SDL图片浏览

#include "SDL.h"
#include "SDL_ttf.h"
#include "SDL_rotozoom.h"
#include "SDL_image.h"
#include "math.h"
#include "string.h"
#include "SDL_gfxPrimitives.h"

#define MAX  16
#define BMP_NAME "icon.bmp"
#define ICON "sample.bmp"
#define TITLE_NAME "TestSDL"
#define ICON_NAME  "My WinFrame"		//窗体最小化name


#define TEXT "欢迎光临"				//文字设置
#define TEXT_SIZE 50				//设置字体大小

#define WIDTH  640
#define HEIGTH 480

char *picture[] = {
		  "1.jpg"  ,  "2.jpg"  ,  "3.jpg"  ,  "4.jpg" , 
		  "5.jpg"  ,  "6.jpg"  ,  "7.jpg"  ,  "8.jpg" ,
		  "9.jpg"  ,  "10.jpg" ,  "11.jpg" ,  "12.jpg" ,
		  "13.png" ,  "14.jpg" ,  "15.jpg" ,  "16.jpg"
		  };
static SDL_Surface *screen = NULL;
static	SDL_Surface *backpng = NULL;
static	SDL_Surface *png = NULL;
	
static double zoomXY = 1.5;
static int i = 0;


int Init()						//初始化SDL
{
	if((SDL_Init(SDL_INIT_VIDEO)|IMG_Init(IMG_INIT_PNG)|TTF_Init()) == -1)
	{
		fprintf(stderr,"SDL init error:%s",SDL_GetError());
		return -1;
	}
	return 0;
}

SDL_Surface *loadBMP(char *fileName)			//加载bmp图片
{
	SDL_Surface *bmp;
	bmp = SDL_LoadBMP(fileName);
	if(bmp == NULL)
	{
		fprintf(stderr,"Could not load %s: %s",fileName,SDL_GetError());
		exit(1);
	}
	return bmp;
}

void creatScreen(int width , int height , int bpp , Uint32 flags)		//创建一个VideoMode
{
	screen = SDL_SetVideoMode(width , height,  bpp , flags);
	if(screen == NULL)
	{
		fprintf(stderr,"Could not Creat a Screen!:%s",SDL_GetError());
		exit(1);
	}
	return ;
}

void show_Pic(SDL_Surface *bmp ,SDL_Rect *rect)	//显示bmp图片
{
	SDL_BlitSurface(bmp , NULL , screen , rect);
	SDL_UpdateRect(screen , 0 , 0 , 0 , 0 );
	SDL_FreeSurface(bmp);
	return ;
}

int getRightPic(int a)
{
	
	a++;
	if(a > 15 )
	{
		a = 0;
	}
	return a; 
}
int  getLeftPic(int a)
{
	a--;
	if(a < 0)
	{
		a = 15;
	}
	return a; 
}
void zoomBig(double *a)
{	
	*a -= 0.25;
	if(*a <= 1.5)
	{
		*a = 1.5;
	}
	
}
void zoomSmall(double *a)
{

	*a += 0.25;	
	if(*a >= 5)
	{
		*a = 5;
	}	
}
int mytext(char *string , int size , SDL_Rect *rect)
{
		
	SDL_Rect text_rect;
	//double zoomx , zoomy;
	
	SDL_Color color = {0 , 0 , 0};
	TTF_Font  *font = TTF_OpenFont("simfang.ttf", size);	
	if(font == NULL)
	{
		fprintf( stderr, "font open failed: %s\n",TTF_GetError()  );
		exit(1);

	}
	SDL_Surface  *text = TTF_RenderUTF8_Solid(font , string  , color );
	if(text == NULL)
	{
		fprintf(stderr , "text failed: %s\n" , TTF_GetError() );
	}
	
	/*
	//将字体缩放到按钮的大小，但是字体显得不是那么圆润。
	zoomx = (double)((double)rect->w / (double)text->w);
	zoomy = (double)((double)rect->h / (double)text->h);
	printf("%lf\n" , zoomy);
	text = zoomSurface(text, zoomx, zoomy, 1);
	*/
	
