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Beskrivning

Offsetting a Draft Wire

See also: Draft Snap and Draft Constrain.

Options

The single character keyboard shortcuts available in the task panel can be changed. See Draft Preferences. The shortcuts mentioned here are the default shortcuts.

• If the OCC-style offset checkbox is checked a special offset style is used: open Draft Wires are offset on both sides, and new edges are connected with rounded corners. This only works for planar objects with at least two edges. Note that with this style a new non-parametric object is created, and if copy mode is off the original object is deleted.
• Press C or click the Copy checkbox to toggle copy mode. If copy mode is on, the command will create an offset copy instead of offsetting the original object.
• Holding down Alt before picking points in the 3D View will also toggle copy mode. While Alt is held down multiple offset points can be picked. Release Alt to finish the command and see the created copies.
• Hold down Shift to keep the offset distance linked to the current segment.
• Press S to switch Draft snapping on or off.
• Press Esc or the Close button to abort the command.

Notes

• To create an offset version of a Draft BSpline its points are offset individually, and from the new points a new spline is calculated. This new spline is not parallel to the original spline. For an exact parallel offset of a Draft BSpline the Part Offset2D command should be used.
• The Draft Offset command cannot handle Draft BezCurves. Use the Part Offset2D command instead.

Scripting

See also: Autogenerated API documentation and FreeCAD Scripting Basics.

To offset objects use the offset method of the Draft module. The method can only handle Draft Wires, Draft Circles, Draft Rectangles, Draft Polygons and Draft BSplines.

offset_obj = offset(obj, delta, copy=False, bind=False, sym=False, occ=False)

• obj is the object to be offset.
• delta contains the offset information:
  • For Draft Wires, Draft Rectangles and Draft Polygons it is an offset vector that must be perpendicular to the first segment of the object.
  • For Draft Circles it is the new radius.
  • For Draft BSplines it is a list of new points.
• If copy is True the original object is kept and a new object is created.
• If bind is True a face is created by connecting the shape of the original object and the shape of its offset. This only works for open Draft Wires.
• If sym is True, and bind is True as well, the offset is made on both sides of the original object, the total width being the length of the given vector. This only works for open Draft Wires.
• If occ is True OCC-style offsetting is used. See Options. If occ is True the bind and sym arguments are ignored.
• offset_obj is returned with the original offset object, or with the new object. If bind is True or occ is True, the new object is a Part::Feature object.

Example:

import FreeCAD as App
import Draft

doc = App.newDocument()

p1 = App.Vector(0, 0, 0)
p2 = App.Vector(1500, 2000, 0)
p3 = App.Vector(4000, 0, 0)

wire = Draft.make_wire([p1, p2, p3])
doc.recompute()

vector = App.Vector(-200, 150, 0)
offset1 = Draft.offset(wire, vector, copy=True, bind=True, sym=True)
offset2 = Draft.offset(wire, 3*vector, copy=True)
offset3 = Draft.offset(wire, 6*vector, copy=True)
offset4 = Draft.offset(wire, 9*vector, copy=True)
offset5 = Draft.offset(wire, 1.5*vector, copy=True, occ=True)

doc.recompute()

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