spline - Draws a Bezier spline using four control points. Allegro game
programming library.
#include <allegro.h>
void spline(BITMAP *bmp, const int points[8], int color);
Draws a Bezier spline using the four control points specified in the
points array. Read the description of calc_spline() for information on
how to build the points array.
calc_spline(3alleg), drawing_mode(3alleg), makecol(3alleg),
exspline(3alleg)