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/*This source code copyrighted by Lazy Foo' Productions (2004-2009) and may not
be redestributed without written permission.*/
//The headers
#include "SDL.h"
#include "SDL_image.h"
#include "SDL_ttf.h"
#include <string>
//Screen attributes
const int SCREEN_WIDTH = 640;
const int SCREEN_HEIGHT = 480;
const int SCREEN_BPP = 32;
//The surfaces
SDL_Surface *background = NULL;
SDL_Surface *upMessage = NULL;
SDL_Surface *downMessage = NULL;
SDL_Surface *leftMessage = NULL;
SDL_Surface *rightMessage = NULL;
SDL_Surface *message = 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;
//The font
TTF_Font *font = NULL;
//The color of the font
SDL_Color textColor = { 0, 0, 0 };
//Get the keystates
Uint8 *keystates = SDL_GetKeyState( NULL );
SDL_Surface *load_image( std::string filename )
{
//The image that's loaded
SDL_Surface* loadedImage = NULL;
//The optimized surface that will be used
SDL_Surface* optimizedImage = NULL;
//Load the image
loadedImage = IMG_Load( filename.c_str() );
//If the image loaded
if( loadedImage != NULL )
{
//Create an optimized surface
optimizedImage = SDL_DisplayFormat( loadedImage );
//Free the old surface
SDL_FreeSurface( loadedImage );
//If the surface was optimized
if( optimizedImage != NULL )
{
//Color key surface
SDL_SetColorKey( optimizedImage, SDL_SRCCOLORKEY, SDL_MapRGB( optimizedImage->format, 0, 0xFF, 0xFF ) );
}
}
//Return the optimized surface
return optimizedImage;
}
void apply_surface( int x, int y, SDL_Surface* source, SDL_Surface* destination, SDL_Rect* clip = NULL )
{
//Holds offsets
SDL_Rect offset;
//Get offsets
offset.x = x;
offset.y = y;
//Blit
SDL_BlitSurface( source, clip, 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;
}
//Initialize SDL_ttf
if( TTF_Init() == -1 )
{
return false;
}
//Set the window caption
SDL_WM_SetCaption( "Press an Arrow Key", NULL );
//If everything initialized fine
return true;
}
bool load_files()
{
//Load the background image
background = load_image( "background.png" );
//Open the font
font = TTF_OpenFont( "lazy.ttf", 60 );
//If there was a problem in loading the background
if( background == NULL )
{
return false;
}
//If there was an error in loading the font
if( font == NULL )
{
return false;
}
//If everything loaded fine
return true;
}
void clean_up()
{
//Free the surfaces
SDL_FreeSurface( background );
SDL_FreeSurface( upMessage );
SDL_FreeSurface( downMessage );
SDL_FreeSurface( leftMessage );
SDL_FreeSurface( rightMessage );
//Close the font
TTF_CloseFont( font );
//Quit SDL_ttf
TTF_Quit();
//Quit SDL
SDL_Quit();
}
int main( int argc, char* args[] )
{
//Quit flag
bool quit = false;
//Initialize
if( init() == false )
{
return 1;
}
//Load the files
if( load_files() == false )
{
return 1;
}
//Generate the message surfaces
upMessage = TTF_RenderText_Solid( font, "Up was pressed.", textColor );
downMessage = TTF_RenderText_Solid( font, "Down was pressed.", textColor );
leftMessage = TTF_RenderText_Solid( font, "Left was pressed", textColor );
rightMessage = TTF_RenderText_Solid( font, "Right was pressed", textColor );
//Apply the background
apply_surface( 0, 0, background, screen );
//While the user hasn't quit
while( quit == false )
{
//If there's an event to handle
if( SDL_PollEvent( &event ) )
{
//If up is pressed
if( keystates[ SDLK_UP ] ) {
apply_surface( ( SCREEN_WIDTH - up->w ) / 2, ( SCREEN_HEIGHT / 2 - up->h ) / 2, up, screen );
}
//If down is pressed
if( keystates[ SDLK_DOWN ] ) {
apply_surface( ( SCREEN_WIDTH - down->w ) / 2, ( SCREEN_HEIGHT / 2 - down->h ) / 2 + ( SCREEN_HEIGHT / 2 ), down, screen );
}
//If left is pressed
if( keystates[ SDLK_LEFT ] ) {
apply_surface( ( SCREEN_WIDTH / 2 - left->w ) / 2, ( SCREEN_HEIGHT - left->h ) / 2, left, screen );
}
//If right is pressed
if( keystates[ SDLK_RIGHT ] ) {
apply_surface( ( SCREEN_WIDTH / 2 - right->w ) / 2 + ( SCREEN_WIDTH / 2 ), ( SCREEN_HEIGHT - right->h ) / 2, right, screen );
}
//Update the screen
if( SDL_Flip( screen ) == -1 ) {
return 1;
}
//If a key was pressed
if( event.type == SDL_KEYDOWN )
{
//Set the proper message surface
switch( event.key.keysym.sym )
{
case SDLK_UP: message = upMessage; break;
case SDLK_DOWN: message = downMessage; break;
case SDLK_LEFT: message = leftMessage; break;
case SDLK_RIGHT: message = rightMessage; break;
}
}
//If the user has Xed out the window
else if( event.type == SDL_QUIT )
{
//Quit the program
quit = true;
}
}
//If a message needs to be displayed
if( message != NULL )
{
//Apply the background to the screen
apply_surface( 0, 0, background, screen );
//Apply the message centered on the screen
apply_surface( ( SCREEN_WIDTH - message->w ) / 2, ( SCREEN_HEIGHT - message->h ) / 2, message, screen );
//Null the surface pointer
message = NULL;
}
//Update the screen
if( SDL_Flip( screen ) == -1 )
{
return 1;
}
}
//Clean up
clean_up();
return 0;
}
"SDLtest 2.exe has encountered a problem and needs to close. We are sorry for the inconvenience."
