Pygame Rect 对象的 .width 和 .w 属性有什么区别？答案

【问题标题】：What's the difference between the .width and .w attribute of a Pygame Rect object?Pygame Rect 对象的 .width 和 .w 属性有什么区别？
【发布时间】：2015-06-24 11:47:13
【问题描述】：

官方pygame documentation 声明有几个虚拟属性可用于移动和对齐pygame.Rect 实例：

直到现在我分别使用myRect.w 和myRect.h 来确定@987654326@ 对象的宽度或高度。但是为了完成这个图形，我遇到了 .width 和 .height 属性。

有趣的是，这两个属性似乎都为我们提供了相同的日期，您可以在以下代码清单中看到：

>>> myRect = pygame.Rect((10, 20), (200,100)) #create a new Rect instance
>>> myRect.w
200
>>> myRect.width
200
>>> myRect.size
(200, 100)

现在这两个属性对有什么区别？

【问题讨论】：

标签： pygame rect

【解决方案1】：

没有区别。你可以看看Rect类的source：

static PyGetSetDef rect_getsets[] = {
    { "x", (getter)rect_getleft, (setter)rect_setleft, NULL, NULL },
    { "y", (getter)rect_gettop, (setter)rect_settop, NULL, NULL },
    { "w", (getter)rect_getwidth, (setter)rect_setwidth, NULL, NULL },
    { "h", (getter)rect_getheight, (setter)rect_setheight, NULL, NULL },
    { "width", (getter)rect_getwidth, (setter)rect_setwidth, NULL, NULL },
    { "height", (getter)rect_getheight, (setter)rect_setheight, NULL, NULL },
    { "top", (getter)rect_gettop, (setter)rect_settop, NULL, NULL },
    { "left", (getter)rect_getleft, (setter)rect_setleft, NULL, NULL },
    { "bottom", (getter)rect_getbottom, (setter)rect_setbottom, NULL, NULL },
    { "right", (getter)rect_getright, (setter)rect_setright, NULL, NULL },
    { "centerx", (getter)rect_getcenterx, (setter)rect_setcenterx, NULL, NULL },
    { "centery", (getter)rect_getcentery, (setter)rect_setcentery, NULL, NULL },
    { "topleft", (getter)rect_gettopleft, (setter)rect_settopleft, NULL, NULL },
    { "topright", (getter)rect_gettopright, (setter)rect_settopright, NULL,
     NULL },
    { "bottomleft", (getter)rect_getbottomleft, (setter)rect_setbottomleft,
      NULL, NULL },
    { "bottomright", (getter)rect_getbottomright, (setter)rect_setbottomright,
      NULL, NULL },
    { "midtop", (getter)rect_getmidtop, (setter)rect_setmidtop, NULL, NULL },
    { "midleft", (getter)rect_getmidleft, (setter)rect_setmidleft, NULL, NULL },
    { "midbottom", (getter)rect_getmidbottom, (setter)rect_setmidbottom, NULL,
      NULL },
    { "midright", (getter)rect_getmidright, (setter)rect_setmidright, NULL,
      NULL },
    { "size", (getter)rect_getsize, (setter)rect_setsize, NULL, NULL },
    { "center", (getter)rect_getcenter, (setter)rect_setcenter, NULL, NULL },

    { "__safe_for_unpickling__", (getter)rect_getsafepickle, NULL, NULL, NULL },
    { NULL, 0, NULL, NULL, NULL }  /* Sentinel */
};

你可以看到例如w 和 width 都调用 rect_getwidth:

/*width*/
static PyObject*
rect_getwidth (PyRectObject *self, void *closure)
{
    return PyInt_FromLong (self->r.w);
}

为了便于阅读，我仍然建议使用width/height 而不是w/h。

【讨论】：