如何在cocos2d-x中使用box2d进行碰撞检测 [英] how to use box2d for collision detection in cocos2d-x
本文介绍了如何在cocos2d-x中使用box2d进行碰撞检测的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我的两个精灵是角色角色和英雄.我想在cocos2d-x中使用box2d检测到它们的碰撞 我已经在屏幕上移动了两个精灵(自动滚动，手动英雄).
my two sprites are roll and hero. i want to detect their collision using box2d in cocos2d-x i have got both the sprites moving on the screen (roll automatically, hero manually).
我要做的就是调用函数intersection()；
all i want to do is call the function intersection();
两个精灵碰撞时. (精灵会在* .h文件中全局声明)
when the two sprites collide. (sprites are declared globally in the *.h file)
#include "GameScene.h"
#include "HomeScene.h"
USING_NS_CC;
CCScene* GameScene::scene()
{
// 'scene' is an autorelease object
CCScene *scene = CCScene::node();
// 'layer' is an autorelease object
GameScene *layer = GameScene::node();
// add layer as a child to scene
scene->addChild(layer);
// return the scene
return scene;
}
// on "init" you need to initialize your instance
bool GameScene::init()
{
//////////////////////////////
// 1. super init first
if ( !CCLayerColor::initWithColor(ccc4(0,0,0,255) ))
{
return false;
}
//////////////////////////////
// 2. add your codes below...
count=0;
life=3;
CCSize WinSize= CCDirector::sharedDirector()->getWinSize();
// background
CCSprite * bg=CCSprite::spriteWithFile("bg.png");
bg->setPosition(CCPointZero);
bg->setAnchorPoint(CCPointZero);
bg->setScaleX(WinSize.width/460);
bg->setScaleY(WinSize.height/325);
this->addChild(bg,0,1);
//close button
CCSprite * back=CCSprite::spriteWithFile("close.png");
CCSprite * back1=CCSprite::spriteWithFile("closeS.png");
CCMenuItemSprite *home=CCMenuItemSprite::itemFromNormalSprite(back,back1,this,menu_selector(GameScene::callNext));
CCMenu *MenuClose=CCMenu::menuWithItem(home);
MenuClose->setPosition(ccp(WinSize.width-20,WinSize.height-20));
this->addChild(MenuClose,5,1);
//life icon
CCSprite * rc=CCSprite::spriteWithFile("rc.png");
rc->setPosition(ccp(20,WinSize.height-20));
this->addChild(rc,5,15);
//score icon
CCSprite * dp=CCSprite::spriteWithFile("dp.png");
dp->setPosition(ccp(55,WinSize.height-20));
this->addChild(dp,5,18);
//insert roller at a random place
roll=CCSprite::spriteWithFile("ball.png");
int minY = (roll->getContentSize().height/2)+(WinSize.height/(4.5));
int maxY = (WinSize.height)- (roll->getContentSize().height/2);
int rangeY = maxY - minY;
srand ( time(NULL) );
int actualY = ( rand() % rangeY ) + minY;
CCLOG("the actualY is oooooooooooooooooooooooooooooooooooooooooooooooooooooooo %d",actualY);
roll->setPosition(ccp(20,actualY));
this->addChild(roll,5,8);
// Determine speed of the roller
int minDuration = 3;
int maxDuration = 7;
int rangeDuration = maxDuration - minDuration;
int actualDuration = ( rand() % rangeDuration)+ minDuration;
/*
//creating constraints for the roller
float maxXX = WinSize.width - roll->getContentSize().width/2;
float minXX =roll->getContentSize().width/2;
if (roll->getPosition().x > maxXX)
{
roll->setPosition( ccp(maxXX, roll->getPosition().y)) ;
}
else if (roll->getPosition().x < minXX)
{
roll->setPosition (ccp(minXX,roll->getPosition().y));
}
float maxYY = WinSize.height - roll->getContentSize().height/2;
float minYY = roll->getContentSize().height/2;
if (roll->getPosition().y > maxYY)
{
roll->setPosition ( ccp(roll->getPosition().x, maxYY));
}
else if (getPosition().y < minYY)
{
roll->setPosition( ccp(roll->getPosition().x, minYY));
}
*/
// Create the rolling action
roll->runAction(CCRepeatForever::actionWithAction((CCSequence*) CCSequence::actions(
CCJumpTo::actionWithDuration( actualDuration,ccp(WinSize.width,( rand() % rangeY ) + minY ),( rand() % rangeY ) + minY,4 ),
CCHide::action(),
CCMoveTo::actionWithDuration(0,ccp(20,( rand() % rangeY ) + minY)),
CCShow::action(),
CCCallFunc::actionWithTarget( this,callfunc_selector(GameScene::scores)),
NULL)) );
//displaying scores
sprintf(score,"%d",count);
scr= CCLabelBMFont::labelWithString(score , "arial16.fnt");
scr->setPosition(ccp(55,WinSize.height-20));
