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temo.py
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temo.py
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#!/usr/bin/env python3
"""
Temo
Creates a colorful maze inspired by a famous one line C64 BASIC
program.
Copyright © 2020 Christian Rosentreter
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as published
by the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
$Id: temo.py 164 2020-07-09 12:18:58Z tokai $
"""
import random
import argparse
import math
import sys
import colorsys
import logging
from enum import Enum
import xml.etree.ElementTree as xtree
__author__ = 'Christian Rosentreter'
__version__ = '1.3'
__all__ = []
class Direction(Enum):
"""<insert description>"""
NORTH = 1
SOUTH = 2
EAST = 3
WEST = 4
class Slope(Enum):
"""<insert description>"""
UP = 0 # "/"
DOWN = 1 # "\"
class DLine():
"""A diagonal line segment inside a square."""
def __init__(self, slope, hue, x1, y1, x2, y2, angle=0):
self.slope = slope
self.hue = hue
if angle:
xc = (x1 + x2) / 2.0
yc = (y1 + y2) / 2.0
r = math.sqrt(math.pow(x2 - x1, 2.0) + math.pow(y2 - y1, 2.0)) / 2.0
a = -math.radians((-45.0 if slope == Slope.DOWN else 45) + angle)
self.x1 = math.sin(a) * r + xc
self.y1 = math.cos(a) * r + yc
self.x2 = math.sin(a + math.pi) * r + xc
self.y2 = math.cos(a + math.pi) * r + yc
else:
self.x1 = x1 if (slope == Slope.DOWN) else x2
self.x2 = x2 if (slope == Slope.DOWN) else x1
self.y1 = y1
self.y2 = y2
def __repr__(self):
return '\\' if (self.slope == Slope.DOWN) else '/'
def hue_blend(a, b):
"""Blends two angular hue values with linear interpolation."""
if a > b:
a, b = b, a
d = b - a
if d > 180:
a += 360
return (a + ((b - a) / 2.0)) % 360
return a + (d / 2.0)
def lookup_hue(slope, x, y, rows, hue_shift_line):
"""Looks up a hue value or a pair of hue values from the already generated grid elements."""
hues = []
if y:
if slope == Slope.DOWN:
if x and (rows[y-1][x-1].slope == Slope.DOWN):
hues.append(rows[y-1][x-1].hue)
if rows[y-1][x].slope == Slope.UP:
hues.append(rows[y-1][x].hue)
else: # slope == Slope.UP
if rows[y-1][x].slope == Slope.DOWN:
hues.append(rows[y-1][x].hue)
if (x < len(rows[y-1]) - 1) and (rows[y-1][x+1].slope == Slope.UP):
hues.append(rows[y-1][x+1].hue)
if hues:
if len(hues) == 2:
return hue_blend(hues[0], hues[1])
return (hues[0] + hue_shift_line) % 360
return None
def hls_to_hex(hue, lightness, saturation):
"""Converts a HLS color triplet into a SVG hex string."""
