al_calculate_spline(3)  al_calculate_spline(3) 
NAME
al_calculate_spline  Allegro 5 APISYNOPSIS

#include <allegro5/allegro_primitives.h> void al_calculate_spline(float* dest, int stride, float points[8], float thickness, int num_segments)
DESCRIPTION
Calculates a Bézier spline given 4 control points. If thickness <= 0, then num_segments of points are required in the destination, otherwise twice as many are needed. The destination buffer should consist of regularly spaced (by distance of stride bytes) doublets of floats, corresponding to x and y coordinates of the vertices.Parameters:
 •
 dest  The destination buffer
 •
 stride  Distance (in bytes) between starts of successive pairs of coordinates
 •
 points  An array of 4 pairs of coordinates of the 4 control points
 •
 thickness  Thickness of the spline ribbon
 •
 num_segments  The number of points to calculate
SEE ALSO
al_draw_spline(3), al_calculate_arc(3), al_calculate_ribbon(3)Allegro reference manual 