def full_circle2(radius=1):
""" Generates a NURBS full circle from 7 control points.
:param radius: radius of the circle
:type radius: int, float
:return: a NURBS curve
:rtype: NURBS.Curve2D
"""
if radius <= 0:
raise ValueError("Curve radius cannot be less than and equal to zero")
# Control points for a unit circle
control_points = [[1.0, 0.5, 1.0], [0.0, 1.0, 0.5], [-1.0, 0.5, 1.0],
[-1.0, -0.5, 0.5], [0.0, -1.0, 1.0], [1.0, -0.5, 0.5],
[1.0, 0.5, 1.0]]
# Set radius
ctrlpts = []
if radius != 1:
for point in control_points:
npt = [i * radius for i in point[0:2]]
npt.append(point[-1])
ctrlpts.append(npt)
else:
ctrlpts = control_points
# Generate the curve
curve = NURBS.Curve2D()
curve.degree = 2
curve.ctrlpts = ctrlpts
curve.knotvector = [0, 0, 0, 0.33, 0.33, 0.66, 0.66, 1, 1, 1]
# Return the generated curve
return curve
# -*- coding: utf-8 -*-
"""
Examples for the NURBS-Python Package
Released under MIT License
Developed by Onur Rauf Bingol (c) 2017
"""
import os
from geomdl import NURBS
# Fix file path
os.chdir(os.path.dirname(os.path.realpath(__file__)))
# Create a NURBS curve instance (full circle)
curve = NURBS.Curve2D()
# Set evaluation delta
curve.delta = 0.01
# Set up curve
curve.read_ctrlpts_from_txt("ex_curve04.cptw")
curve.degree = 2
# Use a specialized knot vector
curve.knotvector = [0, 0, 0, 0.25, 0.25, 0.5, 0.5, 0.75, 0.75, 1, 1, 1]
# Evaluate curve
curve.evaluate()
# Save control points and evaluated curve points
curve.save_curvepts_to_csv("curvepts04_orig.csv")
curve.save_ctrlpts_to_csv("ctrlpts04_orig.csv")