#ifndef SIGN
#define SIGN(a) ((a) < 0 ? -1 : ((a)>0 ? 1 : 0))
#endif
-#define SCROLLX(a) ((a) - scroll_x)
-#define SCROLLY(a) ((a) - scroll_y)
-#define UNSCROLLX(a) ((a) + scroll_x)
-#define UNSCROLLY(a) ((a) + scroll_y)
+#define SCREENX(a) ((a) - scroll_x)
+#define SCREENY(a) ((a) - scroll_y)
+#define LEVELX(a) ((a) + scroll_x)
+#define LEVELY(a) ((a) + scroll_y)
#define IN_SCR_FIELD(x,y) ((x)>=BX1 && (x)<=BX2 && (y)>=BY1 &&(y)<=BY2)
#define IN_LEV_FIELD(x,y) ((x)>=0 && (x)<lev_fieldx && (y)>=0 &&(y)<lev_fieldy)