pivot_sprite_v_flip - Rotates and flips a sprite around a specified
point. Allegro game programming library.
#include <allegro.h>
void pivot_sprite_v_flip(BITMAP *bmp, BITMAP *sprite, int x, int y, int
cx, int cy, fixed angle);
Like rotate_sprite_v_flip(), but aligns the point in the sprite given
by (cx, cy) to (x, y) in the bitmap, then rotates around this point.
rotate_sprite(3alleg), rotate_sprite_v_flip(3alleg),
pivot_sprite(3alleg), exsprite(3alleg)