基于cocos2d-x的含有物理属性的物件创建模板(优化版)

//
//  PhysicalWorld.hpp
//  gameProjectAlpha_01
//
//  Created by 胡博豪 on 16/2/1.
//
//

#ifndef PhysicalWorld_hpp
#define PhysicalWorld_hpp

#include "cocos2d.h"
#include "ui/CocosGUI.h"
#include "external/Box2D/Box2D.h"

#define BODY_TYPE_DYNAM b2_dynamicBody
#define BODY_TYPE_STA   b2_staticBody
#define BODY_TYPE_KINE  b2_kinematicBody

class PhysicalWorld : publicb2ContactListener {
protected:
~PhysicalWorld();
cocos2d::Layer *usedSceneClass;
b2World *world;
float ratio_mToPixels;
std::map<std::string, b2Body *> bodys;
float dt;
int velocityIterations;
int positionIterations;

public:
void createPhysicalWorld(cocos2d::Layer *this_ptr,float gravity_X = 0, float gravity_Y =9.8, float ratio_mToPix =1, float dt =1.0 / 60,int velocityIterations =8, int positionIterations =3);
void addRect(std::string name,b2BodyType type, float px, float py,float width, float height,float linearVelocityX = 0, float linearVelocityY =0, cocos2d::Color3B color =cocos2d::Color3B(255,255, 255),float density = 1,float friction = 0.1, float restitution =0);
void bodysUpdate()const;
b2Body *getBodyByName(std::string name)const;
cocos2d::Sprite *getSpriteByName(std::string name) const;
};

#endif /* PhysicalWorld_hpp */

//
//  PhysicalWorld.cpp
//  gameProjectAlpha_01
//
//  Created by 胡博豪 on 16/2/1.
//
//

#include "PhysicalWorld.hpp"
void PhysicalWorld::createPhysicalWorld(cocos2d::Layer *this_ptr, float gravity_X,float gravity_Y, float ratio_mToPix, float dt,int velocityIterations, int positionIterations) {
world =new b2World(b2Vec2(gravity_X, -gravity_Y));
world ->SetContactListener(this);
ratio_mToPixels = ratio_mToPix;
this ->dt = dt;
this ->velocityIterations = velocityIterations;
this ->positionIterations = positionIterations;
usedSceneClass = this_ptr;
}

PhysicalWorld::~PhysicalWorld() {
deleteworld;
}

void PhysicalWorld::addRect(std::string name, b2BodyType type, float px, float py,float width, float height,float linearVelocityX, float linearVelocityY, cocos2d::Color3B color,float density, float friction,float restitution) {
auto def =new b2BodyDef;
def -> type = type;
def -> position =b2Vec2(px, py);
auto rect =world -> CreateBody(def);
rect -> SetLinearVelocity(b2Vec2(linearVelocityX, linearVelocityY));
bodys.insert(std::make_pair(name, rect));
delete def;
def = nullptr;

auto sprite =cocos2d::Sprite::create();
sprite -> setTextureRect(cocos2d::Rect(0,0, width * 2 *ratio_mToPixels, height *2 * ratio_mToPixels));
sprite -> setColor(color);
sprite -> setPosition(cocos2d::Vec2(px *ratio_mToPixels, py * ratio_mToPixels));
usedSceneClass ->addChild(sprite);

rect -> SetUserData(sprite);
sprite -> setUserData(rect);

auto rectShape =new b2PolygonShape;
rectShape -> SetAsBox(width, height);
auto fixDef =new b2FixtureDef;
fixDef -> shape = rectShape;
fixDef -> density = density;
fixDef -> friction = friction;
fixDef -> restitution = restitution;
rect -> CreateFixture(fixDef);
delete rectShape;
rectShape = nullptr;
delete fixDef;
fixDef = nullptr;
}
void PhysicalWorld::bodysUpdate()const {
usedSceneClass ->schedule([&, this](float dt) {
for (std::pair<std::string,b2Body *> temp : bodys) {
world ->Step(dt, velocityIterations, positionIterations);
auto sp_temp = (cocos2d::Sprite *)temp.second -> GetUserData();
sp_temp -> setPosition(cocos2d::Vec2(temp.second -> GetPosition().x *ratio_mToPixels, temp.second ->GetPosition().y *ratio_mToPixels));
}
}, "bodySchedule ");
}

b2Body *PhysicalWorld::getBodyByName(std::string name) const {
returnbodys.find(name) ->second;
}
cocos2d::Sprite *PhysicalWorld::getSpriteByName(std::string name) const {
return (cocos2d::Sprite *)bodys.find(name) -> second -> GetUserData();
}