edit points in a bez curve

[Vasten]

I can see the points as an array of vectors

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bezobj.Points
[Vector (-26.04, 8.41, 4.0), Vector (-17.19, -1.9, 0.0), Vector (-8.95, -1.39, 0.0), Vector (-12.08, 10.62, 0.0), Vector (-15.2, 22.64, 0.0), Vector (-8.79, 24.22, 0.0), Vector (-0.07, 16.76, 0.0)]

I can pick out a a point

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>>> bez.Points[0]
Vector (-26.04, 8.41, 4.0)

but if i edit one nothing changes and when I check the value it has not changed

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>>> bez.Points[0]=FreeCAD.Vector(0,0,0)
>>> bez.Points
[Vector (-26.04, 8.41, 4.0), Vector (-17.19, -1.9, 0.0), Vector (-8.95, -1.39, 0.0), Vector (-12.08, 10.62, 0.0), Vector (-15.2, 22.64, 0.0), Vector (-8.79, 24.22, 0.0), Vector (-0.07, 16.76, 0.0)]

Am i doing something wrong? are the points actually derived form something else?

[Vasten]

nevermind

after more testing and trial and error i figured it out

you have to reset the full array

so

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pts=bez.Points
pts[x]=vector(blahblahblah)
bez.Points=pts

this works

[onekk]

nevermind

after more testing and trial and error i figured it out

you have to reset the full array

so

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pts=bez.Points
pts[x]=vector(blahblahblah)
bez.Points=pts

this works

Not necessarily, but with "fragments" of code it is difficult to guess on what you are operating.

Plus a little idea of what version of FC are you using will be useful, as something could be changed between versions, and it is not ever true that an user is using latest version (0.20) or maybe even ex stable version (0.19.4), some user are using even old 0.18 version.



a simple:

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dir(Part.BezierCurve)

In Python Console will show that Bezier curves have this methods among others:

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 'setPole', 'setPoles', 'setWeight',

and:

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help(Part.BezierCurve)

will print:

Help on class BezierCurve in module Part:

class BezierCurve(BoundedCurve)
| Describes a rational or non-rational Bezier curve:
| -- a non-rational Bezier curve is defined by a table of poles (also called control points)
| -- a rational Bezier curve is defined by a table of poles with varying weights
|
| Constructor takes no arguments.
|
| Example usage:
| p1 = Base.Vector(-1, 0, 0)
| p2 = Base.Vector(0, 1, 0.2)
| p3 = Base.Vector(1, 0, 0.4)
| p4 = Base.Vector(0, -1, 1)
|
| bc = BezierCurve()
| bc.setPoles([p1, p2, p3, p4])
| curveShape = bc.toShape()
| ...


| insertPoleAfter(...)
| Inserts after the pole of index.
|
| insertPoleBefore(...)
| Inserts before the pole of index.
|
| interpolate(...)
| Interpolates a list of constraints.
| Each constraint is a list of a point and some optional derivatives
| An optional list of parameters can be passed. It must be of same size as constraint list.
| Otherwise, a simple uniform parametrization is used.
| Example :
| bezier.interpolate([[pt1, deriv11, deriv12], [pt2,], [pt3, deriv31]], [0, 0.4, 1.0])
|
...
| removePole(...)
| Removes the pole of index Index from the table of poles of this Bezier curve.
| If this Bezier curve is rational, it can become non-rational.
|
|
....
setPole(...)
| Set a pole of the Bezier curve.
|
| setPoles(...)
| Set the poles of the Bezier curve.
|
| Takes a list of 3D Base.Vector objects.
|
| setWeight(...)
| (id, weight) Set a weight of the Bezier curve.

So there are plenty of information if you know how to get them!

Regards

Carlo D.