	//将字体放在按钮的中间位置
	text_rect.x =rect->x+(rect->w / 2 -text->w / 2);
	text_rect.y = rect->y + (rect->h / 2 - text->h /2);
	
	show_Pic(text , &text_rect);
	//SDL_FreeSurface(text);
	TTF_CloseFont(font);
		
	return 0;
}
void draw_button(char *str , int flag)
{	
	SDL_Rect myrect;
	if(strcmp(str , "left") == 0)
	{
		
		myrect.x = 160 ;
		myrect.y = 420 ; 
		myrect.w = 40;
		myrect.h = 40;
		boxColor(screen, myrect.x , myrect.y , myrect.x + myrect.w , myrect.y + myrect.h, 0xf3f5ffff);
		if(flag == 1)
		{
			hlineColor( screen, myrect.x , myrect.x + myrect.w , myrect.y + myrect.h , 0x000000ff);
			vlineColor( screen, myrect.x + myrect.w , myrect.y , myrect.y + myrect.h , 0x000000ff);
		}
		mytext("<<" , 20 , &myrect);
	}
	if(strcmp(str , "right") == 0)
	{	
		
		myrect.x = 438;
		myrect.y = 420;
		myrect.w = 40;
		myrect.h = 40;
		boxColor(screen, myrect.x , myrect.y , myrect.x + myrect.w , myrect.y + myrect.h, 0xf3f5ffff);
		if(flag == 1)
		{
			hlineColor( screen, myrect.x , myrect.x + myrect.w , myrect.y + myrect.h , 0x000000ff);
			vlineColor( screen, myrect.x + myrect.w , myrect.y , myrect.y + myrect.h , 0x000000ff);
		}
		mytext(">>" , 20 , &myrect);
	}
	if(strcmp(str , "big") == 0)
	{
		myrect.x = 160;
		myrect.y = 20;
		myrect.w = 40;
		myrect.h = 40;
		boxColor(screen, myrect.x , myrect.y , myrect.x + myrect.w , myrect.y + myrect.h, 0xf3f5ffff);
		if(flag == 1)
		{
			hlineColor( screen, myrect.x , myrect.x + myrect.w , myrect.y + myrect.h , 0x000000ff);
			vlineColor( screen, myrect.x + myrect.w , myrect.y , myrect.y + myrect.h , 0x000000ff);
		}
		mytext("+" , 20 , &myrect);
	}
	if(strcmp(str , "small") == 0)
	{
		myrect.x = 438;
		myrect.y = 20;
		myrect.w = 40;
		myrect.h = 40;
		boxColor(screen, myrect.x , myrect.y , myrect.x + myrect.w , myrect.y + myrect.h, 0xf3f5ffff);
		if(flag == 1)
		{
			hlineColor( screen, myrect.x , myrect.x + myrect.w , myrect.y + myrect.h , 0x000000ff);
			vlineColor( screen, myrect.x + myrect.w , myrect.y , myrect.y + myrect.h , 0x000000ff);
		}
		mytext("-" , 20 , &myrect);
	}
	show_Pic( screen , &(screen->clip_rect));
	return ;
}
int ShowPic(char *string)
{
	double zoom_x,zoom_y;
	SDL_Rect fillRect;
	
	fillRect.x = 107;
	fillRect.y = 80;
	fillRect.w = 426;
	fillRect.h = 320;
	if(strcmp(string , "left") == 0)
	{	
		i = getLeftPic(i);	
	}
	else
		i = getRightPic(i);
	backpng = IMG_Load(picture[i]);
	if(!backpng)
	{
		fprintf(stderr,"Could not load %s: %s\n",picture[i],SDL_GetError());
		exit(1);	
	}
	zoom_x = (double)((screen->w) / (double)(backpng->w));
	zoom_y = (double)((screen->h) / (double)(backpng->h));
	
	png = zoomSurface(backpng , (zoom_x / zoomXY), (zoom_y / zoomXY) , 1);
	SDL_Rect rect;
	rect.x =  (screen->w - png->w ) / 2;
	rect.y =  (screen->h - png->h ) / 2;
				
	rect.w = png->w;
	rect.h = png->h;
	printf("%d , %d , %d , %d\n" , rect.x, rect.y, rect.w , rect.h );
	SDL_FillRect(screen ,&fillRect , 0xffffffff);
	SDL_UpdateRect(screen , 0 , 0 , 0 , 0 );
	show_Pic(png , &rect);
	SDL_FreeSurface(backpng);
					
	return 0;
}
int getNowPic()
{
	double zoom_x,zoom_y;
	SDL_Rect fillRect;
	
	fillRect.x = 107;
	fillRect.y = 80;
	fillRect.w = 426;
	fillRect.h = 320;
		
	backpng = IMG_Load(picture[i]);
	if(!backpng)
	{
		fprintf(stderr,"Could not load %s: %s\n",picture[i],SDL_GetError());
		exit(1);	
	}
	zoom_x = (double)((screen->w) / (double)(backpng->w));
	zoom_y = (double)((screen->h) / (double)(backpng->h));
	
