axmol/cocos2dx/include/CCNode.h

/****************************************************************************
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#ifndef __CCNODE_H__
#define __CCNODE_H__

#include "Cocos2dDefine.h"
#include "ccMacros.h"
#include "CCScheduler.h"
#include "CGAffineTransform.h"
#include "NSMutableArray.h"
#include "ccConfig.h"
#include "ccxCommon.h"

namespace   cocos2d {
class CCCamera;
class CCGridBase;
class CGPoint;
class CCTouch;
class CCAction;

enum {
	kCCNodeTagInvalid = -1,
};

/** CCNode is the main element. Anything thats gets drawn or contains things that get drawn is a CCNode.
The most popular CCNodes are: CCScene, CCLayer, CCSprite, CCMenu.

The main features of a CCNode are:
- They can contain other CCNode nodes (addChild, getChildByTag, removeChild, etc)
- They can schedule periodic callback (schedule, unschedule, etc)
- They can execute actions (runAction, stopAction, etc)

Some CCNode nodes provide extra functionality for them or their children.

Subclassing a CCNode usually means (one/all) of:
- overriding init to initialize resources and schedule callbacks
- create callbacks to handle the advancement of time
- overriding draw to render the node

Features of CCNode:
- position
- scale (x, y)
- rotation (in degrees, clockwise)
- CCCamera (an interface to gluLookAt )
- CCGridBase (to do mesh transformations)
- anchor point
- size
- visible
- z-order
- openGL z position

Default values:
- rotation: 0
- position: (x=0,y=0)
- scale: (x=1,y=1)
- contentSize: (x=0,y=0)
- anchorPoint: (x=0,y=0)

Limitations:
- A CCNode is a "void" object. It doesn't have a texture

Order in transformations with grid disabled
-# The node will be translated (position)
-# The node will be rotated (rotation)
-# The node will be scaled (scale)
-# The node will be moved according to the camera values (camera)

Order in transformations with grid enabled
-# The node will be translated (position)
-# The node will be rotated (rotation)
-# The node will be scaled (scale)
-# The grid will capture the screen
-# The node will be moved according to the camera values (camera)
-# The grid will render the captured screen

Camera:
- Each node has a camera. By default it points to the center of the CCNode.
*/ 

class CCX_DLL CCNode : public SelectorProtocol, public NSObject
{

	// variable property

	/** The z order of the node relative to it's "brothers": children of the same parent */
	CCX_PROPERTY_READONLY(int, m_nZOrder, ZOrder)

	/** The real openGL Z vertex.
	Differences between openGL Z vertex and cocos2d Z order:
	- OpenGL Z modifies the Z vertex, and not the Z order in the relation between parent-children
	- OpenGL Z might require to set 2D projection
	- cocos2d Z order works OK if all the nodes uses the same openGL Z vertex. eg: vertexZ = 0
	@warning: Use it at your own risk since it might break the cocos2d parent-children z order
	@since v0.8
	*/
	CCX_PROPERTY(float, m_fVertexZ, VertexZ)

	/** The rotation (angle) of the node in degrees. 0 is the default rotation angle. Positive values rotate node CW. */
	CCX_PROPERTY(float, m_fRotation, Rotation)

	/** The scale factor of the node. 1.0 is the default scale factor. It modifies the X and Y scale at the same time. */
	float getScale();
	void setScale(float scale);

	/** The scale factor of the node. 1.0 is the default scale factor. It only modifies the X scale factor. */
	CCX_PROPERTY(float, m_fScaleX, ScaleX)

	/** The scale factor of the node. 1.0 is the default scale factor. It only modifies the Y scale factor. */
	CCX_PROPERTY(float, m_fScaleY, ScaleY)

	/** Position (x,y) of the node in OpenGL coordinates. (0,0) is the left-bottom corner. */
	CCX_PROPERTY(CGPoint, m_tPosition, Position)

	CCX_PROPERTY_READONLY(NSMutableArray<CCNode *> *, m_pChildren, Children)

