Provided by: allegro5-doc_5.0.10-2_all 

NAME
al_draw_spline - Allegro 5 API
SYNOPSIS
#include <allegro5/allegro_primitives.h>
void al_draw_spline(float points[8], ALLEGRO_COLOR color, float thickness)
DESCRIPTION
Draws a Bézier spline given 4 control points.
Parameters:
• points - An array of 4 pairs of coordinates of the 4 control points
• color - Color of the spline
• thickness - Thickness of the spline, pass <= 0 to draw a hairline spline
SEE ALSO
al_calculate_spline(3alleg5)
Allegro reference manual al_draw_spline(3alleg5)()