俄罗斯方块制作

#include "SDL/SDL.h"
#include "SDL/SDL_image.h"
#include <string>
#include <conio.h>
#include <stdlib.h>
const int SCREEN_WIDTH = 1000;
const int SCREEN_HEIGHT = 1000;
const int SCREEN_BPP = 32;
//The surfaces
SDL_Surface *image = NULL;
SDL_Surface *screen = NULL;
SDL_Surface *up = NULL;
SDL_Surface *down = NULL;
SDL_Surface *left = NULL;
SDL_Surface *right = NULL;
//The event structure
SDL_Event event;
SDL_Surface *load_image( std::string filename )
{
//The image that's loaded
SDL_Surface* loadedImage = NULL;
//The optimized image that will be used
SDL_Surface* optimizedImage = NULL;
//Load the image using SDL_image
loadedImage = IMG_Load( filename.c_str() );
//If the image loaded
if( loadedImage != NULL )
{
//Create an optimized image
optimizedImage = SDL_DisplayFormat( loadedImage );
//Free the old image
SDL_FreeSurface( loadedImage );
}
//Return the optimized image
return optimizedImage;
}

void apply_surface( int x, int y, SDL_Surface* source, SDL_Surface* destination )
{
//Rectangle to hold the offsets
SDL_Rect offset;
//Get offsets
offset.x = x;
offset.y = y;
//Blit the surface
SDL_BlitSurface( source, NULL, destination, &offset );
}
bool init()
{
//Initialize all SDL subsystems
if( SDL_Init( SDL_INIT_EVERYTHING ) == -1 )
{
return false;
}
//Set up the screen
screen = SDL_SetVideoMode( SCREEN_WIDTH, SCREEN_HEIGHT, SCREEN_BPP, SDL_SWSURFACE );
//If there was an error in setting up the screen
if( screen == NULL )
{
return false;
}
//Set the window caption
SDL_WM_SetCaption( "PNG test", NULL );
//If everything initialized fine
return true;
}
void clean_up()
{
//Free the surface
SDL_FreeSurface( image );
//Quit SDL
SDL_Quit();
}
int main( int argc, char* args[] )
{int x=500;
int y=0;
//Initialize
if( init() == false )
{
return

1;
}
while(1)
{int b;
b=rand()%3;
if(b=1){
while(1){
//Fill the screen white
SDL_FillRect( screen, &screen->clip_rect, SDL_MapRGB( screen->format, 0xFF, 0xFF, 0xFF ) );
image = load_image( "样板1.png" );
apply_surface( x, y, image, screen );
y=y+50;
//获取按键状态
Uint8 *keystates = SDL_GetKeyState( NULL );
//如果"左方向键"被按下
if( keystates[ SDLK_LEFT ] )
{x=x-50;
image = load_image( "样板1.png" );
apply_surface( x, y, image, screen );
if(x<0)
x=0;
}
//如果"右方向键"被按下
if( keystates[ SDLK_RIGHT ] )
{x=x+50;
if(x>1000)
x=1000;
image = load_image( "样板1.png" );
apply_surface( x, y, image, screen);
}
SDL_FreeSurface( image );
SDL_FreeSurface( screen);
//更新窗口
if( SDL_Flip( screen ) == -1 )
{
retur

d 1;
}
SDL_Delay( 300);
if(y>960)
y=0;
}}
if(b=2){
while(1){
//Fill the screen white
SDL_FillRect( screen, &screen->clip_rect, SDL_MapRGB( screen->format, 0xFF, 0xFF, 0xFF ) );
image = load_image( "样板2.png" );
apply_surface( x, y, image, screen );
y=y+50;
//获取按键状态
Uint8 *keystates = SDL_GetKeyState( NULL );
//如果"左方向键"被按下
if( keystates[ SDLK_LEFT ] )
{x=x-50;
image = load_image( "样板2.png" );
apply_surface( x, y, image, screen );
if(x<0)
x=0;
}
//如果"右方向键"被按下
if( keystates[ SDLK_RIGHT ] )
{x=x+50;
if(x>1000)
x=1000;
image = load_image( "样板2.png" );
apply_surface( x, y, image, screen);
}
SDL_FreeSurface( image );
SDL_FreeSurface( screen

);
//更新窗口
if( SDL_Flip( screen ) == -1 )
{
return 1;
}
SDL_Delay( 300);
if(y>960)
y=0;
}}
if(b=3){
while(1){
//Fill the screen white
SDL_FillRect( screen, &screen->clip_rect, SDL_MapRGB( screen->format, 0xFF, 0xFF, 0xFF ) );
image = load_image( "样板3.png" );
apply_surface( x, y, image, screen );
y=y+50;
//获取按键状态
Uint8 *keystates = SDL_GetKeyState( NULL );
//如果"左方向键"被按下
if( keystates[ SDLK_LEFT ] )
{x=x-50;
image = load_image( "样板3.png" );
apply_surface( x, y, image, screen );
if(x<0)
x=0;
}
//如果"右方向键"被按下
if( keystates[ SDLK_RIGHT ] )
{x=x+50;
if(x>1000)
x=1000;
break;
image = load_image( "样板3.png" );
apply_surface(

x, y, image, screen);
}
SDL_FreeSurface( image );
SDL_FreeSurface( screen);
//更新窗口
if( SDL_Flip( screen ) == -1 )
{
return 1;
}
SDL_Delay( 300);
if(y>960)
y=0;
}}
}
//Wait 2 seconds
SDL_Delay( 2000 );
//Free the surface and quit SDL
clean_up();
return 0;
}

有个很大问题，到底后会被白色填充而消失

哪位大神告诉我如何解决

有个地方复制过来时错了

第四页是 n 1;

求回复

没学过SDL，你进度怎样，方块能自动下降吗，还是只能手动控制