Kreslení TrasovéPole

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Link Array

Path LinkArray

Draft

Umístění Menu
Kreslení TrasovéPole
Draft → PathArray
Pracovní stoly
Kreslení, Architektura
Výchozí zástupce
Nikdo
Představen ve verzi
-
Viz také
Draft Array

Popis

Nástroj TrasovéPole umístí vybraný tvar na vybranou trasu. Trasa může být drát nebo jedna nebo více hran. Tvary na trase mohou být volitelně zarovnány podle trasy. Podle potřeby může být specifikován Vektor pro posunutí tvaru tak, že těžiště tvaru bude na trase. Pokud není vybrán žádný objekt, budete vyzváni k jeho výběru.

The PathArray tool can be used on any object that has a Part TopoShape, meaning 2D shapes created with the Draft Workbench, but also 3D solids created with other workbenches, for example, Part, PartDesign, or Arch.

To create orthogonal, polar or circular arrays, use the corresponding OrthoArray, PolarArray, or CircularArray tools.
To position App Link copies along a path use PathLinkArray.
To position copies at specified points use PointArray or PointLinkArray.
To create copies and manually place them use Move or Rotate.
To create exact copies and manually place or scale them, use Clone or Std LinkMake.

Object arranged along a path

Použití

Vyberte objekt tvaru, který chcete kopírovat.
Vyberte objekt trasy, po které chcete tvar kopírovat -nebo-
Vyberte nějaké hrany pro určení trasy.
Stiskněte tlačítko Kreslení TrasovéPole.

Each element in the array is an exact clone of the original object, but the entire array is considered a single unit in terms of properties and appearance.

Note: if the ÚdajeBase object doesn't seem to be positioned correctly in the path, check that its ÚdajePlacement is in the origin (0,0,0). Certain objects can be placed anywhere in the 3D space when used with the PathArray tool, but others must be at the origin, particularly those created by using Part Extrude with a 2D profile like a Sketch.

Volby

Pole začne s kopiemi tvaru, které nejsou zarovnány podle trasy ani defaultně posunuty na novou pozici. Ve vlastnostech můžete měnit počet, zarovnání a/nebo vektor posunutí.

Vlastnosti

A PathArray is derived from a Part Feature (Part::Feature class), therefore it shares all the latter's properties. In addition to the properties described in Part Feature, the PathArray has the following properties in the property editor.

ÚdajeBase: Objekt tvaru
ÚdajePathObj: Objekt trasy
ÚdajePathSubs: Subelementy(hrany) objektu trasy, které budou použity jako trasa
ÚdajeCount: Počet kopií tvaru
ÚdajeXlate: Vektor posunutí
ÚdajeAlign: Hodnota True pro zarovnání tvarů podle trasy, False pro ponechání tvarů podle jejich původní orientace.

Objects

ÚdajeBase (LinkGlobal): specifies the object to duplicate in the path.
ÚdajeCount (Integer): specifies the number of copies to create in the path.
ÚdajePath Object (LinkGlobal): specifies the object along which the copies will be distributed. It must contain 'Edges' in its Part TopoShape; for example, it could be a Wire or BSpline.
ÚdajePath Subelements (LinkSubListGlobal): specifies the sub-elements (edges) of the ÚdajePath Object on which the copies will be created. The copies will be created only on these edges. If this property is empty, the copies will be distributed on the entire ÚdajePath Object.

Skriptování

Nástroj TrasovéPole může být využit v makrech a z konzoly Pythonu použitím následující funkce:

Older call

path_array = makePathArray(base_object, path_object, count, xlate=None, align=False, pathobjsubs=[])

New call

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):

Rozloží požadovaný počet (count) kopií objektu shapeobject podél trasy pathobject nebo subobject (vybrané hrany) pathobjectu. Volitelně posune každou kopii ve směru a vzdálenosti podle FreeCAD.Vectoru pro nastavení rozdílu mezi středem tvaru a referenčním bodem tvaru. Volitelně zarovná baseobject tangenciálně/normálně/binormálně k trase.

Příklad:

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()

Technical explanation for the Align property

When ÚdajeAlign is false, the placement of the copied shapes is easy to understand; they are just moved to a different position in their original orientation.

Object arranged along a closed path in the original orientation

When ÚdajeAlign is true, the positioning of the shapes becomes a bit more complex:

First, Frenet coordinate systems are built on the path: X is tangent, Z is normal, Y is binormal.
Then the original object is copied to every on-path coordinate system, so that the global origin is matched with the on-path coordinate system origin.

Object arranged along a closed path; description of components and path

The following images show how the array is produced, depending on which plane the path is.

Path on XY Plane:

Object arranged along a closed path which is aligned to the XY plane

Path on XZ Plane:

Object arranged along a closed path which is aligned to the XZ plane

Path on YZ Plane:

Object arranged along a closed path which is aligned to the YZ plane

As you reorient the path but not the object, the result is consistent: the object remains aligned to the path the way it was before reorienting the path.

Editor: thank you to user DeepSOIC for this explanation.

Additional alignment modes and options introduced in v0.19

Original mode (the default) is the historic alignment mode as in version 0.18. It is not really the Frenet alignment. Original mode uses the normal parameter from Draft.getNormal (or the default) as a constant - it does not calculate curve normal. X follows the curve tangent, Y is the normal parameter, Z is X.Cross(Y).

Tangent mode is similar to Original, but includes a rotation to align the Base object's X to the TangentVector before placing copies. After the rotation, Tangent behaves the same as Original. In previous versions this rotation would be performed manually before invoking PathArray.

Frenet mode orients the copies to a coordinate system along the path. X is tangent to curve, Y is curve normal, Z is curve binormal. If a normal can not be computed (ex a straight line), the default is used.

The ForceVertical option applies to Original and Tangent modes. When this option is applied, the normal parameter from Draft.getNormal is ignored. X follows the curve tangent, Z is the VerticalVector property and Y is X.Cross(Z).

Version 18 cycle chain - Original mode