function.c.save

/*
This function lib edit by KosWu.
KosWu's Blog: blog.koswu.com
*/
/*头文件声明*/
#include "SDL/SDL.h"
#include "SDL/SDL_image.h"
#include "SDL/SDL_ttf.h"
#include "SDL/SDL_mixer.h"
#include "common.h"
#include "error.h"
/*全局变量*/
SDL_Surface* Screen=NULL;//屏幕表面
SDL_Surface * FpsCount;
SDL_Event Event;//事件类型
Location Mouse;//鼠标位置
SDL_Color Fontcolor;
TTF_Font * Font;
SDL_Surface* Point;
Timer Fps;
Timer Updatefps;
int Frame=0;
TTF_Font * FPSFont;

/*文件变量*/

/*函数定义*/
char *itoa(int num,char *str,int radix);
void Init (void);
void Error (int errorcode);
SDL_Surface *Print_Text(char * text);
void CopyToSurface(int x,int y,SDL_Surface * source,SDL_Surface * target,SDL_Rect * cli);
void SetTextColor (unsigned short r,unsigned short g,unsigned short b);
void PrintMouse (void);
void GetMouseLocation (void);
void Flip_Screen(void);
void Set_ScreenColor (unsigned short r,unsigned short g,unsigned short b);
void PrintFPS (void);
void Clean_Up(void);

/*错误退出函数*/
void Error (int errorcode)
{
	if (errorcode<0x10)
	{
		Clean_Up();
		exit (errorcode);
	}
	SetTextColor (0xFF,0,0);
	SDL_Surface * error;
	char errormessage[50]="Program has an error!QAQ";
	char errorchar[10];
	error=Print_Text(errormessage);
	SDL_FillRect(Screen,&(Screen->clip_rect),SDL_MapRGB(Screen->format,0xFF,0xFF,0xFF));
	CopyToSurface((WIDTH-error->w)/2,(HEIGHT-error->h)/2-error->h-20,error,Screen,NULL);
	SDL_FreeSurface(error);
	strcpy (errormessage,"Program will exit after 10s");
	error=Print_Text(errormessage);
	CopyToSurface((WIDTH-error->w)/2,(HEIGHT-error->h)/2,error,Screen,NULL);
	SDL_FreeSurface(error);
	strcpy (errormessage,"Error Code：0x");
	itoa (errorcode,errorchar,16);
	strcat (errormessage,errorchar);
	error=Print_Text(errormessage);
	CopyToSurface((WIDTH-error->w)/2,(HEIGHT-error->h)/2+error->h+20,error,Screen,NULL);
	SDL_FreeSurface(error);
	if (SDL_Flip(Screen)<0)
	{
		Error (ERROR_FLIPSCREEN);
	}
	SDL_Delay (10000);
	SDL_Quit();
	exit (errorcode);
}

/*初始化*/
void Init (void)
{
	/*窗口位置居中*/
	putenv ("SDL_VIDEO_WINDOW_POS");
putenv ("SDL_VIDEO_CENTERED=1");
	/*初始化SDL所有子系统*/
	if (SDL_Init(SDL_INIT_EVERYTHING)<0)
	{
		Error (ERROR_INIT_SDL);
	}
	/*初始化字体系统*/
	if( TTF_Init() <0)
    {
    	Error (ERROR_INIT_FONTLIB);
    }
    /*初始化声音系统*/
    if (Mix_OpenAudio(44100,MIX_DEFAULT_FORMAT,2,1024)<0)
    {
    	Error (ERROR_INIT_MIXLIB);
    }
    if (Mix_Init(MIX_INIT_MP3)<0)
    {
    	Error (ERROR_INIT_MIXLIB);
    }
	/*初始化屏幕表面*/
	Screen=SDL_SetVideoMode(WIDTH,HEIGHT,BPP,SDL_HWSURFACE|SDL_DOUBLEBUF);
	if (Screen==NULL)
	{
		exit (ERROR_INIT_SDL);
	}
	/*设置标题*/
	SDL_WM_SetCaption("Bad Apple!!",NULL);
	/*启动计时器*/
	Fps.last_time=SDL_GetTicks();
}

/*优化加载图片*/
SDL_Surface * Load_Image(char path[])
{
	SDL_Surface * oldimage=NULL;
	SDL_Surface * newimage=NULL;
	oldimage=IMG_Load(path);
	if (oldimage==NULL)
	{
		exit (ERROR_LOADIMG);
	}
	newimage=SDL_DisplayFormat(oldimage);
	SDL_FreeSurface(oldimage);
	return newimage;
}