	png = zoomSurface(backpng , (zoom_x / zoomXY), (zoom_y / zoomXY) , 1);
	SDL_Rect rect;
	rect.x =  (screen->w - png->w ) / 2;
	rect.y =  (screen->h - png->h ) / 2;
				
	rect.w = png->w;
	rect.h = png->h;
	printf("%d , %d , %d , %d\n" , rect.x, rect.y, rect.w , rect.h );
	SDL_FillRect(screen ,&fillRect , 0xffffffff);
	SDL_UpdateRect(screen , 0 , 0 , 0 , 0 );
	show_Pic(png , &rect);
	SDL_FreeSurface(backpng);
}
int chooseButton(char *string)
{	
	
	draw_button(string , 1) ;
	ShowPic(string);
		
	return 0;
}
int do_Button(SDL_Event *event)
{
	if((((event->button).x >= 160) && ((event->button).x <= 200 )) && (((event->button).y >= 420) && ((event->button).y <= 460 )))
	{
		chooseButton("left");
	}
	if( ((event->button).x >= 438 && (event->button).x <= 478 ) && ((event->button).y >= 420 && (event->button).y <= 460 ) )
	{
		chooseButton("right");
	}
	if( ((event->button).x >= 160 && (event->button).x <= 200 ) && ((event->button).y >= 20 && (event->button).y <= 60 ) )
	{
		zoomBig(&zoomXY);
		draw_button("big" , 1) ;
		getNowPic();
		
	}
	if( ((event->button).x >= 438 && (event->button).x <= 478 ) && ((event->button).y >= 20 && (event->button).y <= 60 ) )
	{
		zoomSmall(&zoomXY);
		draw_button("small" , 1) ;
		getNowPic();
	}
	return 0;
}
int background()
{
	double zoom_x , zoom_y;
	backpng = IMG_Load(picture[0]);
	if(!backpng)
	{
		fprintf(stderr,"Could not load %s: %s\n",picture[0],SDL_GetError());
		exit(1);	
	}
	zoom_x = (double)((screen->w) / (double)(backpng->w));
	zoom_y = (double)((screen->h) / (double)(backpng->h));

	png = zoomSurface(backpng , zoom_x , zoom_y , 1);
	show_Pic(png ,&(screen->clip_rect));
	SDL_FreeSurface(backpng);
	return 0;
}

int appMode()
{
	
	int width = WIDTH;
	int heigth = HEIGTH;
	int bpp = 0;

	Init();
	creatScreen(width , heigth, bpp , SDL_SWSURFACE);

	background();
	SDL_WM_SetCaption(TITLE_NAME, ICON_NAME);				//设置窗口标题
	SDL_WM_SetIcon(loadBMP(ICON) , NULL);	
	
	return 0;
}
int appEvent()
{
	
	double zoom_x,zoom_y;
	SDL_Event event;

	while(SDL_WaitEvent(&event))			
	{	
		switch(event.type)
		{
			case SDL_KEYDOWN:
				printf("Key Down......\n");
				if(event.key.keysym.sym == SDLK_ESCAPE)
				{
					goto loop;
				}
				if(event.key.keysym.sym == SDLK_SPACE)
				{
					background();		
				}	
				break;
				case SDL_KEYUP:
					/*
					*keyborad test
					*/
					printf("Key up......\n");
					printf("key : %d\n" , event.key.keysym.sym );
					if(event.key.keysym.sym == 269)
					{
						zoomSmall(&zoomXY);	
						getNowPic();				
					}
					if(event.key.keysym.sym == 270)
					{
						zoomBig(&zoomXY);
						getNowPic();
					}
					break;
				case SDL_MOUSEMOTION:

					break;
				case SDL_MOUSEBUTTONDOWN:
					draw_button("big" , 0);
					draw_button("small" , 0);
					draw_button("left" , 0) ;
					draw_button("right" , 0) ; 
					
					
					do_Button(&event);
					
					break;
				case SDL_MOUSEBUTTONUP:	
					draw_button("left" , 0) ;
					draw_button("right" , 0) ;
					draw_button("big" , 0);
					draw_button("small" , 0);
					break;
				case SDL_QUIT:
					printf("quit\n");
					goto loop;
					break;
			}
		}
loop:
	IMG_Quit();
	SDL_FreeSurface(screen);
	SDL_Quit();		
	return 0;
}

int main(int argc,char **argv)
{
	appMode();
	appEvent();		
	return 0;
}