al_calculate_ribbon(3)  al_calculate_ribbon(3) 
NAME
al_calculate_ribbon  Allegro 5 API
SYNOPSIS

#include <allegro5/allegro_primitives.h> void al_calculate_ribbon(float* dest, int dest_stride, const float *points,
int points_stride, float thickness, int num_segments)
DESCRIPTION
Calculates a ribbon given an array of points. The ribbon will go through all of the passed points. If thickness <= 0, then num_segments of points are required in the destination buffer, otherwise twice as many are needed. The destination and the points buffer should consist of regularly spaced doublets of floats, corresponding to x and y coordinates of the vertices.
Parameters:
 •
 dest  Pointer to the destination buffer
 •
 dest_stride  Distance (in bytes) between starts of successive pairs of coordinates in the destination buffer
 •
 points  An array of pairs of coordinates for each point
 •
 points_stride  Distance (in bytes) between starts of successive pairs of coordinates in the points buffer
 •
 thickness  Thickness of the spline ribbon
 •
 num_segments  The number of points to calculate
SEE ALSO
al_draw_ribbon(3), al_calculate_arc(3), al_calculate_spline(3)
Allegro reference manual 