Rotates a sprite around a specified point. allegro game programming library.
#include <allegro.h>
void pivot_sprite(BITMAP *bmp, BITMAP *sprite, int x, int y, int cx, int cy, fixed angle);
Like rotate_sprite(), but aligns the point in the sprite given by (cx, cy) to (x, y) in the bitmap, then rotates around this point.
rotate_sprite(3alleg4), pivot_scaled_sprite(3alleg4), pivot_sprite_v_flip(3alleg4), exsprite(3alleg4)