2.Cocos2dx 3.2中的重力系统Box2D

1.编写T32.h

#ifndef __T32_H__

#define __T32_H__

#include "cocos2d.h"

USING_NS_CC;

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

#define cclog @H_667_419@cocos2d::log

#endif

2.编写TBack.h

#ifndef __TBack_H__

#define __TBack_H__

#include "T32.h"

class @H_667_419@TBack : public @H_667_419@Layer

{

public:

CREATE_FUNC(@H_667_419@TBack);

bool init();

};

#endif

3编写TBack.cpp

#include "TBack.h"

bool @H_667_419@TBack::init()

{

@H_667_419@Layer::init();

setLocalZOrder(100);

@H_667_419@Menu* menu = @H_667_419@Menu::create();

@H_667_419@MenuItemImage* item = @H_667_419@MenuItemImage::create("Closenormal.png","CloseSelected.png",

[](@H_667_419@Ref*){

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.编写T06Box2D.h

#define __T06Box2D_H__

#include "T32.h"

#include "Box2D/Box2D.h"

class @H_667_419@T06Box2D : public @H_667_419@T06Box2D);

bool init();

@H_667_419@b2World* _world;

@H_667_419@b2Body* _bat;

voID update(float);

};

#endif

5编写：T06Box2D.cpp

#define PTM_RATIO 32.0f

bool @H_667_419@T06Box2D::init();

//创建世界,后面的-9.8表示向下的重力加速度为9.8

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

//这个表示没有重力加速度

@H_667_419@b2Vec2 gravity(0,0.0f);

_world = new @H_667_419@b2World(gravity);

{

@H_667_419@b2BodyDef def;

//这里是一个动态的body，默认是静态的body

def.type = b2_dynamicBody;

//设置位置，要转换成重力场中的位置要除以PTM_RATIO

def.position.@H_667_419@Set(winSize.wIDth / 2 / PTM_RATIO,winSize.height / 2 / PTM_RATIO);

@H_667_419@b2Body* body = _world->CreateBody(&def);

//让body受力

body->SetlinearVeLocity(@H_667_419@b2Vec2(10,20));

//显示body的精灵

@H_667_419@Sprite* sprite = @H_667_419@Sprite::"Closenormal.png");

addChild(sprite);

sprite->setposition(body->Getposition().x*body->Getposition().y*PTM_RATIO);

//设置body的形状，让它和sprite相一致,是圆形的

@H_667_419@b2CircleShape shape;

//设置半径

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

//后面的一个参数表示的是密度系数

@H_667_419@b2Fixture* fixture = body->CreateFixture(&shape,1.0f);

//设置摩擦系统

fixture->SetFriction(0.0f);

//d性系数

fixture->SetRestitution(1.0f);

//关联body和精灵

body->SetUserData(sprite);

}

//加个地板

{

@H_667_419@b2BodyDef def;

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

CreateBody(&def);

//设置边界类型的形状

@H_667_419@b2EdgeShape shape;

//设置地板的开始点和结束点

shape.@H_667_419@Set(@H_667_419@b2Vec2(0,0),@H_667_419@b2Vec2(winSize.wIDth /

//设置摩擦系数

fixture->SetFriction(0.0f);

//设置d性系数

fixture->SetRestitution(1.0f);

}

//加个天花板

{

@H_667_419@b2BodyDef def;

def.position.@H_667_419@Set(0,138); Font-family:新宋体; Font-size:9.5pt">winSize.height / PTM_RATIO);

CreateBody(&def);

@H_667_419@b2EdgeShape shape;

shape.

//摩擦系统

fixture->SetRestitution(1.0f);

}

//左挡板

{

@H_667_419@b2BodyDef def;

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

PTM_RATIO));

fixture->SetFriction(0.0f); //摩擦系统

fixture->SetRestitution(1.0f); //d性系数

}

//右挡板

{

//摩擦系数

fixture->SetRestitution(1.0f);

}

//球拍

{

winSize.height / 4 / CreateBody(&def);

_bat = body;

"bat.png");

body->SetUserData(sprite);

Size batSize = @H_667_419@Size(100,30);

@H_667_419@Size content = sprite->getContentSize();

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

@H_667_419@b2polygonShape shape;

shape.SetAsBox(batSize.wIDth / 2 / batSize.height / 2 /

//摩擦系统

fixture->SetFriction(0.0f);

