#include "cocos2d.h"

USING_NS_CC;

class GameScene : public cocos2d::Layer
{
public:
    static cocos2d::Scene* createScene();
    
    virtual bool init();
    
    void menuCallback(Ref* pSender);
    
    CREATE_FUNC(GameScene);
    
    //重载draw方法
    virtual void draw(Renderer *renderer, const Mat4 &transform, uint32_t flags) override;
    
protected:
    //自定义draw实现
    void onDraw(const cocos2d::Mat4 &transform, bool transformUpdated);
    cocos2d::CustomCommand _customCommand;
    
private:        //注意不能用auto关键字
    Size size;
    Sprite *sprite;
};

//  Created by Jacedy on 14-8-11.

#include "GameScene.h"

USING_NS_CC;

cocos2d::Scene* GameScene::createScene()
{
    auto scene = Scene::create();   //创建一个场景
    auto layer = GameScene::create();   //创建一个图层
    scene->addChild(layer);
    return scene;
}

//初始化当前的图层
bool GameScene::init()
{
    if(!Layer::init())      //初始化父类
        return false;
    
    //获取屏幕大小
    size = Director::getInstance()->getVisibleSize();
    //auto size = Director::getInstance()->getWinSize();
    
    
    return true;
}

void GameScene::draw(Renderer *renderer, const Mat4 &transform, uint32_t flags)
{
    _customCommand.init(_globalZOrder);
    _customCommand.func = CC_CALLBACK_0(GameScene::onDraw, this, transform, flags);
    renderer->addCommand(&_customCommand);
}

void GameScene::onDraw(const cocos2d::Mat4 &transform, bool transformUpdated)
{
    //利用Stack缓存
    Director *director = Director::getInstance();
    //CCASSERT(nullptr != director, "Director is null when setting matrix stack");
    director->pushMatrix(MATRIX_STACK_TYPE::MATRIX_STACK_MODELVIEW);
    director->loadMatrix(MATRIX_STACK_TYPE::MATRIX_STACK_MODELVIEW, transform);
    
    CHECK_GL_ERROR_DEBUG();
    
    //画边框
    DrawPrimitives::setDrawColor4B(255, 255, 255, 255);
    glLineWidth(10);
    Vec2 vertices[] = {Vec2(100, 100), Vec2(300, 100), Vec2(300, 300), Vec2(100, 300)};
    DrawPrimitives::drawPoly(vertices, 4, true);
    
    CHECK_GL_ERROR_DEBUG();
    
    //绘制停止，释放
    director->popMatrix(MATRIX_STACK_TYPE::MATRIX_STACK_MODELVIEW);
}

void GameScene::menuCallback(Ref* pSender)
{
    
}

Cocos2d-x3.2 绘制线条