繪制立方體

glClear(GL_COLOR_BUFFER_BIT);  //清除背景顏色
    glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);   //線框顯示
    //glEnable(GL_DEPTH_TEST);
    glPushMatrix();
    glTranslatef(-4.0f, 3.0f, -10.0f);

    //繪制立方體
    glBegin(GL_QUADS);

    //x
    glColor4ub(200, 0, 0, 255);
    glVertex3f(0.5f, -0.5f, 0.5f);
    glVertex3f(0.5f, -0.5f, -0.5f);
    glVertex3f(0.5f, 0.5f, -0.5f);
    glVertex3f(0.5f, 0.5f, 0.5f);

    //-x
    glVertex3f(-0.5f, -0.5f, -0.5f);
    glVertex3f(-0.5f, -0.5f, 0.5f);
    glVertex3f(-0.5f, 0.5f, 0.5f);
    glVertex3f(-0.5f, 0.5f, -0.5f);

    //y
    glVertex3f(-0.5f, 0.5f, 0.5f);
    glVertex3f(0.5f, 0.5f, 0.5f);
    glVertex3f(0.5f, 0.5f, -0.5f);
    glVertex3f(-0.5f, 0.5f, -0.5f);

    //-y
    glVertex3f(-0.5f, -0.5f, -0.5f);
    glVertex3f(0.5f, -0.5f, -0.5f);
    glVertex3f(0.5f, -0.5f, 0.5f);
    glVertex3f(-0.5f, -0.5f, 0.5f);

    //z
    glVertex3f(-0.5f, -0.5f, 0.5f);
    glVertex3f(0.5f, -0.5f, 0.5f);
    glVertex3f(0.5f, 0.5f, 0.5f);
    glVertex3f(-0.5f, 0.5f, 0.5f);

    //-z
    glVertex3f(0.5f, -0.5f, -0.5f);
    glVertex3f(-0.5f, -0.5f, -0.5f);
    glVertex3f(-0.5f, 0.5f, -0.5f);
    glVertex3f(0.5f, 0.5f, -0.5f);

    glEnd();
    glPopMatrix();
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