cocos2dx 3.x(绘制线条)

//

//  MainScene.hpp

//  helloworld

//

//  Created by apple on 16/9/19.

//

//

#ifndef MainScene_hpp

#define MainScene_hpp

#include <stdio.h>

#include "cocos2d.h"

using namespace cocos2d;

//定义一个场景类

class MainScene : public cocos2d::Layer{

private:

// 成员变量(私有的)

cocos2d::Sprite *sprite;//定义一个精灵成员变量

Size size;

public:

virtual bool init(); // 虚函数，返回值为布尔类型，没有函数

static cocos2d::Scene* createScene();//static是一个类方法返回场景

void menuCallback(Ref* pSender);

CREATE_FUNC(MainScene);

//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;

};

#endif /* MainScene_hpp */

//

//  MainScene.cpp

//  helloworld

//

//  Created by apple on 16/9/19.

//

//

#include "MainScene.hpp"

USING_NS_CC;

Scene * MainScene::createScene()

{

auto scene = Scene::create();

//    CCScene * scene = CCScene::create();// 创建场景

//创建层

MainScene *layer = MainScene::create();

scene->addChild(layer);

return scene;

}

bool MainScene::init(){

if (!Layer::init()) {

return false;

}

//获取屏幕大小

size = Director::getInstance()->getVisibleSize();

//auto size = Director::getInstance()->getWinSize();

return true;

}

void MainScene::draw(Renderer *renderer, const Mat4 &transform, uint32_t flags)

{

_customCommand.init(_globalZOrder);

_customCommand.func = CC_CALLBACK_0(MainScene::onDraw, this, transform, flags);

renderer->addCommand(&_customCommand);

}

void MainScene::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 MainScene::menuCallback(Ref* pSender)

{

}