Can no longer override draw function?

cocos2d-x C++
#1

In Beta 2 the node draw

virtual void draw();

In RC0 it has changed to

virtual void draw() final;

So now to override the draw method I need to override the

virtual void draw(Renderer *renderer, const kmMat4& transform, bool transformUpdated);

method.

Is that right? Am I missing something? It seems a backward step to me? When I just want to override the draw method of a layer and don’t require access to the renderer, transform or transformUpdated arguments, it’d be nice to still be able to do so …

Draw Override nightmare
Draw opengl primitives in Cocos2dx v4
#2

Yep. You are right.
By doing so is to improve performance and remove the dependence of math lib.

#3

@zhangxm
need ur help
i’ve got a problem cocos2dx 2.2.3.
CCLayerColor::initWithColor(ccc4(255,255,255,255));
then i override draw() in helloworld,
and the background turned into black ,
can’t solve.
plz help,thx

#4

@a83988029 My guess is you are not calling the base draw() function from your overrideen function…

#5

@Maxxx let me try as you said

#6

@Maxxx
yes,thanks.

#7

i didnt understand how you override the draw metod in rc0 can you explain it to me? why all those parameters in the method?

#8

@agucabral21
The way I have done it is to override the new virtual draw function with all the parameters, then I have

	_customCommand.init(_globalZOrder);
	_customCommand.func = CC_CALLBACK_0(WorldLayer::drawSubterrains, this);
	renderer->addCommand(&_customCommand);

which adds my drawSubterrains method to the rendering pipeline.

#9

see:

http://www.cocos2d-x.org/docs/manual/framework/native/renderer/en

And:

https://github.com/cocos2d/cocos2d-x/blob/develop/cocos/2d/CCDrawNode.h

Custom openGL drawing in cocos2dx
ccDrawRect always renders behind sprites
#10 
#ifndef __HELLOWORLD_SCENE_H__
#define __HELLOWORLD_SCENE_H__

#include "cocos2d.h"
using namespace cocos2d;
class HelloWorld : public cocos2d::Layer
{
public:
    // there's no 'id' in cpp, so we recommend returning the class instance pointer
    static cocos2d::Scene* createScene();

    // Here's a difference. Method 'init' in cocos2d-x returns bool, instead of returning 'id' in cocos2d-iphone
    virtual bool init();  
    
    // a selector callback
    void menuCloseCallback(cocos2d::Ref* pSender);
    
    // implement the "static create()" method manually
    CREATE_FUNC(HelloWorld);
protected:
	  CustomCommand _customCommand;
	virtual void draw(Renderer *renderer, const kmMat4& transform, bool transformUpdated)
	{
		 _customCommand.init(_globalZOrder+10);
		_customCommand.func = CC_CALLBACK_0(HelloWorld::onDraw, this, transform, transformUpdated);
		renderer->addCommand(&_customCommand);
	}
	virtual void onDraw(const kmMat4 &transform, bool transformUpdated)
	{
		float selfHeight = this->getContentSize().height;
		float selfWidth = this->getContentSize().width;

		cocos2d::Point vertices[4] = {cocos2d::Point(10.f, 10.f), cocos2d::Point(10.f, selfHeight-10), cocos2d::Point(selfWidth-10, selfHeight-10), cocos2d::Point(selfWidth-10, 10.f)};

		cocos2d::DrawPrimitives::drawSolidPoly(vertices, 4, Color4F(0,1,0,1));
	}
private:

	CCTMXTiledMap *_tileMap;
    CCTMXLayer *_background;

};

#endif // __HELLOWORLD_SCENE_H__
Clipping issue migrating from CC2 to CC3
#11

note the initialization of custom command with a z-order higher than that of the the helloworld layer