main.cpp

#include <cstdlib>
#include <iostream>
#include <GL/glut.h>

using namespace std;

void desenha(){
     
    glClearColor(0.0,0.0,0.0,0.0);
    glClear(GL_COLOR_BUFFER_BIT);
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    glOrtho(0,256,0,256,-1,1);
    glColor3f(1.0,0.0,0.0);
    
    //Desenhando a borda
    glBegin(GL_POLYGON);
    glVertex2i(91,157);
    glVertex2i(135,81);
    glVertex2i(102,81);
    glVertex2i(102,16);
    glVertex2i(80,16);
    glVertex2i(79,83);
    glVertex2i(49,83);
    glEnd();
    
    //Desenhando o triangulo
    glColor3f(0.0,1.0,0.0);
    glBegin(GL_POLYGON);
    glVertex2i(90,156);
    glVertex2i(134,82);
    glVertex2i(101,82);
    glVertex2i(101,18);
    glVertex2i(78,18);
    glVertex2i(78,82);
    glVertex2i(48,82);
    glEnd();
    glFlush();

}

int main(int argc, char *argv[])
{
    glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);
    glutCreateWindow("Desenhe pontos");
    glutDisplayFunc(desenha);
    glutMainLoop();
    system("PAUSE");
    return EXIT_SUCCESS;
}