Problema com SDL

[liuriloami]

O que há de errado com esse código? Quero criar um bloco, utilizando as teclas p/ aumentar ou diminuir a velocidade do mesmo.

#include <SDL.h>

int main () {
	SDL_Init (SDL_INIT_VIDEO);
	SDL_Surface *tela = NULL;
	tela = SDL_SetVideoMode (800, 600, 32, SDL_ANYFORMAT);
	SDL_WM_SetCaption ("The Simple Block","The Simple Block");
	int quit = 0;
	int vx = 0;
	int vy = 0;
	int x, y;
	x = 400;
	y = 320;
	SDL_Event eventos;
	SDL_Rect retangulo = {x-20, y-20, x+20, y+20};
	SDL_FillRect(tela, &retangulo, 0xFFFFFF);
	SDL_UpdateRects(tela, 1, &retangulo);
	while (!quit) {
		while (SDL_PollEvent(&eventos)) {
			switch (eventos.type) {
				case SDL_QUIT:
					quit = 1;
					break;
				case SDL_KEYDOWN:
					switch (eventos.key.keysym.sym) {
						case SDLK_UP:
							vy += 1;
							break;

						case SDLK_DOWN:
							vy -= 1;
							break;

						case SDLK_LEFT:
							vx -= 1;
							break;

						case SDLK_RIGHT:
							vy -= 1;
							break;			
						}
					}
				x += vx;
				y += vy;
			   SDL_Rect retangulo = {x-20, y-20, x+20, y+20};
				SDL_UpdateRects(tela, 1, &retangulo);
				SDL_Delay (1000);
				}
			}
		SDL_FreeSurface (tela);
		SDL_Quit();
		return 0;
		}

[Mateus José]

Bem amigo, veja se isso ajuda:

#include <SDL.h>

int main () {

SDL_Init (SDL_INIT_VIDEO);

SDL_Surface *tela = NULL;

tela = SDL_SetVideoMode (800, 600, 32, SDL_ANYFORMAT);

SDL_WM_SetCaption ("The Simple Block","The Simple Block");

int quit = 0;

int vx = 0;

int vy = 0;

int x, y;

x = 400;

y = 320;

SDL_Event eventos;

while (!quit) {

while (SDL_PollEvent(&eventos)) {

switch (eventos.type) {

case SDL_QUIT:

quit = 1;

break;

case SDL_KEYDOWN:

switch (eventos.key.keysym.sym) {

case SDLK_UP:

vy -= 1;

break;

case SDLK_DOWN:

vy += 1;

break;

case SDLK_LEFT:

vx -= 1;

break;

case SDLK_RIGHT:

vx += 1;

break;

}

}

}

x += vx;

y += vy;

SDL_Rect fundo={0,0,800,600}; // medidas da tela

SDL_FillRect(tela, &fundo, 0x000000); // limpa a tela

SDL_Rect retangulo={x-20, y-20, 20, 20}; // {x, y, largura,altura}

SDL_FillRect(tela, &retangulo, 0xFFFFFF); // desenha o quadrado

SDL_UpdateRects(tela, 1, &fundo); // atualiza a tela

SDL_Delay (100);

}

SDL_FreeSurface (tela);

SDL_Quit();

return 0;

}