box2d实力触摸不规则图片

来源：互联网发布：火炬之光2mac版本更新编辑：程序博客网时间：2024/06/09 22:39

原文地址：http://www.cocoachina.com/bbs/read.php?tid=209290

HelloWorldScene文件

#ifndef __HELLOWORLD_SCENE_H__#define __HELLOWORLD_SCENE_H__#include "cocos2d.h"class HelloWorld : public cocos2d::Layer{    cocos2d::Sprite* sp_2dx = nullptr;    cocos2d::LabelTTF*  status_label = nullptr;public:    static cocos2d::Scene* createScene();    virtual bool init();    void menuCloseCallback(cocos2d::Ref* pSender);    bool onTouchBegan(cocos2d::Touch* touch, cocos2d::Event* event);    void onTouchMoved(cocos2d::Touch* touch, cocos2d::Event* event);    void onTouchEnded(cocos2d::Touch* touch, cocos2d::Event* event);    Node* nodeUnderTouch(cocos2d::Touch* touch);    CREATE_FUNC(HelloWorld);};#endif

#include "HelloWorldScene.h"#include "MyBodyParser.h"USING_NS_CC;Scene* HelloWorld::createScene(){    auto scene = Scene::createWithPhysics();    scene->getPhysicsWorld()->setDebugDrawMask(PhysicsWorld::DEBUGDRAW_ALL);    auto layer = HelloWorld::create();    scene->addChild(layer);    return scene;}bool HelloWorld::init(){    if ( !Layer::init() )    {        return false;    }        Size visibleSize = Director::getInstance()->getVisibleSize();    Point origin = Director::getInstance()->getVisibleOrigin();    auto closeItem = MenuItemImage::create(                                           "CloseNormal.png",                                           "CloseSelected.png",                                           CC_CALLBACK_1(HelloWorld::menuCloseCallback, this));closeItem->setPosition(Point(origin.x + visibleSize.width - closeItem->getContentSize().width/2 ,                                origin.y + closeItem->getContentSize().height/2));    auto menu = Menu::create(closeItem, NULL);    menu->setPosition(Point::ZERO);    this->addChild(menu, 1);        auto label = LabelTTF::create("Physics Body Loader Demo", "Arial", 24);    label->setPosition(Point(origin.x + visibleSize.width/2,                            origin.y + visibleSize.height - label->getContentSize().height));    this->addChild(label, 1);    status_label = LabelTTF::create("Touch anywhere!", "Arial", 36);    status_label->setPosition(Point(origin.x + visibleSize.width/2, 1.2*status_label->getContentSize().height));    this->addChild(status_label);    sp_2dx = Sprite::create("2dx.png");    sp_2dx->setPosition(Point(visibleSize.width/2 + origin.x, visibleSize.height/2 + origin.y));    MyBodyParser::getInstance()->parseJsonFile("bodies.json");    auto _body = MyBodyParser::getInstance()->bodyFormJson(sp_2dx, "2dx");    if (_body != nullptr) {        _body->setDynamic(false);        _body->setCollisionBitmask(0x000000);        sp_2dx->setPhysicsBody(_body);    }    this->addChild(sp_2dx, 0);    auto touchListener = EventListenerTouchOneByOne::create();    touchListener->onTouchBegan = CC_CALLBACK_2(HelloWorld::onTouchBegan, this);    touchListener->onTouchMoved = CC_CALLBACK_2(HelloWorld::onTouchMoved, this);    touchListener->onTouchEnded = CC_CALLBACK_2(HelloWorld::onTouchEnded, this);    _eventDispatcher->addEventListenerWithSceneGraphPriority(touchListener, this);    return true;}Node* HelloWorld::nodeUnderTouch(cocos2d::Touch *touch){    Node* node = nullptr;    //转换到layer内的坐标    auto location = this->convertTouchToNodeSpace(touch);    //得到当前点下方的物理shapes    auto scene = Director::getInstance()->getRunningScene();    auto arr = scene->getPhysicsWorld()->getShapes(location);        //遍历当前点击到的所有shapes, 看看有没有我们的2dx!    for (auto& obj : arr)    {        if ( obj->getBody()->getNode() == sp_2dx)        {            node = obj->getBody()->getNode();            break;        }    }    return node;}bool HelloWorld::onTouchBegan(Touch* touch, Event* event){    auto current_node = nodeUnderTouch(touch);    if (current_node == sp_2dx)    {        status_label->setColor(Color3B::GREEN);        status_label->setString("Ohoo, U catch me!");    }    else    {        status_label->setColor(Color3B::RED);        status_label->setString("Haha, touch outside!");    }    return true;}void HelloWorld::onTouchMoved(Touch* touch, Event* event){}void HelloWorld::onTouchEnded(Touch* touch, Event* event){    status_label->setColor(Color3B::WHITE);    status_label->setString("Touch anywhere!");}void HelloWorld::menuCloseCallback(Ref* pSender){}

