/
hex_generator.py
executable file
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/
hex_generator.py
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#!/usr/bin/env python3
import argparse
from collections import namedtuple
import math
from svgwrite import Drawing
Hexagon = namedtuple('Hex', 'vertices type')
def generate_hexagonal_board(radius=2):
"""
Creates a board with hexagonal shape.
The board includes all the field within radius from center of the board.
Setting radius to 0 generates a board with 1 hexagon.
"""
def hex_distance(a, b): return int(abs(a[0] - b[0]) + abs(a[1] - b[1]) + abs(a[0] + a[1] - b[0] - b[1])) / 2
width = height = 2 * radius + 1
board = [[0] * height for _ in range(width)]
center = (radius, radius)
for x in range(width):
for y in range(height):
board[x][y] = int(hex_distance((x, y), center) <= radius)
return board
def generate_triangular_board(edge=7, mirrored=False):
"""
Creates a board with a shape of equilateral triangle.
The size of the triangle's side (in fields) is specified by the edge argument.
By default the resulting board will be a triangle pointing down (pointy top)
of right (flat top). Setting mirrored to True changes this to a triangle
pointing up or left, respectively.
"""
def is_field(x, y): return x + y < edge if not mirrored else x + y + 1 >= edge
board = [[int(is_field(x, y)) for y in range(edge)] for x in range(edge)]
return board
def generate_parallelogrammatic_board(width=5, height=5):
"""
Creates a board with a shape of a parallelogram.
Width and height specify the size (in fields) of the board.
"""
return [[1] * height for _ in range(width)]
def write_board_to_text_file(board, file_name):
"""
Saves a board to a text file of given name.
If the board is not a rectangle, missing fields will be filled with 0.
"""
max_len = max(len(column) for column in board)
for column in board:
while len(column) < max_len:
column.append(0)
board = [list(row) for row in zip(*board)]
with open(file_name, 'w') as board_file:
for row in board:
line = ' '.join(str(field) for field in row)
board_file.write(line + '\n')
def read_board_from_text_file(file_name):
"""
Reads a board from a text file of given name.
If the file does not contain a rectangular board, missing
fields will be filled with 0.
"""
with open(file_name) as board_file:
lines = board_file.readlines()
board = [[int(x) for x in line.split()] for line in lines]
max_len = max(len(row) for row in board)
for row in board:
while len(row) < max_len:
row.append(0)
board = [list(x) for x in zip(*board)]
return board
def write_board_to_svg_file(board, file_name, hex_edge=50, hex_offset=0,
board_padding=None, pointy_top=True, trim_board=True, style=None):
"""
Writes given board to a svg file of given name.
:param board: 2 dimensional list of fields, each represented as a number
:param file_name name of the output file
:param hex_edge: length of hexagon's side (in pixels)
:param hex_offset: distance between side of one hexagon and its neighbour (in pixels)
:param board_padding padding of the board (in pixels)
:param pointy_top: specifies if hexagons should be pointy topped or flat topped
:param trim_board: if True, fields with a value 0 will be removed during transformation
:param style css style (as string)
"""
if board_padding is None:
board_padding = hex_edge
styles = ['.board { fill: white } .hex-field { fill: white; stroke: black } .hex-field-0 { fill: black }']
if style is not None:
styles.append(style)
hexagons = transform_board_into_hexagons(board, hex_edge, hex_offset, pointy_top, trim_board)
min_x, min_y, max_x, max_y = calculate_bounding_box(hexagons)
offset = (board_padding - min_x, board_padding - min_y)
hexagons = move_hexagons_by_offset(hexagons, offset)
board_size = (2 * board_padding + max_x - min_x, 2 * board_padding + max_y - min_y)
svg_image = create_svg_image(styles, board_size, hexagons)
svg_image.saveas(file_name)
return svg_image
def transform_board_into_hexagons(board, hex_edge, hex_offset, pointy_top=True, trim_board=True):
"""
Converts a board to a list of hexagons.
:param board: 2 dimensional list of fields, each represented as a number
:param hex_edge: length of hexagon's side
:param hex_offset: distance between side of one hexagon and its neighbour
:param pointy_top: specifies if hexagons should be pointy topped or flat topped
:param trim_board: if True, fields with a value 0 will be removed during transformation
:return: list of hexagons, each as a tuple (vertices, type)
"""
hexagons = []
x_axis, y_axis = create_axis(pointy_top)
scale = hex_edge * math.sqrt(3) + hex_offset
for x in range(len(board)):
for y in range(len(board[x])):
if not board[x][y] and trim_board:
continue
coord_x = (x_axis[0] * x + y_axis[0] * y) * scale
coord_y = (x_axis[1] * x + y_axis[1] * y) * scale
hex_center = (coord_x, coord_y)
vertices = calculate_vertices_for_one_hexagon(hex_center, hex_edge, pointy_top)
hexagons.append(Hexagon(vertices, board[x][y]))
return hexagons
def create_axis(pointy_top):
"""
Creates 2 axes (X and Y) for axial coordinate system.
The angle between both axes is 60 degrees. Each axis has a length of 1.
Depending on pointy_top setting, there are 2 possible sets of axes:
* X axis pointing right (as standard cartesian X axis), Y axis rotated
30 degrees anti-clockwise from its normal position
* Y axis pointing down (as standard cartesian Y axis), X axis rotated 30 degrees clockwise from its normal position
:param pointy_top: if True, X axis will point right, otherwise Y axis will point down
:return: a tuple of 2 vectors (X, Y), each containing x and y coordinates of one axis
"""
x_angle = 0 if pointy_top else 30
y_angle = x_angle + 60
x_axis = (math.cos(math.radians(x_angle)), math.sin(math.radians(x_angle)))
y_axis = (math.cos(math.radians(y_angle)), math.sin(math.radians(y_angle)))
return x_axis, y_axis
def calculate_vertices_for_one_hexagon(center, edge, pointy_top):
"""
Calculates the vertices (corners) of one hexagon.
