Allegro 5 api
#include <allegro5/allegro_primitives.h> void al_draw_spline(float points[8], ALLEGRO_COLOR color, float thickness)
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
al_calculate_spline(3alleg5)