SDL2 游戏开发日志（二）

最新推荐文章于 2024-06-13 08:49:14 发布

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最新推荐文章于 2024-06-13 08:49:14 发布 · 1.4k 阅读

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#SDL2 #游戏编程

SDL2 游戏开发日志（二）

构建框架：场景，渲染。

渲染类

负责加载图片和渲染，它将可以添加到指定的【场景】中，当【场景】被【场景管理类】调用时，它将每一帧都被调用和更新。

#pragma once
#include <SDL.h>
#include <string>
using namespace std;

class Renderable{
protected:
	bool mIsDeleted;
	bool mIsVisible;
	int mLayer;
	SDL_Rect *mRenderRect;
	SDL_Rect *mClipRect;
	SDL_Texture *mTexture;
	int mTextureWidth, mTextureHeight;

public:
	Renderable() :mIsDeleted(false), mIsVisible(true){
		mTexture = NULL;
		mRenderRect = NULL;
		mClipRect = NULL;
		mLayer = 0;
	}
	virtual ~Renderable(){
		if (mTexture != NULL){
			SDL_DestroyTexture(mTexture);
			mTexture = NULL;
		}
		if (mRenderRect != NULL){
			delete mRenderRect;
			mRenderRect = NULL;
		}
		if (mClipRect != NULL){
			delete mClipRect;
			mClipRect = NULL;
		}
	}

	void SetLayer(int layer){
		mLayer = layer;
	}
	int GetLayer(){
		return mLayer;
	}
	virtual bool LoadTexture(string fileName);

	void SetPos(int x,int y){
		if (mRenderRect != NULL){
			mRenderRect->x = x;
			mRenderRect->y = y;
		}
	}

	bool IsDeleted(){
		return mIsDeleted;
	}

	void Delete(){
		mIsDeleted = true;
	}

	bool IsVisible(){
		return mIsVisible;
	}
	void SetVisible(bool visible){
		mIsVisible = visible;
	}

	virtual void Update(float time_step){}
	virtual void Render();

	int GetWidth(){
		return mTextureWidth;
	}
	int GetHeight(){
		return mTextureHeight;
	}
};

bool Renderable::LoadTexture(string fileName){
	bool bResult = false;
	if (mTexture != NULL){
		SDL_DestroyTexture(mTexture);
		mTexture = NULL;
	}
	SDL_Surface *surface = IMG_Load(fileName.c_str());
	if (surface != NULL){
		mTexture = SDL_CreateTextureFromSurface(theGame.getRenderer(), surface);
		if (mTexture != NULL){
			if (mRenderRect == NULL)
				mRenderRect = new SDL_Rect();
			mRenderRect->w = surface->w;
			mRenderRect->h = surface->h;
			mTextureWidth = surface->w;
			mTextureHeight = surface->h;
			bResult = true;
		}
		SDL_FreeSurface(surface);
	}
	return bResult;
}

void Renderable::Render(){	
	if (!mIsVisi