diff -r a59acc683080 -r 4585c74d809c Source/Piece.m
--- a/Source/Piece.m	Thu May 29 15:04:06 2008 -0700
+++ b/Source/Piece.m	Tue Jul 08 20:32:52 2008 -0700
@@ -27,13 +27,23 @@
 @implementation Piece
 
 
+- (id) init
+{
+    self = [super init];
+    if (self != nil) {
+        self.zPosition = kPieceZ;
+    }
+    return self;
+}
+
+
+
 - (id) initWithImageNamed: (NSString*)imageName
                     scale: (CGFloat)scale
 {
-    self = [super init];
+    self = [self init];
     if (self != nil) {
         [self setImageNamed: imageName scale: scale];
-        self.zPosition = kPieceZ;
     }
     return self;
 }
@@ -124,4 +134,29 @@
 }
 
 
+#if ! TARGET_OS_IPHONE
+
+// An image from another app can be dragged onto a Piece to change its background pattern.
+
+- (NSDragOperation)draggingEntered:(id <NSDraggingInfo>)sender
+{
+    if( CanGetCGImageFromPasteboard([sender draggingPasteboard]) )
+        return NSDragOperationCopy;
+    else
+        return NSDragOperationNone;
+}
+
+- (BOOL)performDragOperation:(id <NSDraggingInfo>)sender
+{
+    CGImageRef image = GetCGImageFromPasteboard([sender draggingPasteboard],sender);
+    if( image ) {
+        [self setValue: (id)image ofStyleProperty: @"contents"];
+        return YES;
+    } else
+        return NO;
+}
+
+#endif
+
+
 @end