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Draft_PathArray.md

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GuiCommand
Name MenuLocation Workbenches Version SeeAlso
Draft PathArray
Modification , Array tools , Path array
Draft_Workbench, Arch_Workbench
0.14
Draft_OrthoArray, Draft_PolarArray, Draft_CircularArray, Draft_PathLinkArray, Draft_PointArray, Draft_PointLinkArray

Draft PathArray

Description

The Draft PathArray command creates a regular array from a selected object by placing copies along a path. Use the Draft PathLinkArray command to create a more efficient Link array instead. Except for the type of array that is created, Link array or regular array, the Draft PathLinkArray command is identical to this command.

Both commands can be used on 2D objects created with the Draft Workbench or Sketcher Workbench, but also on many 3D objects such as those created with the Part Workbench, PartDesign Workbench or Arch Workbench.

*Draft PathArray*

Usage

  1. Select the object you wish to array.
  2. Add the path object to the selection. It is also possible to select edges instead. The edges must belong to the same object and they must be connected.
  3. There are several ways to invoke the command:
    • Press the Path array button.
    • Select the Modification → Array tools → Path array option from the menu.
  4. The array is created.
  5. Optionally change the properties of the array in the Property editor.

Alignment

The alignment of the elements in a Draft PathArray depends on the properties of the array and the orientation of the source object. The position of the source object is ignored: for the purpose of the array the {{Value|x}}, {{Value|y}} and {{Value|z}} are set to {{Value|0}}. If the Align property of the array is set to False the orientation of the array elements is identical to that of the source object. If it is set to True the X axis of the local coordinate system of each element placement is tangent to the path. The Y and Z axes of the local coordinate systems depend on the Align Mode property of the array. Other array properties involved in the alignment include Tangent Vector, Force Vertical and Vertical Vector.

*3 arrays based on the same non-planar path. From left to right: Align is false, Align is true with Align Mode Original and Align is true with Align Mode Frenet*.

Align Mode

Three modes are available:

Original

This mode comes closest to the single Align Mode available in version 0.18. It relies on a fixed normal vector. If the path is planar this vector is perpendicular to the plane of the path, else a default vector, the positive Z axis, is used. From this normal vector and the local tangent vector (the local X axis) a cross product is calculated. This new vector is used as the local Z axis. The orientation of the local Y axis is determined from the local X and Z axes.

Frenet

This mode uses the local normal vector derived from the path at each element placement. If this vector cannot be determined (for example in the case of a straight segment) a default vector, again the positive Z axis, is used instead. With this vector and the local tangent vector the local coordinate system is determined using the same procedure as in the previous paragraph.

Tangent

This mode is similar to Align Mode {{Value|Original}} but includes the possibility to pre-rotate the source object by specifying a Tangent Vector.

Force Vertical and Vertical Vector

These properties are only available if Align Mode is {{Value|Original}} or {{Value|Tangent}}. If Force Vertical is set to True the local coordinate system is calculated in a different manner. The Vertical Vector is used as a fixed normal vector. From this normal vector and the local tangent vector (the local X axis) again a cross product is calculated. But now this vector is used as the local Y axis. The orientation of the local Z axis is determined from the local X and Y axes.

Using these properties can be required if one of the edged of the path is (almost) parallel to the default normal of the path.

Properties

See also: Property editor.

A Draft PathArray object is derived from a Part Feature object and inherits all its properties (with the exception of some View properties that are not inherited by Link arrays). The following properties are additional unless otherwise stated:

Data

{{TitleProperty|Link}}

The properties in this group are only available for Link arrays. See Std LinkMake for more information.

  • Scale|Float

  • Scale Vector|Vector|Hidden

  • Scale List|VectorList

  • Visibility List|BoolList|Hidden

  • Placement List|PlacementList|Hidden

  • Element List|LinkList|Hidden

  • _ Link Touched|Bool|Hidden

  • _ Child Cache|LinkList|Hidden

  • Colored Elements|LinkSubHidden|Hidden

  • Link Transform|Bool

{{TitleProperty|Alignment}}

  • Align|Bool: specifies if the elements in the array are aligned along the path or not. If it is False all other properties in this group, except Extra Translation, do not apply and are hidden.

  • Align Mode|Enumeration: specifies the align mode, which can be {{Value|Original}}, {{Value|Frenet}} or {{Value|Tangent}}.

  • End Offset|Length: specifies the length from the end of the path to the last copy. Must be smaller than the length of the path minus the Start Offset. (v0.21)

  • Extra Translation|VectorDistance: specifies an additional displacement for each element along the path.