	/** A CCCamera object that lets you move the node using a gluLookAt
	*/
	CCX_PROPERTY_READONLY(CCCamera *, m_pCamera, Camera)

	/** A CCGrid object that is used when applying effects */
	CCX_PROPERTY(CCGridBase *, m_pGrid, Grid)

	/** Whether of not the node is visible. Default is true */
	CCX_PROPERTY(bool, m_bIsVisible, IsVisible)

	/** anchorPoint is the point around which all transformations and positioning manipulations take place.
	It's like a pin in the node where it is "attached" to its parent.
	The anchorPoint is normalized, like a percentage. (0,0) means the bottom-left corner and (1,1) means the top-right corner.
	But you can use values higher than (1,1) and lower than (0,0) too.
	The default anchorPoint is (0.5,0.5), so it starts in the center of the node.
	@since v0.8
	*/
	CCX_PROPERTY(CGPoint, m_tAnchorPoint, AnchorPoint)

	/** The anchorPoint in absolute pixels.
	Since v0.8 you can only read it. If you wish to modify it, use anchorPoint instead
	*/
	CCX_PROPERTY_READONLY(CGPoint, m_tAnchorPointInPixels, AnchorPointInPixels)
	
	/** The untransformed size of the node.
	The contentSize remains the same no matter the node is scaled or rotated.
	All nodes has a size. Layer and Scene has the same size of the screen.
	@since v0.8
	*/
	CCX_PROPERTY(CGSize, m_tContentSize, ContentSize)

	/** whether or not the node is running */
	CCX_PROPERTY_READONLY(bool, m_bIsRunning, IsRunning)

	/** A weak reference to the parent */
	CCX_PROPERTY(CCNode *, m_pParent, Parent)

	/** If true the transformtions will be relative to it's anchor point.
	* Sprites, Labels and any other sizeble object use it have it enabled by default.
	* Scenes, Layers and other "whole screen" object don't use it, have it disabled by default.
	*/
	CCX_PROPERTY(bool, m_bIsRelativeAnchorPoint, IsRelativeAnchorPoint)

	/** A tag used to identify the node easily */
	CCX_PROPERTY(int, m_nTag, Tag)

	/** A custom user data pointer */
	CCX_PROPERTY(void *, m_pUserData, UserData)
	
protected:

	// transform
	CGAffineTransform m_tTransform, m_tInverse;

#ifdef	CC_NODE_TRANSFORM_USING_AFFINE_MATRIX
	GLfloat	m_pTransformGL[16];
#endif
	// To reduce memory, place bools that are not properties here:
	bool m_bIsTransformDirty;
	bool m_bIsInverseDirty;

#ifdef	CC_NODE_TRANSFORM_USING_AFFINE_MATRIX
	bool m_bIsTransformGLDirty;
#endif
    
private:

	// lazy allocs
	void childrenAlloc(void);

	// helper that reorder a child
	void insertChild(CCNode* child, int z);

	// used internally to alter the zOrder variable. DON'T call this method manually
	void setZOrder(int z);

	void detachChild(CCNode *child, bool doCleanup);

	typedef void (CCNode::*callbackFunc)(void);

	void arrayMakeObjectsPerformSelector(NSMutableArray<CCNode*> * pArray, callbackFunc func);

	CGPoint convertToWindowSpace(CGPoint nodePoint);


public:

	CCNode();

	virtual ~CCNode();

	char * description(void);

	/** allocates and initializes a node.
	The node will be created as "autorelease".
	*/
	static CCNode * node(void);

	//scene managment

	/** callback that is called every time the CCNode enters the 'stage'.
	If the CCNode enters the 'stage' with a transition, this callback is called when the transition starts.
	During onEnter you can't a "sister/brother" node.
	*/
	virtual void onEnter();

	/** callback that is called when the CCNode enters in the 'stage'.
	If the CCNode enters the 'stage' with a transition, this callback is called when the transition finishes.
	@since v0.8
	*/
	virtual void onEnterTransitionDidFinish();