:param center: center point of a hexagon as a tuple (x, y)
:param edge: size of a hexagon edge
:param pointy_top: if True, hexagon will be oriented horizontally, otherwise vertically
:return: list of vertices for a given hexagon
"""
vertices = []
x, y = center
start_angle = 0 if pointy_top else 30
for i in range(6):
angle = start_angle + (360 * i / 6)
radian = math.radians(angle)
vertex_x = x + edge * math.sin(radian)
vertex_y = y + edge * math.cos(radian)
vertices.append((vertex_x, vertex_y))
return vertices
def calculate_bounding_box(hexagons):
"""
Calculates the dimensions on a minimal bounding box (MBB) for given hexagons.
MBB is the smallest rectangle that all given objects can fit into.
:param hexagons iterable of hexagons (tuples in a form of (vertices, type) )
:returns MBB as a tuple (min_x, min_y, max_x, max_y)
"""
vertices = [vertex for hexagon in hexagons for vertex in hexagon.vertices]
min_x = min(v[0] for v in vertices)
min_y = min(v[1] for v in vertices)
max_x = max(v[0] for v in vertices)
max_y = max(v[1] for v in vertices)
return min_x, min_y, max_x, max_y
def move_hexagons_by_offset(hexagons, offset):
"""
Adds given offset to each vertex in each given hexagon.
:param hexagons iterable of hexagons (tuples in a form of (vertices, type) )
:param offset offset in a form of a tuple (x_offset, y_offset)
:returns new list of hexagons, with modifies vertices
"""
moved_hexagons = []
for hexagon in hexagons:
vertices = [(v[0] + offset[0], v[1] + offset[1]) for v in hexagon.vertices]
moved_hexagons.append(Hexagon(vertices, hexagon.type))
return moved_hexagons
def create_svg_image(styles, board_size, hexagons):
"""
Creates SVG drawing.
The drawing contains all given css styles, a board (background rectangle)
of given size and all given hexagons. The board can be styled using '.board'.
All hexagonal fields can be styled using '.hex-field'. Fields can be also
styled using 'hex-field-X', where X is the type of the field.
:param styles iterable of css styles (strings)
:param board_size tuple representing board size (width, height)
:param hexagons iterable of hexagons (tuples in a form of (vertices, type) )
:returns SVG Drawing object
"""
svg_image = Drawing()
for style in styles:
svg_image.add(svg_image.style(style))
svg_image.add(svg_image.rect(size=board_size, class_='board'))
for hexagon in hexagons:
svg_image.add(svg_image.polygon(hexagon.vertices, class_='hex-field hex-field-%d' % hexagon.type))
return svg_image
def main():
"""
Creates an argument parser and handles command line execution of this program.
"""
parser = argparse.ArgumentParser(description='Generate a board with hexagonal fields (as SVG file).')
parser.add_argument('-o', '--output', help='name of the output file')
parser.add_argument('-E', '--export', action='store_true',
help='instead of generating SVG file, the program will generate text file with a board')
board_options = parser.add_argument_group('Board options')
board_options.add_argument('-i', '--input', help='name of the text file with a board (overrides other options)')
board_options.add_argument('-t', '--type', help='type of the board', choices=['hex', 'par', 'tri'], default='hex')
board_options.add_argument('-R', '--radius', type=int, default=2, help='radius (hexagonal board)')
board_options.add_argument('-W', '--width', type=int, default=5, help='width (parallelogrammatic board)')
board_options.add_argument('-H', '--height', type=int, default=5, help='height (parallelogrammatic board)')
board_options.add_argument('-S', '--size', type=int, default=7, help='edge size (triangular board)')
board_options.add_argument('-M', '--mirrored', action='store_true', help='mirrors the board (triangular board)')
svg_options = parser.add_argument_group('SVG options')
svg_options.add_argument('-e', '--edge', type=int, default=50, help='length (in pixels) of hex edge')
svg_options.add_argument('-s', '--spacing', type=int, default=0, help='spacing (in pixels) between hexes')
svg_options.add_argument('-p', '--padding', type=int, help='board padding (in pixels)')
svg_options.add_argument('-f', '--flat-top', action='store_true', help='changes hex orientation to vertical')
svg_options.add_argument('-a', '--all', action='store_true', help='show all fields, including 0')
svg_options.add_argument('-c', '--css', help='a string containing a css style to be applied to the svg file. '
'Background can be styled using ".board". Fields can be styled using '
'".hex-field" (all fields) and .hex-field-X (fields of type X).')
args = parser.parse_args()
if args.input:
board = read_board_from_text_file(args.input)
elif args.type == 'par':
board = generate_parallelogrammatic_board(args.width, args.height)
elif args.type == 'tri':
board = generate_triangular_board(args.size, args.mirrored)
else:
board = generate_hexagonal_board(args.radius)
if args.export:
output_file_name = args.output if args.output else 'board.txt'
write_board_to_text_file(board, output_file_name)
else:
output_file_name = args.output if args.output else 'board.svg'
write_board_to_svg_file(board, output_file_name, args.edge, args.spacing, args.padding, not args.flat_top,
not args.all, args.css)
if __name__ == '__main__':
main()