Draft Constrain/zh-cn

描述
在底图工作台工具中，您可以通过指针单击3D视图来拾取图形中的点、距离、半径与角度.

但是，当这些参数需要特别精准时，可能就要在工具对话框中输入准确的底图坐标.

选择更加精准点的另一种方式是：在X、Y或Z的某一特定方向上对指针的移动加以约束.

水平约束与垂直约束


按住键，即可在上一个输入点的水平（X）方向或垂直（Y）方向上绘制当前输入点. 至于约束的是水平方向还是垂直方向，则取决于按下 时鼠标指针的位置；如果按键时指针位于上一个点的东西两侧，则约束的是水平方向；如果按键时指针位于上一个点的南北两侧，则约束的是垂直方向. 如果要改变约束方向，只需松开键,并将指针移到另一个新位置，再重新按下键即可.

Some tools like Draft Offset and Draft Trimex use constraining differently. They do not constrain vertically or horizontally but use a different method more adapted to the particular tool, for example, constraining the operation to a certain line segment.

While constraining the movement of the pointer, the Taskview panel will lock the coordinate values that are not being modified. For example, if using a horizontal constraint, only the X value changes, while the Y and Z values remain at their original relative or absolute coordinates, depending on whether relative mode is active or not.



X, Y, Z constraints
Press one of the, or  keys after a point to constrain the next point on the specified X, Y, or Z direction. Press the same key again to release the constraint.

Pressing or  is equivalent to holding  and constraining horizontally or vertically, respectively.