SDL入门文字的显示.doc

SDL文字的显示在游戏中是经常需要输出文字的，如计数、提示、显示分数，这次写这个主要是为我那个俄罗斯方块计分。当然了显示分数可以用图片，也可以用专门的文字绘制函数，这里主要讲用函数这种方法。1、下载适合VS2005使用的文字操纵库下载地址如下：/projects/SDL_ttf/release/SDL_ttf-devel-2.0.9-VC8.zip 2、解压后拷贝文件，跟第一篇文章一样3、配置IDE环境：剩下的就是敲代码了/*作者：云飞功能：SDL输出文字*/#include #include #include #include const int SCREEN_WIDTH = 640;const int SCREEN_HEIGHT = 480;const int SCREEN_BPP = 32;TTF_Font *font = NULL;SDL_Surface *screen = NULL;/*function name:initSDL parameter:void/noneparameter note:return:int1:initial SDL normally0:initial SDL abnormallyfunction:initial SDL*/int initSDL(void)/init all SDL subsystemsif (SDL_Init(SDL_INIT_EVERYTHING) = -1)printf(初始化失败！n);return 0;/init screenscreen = SDL_SetVideoMode(SCREEN_WIDTH,SCREEN_HEIGHT,SCREEN_BPP,SDL_SWSURFACE);if (screen = NULL)printf(初始化屏幕失败！请检查显卡！n);return 0;/init ttfif (TTF_Init() = -1)printf(初始化字库失败！n);return 0;return 1;/*function name:quitSDL parameter:voidparameter note:return:voidfunction:closs SDl*/void quitSDL(void)/Close the font that was usedTTF_CloseFont(font);TTF_Quit();SDL_Quit();/*function name: loadMessageparameter:const char *text,SDL_Color &textColor,const char *FontFile,int sizeparameter note:const char *text:the text contentSDL_Color &textColor:text colorconst char *FontFile:font file nameint size:text sizereturn:SDL_Surface* function:load font file*/SDL_Surface* loadMessage(const char *text,SDL_Color &textColor,const char *FontFile,int size)font = TTF_OpenFont(simhei.ttf,size);if (font = NULL)printf(打开字体失败！n);return 0;return TTF_RenderText_Solid(font,text,textColor);/*我这破英语水平都能猜出前面TTF_Font TTF_OpenFont TTF_RenderText_Solid TTF_CloseFont的大概意思，相信你更能，都是些函数不必知道它怎么写的会用就行了都是些套路，别人写好的函数，咱们就是用用没什么难度,可以看出TTF_RenderText_Solid返回值是SDL_Surface*/*你是否注意到了simhei.ttf这个文件，TTF是一种字库名称，兴趣的可以查查百度知道（相信你会知道的更多）就是咱们那宋体呀楷体什么的，可以到系统的fonts(C:WindowsFonts)文件夹下找到，找到后放到cpp文件同目录下（你在搜索栏那儿一搜出来了）这个是那个黑体*/*function name: showTextparameter:SDL_Surface *msg,int x,int y,int width,int height,SDL_Surface *destinationparameter note:SDL_Surface *msg:the text handlerint x:texts left positionint y:texts top positionint width:texts widthint height:texts heightSDL_Surface *destination:where to showreturn:voidfunction:show text to display memory*/void showText(SDL_Surface *msg,int x,int y,int width,int height,SDL_Surface *destination)SDL_Rect textPosition;textPosition.x = x;textPosition.y = y;textPosition.w = (width = 0) ? msg-w:width;textPosition.h = (height = 0) ? msg-h:height;SDL_BlitSurface(msg,NULL,destination,&textPosition);void showScreen(void)/刷新屏幕SDL_Flip(screen);int main(int argc,char *argv)SDL_Surface *text;SDL_Color textColor = 255,255,255;/white/initial SDLinitSDL();text = loadMessage(successfully,textColor,simhei.ttf,60);/show text to display memoryshowText(text,0,0,0,0,screen);showScreen();SDL_Delay(5000);quitSDL(