/*渲染文字*/
SDL_Surface *Print_Text(char * text)
{
	SDL_Surface * textface;
	textface=TTF_RenderUTF8_Solid(Font,text,Fontcolor);
	if (textface==NULL)
	{
		Error (ERROR_PRINTTEXT);
	}
	return textface;
}

/*设置字体颜色*/
void SetTextColor (unsigned short r,unsigned short g,unsigned short b)
{
	Fontcolor.r=r;
	Fontcolor.g=g;
	Fontcolor.b=b;
}
/*拷贝至表面*/
void CopyToSurface(int x,int y,SDL_Surface * source,SDL_Surface * target,SDL_Rect * cli)
{
	SDL_Rect location;
	location.x=x;
	location.y=y;
	SDL_BlitSurface(source,cli,target,&location);
}
/*加载音乐*/
Mix_Music *Load_Music (char * path)
{
	Mix_Music* music=NULL;
	music=Mix_LoadMUS (path);
	if (music==NULL)
	{
		Error(ERROR_LOADMUSIC);
	}
	return music;
}
/*加载音效*/
Mix_Chunk *Load_Chunk (char * path)
{
	Mix_Chunk * chunk=NULL;
	chunk=Mix_LoadWAV (path);
	if (path==NULL)
	{
		Error (ERROR_LOADCHUNK);
	}
	return chunk;
}
/*获取指针位置*/
void GetMouseLocation (void)
{
	SDL_GetMouseState (&(Mouse.x),&(Mouse.y));
}
/*打印鼠标指针*/
void PrintMouse (void)
{
	/*加载鼠标指针并设置关键色*/
	Uint32 colorkey=SDL_MapRGB( Point->format, 0, 0, 0);
	SDL_SetColorKey(Point,SDL_SRCCOLORKEY,colorkey);
	CopyToSurface (Mouse.x,Mouse.y,Point,Screen,NULL);
}
/*刷新屏幕*/
void Flip_Screen(void)
{
	if ((SDL_GetTicks()-Fps.last_time)<(1000/FRAME_PER_SECOND))
	{
		SDL_Delay (1000/FRAME_PER_SECOND-(SDL_GetTicks()-Fps.last_time));
	}
	Fps.last_time=SDL_GetTicks();
	if (SDL_Flip(Screen)<0)
	{
		Error (ERROR_FLIPSCREEN);
	}
	Frame++;
}
void Set_ScreenColor (unsigned short r,unsigned short g,unsigned short b)//设置背景色
{
	SDL_FillRect(Screen,&(Screen->clip_rect),SDL_MapRGB(Screen->format,r,g,b));
}
/*打印FPS帧率*/
void PrintFPS (void)
{
	char fpsch[10]="FPS:";
	char temp[4];
	int temptime;
	if (Updatefps.last_time==0)
	{
		Updatefps.last_time=SDL_GetTicks();
		return;
	}
	temptime=SDL_GetTicks();
	Updatefps.time+=temptime-Updatefps.last_time;
	Updatefps.last_time=temptime;
	if (Updatefps.time>=1000)
	{
		Updatefps.time=0;
		itoa (Frame,temp,10);
		strcat (fpsch,temp);
		FpsCount=TTF_RenderText_Solid(FPSFont,fpsch,Fontcolor);
		if (FpsCount==NULL)
		{
			Error (ERROR_PRINTTEXT);
		}
		Frame=0;
	}
	if (FpsCount==NULL)
	{
		FpsCount=TTF_RenderText_Solid(FPSFont,"FPS:0",Fontcolor);
		if (FpsCount==NULL)
		{
			Error (ERROR_PRINTTEXT);
		}
	}
	CopyToSurface (WIDTH-FpsCount->w,0,FpsCount,Screen,NULL);
}

/*底层函数*/
char *itoa(int num,char *str,int radix){
//num：int型原数,str:需转换成的string，radix,原进制，
/* 索引表 */
char index[]="0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
unsigned unum;
/* 中间变量 */
 int i=0,j,k;
  /* 确定unum的值 */
  if(radix==10&&num<0){
  	/* 十进制负数 */
  	unum=(unsigned)-num; str[i++]='-'; }
  	else unum=(unsigned)num;/* 其他情况 */ /* 逆序 */ do{ str[i++]=index[unum%(unsigned)radix]; unum/=radix; }while(unum); str[i]='\0'; /* 转换 */ if(str[0]=='-') k=1;/* 十进制负数 */ else k=0; /* 将原来的“/2”改为“/2.0”，保证当num在16~255之间，radix等于16时，也能得到正确结果 */ for(j=k;j<(i-1)/2.0+k;j++){ num=str[j]; str[j]=str[i-j-1+k]; str[i-j-1+k]=num; } return str;
}