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2.Cocos2dx 3.2中的重力系统Box2D

發布時間：2024/9/27 windows 23 豆豆

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1 添加Box2D相關的庫

步驟1：右擊項目所在的解決方案à添加—>現有項目àE:\Installed\cocos2d-x-3.2\cocos2d-x-3.2\external\Box2D\proj.win32\Box2D.vcxproj

步驟2：右擊項目à生成依賴項à項目依賴項à將關于libBox2D的復選框選中

步驟3：為項目添加libBox2D的庫

方法：右擊項目à屬性à鏈接器à輸入—>附加依賴項à編輯，添加上libBox2d.lib，à確定

案例說明：

1.編寫T32.h

#ifndef __T32_H__

#define __T32_H__

#include "cocos2d.h"

USING_NS_CC;

#define winSize Director::getInstance()->getWinSize()

#define CCLog cocos2d::log

#endif

2.編寫TBack.h

#ifndef __TBack_H__

#define __TBack_H__

#include "T32.h"

class TBack : public Layer

{

public:

??? CREATE_FUNC(TBack);

??? bool init();

};

#endif

3編寫TBack.cpp

#include "TBack.h"

bool TBack::init()

{

??? Layer::init();

??? setLocalZOrder(100);

??? Menu* menu = Menu::create();

??? MenuItemImage* item = MenuItemImage::create("CloseNormal.png", "CloseSelected.png",

??????? [](Ref*){

??????? Director::getInstance()->popScene();

??? });

??? menu->addChild(item);

??? item->setPosition(winSize.width / 2 - item->getBoundingBox().size.width / 2,

??????? item->getBoundingBox().size.height / 2 - winSize.height / 2);

??? addChild(menu);

??? return true;

}

4.編寫T06Box2D.h

#ifndef __T06Box2D_H__

#define __T06Box2D_H__

#include "T32.h"

#include "Box2D/Box2D.h"

class T06Box2D : public Layer

{

public:

??? CREATE_FUNC(T06Box2D);

??? bool init();

??? b2World* _world;

??? b2Body* _bat;

??? void update(float);

};

#endif

5編寫：T06Box2D.cpp

#include "T06Box2D.h"

#define PTM_RATIO 32.0f

bool T06Box2D::init()

{

??? Layer::init();

??? //創建世界,后面的-9.8表示向下的重力加速度為9.8

??? //b2Vec2 gravity(0,-9.8f);

??? //這個表示沒有重力加速度

??? b2Vec2 gravity(0,0.0f);

??? _world = new b2World(gravity);

??? {

??????? b2BodyDef def;

??????? //這里是一個動態的body，默認是靜態的body

??????? def.type = b2_dynamicBody;

??????? //設置位置，要轉換成重力場中的位置要除以PTM_RATIO

??????? def.position.Set(winSize.width / 2 / PTM_RATIO, winSize.height / 2 / PTM_RATIO);

???

??????? b2Body* body = _world->CreateBody(&def);

??????? //讓body受力

??????? body->SetLinearVelocity(b2Vec2(10,20));

??????? //顯示body的精靈

??????? Sprite* sprite = Sprite::create("CloseNormal.png");

??????? addChild(sprite);

??????? sprite->setPosition(body->GetPosition().x*PTM_RATIO, body->GetPosition().y*PTM_RATIO);

??????? //設置body的形狀，讓它和sprite相一致,是圓形的

??????? b2CircleShape shape;

??????? //設置半徑

??????? shape.m_radius = sprite->getContentSize().width / 2 / PTM_RATIO;

??????? //后面的一個參數表示的是密度系數

??????? b2Fixture* fixture = body->CreateFixture(&shape, 1.0f);

??????? //設置摩擦系統

??????? fixture->SetFriction(0.0f);

??????? //彈性系數

??????? fixture->SetRestitution(1.0f);

??????? //關聯body和精靈

??????? body->SetUserData(sprite);

??? }

??? //加個地板

??? {

??????? b2BodyDef def;

??????? // def.position.Set(0, 0);

??????? b2Body* body = _world->CreateBody(&def);

??????? //設置邊界類型的形狀

??????? b2EdgeShape shape;

??????? //設置地板的開始點和結束點

??????? shape.Set(b2Vec2(0, 0), b2Vec2(winSize.width / PTM_RATIO, 0));

??????? b2Fixture* fixture = body->CreateFixture(&shape, 1.0f);