MyBodyParser文件

#pragma once#include <string>#include "cocos2d.h"USING_NS_CC;#include "json/document.h"class MyBodyParser {    MyBodyParser(){}    rapidjson::Document doc;public:    static MyBodyParser* getInstance();    bool parseJsonFile(const std::string& pFile);    bool parse(unsigned char* buffer, long length);    void clearCache();    PhysicsBody* bodyFormJson(Node* pNode, const std::string& name);};

#include "MyBodyParser.h"MyBodyParser* MyBodyParser::getInstance(){    static MyBodyParser* sg_ptr = nullptr;    if (nullptr == sg_ptr)    {        sg_ptr = new MyBodyParser;    }    return sg_ptr;}bool MyBodyParser::parse(unsigned char *buffer, long length){    bool result = false;    std::string js((const char*)buffer, length);    doc.Parse<0>(js.c_str());    if(!doc.HasParseError())    {        result = true;    }    return result;}void MyBodyParser::clearCache(){    doc.SetNull();}bool MyBodyParser::parseJsonFile(const std::string& pFile){    auto content = FileUtils::getInstance()->getDataFromFile(pFile);    bool result = parse(content.getBytes(), content.getSize());    return result;}//从json文件加载正确的bodyPhysicsBody* MyBodyParser::bodyFormJson(cocos2d::Node *pNode, const std::string& name){    PhysicsBody* body = nullptr;    rapidjson::Value &bodies = doc["rigidBodies"];    if (bodies.IsArray())    {        //遍历文件中的所有body        for (int i=0; i<bodies.Size(); ++i)        {            //找到了请求的那一个            if (0 == strcmp(name.c_str(), bodies[i]["name"].GetString()))            {                rapidjson::Value &bd = bodies[i];                if (bd.IsObject())                {                    //创建一个PhysicsBody, 并且根据node的大小来设置                    body = PhysicsBody::create();                    float width = pNode->getContentSize().width;                                        //多边形的锚点默认都是左下角，精灵的不一定，                    float offx = - pNode->getAnchorPoint().x * pNode->getContentSize().width;                    float offy = - pNode->getAnchorPoint().y * pNode->getContentSize().height;                    Point origin( bd["origin"]["x"].GetDouble(), bd["origin"]["y"].GetDouble());                    rapidjson::Value &polygons = bd["polygons"];                    for (int i = 0; i<polygons.Size(); ++i)                    {                        int pcount = polygons[i].Size();                        Point* points = new Point[pcount];                        for (int pi = 0; pi<pcount; ++pi)                        {                            points[pi].x = offx + width * polygons[i][pcount-1-pi]["x"].GetDouble();                            points[pi].y = offy + width * polygons[i][pcount-1-pi]["y"].GetDouble();                        }                        body->addShape(PhysicsShapePolygon::create(points, pcount, PHYSICSBODY_MATERIAL_DEFAULT));                        delete [] points;                    }                }                else                {                    CCLOG("body: %s not found!", name.c_str());                }                break;            }        }    }    return body;}

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