Provided by: allegro5-doc_5.2.9.1+dfsg-1.1build4_all 

NAME
al_draw_triangle - Allegro 5 API
SYNOPSIS
#include <allegro5/allegro_primitives.h>
void al_draw_triangle(float x1, float y1, float x2, float y2,
float x3, float y3, ALLEGRO_COLOR color, float thickness)
DESCRIPTION
Draws an outlined triangle.
Parameters:
• x1, y1, x2, y2, x3, y3 - Three points of the triangle
• color - Color of the triangle
• thickness - Thickness of the lines, pass <= 0 to draw hairline lines
SEE ALSO
al_draw_filled_triangle(3alleg5), al_draw_soft_triangle(3alleg5)
Allegro reference manual al_draw_triangle(3alleg5)