axmol/cocos/2d/CCParallaxNode.cpp

/****************************************************************************
Copyright (c) 2010-2012 cocos2d-x.org
Copyright (c) 2009-2010 Ricardo Quesada
Copyright (c) 2011      Zynga Inc.

http://www.cocos2d-x.org

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.
****************************************************************************/
#include "CCParallaxNode.h"
#include "ccCArray.h"

NS_CC_BEGIN

class PointObject : Object
{
public:
    static PointObject * create(Point ratio, Point offset)
    {
        PointObject *pRet = new PointObject();
        pRet->initWithPoint(ratio, offset);
        pRet->autorelease();
        return pRet;
    }
    
    bool initWithPoint(Point ratio, Point offset)
    {
        _ratio = ratio;
        _offset = offset;
        _child = NULL;
        return true;
    }
    
    inline const Point& getRatio() const { return _ratio; };
    inline void setRatio(const Point& ratio) { _ratio = ratio; };

    inline const Point& getOffset() const { return _offset; };
    inline void setOffset(const Point& offset) { _offset = offset; };
    
    inline Node* getChild() const { return _child; };
    inline void setChild(Node* child) { _child = child; };
    
private:
    Point _ratio;
    Point _offset;
    Node *_child; // weak ref
};

ParallaxNode::ParallaxNode()
{
    _parallaxArray = ccArrayNew(5);        
    _lastPosition = Point(-100,-100);
}

ParallaxNode::~ParallaxNode()
{
    if( _parallaxArray )
    {
        ccArrayFree(_parallaxArray);
        _parallaxArray = NULL;
    }
}

ParallaxNode * ParallaxNode::create()
{
    ParallaxNode *pRet = new ParallaxNode();
    pRet->autorelease();
    return pRet;
}

void ParallaxNode::addChild(Node * child, int zOrder, int tag)
{
    CC_UNUSED_PARAM(zOrder);
    CC_UNUSED_PARAM(child);
    CC_UNUSED_PARAM(tag);
    CCASSERT(0,"ParallaxNode: use addChild:z:parallaxRatio:positionOffset instead");
}

void ParallaxNode::addChild(Node *child, int z, const Point& ratio, const Point& offset)
{
    CCASSERT( child != NULL, "Argument must be non-nil");
    PointObject *obj = PointObject::create(ratio, offset);
    obj->setChild(child);
    ccArrayAppendObjectWithResize(_parallaxArray, (Object*)obj);

    Point pos = _position;
    pos.x = pos.x * ratio.x + offset.x;
    pos.y = pos.y * ratio.y + offset.y;
    child->setPosition(pos);

    Node::addChild(child, z, child->getTag());
}
void ParallaxNode::removeChild(Node* child, bool cleanup)
{
    for( int i=0;i < _parallaxArray->num;i++)
    {
        PointObject *point = (PointObject*)_parallaxArray->arr[i];
        if( point->getChild()->isEqual(child)) 
        {
            ccArrayRemoveObjectAtIndex(_parallaxArray, i, true);
            break;
        }
    }
    Node::removeChild(child, cleanup);
}
void ParallaxNode::removeAllChildrenWithCleanup(bool cleanup)
{
    ccArrayRemoveAllObjects(_parallaxArray);
    Node::removeAllChildrenWithCleanup(cleanup);
}
Point ParallaxNode::absolutePosition()
{
    Point ret = _position;
    Node *cn = this;
    while (cn->getParent() != NULL)
    {
        cn = cn->getParent();
        ret = ret + cn->getPosition();
    }
    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 ParallaxNode::visit()
{
    //    Point pos = position_;
    //    Point    pos = [self convertToWorldSpace:Point::ZERO];
    Point pos = this->absolutePosition();
    if( ! pos.equals(_lastPosition) )
    {
        for( int i=0; i < _parallaxArray->num; i++ ) 
        {
            PointObject *point = (PointObject*)_parallaxArray->arr[i];
            float x = -pos.x + pos.x * point->getRatio().x + point->getOffset().x;
            float y = -pos.y + pos.y * point->getRatio().y + point->getOffset().y;            
            point->getChild()->setPosition(Point(x,y));
        }
        _lastPosition = pos;
    }
    Node::visit();
}

NS_CC_END