#define INCXSPEED 2
#define INCYSPEED 4
#define XSPEEDMAX 6
#define YSPEEDMAX 12
#define TILESIZE 16 /* Je considère que les tuiles sont carrées. */

enum{
TOP = 0,
RIGHT,
BOTTOM,
LEFT,
};

void check_collision(int x, int y, int where); /* La fonction qui vérifie si il y a une collision ou pas */

int x = 0, y = 0; /* La position du joueur */
int xspeed = 0, yspeed = 0; /* La vitesse du joueur */

void move_player(void){
/* Pour x */
if(keydown(KEY_LEFT) && xspeed > -XSPEEDMAX) xspeed-=INCXSPEED;
else if(keydown(KEY_RIGHT) && xspeed < XSPEEDMAX) xspeed+=INCXSPEED;
else if(xspeed != 0) xspeed+= xspeed > 0 ? -(INCXSPEED/2) : (INCXSPEED/2);
x+=xspeed;
if(xspeed != 0){
  if(xspeed > 0 && check_collision(x, y, RIGHT)){
   xspeed = 0;
   x = x/TILESIZE*TILESIZE;
  }
  if(xspeed < 0 && check_collision(x, y, LEFT)){
   xspeed = 0;
   x = x/TILESIZE*TILESIZE;
  }
}
/* Pour y */
if(keydown(KEY_SHIFT) && check_collision(x, y, BOTTOM)) yspeed = -YSPEEDMAX;
if(yspeed < YSPEEDMAX) yspeed += INCYSPEED;
y += yspeed;
if(yspeed != 0){
  if(yspeed > 0 && check_collision(x, y, BOTTOM)){
   yspeed = 0;
   y = y/TILESIZE*TILESIZE;
  }
  if(yspeed < 0 && check_collision(x, y, TOP)){
   yspeed = 0;
   y = y/TILESIZE*TILESIZE;
  }
}
}