??????? //設置摩擦系數

??????? fixture->SetFriction(0.0f);

??????? //設置彈性系數

??????? fixture->SetRestitution(1.0f);

??? }

??? //加個天花板

??? {

??????? b2BodyDef def;

??????? def.position.Set(0, winSize.height / PTM_RATIO);

??????? b2Body* body = _world->CreateBody(&def);

??????? b2EdgeShape shape;

??????? shape.Set(b2Vec2(0, 0), b2Vec2(winSize.width / PTM_RATIO, 0));

??????? b2Fixture* fixture = body->CreateFixture(&shape, 1.0f);

??????? //摩擦系統

??????? fixture->SetFriction(0.0f);

??????? //彈性系數

??????? fixture->SetRestitution(1.0f);

??? }

??? //左擋板

??? {

??????? b2BodyDef def;

??????? //def.position.Set(0, winSize.height / PTM_RATIO);

??????? b2Body* body = _world->CreateBody(&def);

??????? b2EdgeShape shape;

??????? shape.Set(b2Vec2(0, 0), b2Vec2(0, winSize.height / PTM_RATIO));

??????? b2Fixture* fixture = body->CreateFixture(&shape, 1.0f);

??????? fixture->SetFriction(0.0f); //摩擦系統

??????? fixture->SetRestitution(1.0f); //彈性系數

??? }

??? //右擋板

??? {

??????? b2BodyDef def;

??????? def.position.Set(winSize.width / PTM_RATIO, 0);

??????? b2Body* body = _world->CreateBody(&def);

??????? b2EdgeShape shape;

??????? shape.Set(b2Vec2(0, 0), b2Vec2(0, winSize.height / PTM_RATIO));

??????? b2Fixture* fixture = body->CreateFixture(&shape, 1.0f);

??????? //摩擦系數

??????? fixture->SetFriction(0.0f);

??????? //彈性系數

??????? fixture->SetRestitution(1.0f);

??? }

??? //球拍

??? {

??????? b2BodyDef def;

??????? def.position.Set(winSize.width / 2 / PTM_RATIO, winSize.height / 4 / PTM_RATIO);

??????? b2Body* body = _world->CreateBody(&def);

??????? _bat = body;

??????? Sprite* sprite = Sprite::create("bat.png");

??????? body->SetUserData(sprite);

??????? addChild(sprite);

??????? sprite->setPosition(body->GetPosition().x*PTM_RATIO, body->GetPosition().y*PTM_RATIO);

??????? Size batSize = Size(100,30);

??????? Size content = sprite->getContentSize();

??????? sprite->setScale(batSize.width / content.width, batSize.height / content.height);

??????? b2PolygonShape shape;

??????? shape.SetAsBox(batSize.width / 2 / PTM_RATIO, batSize.height / 2 / PTM_RATIO);

??????? b2Fixture* fixture = body->CreateFixture(&shape, 1.0f);

??????? //摩擦系統

??????? fixture->SetFriction(0.0f);

??????? //彈性系統

??????? fixture->SetRestitution(1.0f);

??????? //touch

??????? EventListenerTouchOneByOne* ev = EventListenerTouchOneByOne::create();

??????? ev->onTouchBegan = [](Touch*, Event*){return true; };

??????? ev->onTouchMoved = [&](Touch* touch, Event*){

??????????? float dx = touch->getDelta().x / PTM_RATIO;

??????????? b2Vec2 pos = _bat->GetPosition();

??????????? pos.x += dx;

??????????? //下面的函數等價于setPosition()

??????????? _bat->SetTransform(pos, 0);

??????? };

??????? _eventDispatcher->addEventListenerWithSceneGraphPriority(ev, this);

??? }

??? scheduleUpdate();

??? return true;

}

void T06Box2D::update(float dt)

{

????? //時間在流逝

??? _world->Step(dt, 8, 1);

??? //遍歷這個世界的body

??? b2Body* body = _world->GetBodyList();

??? while (body)

??? {

??? ??? //設置body相關的精靈的位置

??????? Sprite* sprite = (Sprite*)body->GetUserData();

??????? if (sprite)

??????? {

??????????? sprite->setPosition(body->GetPosition().x*PTM_RATIO, body->GetPosition().y*PTM_RATIO);

??????????? sprite->setRotation(body->GetAngle()*180.0 / M_PI);

??????? }

??????? body = body->GetNext();

