glColor3f(0,0,1); glLineWidth(30);
glBegin(GL_TRIANGLES);
glVertex2d(300,height_screen);
glVertex2d(150,height_screen/2);
glVertex2d(450,height_screen/2);
glVertex2d(150,height_screen);
glColor3f(1,1,0); glLineWidth(3);
glEnd();
glColor3f(1,0,0); glLineWidth(30);
glBegin(GL_TRIANGLES);
glVertex2d(150,150);
glVertex2d(75,75);
glVertex2d(225,150);
glVertex2d(150,225);
glColor3f(1,1,0); glLineWidth(3);
glEnd();