beizer-curves

A python library for generating beizer curves.

Installation

pip install beizer-curves

Usage

def beizer_curve(
    points,
    output_points_count: int,
    destructive: bool = False,
    dtype: np.dtype = np.int64,
):

Generate a beizer curve.

• points - Knots in format: [[x1, x2, ..., xn], [y1, y2, ..., yn], [z1, z2, ..., zn]].
• output_points_count - How many points of the curve to generate.
• destructive - Allow function to modify points array. Don't set to true, if you want to use points array later.
• dtype - dtype of array of returned points of the curve.

Points of a curve are returned in format: [[x1, x2, ..., xn], [y1, y2, ..., yn], [z1, z2, ..., zn]], where n is output_points_count.

def random_beizer_curve(
    start_point,
    end_point,
    output_points_count: int,
    random_points_count: int = 1,
    point_spread: float = 1,
    noise_max_offset: float = 0,
    noise_rate: float = 0.5,
    dtype=np.int64,
    return_forming_points: bool = False,
):

Generate a random beizer curve, which starts at start_point and ends at end_point.

• start_point, end_point - coordinates of start and end points of curve in format [x, y, z, ...].

• output_points_count - How many points of the curve to generate.

  if output_points_count < 0:
       output_points_count = math.ceil(distance / -output_points_count)
  

  Where distance is distance between start and end.

• random_points_count - How many knots to generate.

• point_spread - A scale of a rectangular figure with corners of start_point and end_point, in bounds of which random knots are generated. Has to be > 0.

• noise_max_offset - Max offset of a curve point.

  if output_points_count < 0:
      output_points_count = math.ceil(distance / -output_points_count)
  

  Where distance is distance between start and end.

• noise_rate - A part of curve points to apply noise offset to. Has to belong to [0; 1].

• dtype - dtype array of returned points of the curve.

• return_forming_points - return points, curve if return_forming_points else curve, where points are randomly generated knots

Usage example

import random

import matplotlib.pyplot as plt
import numpy as np

from beizer_curves import *

def plot_curve(points_count, i):
    start = [random.randrange(1, 2000), random.randrange(1, 2000)]
    noise = -200 * i
    end = [random.randrange(1, 2000), random.randrange(1, 2000)]
    points, curve = random_beizer_curve(
        start,
        end,
        output_points_count=50,
        random_points_count=points_count,
        noise_max_offset=noise,
        noise_rate=0.25,
        dtype=np.float64,
        return_forming_points=True,
    )

    fig = plt.figure()
    plt.axis("equal")
    plt.scatter(curve[0], curve[1])
    plt.scatter(points[0], points[1], color='red')
    fig.savefig(f"example_{points_count}_{i + 1}.png")

Example curves