1) Add "Free OffScreen Buffer" menu item to free the off-screen buffer (by calling setOffScreenBuffer(null)).

2) Free snapshot image resources when scrollable ImageDisplayer window is closed.

3) Free scene graph and off-screen buffer information when application exits

1 files changed, 14 insertions, 3 deletions

diff --git a/src/PrintCanvas3D/ImageDisplayer.java b/src/PrintCanvas3D/ImageDisplayer.java
index 4666bf2..30f498e 100644
--- a/src/PrintCanvas3D/ImageDisplayer.java
+++ b/src/PrintCanvas3D/ImageDisplayer.java
@@ -70,6 +70,12 @@ class ImageDisplayer extends JFrame implements ActionListener {
     private JMenuItem printItem;
     private JMenuItem closeItem;
 
+    private void freeResources() {
+	this.removeAll();
+	this.setVisible(false);
+	bImage = null;
+    }
+
     public void actionPerformed (ActionEvent event) {
 	Object target = event.getSource();
 
@@ -77,9 +83,7 @@ class ImageDisplayer extends JFrame implements ActionListener {
 	    new ImagePrinter(bImage).print();
 	}
 	else if (target == closeItem) {
-	    this.removeAll();
-	    this.setVisible(false);
-	    bImage = null;
+	    freeResources();
 	}
     }
 
@@ -109,6 +113,13 @@ class ImageDisplayer extends JFrame implements ActionListener {
 	JScrollPane scrollPane = new JScrollPane(imagePanel);
 	scrollPane.getViewport().setPreferredSize(new Dimension(700, 700));
 
+	// Handle the close event
+	this.addWindowListener(new WindowAdapter() {
+	    public void windowClosing(WindowEvent winEvent) {
+		freeResources();
+	    }
+	});
+
 	// Add scroll pane to the frame and make it visible
 	this.getContentPane().add(scrollPane);
 	this.pack();