渲染树的简单实现(链表实现)

曾经终败给现在 2022-05-15 02:21 216阅读 0赞

//对象的创建初始化,挂到链表上去
    //实现了简单的内存管理
    
    class CCSprite {
    private:
    	static CCSprite* head;
    	CCSprite* next;
    public:
    	CCSprite(){}
    	static CCSprite* create() {
    		CCSprite *sprite = new CCSprite;
    		if (sprite && sprite->init()) {  
    			sprite->autoRelease();
    			return sprite;
    		}
    		else {
    			delete sprite;
    			sprite = nullptr;
    			exit(-1);
    		}
    		
    	}
    
    	bool init() {
    		cout << "init sprite" << endl;
    		return true;
    	}
    
    	static void renderTree() {
    		CCSprite* t = head;
    		while (t) {
    
    			t = t->next;
    		}
    	}
    
    	void autoRelease() {   //内存挂到链表上
    		this->next = head;
    		head = this;
    	}
    
    };
    
    CCSprite* CCSprite::head = nullptr;
    
    int main() {
    
    	CCSprite* ps = CCSprite::create();   //利用渲染树生成精灵
    	CCSprite* ps2 = CCSprite::create();
    	CCSprite* ps3 = CCSprite::create();
    	CCSprite* ps4 = CCSprite::create();
    
    	system("PAUSE");
    }

多态实现不同的类对象连接到渲染树上(利用父类指针的赋值兼容)

#include <iostream>
    #include <thread>
    using namespace std;
    
    class RenderShape { // 抽象基类
    public:
    	virtual void show() = 0;
    	bool init(int x,int y) {  //初始化函数
    		_x = x;
    		_y = y;
    
    		return true;
    	}
    	
    	static void rendershapeList() { 
    		RenderShape* t = head;
    		while (t) {
    			t->show();   //通过父类的指针覆写子类
    			t = t->next;
    		}
    	}
    
    protected:
    	int _x;
    	int _y;
    
    	static RenderShape* head;
    	RenderShape* next;
    };
    RenderShape * RenderShape::head = nullptr;
    
    class Rect :public RenderShape
    {
    public:
    	static Rect* create(int x,int y,int w,int l) {
    		Rect* prect = new Rect;
    		if (prect && prect->init(x, y, w, l)) {
    			prect->autoRelease();
    			return prect;
    		}
    		else {
    			delete prect;
    			prect = nullptr;
    		}
    	}
    
    	
    	void show() override {
    		cout << "draw rect from" << "(" << _x << "," << _y << ")" <<","<<_w<<","<<_l<<endl;
    	}
    
    	//二段式初始化
    	bool init(int x, int y, int w, int l) {
    		RenderShape::init(x, y);   
    		_w = w;
    		_l = l;
    		return true;
    	}
    
    	void autoRelease() {
    			this->next = head;
    			head = this;
    	}
    
    protected:
    	int _w;
    	int _l;
    };
    
    class Circle :public RenderShape
    {
    public:
    	void show() override {
    		cout << "draw circle from" << "(" << _x << "," << _y << ")" <<"||"<<_r<< endl;
    	}
    
    	static Circle* create(int x,int y,int r) {
    		Circle* pCircle = new Circle;
    		if (pCircle && pCircle->init(x, y, r)) {
    			pCircle->autoRelease();
    			return pCircle;
    		}
    		else {
    			delete pCircle;
    			pCircle = nullptr;
    		}
    	}
    
    	bool init(int x, int y, int r) {
    		RenderShape::init(x, y);
    		_r = r;
    		return true;
    	}
    	
    	void autoRelease() {
    		this->next = head;
    		head = this;
    	}
    
    protected:
    	int _r;
    };
    
    class Ellipse :public RenderShape
    {
    public:
    	void show() override {
    		cout << "draw Ellipse from" << "(" << _x << "," << _y << ")" << "||" << _l <<" "<<_s<< endl;
    	}
    
    	static Ellipse* create(int x, int y, int l,int s) {
    		Ellipse* pEllipse = new Ellipse;
    		if (pEllipse && pEllipse->init(x, y, l, s)) {
    			pEllipse->autoRelease();
    			return pEllipse;
    		}
    		else {
    			delete pEllipse;
    			pEllipse = nullptr;
    		}
    	}
    
    	bool init(int x, int y, int l,int s) {
    		RenderShape::init(x, y);
    		_l = l;
    		_s = s;
    		return true;
    	}
    
    	void autoRelease() {
    		this->next = head;
    		head = this;
    	}
    protected:
    	int _l;
    	int _s;
    };
    
    
    
    int main() {
    
    	Rect *pr1 = Rect::create(1, 2, 3, 4);
    	Rect *pr2 = Rect::create(5, 2, 7, 4);
    
    	Circle *pc1 = Circle::create(5, 3, 10);
    	Ellipse *pe1 = Ellipse::create(5, 12, 15, 90);
    
    	RenderShape::rendershapeList();  //渲染链
    	system("PAUSE");
    }