Kreslení TrasovéPole
Kreslení TrasovéPole |
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Draft → PathArray |
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Kreslení, Architektura |
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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
Railway cross ties (sleepers) - Tangent mode + ForceVertical
Frenet Mode
- Drafting: Line, Polyline, Fillet, Arc, Arc by 3 points, Circle, Ellipse, Rectangle, Polygon, B-spline, Cubic Bézier curve, Bézier curve, Point, Facebinder, ShapeString, Hatch
- Annotation: Text, Dimension, Label, Annotation styles, Annotation scale
- Modification: Move, Rotate, Scale, Mirror, Offset, Trimex, Stretch, Clone, Array, Polar array, Circular array, Path array, Path link array, Point array, Point link array, Edit, Subelement highlight, Join, Split, Upgrade, Downgrade, Wire to B-spline, Draft to sketch, Set slope, Flip dimension, Shape 2D view
- Draft Tray: Select plane, Set style, Toggle construction mode, AutoGroup
- Snapping: Snap lock, Snap endpoint, Snap midpoint, Snap center, Snap angle, Snap intersection, Snap perpendicular, Snap extension, Snap parallel, Snap special, Snap near, Snap ortho, Snap grid, Snap working plane, Snap dimensions, Toggle grid
- Miscellaneous: Apply current style, Layer, Manage layers, Add a new named group, Move to group, Select group, Add to construction group, Toggle normal/wireframe display, Create working plane proxy, Heal, Show snap toolbar
- Additional: Constraining, Pattern, Preferences, Import Export Preferences, DXF/DWG, SVG, OCA, DAT
- Context menu:
- Layer container: Merge layer duplicates, Add new layer
- Layer: Activate this layer, Select layer contents
- Text: Open hyperlinks
- Wire: Flatten
- Working plane proxy: Write camera position, Write objects state
- Getting started
- Installation: Download, Windows, Linux, Mac, Additional components, Docker, AppImage, Ubuntu Snap
- Basics: About FreeCAD, Interface, Mouse navigation, Selection methods, Object name, Preferences, Workbenches, Document structure, Properties, Help FreeCAD, Donate
- Help: Tutorials, Video tutorials
- Workbenches: Std Base, Arch, Assembly, CAM, Draft, FEM, Inspection, Mesh, OpenSCAD, Part, PartDesign, Points, Reverse Engineering, Robot, Sketcher, Spreadsheet, Start, Surface, TechDraw, Test Framework, Web
- Hubs: User hub, Power users hub, Developer hub