Draft BSpline

Description
The Draft BSpline command creates a B-spline curve from several points. It uses the Draft Linestyle set on the Draft Tray.

The Draft BSpline command specifies the through which the curve will pass. The Draft BezCurve and the Draft CubicBezCurve commands, on the other hand, use to define the position and curvature of the spline.



Usage

 * 1) There are several ways to invoke the command:
 * 2) * Press the button.
 * 3) * Select the option from the menu.
 * 4) * Use the keyboard shortcut: then.
 * 5) Click the first point in the 3D view, or type coordinates and press the  button in the related Line task panel.
 * 6) Click additional points in the 3D view, or type coordinates and press the  button in the related Line task panel.
 * 7) Press  or the  button  in the related Line task panel to finish the command.

Options

 * Press or the  button to finish the spline, leaving it open.
 * Press or the  button to close the spline, that is, a curve will be added from the last point to the first one to form a face. At least three points are required to form a face.
 * Press or the  button to remove the curve segments already placed, but keep editing the spline from the last point.
 * Press or the  button to adjust the current working plane in the orientation of the last point.
 * Press, or  after a point to constrain the next point on the given axis.
 * To enter coordinates manually, simply enter the numbers, then press between each X, Y and Z component. You can press the  button when you have the desired values to insert the point.
 * Press or click the checkbox to toggle relative mode. 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 origin (0,0,0).
 * Press or click the checkbox to toggle continue mode. If continue mode is on, the BSpline command will restart after you finish the spline, allowing you to draw another one without pressing the command button again.
 * Press or click the checkbox to toggle filled mode. If filled mode is on, a closed spline will create a filled face ; if not, the closed spline will not make a face.
 * the spline should not be filled if it intersects itself, as it won't create a proper face. If the spline is filled but no shape is visible, manually set to  to see the spline.


 * Hold while drawing to force snapping your point to the nearest snap location, independently of the distance.
 * Hold while drawing to constrain your next point horizontally or vertically in relation to the last one.
 * Press + or press the button to undo the last point.
 * Press or the  button to abort the current command; curve segments already placed will remain.

Properties
See also: Property editor.

A Draft BSpline object is derived from a Part Part2DObject and inherits all its properties. It also has the following additional properties:

Data

 * : (read-only) specifies the area of the face of the spline. The value will be if  if  or the face cannot be created.
 * : specifies if the spline is closed or not. If the spline is initially open this value is, setting it to will draw a curve segment to close the spline. If the spline is initially closed this value is , setting it to  will remove the last curve segment, and make the spline open.
 * : specifies if the spline makes a face or not. If it is a face is created, otherwise only the perimeter is considered part of the object. This property only works if  is  and if the spline does not self-intersect.
 * : affects the shape of the spline.
 * : specifies the points of the spline in its local coordinate system.

View

 * : specifies the size of the symbol displayed at the end of the spline.
 * : specifies the type of symbol displayed at the end of the spline, which can be, , , , or.
 * : specifies whether to show a symbol at the end of the spline, so it can be used as an annotation line.
 * : specifies the Draft Pattern with which to fill the face of the closed spline. This property only works if is, and if  is.
 * : specifies the size of the Draft Pattern.

Scripting
See also: Autogenerated API documentation and FreeCAD Scripting Basics.

To create a Draft BSpline use the method  of the Draft module. This method replaces the deprecated method.


 * Creates a object from the given list of points,.
 * Each point in the list is defined by its, with units in millimeters.
 * Alternatively, the input can be a, from which points are extracted.
 * If is, or if the first and last points are identical, the wire is closed.
 * If is  the shape is created at the origin.
 * If is, and the spline is closed, the spline will make a face, that is, it will appear filled.

Example: