better text overlay for setting/recalling bookmarks

core/src/main/java/bdv/tools/bookmarks/BookmarkEditor.java

@@ -31,6 +31,8 @@ public class BookmarkEditor
 
 	private final HashMap< String, AffineTransform3D > bookmarks;
 
+	private BookmarkTextOverlayAnimator animator;
+
 	public BookmarkEditor( final ViewerPanel viewer, final InputActionBindings inputActionBindings )
 	{
 		this.viewer = viewer;
@@ -67,14 +69,15 @@ public class BookmarkEditor
 						final AffineTransform3D t = new AffineTransform3D();
 						viewer.getState().getViewerTransform( t );
 						bookmarks.put( key, t );
-						viewer.showMessage( "set bookmark " + key );
+						animator.fadeOut( "set bookmark: " + key, 500 );
+						viewer.requestRepaint();
 					}
 					else
 					{
 						final AffineTransform3D t = bookmarks.get( key );
 						if ( t != null )
 							viewer.setCurrentViewerTransform( t );
-						viewer.showMessage( "go to bookmark " + key );
+						animator.fadeOut( "go to bookmark: " + key, 500 );
 					}
 					done();
 				}
@@ -84,19 +87,22 @@ public class BookmarkEditor
 
 	public synchronized void abort()
 	{
+		if ( animator != null )
+			animator.clear();
 		if ( active )
-		{
-			viewer.showMessage( "aborted" );
 			done();
 	}
-	}
 
 	public synchronized void initSetBookmark()
 	{
 		active = true;
 		setBookmark = true;
 		bindings.addInputMap( "bookmarks", inputMap, "bdv", "navigation" );
-		viewer.showMessage( " bookmark" );
+		if ( animator != null )
+			animator.clear();
+		animator = new BookmarkTextOverlayAnimator( viewer );
+		viewer.addOverlayAnimator( animator );
+		animator.fadeIn( "set bookmark: ", 100 );
 	}
 
 	public synchronized void initGoToBookmark()
@@ -104,7 +110,11 @@ public class BookmarkEditor
 		active = true;
 		setBookmark = false;
 		bindings.addInputMap( "bookmarks", inputMap, "bdv", "navigation" );
-		viewer.showMessage( "go to bookmark" );
+		if ( animator != null )
+			animator.clear();
+		animator = new BookmarkTextOverlayAnimator( viewer );
+		viewer.addOverlayAnimator( animator );
+		animator.fadeIn( "go to bookmark: ", 100 );
 	}
 
 	public synchronized void done()

core/src/main/java/bdv/tools/bookmarks/BookmarkTextOverlayAnimator.java

+package bdv.tools.bookmarks;
+
+import java.awt.Color;
+import java.awt.Font;
+import java.awt.Graphics2D;
+import java.awt.font.FontRenderContext;
+import java.awt.font.TextLayout;
+import java.awt.geom.Rectangle2D;
+
+import bdv.viewer.ViewerPanel;
+import bdv.viewer.animate.AbstractAnimator;
+import bdv.viewer.animate.OverlayAnimator;
+
+/**
+ * Draw one line of text in the center or bottom right of the display. Text is
+ * fading in and out.
+ *
+ * @author Tobias Pietzsch <tobias.pietzsch@gmail.com>
+ */
+public class BookmarkTextOverlayAnimator implements OverlayAnimator
+{
+	private final Font font;
+
+	private String text;
+
+	private AbstractAnimator animator;
+
+	private boolean fadeIn;
+
+	private boolean complete = false;
+
+	private final ViewerPanel viewer;
+
+	public BookmarkTextOverlayAnimator( final ViewerPanel viewer )
+	{
+		this( viewer, new Font( "SansSerif", Font.BOLD, 20 ) );
+	}
+
+	public BookmarkTextOverlayAnimator( final ViewerPanel viewer, final Font font )
+	{
+		this.viewer = viewer;
+		this.font = font;
+	}
+
+	public final void fadeIn( final String message, final long fadeInDuration )
+	{
+		text = message;
+		animator = ( fadeInDuration > 0 ) ? new AbstractAnimator( fadeInDuration ) : null;
+		fadeIn = true;
+		viewer.getDisplay().repaint();
+	}
+
+	public final void fadeOut( final String message, final long fadeOutDuration )
+	{
+		text = message;
+		animator = new AbstractAnimator( fadeOutDuration );
+		fadeIn = false;
+		viewer.getDisplay().repaint();
+	}
+
+	public final void clear()
+	{
+		text = null;
+		animator = null;
+		complete = true;
+		viewer.getDisplay().repaint();
+	}
+
+	@Override
+	public void paint( final Graphics2D g, final long time )
+	{
+		if ( text == null )
+			return;
+
+		final FontRenderContext frc = g.getFontRenderContext();
+		final TextLayout layout = new TextLayout( text, font, frc );
+		final Rectangle2D bounds = layout.getBounds();
+		final float x, y;
+		x = ( float ) ( g.getClipBounds().getWidth() - bounds.getWidth() - 10 );
+		y = ( float ) ( g.getClipBounds().getHeight() - 10 );
+
+		final float alpha;
+		if ( animator != null )
+		{
+			animator.setTime( time );
+			final double t = animator.ratioComplete();
+			if ( fadeIn )
+				alpha = ( float ) Math.sin( ( Math.PI / 2 ) * t );
+			else
+				alpha = ( float ) Math.sin( ( Math.PI / 2 ) * ( 1.0 - t ) );
+
+			if ( animator.isComplete() )
+			{
+				animator = null;
+				if ( ! fadeIn )
+					complete = true;
+			}
+		}
+		else
+			alpha = 1;
+
+		g.setColor( new Color( 1f, 1f, 1f, alpha ) );
+		layout.draw( g, x, y );
+	}
+
+	@Override
+	public boolean isComplete()
+	{
+		return complete;
+	}
+
+	@Override
+	public boolean requiresRepaint()
+	{
+		return ! ( animator == null || text == null );
+	}
+}