	/** callback that is called every time the CCNode leaves the 'stage'.
	If the CCNode leaves the 'stage' with a transition, this callback is called when the transition finishes.
	During onExit you can't a "sister/brother" node.
	*/
	virtual void onExit();

	// composition: ADD

	/** Adds a child to the container with z-order as 0.
	It returns self, so you can chain several addChilds.
	@since v0.7.1
	*/
	virtual CCNode * addChild(CCNode * child);

	/** Adds a child to the container with a z-order
	It returns self, so you can chain several addChilds.
	@since v0.7.1
	*/
	virtual CCNode * addChild(CCNode * child, int zOrder);

	/** Adds a child to the container with z order and tag
	It returns self, so you can chain several addChilds.
	@since v0.7.1
	*/
	virtual CCNode * addChild(CCNode * child, int zOrder, int tag);

	// composition: REMOVE

	/** Remove itself from its parent node. If cleanup is true, then also remove all actions and callbacks.
	If the node orphan, then nothing happens.
	@since v0.99.3
	*/
	void removeFromParentAndCleanup(bool cleanup);

	/** Removes a child from the container. It will also cleanup all running actions depending on the cleanup parameter.
	@since v0.7.1
	*/
	virtual void removeChild(CCNode* child, bool cleanup);

	/** Removes a child from the container by tag value. It will also cleanup all running actions depending on the cleanup parameter
	@since v0.7.1
	*/
	void removeChildByTag(int tag, bool cleanup);

	/** Removes all children from the container and do a cleanup all running actions depending on the cleanup parameter.
	@since v0.7.1
	*/
	virtual void removeAllChildrenWithCleanup(bool cleanup);

	// composition: GET
	/** Gets a child from the container given its tag
	@return returns a CCNode object
	@since v0.7.1
	*/
	CCNode * getChildByTag(int tag);

	/** Reorders a child according to a new z value.
	* The child MUST be already added.
	*/
	virtual void reorderChild(CCNode * child, int zOrder);

	/** Stops all running actions and schedulers
	@since v0.8
	*/
	virtual void cleanup(void);

	// draw

	/** Override this method to draw your own node.
	The following GL states will be enabled by default:
	- glEnableClientState(GL_VERTEX_ARRAY);
	- glEnableClientState(GL_COLOR_ARRAY);
	- glEnableClientState(GL_TEXTURE_COORD_ARRAY);
	- glEnable(GL_TEXTURE_2D);

	AND YOU SHOULD NOT DISABLE THEM AFTER DRAWING YOUR NODE

	But if you enable any other GL state, you should disable it after drawing your node.
	*/
	virtual void draw(void);

	/** recursive method that visit its children and draw them */
	virtual void visit(void);

	// transformations

	/** performs OpenGL view-matrix transformation based on position, scale, rotation and other attributes. */
	void transform(void);

	/** performs OpenGL view-matrix transformation of it's ancestors.
	Generally the ancestors are already transformed, but in certain cases (eg: attaching a FBO)
	it's necessary to transform the ancestors again.
	@since v0.7.2
	*/
	void transformAncestors(void);

	/** returns a "local" axis aligned bounding box of the node.
	The returned box is relative only to its parent.

	@since v0.8.2
	*/
	CGRect boundingBox(void);

	// actions

	/** Executes an action, and returns the action that is executed.
	The node becomes the action's target.
	@warning Starting from v0.8 actions don't retain their target anymore.
	@since v0.7.1
	@return An Action pointer
	*/
	
	CCAction* runAction(CCAction* action);

	/** Removes all actions from the running action list */
	void stopAllActions(void);

	/** Removes an action from the running action list */
	void stopAction(CCAction* action);

	/** Removes an action from the running action list given its tag
	@since v0.7.1
	*/
	void stopActionByTag(int tag);

