @@ import jalview.api.AlignViewportI;
 import jalview.renderer.OverviewRenderer;
 import jalview.viewmodel.OverviewDimensions;
 
+import java.awt.AlphaComposite;
 import java.awt.Color;
 import java.awt.Dimension;
 import java.awt.Graphics;
+import java.awt.Graphics2D;
+import java.awt.event.ActionEvent;
+import java.awt.event.ActionListener;
 import java.awt.image.BufferedImage;
 
 import javax.swing.JComponent;
+import javax.swing.Timer;
 
 public class OverviewCanvas extends JComponent
 {
+  public static final long RUNNING_TIME = 2000;
   private static final Color TRANS_GREY = new Color(100, 100, 100, 25);
 
   // This is set true if the alignment view changes whilst
@@ -45,6 +51,8 @@ public class OverviewCanvas extends JComponent
 
   private BufferedImage lastMiniMe = null;
 
+  private BufferedImage veryLastMiniMe = null;
+
   // Can set different properties in this seqCanvas than
   // main visible SeqCanvas
   private SequenceRenderer sr;
@@ -59,6 +67,12 @@ public class OverviewCanvas extends JComponent
 
   private boolean resize = false;
 
+  private float alpha = 0f;
+
+  private long startTime = -1;
+
+  private final Timer timer;
+
   public OverviewCanvas(OverviewDimensions overviewDims,
           AlignViewportI alignvp)
   {
@@ -69,6 +83,36 @@ public class OverviewCanvas extends JComponent
     sr.renderGaps = false;
     sr.forOverview = true;
     fr = new jalview.renderer.seqfeatures.FeatureRenderer(av);
+
+    timer = new Timer(40, new ActionListener()
+    {
+
+      @Override
+      public void actionPerformed(ActionEvent e)
+      {
+        if (startTime < 0)
+        {
+          startTime = System.currentTimeMillis();
+        }
+        else
+        {
+
+          long time = System.currentTimeMillis();
+          long duration = time - startTime;
+          if (duration >= RUNNING_TIME)
+          {
+            startTime = -1;
+            ((Timer) e.getSource()).stop();
+            alpha = 0f;
+          }
+          else
+          {
+            alpha = 1f - ((float) duration / (float) RUNNING_TIME);
+          }
+          repaint();
+        }
+      }
+    });
   }
 
   /**
@@ -120,6 +164,7 @@ public class OverviewCanvas extends JComponent
           FeatureRenderer transferRenderer)
   {
     miniMe = null;
+    veryLastMiniMe = lastMiniMe;
 
     if (showSequenceFeatures)
     {
@@ -153,17 +198,11 @@ public class OverviewCanvas extends JComponent
     {
       updaterunning = false;
       lastMiniMe = miniMe;
+      timer.start();
     }
   }
 
   @Override
-  public void setSize(int width, int height)
-  {
-    // TODO Auto-generated method stub
-    super.setSize(width, height);
-  }
-
-  @Override
   public void paintComponent(Graphics g)
   {
 
@@ -199,12 +238,13 @@ public class OverviewCanvas extends JComponent
                   od.getSequencesHeight(), od.getWidth(),
                   od.getGraphHeight());
 
+          // must be done at this point as we rely on using old width/height
+          // above, and new width/height below
           od.setWidth(getWidth());
           od.setHeight(getHeight());
 
           // stick the images back together so lastMiniMe is consistent in the
-          // event
-          // of a repaint - BUT probably not thread safe
+          // event of a repaint - BUT probably not thread safe
           lastMiniMe = new BufferedImage(od.getWidth(), od.getHeight(),
                   BufferedImage.TYPE_INT_RGB);
           Graphics lg = lastMiniMe.getGraphics();
@@ -214,6 +254,11 @@ public class OverviewCanvas extends JComponent
                   od.getWidth(), od.getGraphHeight(), this);
           lg.dispose();
         }
+        else
+        {
+          od.setWidth(getWidth());
+          od.setHeight(getHeight());
+        }
 
         // scale lastMiniMe to the new size
         g.drawImage(lastMiniMe, 0, 0, getWidth(), getHeight(), this);
@@ -224,13 +269,31 @@ public class OverviewCanvas extends JComponent
       }
       else
       {
-        System.out.println("Same size");
-        g.drawImage(lastMiniMe, 0, 0, getWidth(), getHeight(), this);
+
         if (lastMiniMe != miniMe && !resize)
         {
+          g.drawImage(lastMiniMe, 0, 0, getWidth(), getHeight(), this);
           g.setColor(TRANS_GREY);
           g.fillRect(0, 0, getWidth(), getHeight());
         }
+        else if (veryLastMiniMe != null)
+        {
+          Graphics2D g2d = (Graphics2D) g.create();
+          
+          g2d.setComposite(AlphaComposite.SrcOver.derive(alpha));
+          g2d.drawImage(veryLastMiniMe, 0, 0, getWidth(), getHeight(),
+                  this);
+
+          g2d.setComposite(AlphaComposite.SrcOver.derive(1f - alpha));
+          g2d.drawImage(lastMiniMe, 0, 0, getWidth(), getHeight(), this);
+
+          g2d.dispose();
+        }
+        else
+        {
+          // fall back if everything goes wrong somehow
+          g.drawImage(lastMiniMe, 0, 0, getWidth(), getHeight(), this);
+        }
         resize = false;
       }
 
@@ -238,7 +301,6 @@ public class OverviewCanvas extends JComponent
 
     // draw the box
     g.setColor(Color.red);
-
     od.drawBox(g);
   }
 }
-- 
1.7.10.2