如果外部是圆角，我们就应该控制上面一副图像和它的弧线部分具有一样的宽度。
If the outside corners are rounded, we should make the front image only as wide as the curved portion of the image.
易学性还要求我们，控制的映射必须具有一致性；如果在游戏中的某个区域，X键代表的是“Yes”，那么它就应该由始至终的用来表示确定。
Learnability also dictates that controller mappings should be consistent; if the X button is used for "yes" in one area of a game, it should always be used for confirmation throughout.
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