How to use Bezier_points and Bezier_polygon ?

[Frank-bool]

In my job, I need to use bezier curve. But I reported an error after compiling. So how do I use the Bessel function? How do I give the coordinates?

b_points = solid.splines.bezier_points([[0,0], [2,6],[5,10],[15,5]], 10)

Error： File line 18, in <module> b_points = sd.splines.bezier_points([[0,0], [2,6],[5,10],[15,5]], 10) File "D:\Anaconda\lib\site-packages\solid\splines.py", line 162, in bezier_points points.append(_point_along_bez4(*controls, u)) File "D:\Anaconda\lib\site-packages\solid\splines.py", line 166, in _point_along_bez4 x = _bez03(u)*p0.x + _bez13(u)*p1.x + _bez23(u)*p2.x + _bez33(u)*p3.x AttributeError: 'list' object has no attribute 'x'

I think it's a question of giving coordinates. So how do I give the coordinates correctly? Thank you for your help.

[etjones]

That's a great question, Frank. It looks like bezier_points() requires a list of Point2 objects, and that's what's causing the errror. That shouldn't be the case, and I'm going to fix bezier_points() so it accepts a list of lists like you have.

For the moment, though, you can call the function solid.utils.euclidify() to change that list of x,y pairs to Point2 objects.

[etjones]

Here's a demo program that works right now. I'll add a comment when I release the fix later today:

#! /usr/bin/env python

from solid import polygon, scad_render_to_file
from solid.splines import bezier_points
from solid.utils import euclidify

SEGMENTS = 48

def bezier_test():
    points_list = euclidify([[0,0], [2,6],[5,10],[15,5]])
    b_points = bezier_points(points_list, 10)
    poly = polygon(b_points)

    # This will throw an exception until I put a fix in. Should work
    # in the next release of SolidPython
    # b_points_list = bezier_points([[0,0], [2,6],[5,10],[15,5]], 10)

    return poly

if __name__ == '__main__':
    poly = bezier_test()
    scad_render_to_file(poly, file_header='$fn = %s;' % SEGMENTS, include_orig_code=True)

[etjones]

Fixed in v0.4.8, now available from PyPi with pip install solidpython