底图捕捉工具

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描述

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。

捕捉功能可用于底图工作台建筑工作台(Arch Workbench)中的大多工具,利用捕捉工具栏中的Draft Snap Lock.svg Draft ToggleSnap按钮即可对此功能进行全局开启或关闭。而通过View → Toolbars → Draft Snap菜单便可以激活捕捉工具栏。通过点选捕捉工具栏中的各按钮,即可开启或关闭对应的捕捉方法。

Draft Snap Endpoint example.png

利用捕捉功能,令所绘线段垂直于另一线段

Snap tools

These tools are available in the Draft Snap toolbar and in the Draft snap widget.

Note that circular edges do not have to be full circles.

  • Draft Snap Lock.svg Snap Lock: enables or disables snapping globally.
  • Draft Snap Angle.svg Snap Angle: snaps to the special cardinal points on circular edges, at multiples of 30° and 45°.
  • Draft Snap Extension.svg Snap Extension: snaps to an imaginary line that extends beyond the endpoints of straight edges.
  • Draft Snap Parallel.svg Snap Parallel: snaps to an imaginary line parallel to straight edges.
  • Draft Snap Special.svg Snap Special: snaps to special points defined by the object.
  • Draft Snap Near.svg Snap Near: snaps to the nearest point on faces or edges.
  • Draft Snap Ortho.svg Snap Ortho: snaps to imaginary lines that cross the previous point at 0°, 45°, 90° and 135°.
  • Draft Snap Grid.svg Snap Grid: snaps to the intersections of grid lines.

Advanced snapping

  • Additional snap points can be obtained by combining two snap options. For example combining Draft Snap Ortho and Draft Snap Extension will give you a snap point at the intersection of their imaginary lines.
  • Snapping can be combined with constraining.
  • Press Q to insert a "hold point" at the current location of the cursor. You can snap to the orthogonal axes of hold points, and to the intersections of these axes. If the Draft Snap Midpoint option is active, you can also snap to the midpoint between two hold points.
  • Press ` one or more times to snap to an object that is obscured by other geometry. This is called "snap cycling". Note that you must move the cursor by a small amount in the 3D view after pressing the key.

Draft Snap example cycling 1.png

Snap cycling 1: The red rectangle was created first therefore it has snap priority. Without snap cycling you cannot snap to the green rectangle where it is overlapped by the red rectangle.

Draft Snap example cycling 2.png

Snap cycling 2: After using the snap cycle key once the green rectangle receives snap priority. Snapping to the midpoint of the overlapped green edge is now possible.

Notes

同时采用多种捕捉方法,可能会便于您将对象绘制在预期位置上。但如果您的鼠标指针频繁被导向在一个错误的点上,那也许就是采用多种捕捉方法所带来的副作用,此时,请尝试仅采用一种捕捉方法。

Preferences

See also: Preferences Editor and Draft Preferences.

Note that after changing some preferences you must restart FreeCAD.

  • When a Draft or Arch command requiring point input is active, the maximum distance at which Draft Snap Grid detects the intersections of grid lines can be changed on-the-fly by pressing [ (increase key) or ] (decrease key). This setting is stored: Tools → Edit parameters... → BaseApp → Preferences → Mod → Draft → snapRange. It can also be changed in the task panel of the Draft SelectPlane command.
  • To only snap when the Snap mod key is held down:
    • Deselect: Edit → Preferences... → Draft → Grid and snapping → Snapping → Always snap (disable snap mod).
    • The default Snap mod key, Ctrl, can be changed: Edit → Preferences... → Draft → Grid and snapping → Snapping → Snap mod.
  • To only show the Draft Snap toolbar when a command is active:
    • Select: Edit → Preferences... → Draft → Grid and snapping → Snapping → Show Draft Snap toolbar.
    • Select: Edit → Preferences... → Draft → Grid and snapping → Snapping → Hide Draft Snap toolbar after use.
  • The snap symbols can be changed: Edit → Preferences... → Draft → Visual settings → Visual settings → Snap symbol style.
  • The color of the snap symbols and the dimensions of Draft Snap Dimensions can be changed: Edit → Preferences... → Draft → Visual settings → Visual settings → Color.
  • The mentioned single character keyboard shortcuts can be changed: Edit → Preferences... → Draft → User interface settings → In-Command Shortcuts.


Arrow-left.svg Previous: Snap widget
Next: Constrain Arrow-right.svg