第一个多边形

void GLWidget::paintGL()
{
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glLoadIdentity();
glTranslatef(-1.5,0.0,-6.0);
glColor3f(1,0,0);
glBegin(GL_TRIANGLES);
glVertex3f(0,1.0,0.0);
glVertex3f(-1.0,-1.0,0.0);
glVertex3f(1.0,-1.0,0.0);
glEnd();

glTranslatef(3.0,0.0,0.0);
glBegin(GL_QUADS);
glVertex3f(-1.0,1.0,0.0);
glVertex3f(1.0,1.0,0.0);
glVertex3f(1.0,-1.0,0.0);
glVertex3f(-1.0,-1.0,0.0);
glEnd();
}