OpenGl绘制长方体

DrawCuboid(double x, double y, double z)
{
//     glPushMatrix();
    double cx = x/2.0;
    double cy = y/2.0;
    double cz = z/2.0;
    glBegin(GL_QUADS);
    // 左面
    glTexCoord2f(0.0f, 0.0f);  glVertex3f(-cx, -cy, -cz);
    glTexCoord2f(1.0f, 0.0f);  glVertex3f(-cx,  cy, -cz);
    glTexCoord2f(1.0f, 1.0f);  glVertex3f(-cx,  cy,  cz);
    glTexCoord2f(0.0f, 1.0f);  glVertex3f(-cx, -cy,  cz);
    // 右面
    glTexCoord2f(0.0f, 0.0f);  glVertex3f(cx, -cy, -cz);
    glTexCoord2f(1.0f, 0.0f);  glVertex3f(cx,  cy, -cz);
    glTexCoord2f(1.0f, 1.0f);  glVertex3f(cx,  cy,  cz);
    glTexCoord2f(0.0f, 1.0f);  glVertex3f(cx, -cy,  cz);
    // 上面
    glTexCoord2f(0.0f, 0.0f);  glVertex3f(-cx, cy, -cz);
    glTexCoord2f(1.0f, 0.0f);  glVertex3f( cx, cy, -cz);
    glTexCoord2f(1.0f, 1.0f);  glVertex3f( cx, cy,  cz);
    glTexCoord2f(0.0f, 1.0f);  glVertex3f(-cx, cy,  cz);
    // 下面
    glTexCoord2f(0.0f, 0.0f);  glVertex3f(-cx, -cy, -cz);
    glTexCoord2f(1.0f, 0.0f);  glVertex3f( cx, -cy, -cz);
    glTexCoord2f(1.0f, 1.0f);  glVertex3f( cx, -cy,  cz);
    glTexCoord2f(0.0f, 1.0f);  glVertex3f(-cx, -cy,  cz);
    // 前面
    glTexCoord2f(0.0f, 0.0f);  glVertex3f(-cx, -cy, -cz);
    glTexCoord2f(1.0f, 0.0f);  glVertex3f( cx, -cy, -cz);
    glTexCoord2f(1.0f, 1.0f);  glVertex3f( cx,  cy, -cz);
    glTexCoord2f(0.0f, 1.0f);  glVertex3f(-cx,  cy, -cz);
    // 后面
    glTexCoord2f(0.0f, 0.0f);  glVertex3f(-cx, -cy, cz);
    glTexCoord2f(1.0f, 0.0f);  glVertex3f( cx, -cy, cz);
    glTexCoord2f(1.0f, 1.0f);  glVertex3f( cx,  cy, cz);
    glTexCoord2f(0.0f, 1.0f);  glVertex3f(-cx,  cy, cz);
    glEnd();

//     glPopMatrix();
    return TRUE;
}
// 跟扩展库的绘制结果相同

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