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+/*
+ * cocos2d for iPhone: http://www.cocos2d-iphone.org
+ *
+ * Copyright (c) 2009-2010 Ricardo Quesada
+ * Copyright (c) 2011 Zynga Inc.
+ * 
+ * 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 "CCParallaxNode.h"
+#import "Support/CGPointExtension.h"
+#import "Support/ccCArray.h"
+
+@interface CGPointObject : NSObject
+{
+        CGPoint ratio_;
+        CGPoint offset_;
+        CCNode *child_; // weak ref
+}
+@property (readwrite) CGPoint ratio;
+@property (readwrite) CGPoint offset;
+@property (readwrite,assign) CCNode *child;
++(id) pointWithCGPoint:(CGPoint)point offset:(CGPoint)offset;
+-(id) initWithCGPoint:(CGPoint)point offset:(CGPoint)offset;
+@end
+@implementation CGPointObject
+@synthesize ratio = ratio_;
+@synthesize offset = offset_;
+@synthesize child=child_;
+
++(id) pointWithCGPoint:(CGPoint)ratio offset:(CGPoint)offset
+{
+        return [[[self alloc] initWithCGPoint:ratio offset:offset] autorelease];
+}
+-(id) initWithCGPoint:(CGPoint)ratio offset:(CGPoint)offset
+{
+        if( (self=[super init])) {
+                ratio_ = ratio;
+                offset_ = offset;
+        }
+        return self;
+}
+@end
+
+@implementation CCParallaxNode
+
+@synthesize parallaxArray = parallaxArray_;
+
+-(id) init
+{
+        if( (self=[super init]) ) {
+                parallaxArray_ = ccArrayNew(5);         
+                lastPosition = CGPointMake(-100,-100);
+        }
+        return self;
+}
+
+- (void) dealloc
+{
+        if( parallaxArray_ ) {
+                ccArrayFree(parallaxArray_);
+                parallaxArray_ = nil;
+        }
+        [super dealloc];
+}
+
+-(void) addChild:(CCNode*)child z:(NSInteger)z tag:(NSInteger)tag
+{
+        NSAssert(NO,@"ParallaxNode: use addChild:z:parallaxRatio:positionOffset instead");
+}
+
+-(void) addChild: (CCNode*) child z:(NSInteger)z parallaxRatio:(CGPoint)ratio positionOffset:(CGPoint)offset
+{
+        NSAssert( child != nil, @"Argument must be non-nil");
+        CGPointObject *obj = [CGPointObject pointWithCGPoint:ratio offset:offset];
+        obj.child = child;
+        ccArrayAppendObjectWithResize(parallaxArray_, obj);
+        
+        CGPoint pos = self.position;
+        pos.x = pos.x * ratio.x + offset.x;
+        pos.y = pos.y * ratio.y + offset.y;
+        child.position = pos;
+        
+        [super addChild: child z:z tag:child.tag];
+}
+
+-(void) removeChild:(CCNode*)node cleanup:(BOOL)cleanup
+{
+        for( unsigned int i=0;i < parallaxArray_->num;i++) {
+                CGPointObject *point = parallaxArray_->arr[i];
+                if( [point.child isEqual:node] ) {
+                        ccArrayRemoveObjectAtIndex(parallaxArray_, i);
+                        break;
+                }
+        }
+        [super removeChild:node cleanup:cleanup];
+}
+
+-(void) removeAllChildrenWithCleanup:(BOOL)cleanup
+{
+        ccArrayRemoveAllObjects(parallaxArray_);
+        [super removeAllChildrenWithCleanup:cleanup];
+}
+
+-(CGPoint) absolutePosition_
+{
+        CGPoint ret = position_;
+        
+        CCNode *cn = self;
+        
+        while (cn.parent != nil) {
+                cn = cn.parent;
+                ret = ccpAdd( ret,  cn.position );
+        }
+        
+        return ret;
+}
+
+/*
+ The positions are updated at visit because:
+   - using a timer is not guaranteed that it will called after all the positions were updated
+   - overriding "draw" will only precise if the children have a z > 0
+*/
+-(void) visit
+{
+//      CGPoint pos = position_;
+//      CGPoint pos = [self convertToWorldSpace:CGPointZero];
+        CGPoint pos = [self absolutePosition_];
+        if( ! CGPointEqualToPoint(pos, lastPosition) ) {
+                
+                for(unsigned int i=0; i < parallaxArray_->num; i++ ) {
+
+                        CGPointObject *point = parallaxArray_->arr[i];
+                        float x = -pos.x + pos.x * point.ratio.x + point.offset.x;
+                        float y = -pos.y + pos.y * point.ratio.y + point.offset.y;                      
+                        point.child.position = ccp(x,y);
+                }
+                
+                lastPosition = pos;
+        }
+        
+        [super visit];
+}
+@end