【麦可网】Cocos2d-X跨平台游戏开发---学习笔记
第二十六课：Cocos2D-X物理引擎之Box2D11-12
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课程目标：
-学习chipmunk
课程重点：
-chipmuk概念
-chipmuk与Box2D
-chipmunk常用操作
考核目标：
-能够使用chipmuk常用操作，完成游戏需求
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一、chipmuk与Box2D对比
二、实例
HelloChipmunk.h
--------------------------------------------
#pragma once
#include "cocos2d.h"
#include "cocos-ext.h"
#include "chipmunk.h"
using namespace cocos2d::extension;
using namespace cocos2d;
class HelloChipmunk : public cocos2d::CCLayer
{
public:
HelloChipmunk();
~HelloChipmunk();
// Here's a difference. Method 'init' in cocos2d-x returns bool,instead of returning 'id' in cocos2d-iphone
virtual bool init();
// there's no 'id' in cpp,so we recommend returning the class instance pointer
static cocos2d::CCScene* scene();
// a selector callback
void menuCallback(CCObject* pSender);
// implement the "static node()" method manually
CREATE_FUNC(HelloChipmunk);
void onEnter();
void initPhysics();
void addNewSpriteAtPosition(CCPoint p);
void update(float dt);
virtual void ccTouchesEnded(CCSet *pTouches,CCEvent *pEvent);
private:
CCTexture2D* m_pSpriteTexture; //精灵贴图
CCPhysicsDebugNode* m_pDebugLayer; //物理引擎DEBUG
cpSpace* m_pSpace; //物理空间
cpShape* m_pWalls[4]; //形状数组（四边）
};
HelloChipmunk.cpp
--------------------------------
#include "HelloChipmunk.h"
USING_NS_CC;
enum{
kTagParentNode = 1,};
enum{
Z_PHYSICS_DEBUG = 100,};
CCScene* HelloChipmunk::scene()
{
// 'scene' is an autorelease object
CCScene *scene = CCScene::create();
// 'layer' is an autorelease object
HelloChipmunk *layer = HelloChipmunk::create();
// add layer as a child to scene
scene->addChild(layer);
// return the scene
return scene;
}
// on "init" you need to initialize your instance
HelloChipmunk::HelloChipmunk()
{
}
HelloChipmunk::~HelloChipmunk()
{
for (int i=0; i<4; i++)
{
cpShapeFree(m_pWalls[i]);
}
cpSpaceFree( m_pSpace );
}
bool HelloChipmunk::init()
{
//////////////////////////////
// 1. super init first
if ( !CCLayer::init() )
{
return false;
}
//使能触摸
setTouchEnabled(true);
setAccelerometerEnabled(true);
//初始化物理引擎
initPhysics();
CCSpriteBatchNode* parent = CCSpriteBatchNode::create("blocks.png");
m_pSpriteTexture = parent->getTexture();
addChild(parent,kTagParentNode);
//添加新精灵
addNewSpriteAtPosition(ccp(200,200));
//更新
scheduleUpdate();
return true;
}
void HelloChipmunk::menuCallback(CCObject* pSender)
{
}
static void postStepRemove(cpSpace* space,cpShape *shape,void* unused)
{
int* spriteType = (int*)shape->data;
if (*spriteType == 1)
{
//delete
}
}
static int begin(cpArbiter* arb,cpSpace* space,void* unused)
{
cpShape* a;
cpShape* b;
cpArbiterGetShapes(arb,&a,&b);
cpSpaceAddPostStepCallback(space,(cpPostStepFunc)postStepRemove,a,NULL);
return 1; //return 0,不发生碰撞
}
void HelloChipmunk::initPhysics()
{
cpInitChipmunk();
m_pSpace = cpSpaceNew();
m_pSpace->gravity = cpv(0,-100);
m_pWalls[0] = cpSegmentShapeNew( m_pSpace->staticBody,//静态对象
cpv(0,0),cpv(480,0.0f);
m_pWalls[1] = cpSegmentShapeNew( m_pSpace->staticBody,320),0.0f);
m_pWalls[2] = cpSegmentShapeNew( m_pSpace->staticBody,cpv(0,0.0f);
m_pWalls[3] = cpSegmentShapeNew( m_pSpace->staticBody,//静态对象
cpv(480,0.0f);
for (int i=0; i<4; i++)
{
m_pWalls[i]->e = 1.0f; //摩擦系数等属性
m_pWalls[i]->u = 1.0f;
cpSpaceAddStaticShape(m_pSpace,m_pWalls[i]);
}
//创建debuglayer
m_pDebugLayer = CCPhysicsDebugNode::create(m_pSpace);
this->addChild(m_pDebugLayer,Z_PHYSICS_DEBUG);
//碰撞检测参数2和3指定碰撞类型
cpSpaceAddCollisionHandler(m_pSpace,1,begin,NULL,NULL);
}
void HelloChipmunk::update(float delta)
{
//不使用传进来的参数，因为传进来的参数会根据运行时间而变动
//采用固定每帧计算2次
int steps = 2;
float dt = CCDirector::sharedDirector()->getAnimationInterval()/(float)steps;
for (int i=0; i<steps; i++)
{
cpSpaceStep(m_pSpace,dt);
}
}
void HelloChipmunk::addNewSpriteAtPosition(CCPoint p)
{
int posx,posy;
CCNode* parent = getChildByTag(kTagParentNode);
posx = CCRANDOM_0_1() * 64.0f;
posy = CCRANDOM_0_1() * 64.0f;
posx = (posx % 2) * 32;
posy = (posy % 2) * 32;
int num = 4;
cpVect verts[] = {
cpv(-16,-16),cpv(-16,16),cpv( 16,};
//创建刚体
cpBody *body = cpBodyNew(1.0f,cpMomentForPoly(1.0f,num,verts,cpvzero));
body->p = cpv(p.x,p.y);
cpSpaceAddBody(m_pSpace,body);
//创建形状
cpShape* shape = cpPolyShapeNew(body,cpvzero);
shape->e =0.5f; shape->u = 0.5f;
int* tmp = new int;
*tmp = 1;
shape->data = tmp;
shape->collision_type = 1;
cpSpaceAddShape(m_pSpace,shape);
CCPhysicsSprite* sprite = CCPhysicsSprite::createWithTexture(m_pSpriteTexture,CCRectMake(posx,posy,32,32));
parent->addChild(sprite);
sprite->setCPBody(body);
sprite->setPosition(p);
}
void HelloChipmunk::onEnter()
{
CCLayer::onEnter();
}
void HelloChipmunk::ccTouchesEnded(CCSet *pTouches,CCEvent *pEvent)
{
CCSetIterator it;
CCTouch* touch;
for (it=pTouches->begin(); it!=pTouches->end (); it++)
{
touch = (CCTouch*)(*it);
if (!touch)
{
break;
}
CCPoint location = touch->getLocation();
addNewSpriteAtPosition( location );
}
}
===================================================================
总结：
总算把初级教程学习完了，接下来做个简单的游戏。
开心一刻：
毕业后七年，总算接了个大工程，造一根三十米烟囱，工期两个月，造价三十万，不过要垫资。总算在去年年底搞完了。今天人家去验收，被人骂得要死，还没有钱拿!图纸看反了，人家是要挖一口井！
【麦可网】Cocos2d-X跨平台游戏开发---教程下载:http://pan.baidu.com/s/1kTio1Av
【麦可网】Cocos2d-X跨平台游戏开发---笔记系列:http://blog.csdn.net/qiulanzhu
