ALLEGRO_LINE_CAP(3alleg5) ALLEGRO_LINE_CAP(3alleg5)

ALLEGRO_LINE_CAP - Allegro 5 API

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

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ALLEGRO_LINE_CAP_NONE
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ALLEGRO_LINE_CAP_SQUARE
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ALLEGRO_LINE_CAP_ROUND
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ALLEGRO_LINE_CAP_TRIANGLE
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ALLEGRO_LINE_CAP_CLOSED [IMAGE: ALLEGRO_LINE_CAP styles] 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