static bool isLeftPressed = false;
static bool isRightPressed = false;
// etc
while(SDL_PollEvent(&event))
{
if(event.type == SDL_KEYDOWN)
{
switch(event.key.keysm.sym)
{
case SDLK_LEFT: isLeftPressed = true; break;
case SDLK_RIGHT: isRightPressed = true; break;
// etc
}
}
else if(event.type == SDL_KEYUP)
{
switch(event.key.keysm.sym)
{
case SDLK_LEFT: isLeftPressed = false; break;
case SDLK_RIGHT: isRightPressed = false; break;
// etc
}
}
}
if(isLeftPressed)
{
// ...
}
if(isRightPressed)
{
// ...
}
didnt work maybe I have some problems in my whole code...
#include "SDL/SDL.h"
#include "SDL/SDL_image.h"
#include <string>
const int SCREEN_WIDTH = 300;
const int SCREEN_HEIGHT = 300;
const int SCREEN_BPP = 32;
const int FRAMES_PER_SECOND = 10;
const int DOT_WIDTH = 12;
const int DOT_HEIGHT = 12;
SDL_Surface *block = NULL;
SDL_Surface *background = NULL;
SDL_Surface *screen = NULL;
SDL_Event event;
class Timer
{
private:
int startTicks;
int pausedTicks;
bool paused;
bool started;
public:
Timer();
void start();
void stop();
void pause();
void unpause();
int get_ticks();
bool is_started();
bool is_paused();
};
SDL_Surface *load_image( std::string filename ) {
SDL_Surface* loadedImage = NULL;
SDL_Surface* optimizedImage = NULL;
loadedImage = IMG_Load( filename.c_str() );
if( loadedImage != NULL ) {
optimizedImage = SDL_DisplayFormat( loadedImage );
SDL_FreeSurface( loadedImage );
if( optimizedImage != NULL) {
Uint32 colorkey = SDL_MapRGB( optimizedImage->format, 53, 255, 255 );
SDL_SetColorKey( optimizedImage, SDL_SRCCOLORKEY, colorkey );
}
}
return optimizedImage;
}
void apply_surface( int x, int y, SDL_Surface* source, SDL_Surface* destination) {
SDL_Rect offset;
offset.x = x;
offset.y = y;
SDL_BlitSurface( source, NULL, destination, &offset );
}
bool init() {
if( SDL_Init( SDL_INIT_EVERYTHING ) == -1 ) {
return false;
}
screen = SDL_SetVideoMode( SCREEN_WIDTH, SCREEN_HEIGHT, SCREEN_BPP, SDL_SWSURFACE );
if( screen == NULL ) {
return false;
}
SDL_WM_SetCaption( "Project", NULL );
return true;
}
bool load_files() {
background = load_image( "Background.png" );
block = load_image( "block.png" );
if( (background == NULL)||(block == NULL)) {
return false;
}
return true;
}
void clean_up() {
SDL_FreeSurface( background );
SDL_FreeSurface( block );
SDL_Quit();
}
Timer::Timer()
{
startTicks = 0;
pausedTicks = 0;
paused = false;
started = false;
}
void Timer::start()
{
started = true;
paused = false;
startTicks = SDL_GetTicks();
}
void Timer::stop()
{
started = false;
paused = false;
}
void Timer::pause()
{
if( ( started == true ) && ( paused == false ) )
{
paused = true;
pausedTicks = SDL_GetTicks() - startTicks;
}
}
void Timer::unpause()
{
if( paused == true )
{
paused = false;
startTicks = SDL_GetTicks() - pausedTicks;
pausedTicks = 0;
}
}
int Timer::get_ticks()
{
if( started == true )
{
if( paused == true )
{
return pausedTicks;
}
else
{
return SDL_GetTicks() - startTicks;
}
}
return 0;
}
bool Timer::is_started()
{
return started;
}
bool Timer::is_paused()
{
return paused;
}
int main( int argc, char* args[] ) {
int x,y;
static bool isLeftPressed = false;
static bool isRightPressed = false;
static bool isUpPressed = false;
static bool isDownPressed = false;
bool quit = false;
int frame = 0;
bool cap = true;
Timer fps;
x = 140;
y = 140;
if( init() == false ) {
return 1;
}
if( load_files() == false ) {
return 1;
}
while( quit == false ) {
fps.start();
while( SDL_PollEvent( &event ) ) {
if(event.type == SDL_KEYDOWN)
{
switch(event.key.keysym.sym) {
case SDLK_UP: isUpPressed = true; break;
case SDLK_DOWN: isDownPressed = true; break;
case SDLK_RIGHT: isRightPressed = true; break;
case SDLK_LEFT: isLeftPressed = true; break;
}
}
else if(event.type == SDL_KEYUP)
{
switch(event.key.keysym.sym) {
case SDLK_UP: isUpPressed = false; break;
case SDLK_DOWN: isDownPressed = false; break;
case SDLK_RIGHT: isRightPressed = false; break;
case SDLK_LEFT: isLeftPressed = false; break;
}
}
if( event.type == SDL_QUIT ) {
quit = true;
}
}
if(isLeftPressed)
{
x -= 1;
}
if(isUpPressed)
{
y -= 1;
}
if(isRightPressed)
{
x += 1;
}
if(isDownPressed)
{
y += 1;
}
apply_surface( 0, 0, background, screen );
apply_surface( x, y, block, screen );
if( SDL_Flip( screen ) == -1 ) {
return 1;
}
frame++;
if( ( cap == true ) && ( fps.get_ticks() < 1000 / FRAMES_PER_SECOND ) )
{
SDL_Delay( ( 1000 / FRAMES_PER_SECOND ) - fps.get_ticks() );
}
}
clean_up();
return 0;
}
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