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🏠 Root / opt / cloudlinux / venv / lib / python3.11 / site-packages / svgwrite / extensions /

✏️ Editing: shapes.py

"""
Extension to create and manipulate shapes
"""
# Copyright (c) 2019 Christof Hanke (christof.hanke@induhviduals.de)
# License: MIT License
import math

def ngon(num_corners, edge_length=None, radius=None, rotation=0.):
    """
    Returns the corners of a regular polygon as iterable of (x, y) tuples. The polygon size is determined by the
    `edge_length` or the `radius` argument. If both are given `edge_length` will be taken.

Args:
        num_corners: count of polygon corners
        edge_length: length of polygon side
        radius: circum radius
        rotation: rotation angle in radians

Returns: iterable of (x, y) tuples

"""
    if num_corners < 3:
        raise ValueError('Argument `num_corners` has to be greater than 2.')
    if edge_length is not None:
        radius = edge_length / 2 / math.sin(math.pi / num_corners)
    elif radius is not None:
        if radius <= 0.:
            raise ValueError('Argument `radius` has to be greater than 0.')
    else:
        raise ValueError('Argument `edge_length` or `radius` required.')

delta = 2 * math.pi / num_corners
    angle = rotation
    for _ in range(num_corners):
        yield (radius * math.cos(angle), radius * math.sin(angle))
        angle += delta

def star(spikes, r1, r2, rotation=0.):
    """
    Create a star shape as iterable of (x, y) vertices.

Argument `spikes` defines the count of star spikes, `r1` defines the radius of the "outer" vertices and `r2`
    defines the radius of the "inner" vertices, but this does not mean that `r1` has to greater than `r2`.

Args:
        spikes: spike count
        r1: radius 1
        r2: radius 2
        rotation: rotation angle in radians

Returns: iterable of (x, y) tuples

"""
    if spikes < 3:
        raise ValueError('Argument `spikes` has to be greater than 2.')
    if r1 <= 0.:
        raise ValueError('Argument `r1` has to be greater than 0.')
    if r2 <= 0.:
        raise ValueError('Argument `r2` has to be greater than 0.')

corners1 = ngon(spikes, radius=r1, rotation=rotation)
    corners2 = ngon(spikes, radius=r2, rotation=math.pi/spikes+rotation)
    for s1, s2 in zip(corners1, corners2):
        yield s1
        yield s2

def translate(vertices, delta_x, delta_y):
    """
    Translates `vertices` about `delta_x` and `delta_y`

Args:
         vertices: iterable of (x, y) tuples
         delta_x: translation in x axis
         delta_y: translation in y axis

Returns: iterable of (x, y) tuples

"""
    for x, y in vertices:
        yield (x + delta_x, y + delta_y)

def scale(vertices, scale_x, scale_y):
    """
    Scales `vertices` about `scale_x` and `scale_y`

Args:
         vertices: iterable of (x, y) tuples
         scale_x: scaling factor in x axis direction
         scale_y: scaling factor in y axis direction

Returns: iterable of (x, y) tuples

"""
    for x, y in vertices:
        yield (x * scale_x, y * scale_y)

def rotate(vertices, delta):
    """
    Rotates `vertices` about `delta` degrees around the origin (0, 0).

Args:
         vertices: iterable of (x, y) tuples
         delta: rotation angle in radians

Returns: iterable of (x, y) tuples

"""
    for x, y in vertices:
        r = math.hypot(x, y)
        angle = math.atan2(y, x) + delta
        yield (r * math.cos(angle), r * math.sin(angle))

def centroid(vertices):
    """
    Returns the centroid of a series of `vertices`.

"""
    k, c_x, c_y = 0, 0, 0
    for x, y in vertices:
        c_x += x
        c_y += y
        k += 1
    return c_x / k, c_y / k