??? }

}

6.編寫TMenu.h

#ifndef __TMenu_H__

#define __TMenu_H__

#include "T32.h"

class TMenu : public Layer

{

public:

??? CREATE_FUNC(TMenu);

??? bool init();

??? bool TouchBegan(Touch*, Event*);

};

#endif

7. 編寫：TMenu.cpp

#include "TMenu.h"

#include "TBack.h"

#include "T01CPP11.h"

#include "T02Vector.h"

#include "T03Map.h"

#include "T04Label.h"

#include "T06Box2D.h"

static const char* title[] = {

??? "T01CPP11",

??? "T02Vector",

??? "T03Map",

??? "T04Label",

??? "T06Box2D"

};

bool TMenu::init()

{

??? Layer::init();

??? Menu* menu = Menu::create();

??? addChild(menu);

??? for (int i = 0; i < sizeof(title) / sizeof(*title); ++i)

??? {

??????? MenuItemFont* item = MenuItemFont::create(title[i], [](Ref* sender){

??????????? MenuItem* item = (MenuItem*)sender;

??????????? int i = item->getTag()-1000;

??????????? Layer* l = NULL;

??????????? if (title[i] == "T01CPP11")? l = T01CPP11::create();

??????????? if (title[i] == "T02Vector") l = T02Vector::create();

??????????? if (title[i] == "T03Map") l = T03Map::create();

??????????? if (title[i] == "T04Label") l = T04Label::create();

??????????? if (title[i] == "T06Box2D") l = T06Box2D::create();

??????????? if (l)

??????????? {

??????????????? TBack* b = TBack::create();

??????????????? Scene* s = Scene::create();

??????????????? s->addChild(b);

??????????????? s->addChild(l);

??????????????? Director::getInstance()->pushScene(s);

??????????? }

??????? });

??????? menu->addChild(item);

??????? item->setTag(1000 + i);

??? }

??? menu->alignItemsVertically();

??? // 觸摸

??? auto ev = EventListenerTouchOneByOne::create();

#if 0

??? ev->onTouchBegan = [](Touch*, Event*){

??????? return true;

??? };

#endif

??? //ev->onTouchBegan = std::bind(&TMenu::TouchBegan, this, std::placeholders::_1, std::placeholders::_2);

??? ev->onTouchBegan = CC_CALLBACK_2(TMenu::TouchBegan, this);

??? ev->onTouchMoved = [&](Touch* touch, Event*){

??????? setPositionY(getPositionY() + touch->getDelta().y);

??? };

??? _eventDispatcher->addEventListenerWithSceneGraphPriority(ev, this);

??? return true;

}

bool TMenu::TouchBegan(/*TMEnu* this, */Touch*, Event*)

{

??? return true;

}

8.編寫AppDelegate.cpp

#include "AppDelegate.h"

#include "TMenu.h"

#include "TBack.h"

USING_NS_CC;

AppDelegate::AppDelegate() {

}

AppDelegate::~AppDelegate()

{

}

bool AppDelegate::applicationDidFinishLaunching() {

??? // initialize director

??? auto director = Director::getInstance();

??? auto glview = director->getOpenGLView();

??? if(!glview) {

??????? glview = GLView::create("My Game");

??????? glview->setFrameSize(480, 320);

??????? director->setOpenGLView(glview);

??? }

??? glview->setDesignResolutionSize(480, 320, ResolutionPolicy::EXACT_FIT);

??? // turn on display FPS

??? director->setDisplayStats(true);

??? // set FPS. the default value is 1.0/60 if you don't call this

??? director->setAnimationInterval(1.0 / 60);

??? // create a scene. it's an autorelease object

??? auto scene = Scene::create();

??? scene->addChild(TMenu::create());

??? scene->addChild(TBack::create());

??? // run

??? director->runWithScene(scene);

??? return true;

}

// This function will be called when the app is inactive. When comes a phone call,it's be invoked too

void AppDelegate::applicationDidEnterBackground() {

??? Director::getInstance()->stopAnimation();

??? // if you use SimpleAudioEngine, it must be pause

??? // SimpleAudioEngine::getInstance()->pauseBackgroundMusic();

}

// this function will be called when the app is active again

void AppDelegate::applicationWillEnterForeground() {

??? Director::getInstance()->startAnimation();

??? // if you use SimpleAudioEngine, it must resume here

??? // SimpleAudioEngine::getInstance()->resumeBackgroundMusic();

}

運行效果：

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