Navigation Cube/zh-cn

导航立方控制，或称导航立方是一种用于重新定位的图形用户界面. 在默认情况下，它位于3D显示界面的右上角. 如果您在标准的3D视图下查看，会发现它长相如下：



导航立方由以下几部分组成：
 * 指向箭头
 * 主导航立方
 * 微型立方菜单

鼠标在导航立方上经过时，它会呈淡蓝色；点击时，会根据上面标明的视角对3D视图进行重新定位. 在下面的示例中，已经通过mouse gesture将3D视图旋转到一个“非标准”的方位. 现在，鼠标指针正停留在导航立方的一个角上（根据淡蓝色可以判断出）；若点击此角，便会令3D视图重新定位至此角正对您的标准轴测图.



指向箭头
导航立方有6个指向箭头：4个三角箭头，位列上、下、左、右；以及2个弯曲箭头，分列上箭头的两侧.

单击三角箭头，将令3D视图绕正交于此箭头方向的直线旋转45度. 单击弯曲箭头，将令3D视图绕指向坐在显示器前的您的直线旋转45度.

Main Navigation Cube
The main navigation cube ("nav cube" in the rest of this section), tracks the orientation of the actual object in the main part of the 3D view. Any operation which reorients the main 3D view will reorient the nav cube as well.

主导实质上是一种由3种主要组件（面、边与角）构成的立方体所实现的增强3D视图，所以可以用鼠标指针轻松的点击来进行导航. 点击特定的组件将令3D视图切换至组件正对您的视角. 主导看起来有点儿“扁平”，仿佛离您较远的组件比直接面对您的组件更大. 借此即可看到并选择与正对着您的组件相邻的组件. 例如，在一个普通立方体的“标准”视角下，当一个面正对着您，您也能够看到此面的4条边与4个角. 在“扁平”的主导中，您依然能看到正（对）面的每个邻接面、连接正反面角上的4条边. 这将令您可以选择任意标准视图（除了背面及其面上的边，26个组件中有21个可见）: 不可选的组件:
 * 正对您的立方体面（其实选也无用，因为当前采用的即此面）
 * 当前立方体面上的4条边
 * 当前立方体面上的4个角
 * 四个相邻的立方体面
 * 与背面相连的4条边
 * 背面上的4个角
 * 当前立方体的背面
 * 背面上的边

Note: As of this writing (v 0.18), there are some problems with the nav cube; not all features are currently selectable. In particular, edges are not selectable, nor are the four corners of the immediately facing face.

Face Selection
Clicking on a face will orient the 3D view with that particular face facing you. From a face view, other selection points are available as noted above. There are four thin "bars" on each of the outside edges, representing the four adjacent faces; clicking them will select the view corresponding to the adjacent face. There are four round corners which may be used to set the corresponding axonometric view. There is also an interior set of edges and corners, which are currently non-functional.

Edge Selection
Unfortunately, edge selection is currently broken. Attempting to select an edge will select the face which lies behind it. Clicking an edge should center that edge so it is facing you.

Corner Selection
Clicking one of the corners will give you an axonometric view as seen from that corner. As noted above, currently when a face is directly facing you, the corners of that face are not selectable.

Mini-cube Menu
In the lower right corner of the navigational cube is a small cube. Clicking on this cube will bring up a menu you may use to change the type of view (Orthographic, Perspective, Isometric) and to do a "Zoom to Fit".

Moving the Navigation Cube Display
You may move the entire navigation cube control structure to another location in the 3D display by pressing the mouse anywhere in the main navigation cube and dragging. As of this writing (v 0.18), the structure will not begin to move until the mouse pointer has moved past the edge of the main navigation cube.