Draft BezCurve: Difference between revisions
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The object is created as a single Bezier Curve of degree {{incode|number_of_points - 1}}. |
The object is created as a single Bezier Curve of degree {{incode|number_of_points - 1}}. |
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The Bezier curve can be changed to a piecewise curve of a specified degree after creation by changing its properties. Bezier curves can be edited using {{KEY|[[Image:Draft Edit.png|16px]] [[Draft Edit]]}}. |
The Bezier curve can be changed to a piecewise curve of a specified degree after creation by changing its properties. Bezier curves can be edited using {{KEY|[[Image:Draft Edit.png|16px]] [[Draft Edit]]}}. |
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[[Image:Draft_BezCurve_Example.png|400px]] |
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==Options== <!--T:4--> |
==Options== <!--T:4--> |
Revision as of 15:14, 9 November 2018
Draft BezCurve |
Menu location |
---|
Draft → BezCurve |
Workbenches |
Draft, Arch |
Default shortcut |
B Z |
Introduced in version |
0.14 |
See also |
None |
Description
The BezCurve tool creates a Bezier Curve, or a piecewise Bezier curve, from several points in the current work plane. It uses the Draft Linestyle set on the Draft Tray.
How to use
- Press the Draft BezCurve button, or press B then Z keys.
- Click a first point on the 3D view, or type a coordinate and press the add point button.
- Click additional points on the 3D view, or type a coordinate and press the add point button.
- Press Esc or the Close button, or double-click the last point to complete the edition.
The object is created as a single Bezier Curve of degree number_of_points - 1
.
The Bezier curve can be changed to a piecewise curve of a specified degree after creation by changing its properties. Bezier curves can be edited using Draft Edit.
Options
- Press F or the Finish button to finish the spline, leaving it open
- Press C or the Close button or click on the first point to finish the spline, but making it closed by adding a last segment between the last point and the first one.
- Press X, Y or Z after a point to constrain the next point on the given axis.
- To enter coordinates manually, simply enter the numbers, then press ENTER between each X, Y and Z component.
- Press R or click the checkbox to check/uncheck the Relative button. If relative mode is on, the coordinates of the next point are relative to the last one. If not, they are absolute, taken from the (0,0,0) origin point.
- Press T or click the checkbox to check/uncheck the Continue button. If continue mode is on, the BezCurve tool will restart after you finish or close it, allowing you to draw another one without pressing the BezCurve button again.
- Press CTRL while drawing to force snapping your point to the nearest snap location, independently of the distance.
- Press SHIFT while drawing to constrain your next point horizontally or vertically in relation to the last one.
- Press W or press the Wipe button to remove the existing segments and start the spline from the last point.
- Press CTRL+Z or press the Undo button to undo the last point.
- Press ESC or the Cancel button to abort the current BezCurve command.
Properties
- DataClosed: Specifies if the Bezier Curve is closed or not
- DataDegree: Specifies the degree of the Bezier Curve (or segments)
Scripting
The BezCurve tool can by used in macros and from the python console by using the following function:
makeBezCurve(pointslist,[closed],[placement],[support],[degree])
- Create a Bezier Curve object from the given list of vectors. Instead of a pointslist, you can also pass a Part Wire.
Example:
import FreeCAD,Draft
myFeature = Draft.makeBezCurve(Draft.makeBezCurve(points,False)
Contraining Nodes
The segment endpoints in a piecewise Bezier Curve can be constrained such that adjacent control points are tangent or symmetric to the segments at the endpoint. This is done after object creation using Draft Edit.
- Sharp - remove constraints
- Tangent - force adjacent control points to be tangent
- Symmetric - force adjacent control points to be tangent and equi-distant
Limitations
- This tool is not available before FreeCAD version 0.14
- The Points Property does not yet appear in the properties list.
- OpenCascade does not support Bezier Curve with degree > 25. This should not be a problem in practice.
- 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