Draft PathArray/cs

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, , or tools.
 * To position App Link copies along a path use.
 * To position copies at specified points use or.
 * To create copies and manually place them use or.
 * To create exact copies and manually place or scale them, use or.



Použití

 * 1) Vyberte objekt tvaru, který chcete kopírovat.
 * 2) Vyberte objekt trasy, po které chcete tvar kopírovat -nebo-
 * 3) Vyberte nějaké hrany pro určení trasy.
 * 4) Stiskněte tlačítko.

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.

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

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 ( 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.


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


 * : specifies the object to duplicate in the path.
 * : specifies the number of copies to create in the path.
 * : specifies the object along which the copies will be distributed. It must contain in its Part TopoShape; for example, it could be a  or.
 * : specifies the sub-elements (edges) of the 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.

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

Older call:

New call:


 * 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:

Technical explanation for the Align property
When is, the placement of the copied shapes is easy to understand; they are just moved to a different position in their original orientation.



When is, the positioning of the shapes becomes a bit more complex:
 * 1) First, Frenet coordinate systems are built on the path: X is tangent, Z is normal, Y is binormal.
 * 2) 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.



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

Path on XY Plane:



Path on XZ Plane:



Path on 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.

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

Railway cross ties (sleepers) - Tangent mode + ForceVertical

Frenet Mode