Initial commit (version 0.2.1)

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+/*
+ * cocos2d for iPhone: http://www.cocos2d-iphone.org
+ *
+ * Copyright 2009 lhunath (Maarten Billemont)
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ * 
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *
+ */
+
+#import "CCActionTween.h"
+
+
+@implementation CCActionTween
+
++ (id)actionWithDuration:(ccTime)aDuration key:(NSString *)aKey from:(float)aFrom to:(float)aTo {
+
+        return [[[[self class] alloc] initWithDuration:aDuration key:aKey from:aFrom to:aTo] autorelease];
+}
+
+- (id)initWithDuration:(ccTime)aDuration key:(NSString *)key from:(float)from to:(float)to {
+    
+        if ((self = [super initWithDuration:aDuration])) {
+    
+                key_    = [key copy];
+                to_             = to;
+                from_   = from;
+
+        }
+    
+        return self;
+}
+
+- (void) dealloc
+{
+        [key_ release];
+        [super dealloc];
+}
+
+- (void)startWithTarget:aTarget
+{
+        [super startWithTarget:aTarget];
+        delta_ = to_ - from_;
+}
+
+- (void) update:(ccTime) dt
+{    
+        [target_ setValue:[NSNumber numberWithFloat:to_  - delta_ * (1 - dt)] forKey:key_];
+}
+
+- (CCActionInterval *) reverse
+{
+        return [[self class] actionWithDuration:duration_ key:key_ from:to_ to:from_];
+}
+
+
+@end