cocos2d-x之物理引擎之碰撞监测

#include "HelloWorldScene.h"

USING_NS_CC;

#define RED_BIT_MASK    0b0100

#define GREEN_BIT_MASK  0b0010

#define BLUE_BIT_MASK   0b0001

#define EDGE_BIT_MASK   0b1000

Scene* HelloWorld::createScene()

{

auto scene = Scene::createWithPhysics();

scene->getPhysicsWorld()->setDebugDrawMask(PhysicsWorld::DEBUGDRAW_ALL);

scene->getPhysicsWorld()->setGravity(Vec2(0,-1000));

auto layer = HelloWorld::create();

scene->addChild(layer);

return scene;

}

bool HelloWorld::init()

{

if ( !Layer::init() )

{

return false;

}

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

auto touchListener=EventListenerTouchOneByOne::create();

touchListener->onTouchBegan =[this](Touch * t,Event * e){

this->addBox(t->getLocation());

return false;

};

Director::getInstance()->getEventDispatcher()->addEventListenerWithSceneGraphPriority(touchListener,this);

auto contactListener=EventListenerPhysicsContact::create();

contactListener->onContactBegin=[](PhysicsContact & contact){

switch (contact.getShapeA()->getBody()->getContactTestBitmask()|contact.getShapeB()->getBody()->getContactTestBitmask()) {

case RED_BIT_MASK|BLUE_BIT_MASK:

log("red rect contact blue rect");

break;

case RED_BIT_MASK|GREEN_BIT_MASK:

log("red rect contact green rect");

break;

case BLUE_BIT_MASK|GREEN_BIT_MASK:

log("blue rect contact green rect");

break;

case RED_BIT_MASK|EDGE_BIT_MASK:

log("red rect hit edge");

break;

case GREEN_BIT_MASK|EDGE_BIT_MASK:

log("green rect hit edge");

break;

case BLUE_BIT_MASK|EDGE_BIT_MASK:

log("blue rect hit edge");

break;

case GREEN_BIT_MASK:

log("two green rect hit");

break;

default:

break;

}

return true;

};

Director::getInstance()->getEventDispatcher()->addEventListenerWithSceneGraphPriority(contactListener,this);

return true;

}

void HelloWorld::onEnter(){

Layer::onEnter();

auto bounds=Node::create();

bounds->setContentSize(visibleSize);

bounds->setPhysicsBody(PhysicsBody::createEdgeBox(bounds->getContentSize()));

bounds->getPhysicsBody()->setContactTestBitmask(EDGE_BIT_MASK);

bounds->setPosition(visibleSize/2);

addChild(bounds);

addBox(visibleSize/2);

}

void HelloWorld::addBox(Vec2 position){

auto r=Sprite::create();

r->setTextureRect(Rect(50,50,50,50));

r->setPhysicsBody(PhysicsBody::createBox(r->getContentSize()));

addChild(r);

r->setPosition(position);

//    switch (rand()%6) {

//        case 0:

//            r->setColor(Color3B(255,0,255));

//            break;

//        case 1:

//            r->setColor(Color3B(255,0,0));

//            break;

//        case 2:

//            r->setColor(Color3B(0,255,0));

//            break;

//        case 3:

//            r->setColor(Color3B(0,0,255));

//            break;

//        case 4:

//            r->setColor(Color3B(0,255,255));

//            break;

//        case 5:

//            r->setColor(Color3B(255,255,0));

//            break;

//        default:

//            break;

//    }

switch (rand()%3) {

case 0:

r->setColor(Color3B(255,0,0));

r->getPhysicsBody()->setContactTestBitmask(RED_BIT_MASK);

break;

case 1:

r->setColor(Color3B(0,255,0));

r->getPhysicsBody()->setContactTestBitmask(GREEN_BIT_MASK);

break;

case 2:

r->setColor(Color3B(0,0,255));

r->getPhysicsBody()->setContactTestBitmask(BLUE_BIT_MASK);

break;

default:

break;

}

}

void HelloWorld::menuCloseCallback(Ref* pSender)

{

Director::getInstance()->end();

#if (CC_TARGET_PLATFORM == CC_PLATFORM_IOS)

exit(0);

#endif

}