//d性系统

fixture->SetRestitution(1.0f);

//touch

@H_667_419@EventListenertouchOneByOne* ev = @H_667_419@EventListenertouchOneByOne::create();

ev->ontouchBegan = [](@H_667_419@touch*,133); Font-family:新宋体; Font-size:9.5pt">Event*){return true; };

ev->ontouchmoved = [&](@H_667_419@touch* touch,133); Font-family:新宋体; Font-size:9.5pt">Event*){

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

@H_667_419@b2Vec2 pos = _bat->Getposition();

pos.x += dx;

//下面的函数等价于setposition()

_bat->Settransform(pos,0);

};

_eventdispatcher->addEventListenerWithSceneGraPHPriority(ev,this);

}

scheduleUpdate();

return true;

}

voID update(float dt)

{

//时间在流逝

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

//遍历这个世界的body

GetbodyList();

while (body)

{

//设置body相关的精灵的位置

@H_667_419@Sprite* sprite = (@H_667_419@Sprite*)body->GetUserData();

if (sprite)

{

sprite->PTM_RATIO);

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

}

body = body->GetNext();

}

}

6.编写TMenu.h

#define __TMenu_H__

#include TMenu : public @H_667_419@TMenu);

bool init();

bool touchBegan(@H_667_419@Event*);

};

#endif

7. 编写：TMenu.cpp

#include "TBack.h"

#include "T01CPP11.h"

#include "T02Vector.h"

#include "T03Map.h"

#include "T04Label.h"

#include "T06Box2D.h"

static const char* Title[] = {

"T01CPP11",

"T02Vector",21); Font-family:新宋体; Font-size:9.5pt">"T03Map",21); Font-family:新宋体; Font-size:9.5pt">"T04Label",21); Font-family:新宋体; Font-size:9.5pt">"T06Box2D"

};

bool @H_667_419@TMenu::create();

addChild(menu);

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

{

@H_667_419@MenuItemFont* item = @H_667_419@MenuItemFont::create(Title[i],[](@H_667_419@Ref* sender){

@H_667_419@MenuItem* item = (@H_667_419@MenuItem*)sender;

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

@H_667_419@Layer* l = NulL;

if (Title[i] == "T01CPP11") l = @H_667_419@T01CPP11::create();

if (Title[i] == "T02Vector") l = @H_667_419@T02Vector::"T03Map") l = @H_667_419@T03Map::"T04Label") l = @H_667_419@T04Label::"T06Box2D") l = create();

if (l)

{

@H_667_419@TBack* b = create();

@H_667_419@Scene* s = @H_667_419@Scene::create();

s->addChild(b);

s->addChild(l);

pushScene(s);

}

});

menu->setTag(1000 + i);

}

menu->alignItemsvertically();

// 触摸

auto ev = create();

#if 0

ev->ontouchBegan = [](@H_667_419@Event*){

return true;

};

#endif

//ev->ontouchBegan = std::bind(&TMenu::touchBegan,this,std::placeholders::_1,std::placeholders::_2);

ev->ontouchBegan = CC_CALLBACK_2(touchBegan,this);

ev->ontouchmoved = [&](@H_667_419@Event*){

setpositionY(getpositionY() + touch->getDelta().y);

};

_eventdispatcher->this);

return true;

}

bool touchBegan(/*TMEnu* this,*/@H_667_419@Event*)

{

return true;

}

8.编写AppDelegate.cpp

#include "TBack.h"

USING_NS_CC;

@H_667_419@AppDelegate::@H_667_419@AppDelegate() {

}

@H_667_419@AppDelegate::~@H_667_419@AppDelegate()

{

}

bool @H_667_419@AppDelegate::applicationDIDFinishLaunching() {

// initialize director

auto director = getInstance();

auto glvIEw = director->getopenGLVIEw();

if(!glvIEw) {

glvIEw = @H_667_419@GLVIEw::"My Game");

glvIEw->setFrameSize(480,320);

director->setopenGLVIEw(glvIEw);

}

glvIEw->setDesignResolutionSize(480,320,133); Font-family:新宋体; Font-size:9.5pt">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 = create();

scene->addChild(create());

scene->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 applicationDIDEnterBackground() {

stopAnimation();

// if you use SimpleAudioEngine,it must be pause

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

}

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

voID applicationWillEnterForeground() {

startAnimation();

// if you use SimpleAudioEngine,it must resume here

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

}

运行效果：