  • Force Vertical|Bool: specifies whether to override the default normal direction with the value of Vertical Vector. Only used if Align Mode is {{Value|Original}} or {{Value|Tangent}}.

  • Start Offset|Length: specifies the length from the start of the path to the first copy. Must be smaller than the length of the path. (v0.21)

  • Tangent Vector|Vector: specifies the alignment vector. Only used if Align Mode is {{Value|Tangent}}.

  • Vertical Vector|Vector: specifies the override for the default normal direction. Only used if Vertical Vector is True.

{{TitleProperty|Objects}}

  • Base|LinkGlobal: specifies the object to duplicate in the array.

  • Count|Integer: specifies the number of elements in the array.

  • Expand Array|Bool: specifies whether to expand the array in the Tree view to enable the selection of its individual elements. Only available for Link arrays.

  • Path Object|LinkGlobal: specifies the object to be used for the path. It must contain {{Value|Edges}} in its Part TopoShape.

  • Path Subelements|LinkSubListGlobal: specifies a list of edges of the Path Object. If supplied only these edges are used for the path.

View

{{TitleProperty|Link}}

The properties in this group, with the exception of the inherited property, are only available for Link arrays. See Std LinkMake for more information.

  • Draw Style|Enumeration

  • Line Width|FloatConstraint

  • Override Material|Bool

  • Point Size|FloatConstraint

  • Selectable|Bool: this is an inherited property that appears in the Selection group for other arrays

  • Shape Material|Material

{{TitleProperty|Base}}

The properties in this group, with the exception of the inherited property, are only available for Link arrays. See Std LinkMake for more information.

  • Child View Provider|PersistentObject|Hidden

  • Material List|MaterialList|Hidden

  • Override Color List|ColorList|Hidden

  • Override Material List|BoolList|Hidden

  • Proxy|PythonObject|Hidden: this is an inherited property.

{{TitleProperty|Display Options}}

The properties in this group are inherited properties. See Part Feature for more information.

  • Bounding Box|Bool: this property is not inherited by Link arrays.

  • Display Mode|Enumeration: for Link arrays it can be {{value|Link}} or {{value|ChildView}}. For other arrays it can be: {{value|Flat Lines}}, {{value|Shaded}}, {{value|Wireframe}} or {{value|Points}}

  • Show In Tree|Bool

  • Visibility|Bool

{{TitleProperty|Draft}}

  • Pattern|Enumeration: not used.

  • Pattern Size|Float: not used.

{{TitleProperty|Object style}}

The properties in this group are not inherited by Link arrays.

Scripting

See also: Autogenerated API documentation and FreeCAD Scripting Basics.

To create a path array use the make_path_array method ((v0.19) ) of the Draft module. This method replaces the deprecated makePathArray method.

path_array = make_path_array(base_object, path_object,
                             count=4, extra=App.Vector(0, 0, 0), subelements=None,
                             align=False, align_mode="Original", tan_vector=App.Vector(1, 0, 0),
                             force_vertical=False, vertical_vector=App.Vector(0, 0, 1),
                             use_link=True)

  • base_objectis the object to be arrayed. It can also be the Label (string) of an object in the current document.

  • path_objectis the path object. It can also be the Label (string) of an object in the current document.

  • countis the number of elements in the array.

  • extrais a vector that displaces each element.

  • subelementsis a list of edges of path_object, for example ["Edge1", "Edge2"]. If supplied only these edges are used for the path.

  • If align is True the elements are aligned along the path depending on the value of align_mode, which can be "Original", "Frenet" or "Tangent".

  • tan_vectoris a unit vector that defines the local tangent direction of the elements along the path. It is used when align_mode is "Tangent".

  • If force_vertical is True vertical_vector is used for the local Z direction of the elements along the path. It is used when align_mode is "Original" or "Tangent".

  • If use_link is True the created elements are App Links instead of regular copies.

  • path_arrayis returned with the created array object.

Example:

import FreeCAD as App
import Draft

doc = App.newDocument()

p1 = App.Vector(500, -1000, 0)
p2 = App.Vector(1500, 1000, 0)
p3 = App.Vector(3000, 500, 0)
p4 = App.Vector(4500, 100, 0)
spline = Draft.make_bspline([p1, p2, p3, p4])
obj = Draft.make_polygon(3, 500)

path_array = Draft.make_path_array(obj, spline, 6)
doc.recompute()

wire = Draft.make_wire([p1, -p2, -p3, -p4])
path_array2 = Draft.make_path_array(obj, wire, count=3, extra=App.Vector(0, -500, 0), subelements=["Edge2", "Edge3"], align=True, force_vertical=True)
doc.recompute()

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