	/** Gets an action from the running action list given its tag
	@since v0.7.1
	@return the Action the with the given tag
	*/
	CCAction* getActionByTag(int tag);

	/** Returns the numbers of actions that are running plus the ones that are schedule to run (actions in actionsToAdd and actions arrays). 
	* Composable actions are counted as 1 action. Example:
	*    If you are running 1 Sequence of 7 actions, it will return 1.
	*    If you are running 7 Sequences of 2 actions, it will return 7.
	*/
	int numberOfRunningActions(void);


	// timers

	/** check whether a selector is scheduled. */
	bool isScheduled(SEL_SCHEDULE selector);

	/** schedules the "update" method. It will use the order number 0. This method will be called every frame.
	Scheduled methods with a lower order value will be called before the ones that have a higher order value.
	Only one "update" method could be scheduled per node.

	@since v0.99.3
	*/
	void scheduleUpdate(void);

	/** schedules the "update" selector with a custom priority. This selector will be called every frame.
	Scheduled selectors with a lower priority will be called before the ones that have a higher value.
	Only one "update" selector could be scheduled per node (You can't have 2 'update' selectors).

	@since v0.99.3
	*/
	void scheduleUpdateWithPriority(int priority);

	/* unschedules the "update" method.

	@since v0.99.3
	*/
	void unscheduleUpdate(void);

	/** schedules a selector.
	The scheduled selector will be ticked every frame
	*/
	void schedule(SEL_SCHEDULE selector);

	/** schedules a custom selector with an interval time in seconds.
	If time is 0 it will be ticked every frame.
	If time is 0, it is recommended to use 'scheduleUpdate' instead.
	*/
	void schedule(SEL_SCHEDULE selector, ccTime interval);

	/** unschedules a custom selector.*/
	void unschedule(SEL_SCHEDULE selector);

	/** unschedule all scheduled selectors: custom selectors, and the 'update' selector.
	Actions are not affected by this method.
	@since v0.99.3
	*/
	void unscheduleAllSelectors(void);

	/** resumes all scheduled selectors and actions.
	Called internally by onEnter
	*/
	void resumeSchedulerAndActions(void);
	/** pauses all scheduled selectors and actions.
	Called internally by onExit
	*/
	void pauseSchedulerAndActions(void);


	// transformation methods

	/** Returns the local affine transform matrix
	@since v0.7.1
	*/
	CGAffineTransform nodeToParentTransform(void);

	/** Returns the inverse local affine transform matrix
	@since v0.7.1
	*/
	CGAffineTransform parentToNodeTransform(void);

	/** Retrusn the world affine transform matrix
	@since v0.7.1
	*/
	CGAffineTransform nodeToWorldTransform(void);

	/** Returns the inverse world affine transform matrix
	@since v0.7.1
	*/
	CGAffineTransform worldToNodeTransform(void);

	/** converts a world coordinate to local coordinate
	@since v0.7.1
	*/
	CGPoint convertToNodeSpace(CGPoint worldPoint);
	/** converts local coordinate to world space
	@since v0.7.1
	*/
	CGPoint convertToWorldSpace(CGPoint nodePoint);
	/** converts a world coordinate to local coordinate
	treating the returned/received node point as anchor relative
	@since v0.7.1
	*/
	CGPoint convertToNodeSpaceAR(CGPoint worldPoint);
	/** converts local coordinate to world space
	treating the returned/received node point as anchor relative
	@since v0.7.1
	*/
	CGPoint convertToWorldSpaceAR(CGPoint nodePoint);
	/** convenience methods which take a CCTouch instead of CGPoint
	@since v0.7.1
	*/
	CGPoint convertTouchToNodeSpace(CCTouch * touch);

	/** converts a CCTouch (world coordinates) into a local coordiante. This method is AR (Anchor Relative).
	@since v0.7.1
	*/
	CGPoint convertTouchToNodeSpaceAR(CCTouch * touch);

};
}//namespace   cocos2d 

#endif // __CCNODE_H__