scr->setColor(ccc3(0,0,255));
this->addChild(scr,50);
//displaying lifes
sprintf(lifeLabel,"%d",life);
lif= CCLabelBMFont::labelWithString(lifeLabel , "arial16.fnt");
lif->setPosition(ccp(20,WinSize.height-20));
lif->setColor(ccc3(0,0,255));
this->addChild(lif,50);
// insert animated hero
CCSpriteFrameCache::sharedSpriteFrameCache()->addSpriteFramesWithFile("boyJog.plist","boyJog.png");
CCMutableArray<CCSpriteFrame*> *proFrame = new CCMutableArray<CCSpriteFrame *>;
hero = CCSprite::spriteWithSpriteFrameName("boyJog1.png");
hero->setPosition(ccp(WinSize.width/2-30,WinSize.height/(4.5)));
hero->setAnchorPoint(CCPointZero);
char buff[60];
for(int i=1;i<=13;i++)
{
sprintf(buff,"boyJog%d.png",i);
proFrame->addObject( (CCSpriteFrameCache::sharedSpriteFrameCache())->spriteFrameByName(buff));
}
CCAnimation *progressAnimation=CCAnimation::animationWithFrames(proFrame, 0.05);
//set animation object here
CCAnimate *animate=CCAnimate::actionWithAnimation(progressAnimation,false);
hero->runAction(CCRepeatForever::actionWithAction(animate));
hero->setScale(.5);
this->addChild( hero);
//left right button
CCSprite *moveRight= CCSprite::spriteWithFile("arrowRight.png");
CCSprite *moveLeft= CCSprite::spriteWithFile("arrowLeft.png");
CCSprite *moveRightS= CCSprite::spriteWithFile("arrowRight.png");
CCSprite *moveLeftS= CCSprite::spriteWithFile("arrowLeft.png");
CCMenuItemSprite *right=CCMenuItemSprite::itemFromNormalSprite(moveRight,moveRightS,this,menu_selector(GameScene::heroRight));
CCMenuItemSprite *left=CCMenuItemSprite::itemFromNormalSprite(moveLeft,moveLeftS,this,menu_selector(GameScene::heroLeft));
CCMenu *RL =CCMenu::menuWithItems(left,right,NULL);
RL->alignItemsHorizontallyWithPadding(20);
RL->setPosition(ccp(WinSize.width-40,20));
RL->setOpacity(150);
this->addChild(RL);
//jump button
CCSprite *jump= CCSprite::spriteWithFile("arrowUp.png");
CCSprite *jumpS= CCSprite::spriteWithFile("arrowUp.png");
CCMenuItemSprite *mmJump=CCMenuItemSprite::itemFromNormalSprite(jump,jumpS,this,menu_selector(GameScene::heroJump));
CCMenu *menuJump=CCMenu::menuWithItem(mmJump);
menuJump->setPosition(ccp(20,20));
menuJump->setOpacity(150);
this->addChild(menuJump,5,12);
//////////////////////////////
return true;
}
void GameScene::callNext(CCObject *sender)
{
CCLOG("game played");
CCDirector::sharedDirector()->replaceScene(CCTransitionFade::transitionWithDuration(1,(HomeScene::scene())));
//exit(1);
}
void GameScene::heroJump(CCObject *sender)
{
CCLOG(" U");
CCSize WinSize= CCDirector::sharedDirector()->getWinSize();
CCPoint Pt=hero->getPosition();
hero->runAction(CCJumpTo::actionWithDuration(1,ccp(Pt.x,WinSize.height/(4.5)),50,1));
}
void GameScene::heroLeft(CCObject *sender)
{
CCLOG(" L");
CCSize WinSize= CCDirector::sharedDirector()->getWinSize();
CCPoint Pt=hero->getPosition();
hero->runAction(CCJumpTo::actionWithDuration(1,ccp(Pt.x-30,WinSize.height/(4.5)),0,1));
hero->setFlipX(1);
//hero->runAction(CCRepeatForever::actionWithAction(animate));
}
void GameScene::heroRight(CCObject *sender)
{
CCLOG(" R");
CCSize WinSize= CCDirector::sharedDirector()->getWinSize();
CCPoint Pt=hero->getPosition();
hero->runAction(CCJumpTo::actionWithDuration(1,ccp(Pt.x+30,WinSize.height/(4.5)),0,1));
hero->setFlipX(0);
//hero->runAction(CCRepeatForever::actionWithAction(animate));
}
void GameScene::scores()
{
count+=10;
CCLOG("count ==========================%d",count);
sprintf(score,"%d",count);
scr->setString(score);
}
void GameScene::intersection()
{
CCLOG("collided..........................................................");
}
推荐答案
高兴的是没有冲突.您必须使用Box2D，同步图形和物理来创建其物理表示.然后，您必须实现自己的联系侦听器(继承自b2ContactListener)，并在发生碰撞时使用它来通知.
Sprited are not colliding. You have to create their physical representation using Box2D, sync graphics and physics. Then you have to implement your own contact listener (inherit from b2ContactListener) and use it to be notified when collision happens.
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