Allegro 5 api
#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)
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
al_draw_filled_triangle(3alleg5), al_draw_soft_triangle(3alleg5)