calc_spline(3alleg4)						  Allegro manual					      calc_spline(3alleg4)

NAME

       calc_spline - Calculates a series of values along a Bezier spline. Allegro game programming library.

SYNOPSIS

       #include <allegro.h>

       void calc_spline(const int points[8], int npts, int *x, int *y);

DESCRIPTION

       Calculates  a  series of npts values along a Bezier spline, storing them in the output x and y arrays. The Bezier curve is specified by the
       four x/y control points in the points array: points[0] and points[1] contain the coordinates of the  first  control  point,  points[2]  and
       points[3]  are  the second point, etc. Control points 0 and 3 are the ends of the spline, and points 1 and 2 are guides. The curve probably
       won't pass through points 1 and 2, but they affect the shape of the curve between points 0 and 3 (the lines p0-p1 and p2-p3 are tangents to
       the  spline).  The  easiest  way to think of it is that the curve starts at p0, heading in the direction of p1, but curves round so that it
       arrives at p3 from the direction of p2.	In addition to their role as graphics primitives, spline curves can  be  useful  for  constructing
       smooth paths around a series of control points, as in exspline.c.

SEE ALSO

       spline(3alleg4), exspline(3alleg4)

Allegro 							   version 4.4.2					      calc_spline(3alleg4)