DOKK / manpages / debian 11 / allegro5-doc / ALLEGRO_LINE_CAP.3alleg5.en
ALLEGRO_LINE_CAP(3alleg5) ALLEGRO_LINE_CAP(3alleg5)

ALLEGRO_LINE_CAP - Allegro 5 API

#include <allegro5/allegro_primitives.h>
typedef enum ALLEGRO_LINE_CAP
    

ALLEGRO_LINE_CAP_NONE
ALLEGRO_LINE_CAP_SQUARE
ALLEGRO_LINE_CAP_ROUND
ALLEGRO_LINE_CAP_TRIANGLE
ALLEGRO_LINE_CAP_CLOSED

[IMAGE: ALLEGRO_LINE_CAP styles]

See the picture for the difference.

ALLEGRO_LINE_CAP_CLOSED is different from the others - it causes the polygon to have no caps. (And the ALLEGRO_LINE_JOIN(3alleg5) style will determine how the vertex looks.)

5.1.0

al_draw_polygon(3alleg5)

Allegro reference manual