return '#{:02x}{:02x}{:02x}'.format(*(int(c*255) for c in list(colorsys.hls_to_rgb(hue / 360, lightness, saturation))))
def main():
"""It's not just a single line of code, but what can we do? :)"""
ap = argparse.ArgumentParser(
description=('Creates a colorful maze inspired by a famous one line C64 BASIC program '
'(`10 PRINT CHR$(205.5+RND(1)); : GOTO 10\'). Output is generated as a set of vector '
'shapes in Scalable Vector Graphics (SVG) format and printed on the standard output '
'stream.'),
epilog='Report bugs, request features, or provide suggestions via https://github.com/the-real-tokai/macuahuitl/issues',
add_help=False,
)
g = ap.add_argument_group('Startup')
g.add_argument('-V', '--version', action='version', help="show version number and exit", version='%(prog)s {}'.format(__version__), )
g.add_argument('-h', '--help', action='help', help='show this help message and exit')
g = ap.add_argument_group('Algorithm')
g.add_argument('--columns', metavar='INT', type=int, help='number of grid columns [:11]', default=40)
g.add_argument('--rows', metavar='INT', type=int, help='number of grid rows [:11]', default=30)
g.add_argument('--scale', metavar='FLOAT', type=float, help='base scale factor of the grid elements [:10.0]', default=10.0)
g.add_argument('--random-seed', metavar='INT', type=int, help='fixed initialization of the random number generator for predictable results')
g = ap.add_argument_group('Miscellaneous')
g.add_argument('--frame', metavar='FLOAT', type=float, help='increase or decrease spacing around the maze [:20.0]', default=20.0)
g.add_argument('--stroke-width', metavar='FLOAT', type=float, help='width of the generated strokes [:2.0]', default=2.0)
g.add_argument('--background-color', metavar='COLOR', type=str, help='SVG compliant color specification or identifier; adds a background <rect> to the SVG output')
g.add_argument('--hue-shift', metavar='FLOAT', type=float, help='amount to rotate an imaginary color wheel before looking up new colors (in degrees) [:15.0]', default=15.0)
g.add_argument('--hue-shift-line', metavar='FLOAT', type=float, help='separate hue shift for continuous lines; if not passed `--hue-shift\' applies too')
g.add_argument('--best-path-width', metavar='FLOAT', type=float, help='show the best (aka the longest) path through the maze and set width of its marker line')
g = ap.add_argument_group('Schotter')
g.add_argument('--schotter-falloff', choices=('infinite', 'horizontal', 'vertical', 'radial', 'box', 'random'),
help='enable `George Nees\'-style randomizing rotations and offsets of the maze\'s line segments')
g.add_argument('--schotter-inverse', action='store_true', help='flip the schotter mapping of the selected mode')
g.add_argument('--schotter-rotation', metavar='FLOAT', type=float, help='rotational variance for schottering [:0.5]', default=0.5)
g.add_argument('--schotter-offset', metavar='FLOAT', type=float, help='positional variance for schottering [:0.25]', default=0.25)
g = ap.add_argument_group('Output')
g.add_argument('-o', '--output', metavar='FILENAME', type=str, help='optionally rasterize the generated vector paths and write the result into a PNG file (requires the `svgcairo\' Python module)')
g.add_argument('--output-size', metavar='INT', type=int, help='force pixel width of the raster image, height is automatically calculated; if omitted the generated SVG viewbox dimensions are used')
user_input = ap.parse_args()
# Generate data…
#
chaos = random.Random(user_input.random_seed)
scale = user_input.scale
frame = user_input.frame
rows = []
master_hue = chaos.uniform(0,360)
huesl = user_input.hue_shift if user_input.hue_shift_line is None else user_input.hue_shift_line
for y in range(0, user_input.rows):
# master_hue = (360 / user_input.rows * y) % 360
rows.append([])
for x in range(0, user_input.columns):
xoffset = 0
yoffset = 0
angle = 0
slope = chaos.choice([Slope.UP, Slope.DOWN])
hue = lookup_hue(slope, x, y, rows, huesl)
if hue is None:
hue = master_hue
master_hue = (master_hue + user_input.hue_shift) % 360
if user_input.schotter_falloff == 'infinite':
schotter_factor = 1.0
elif user_input.schotter_falloff == 'random':
schotter_factor = chaos.choice([0, 1.0])
elif user_input.schotter_falloff == 'vertical':
schotter_factor = 1.0 / (user_input.rows - 1) * y
elif user_input.schotter_falloff == 'horizontal':
schotter_factor = 1.0 / (user_input.columns - 1) * x
elif user_input.schotter_falloff == 'radial':
xc = (user_input.columns - 1) / 2.0
yc = (user_input.rows - 1) / 2.0
d = math.sqrt(math.pow(xc - x, 2.0) + math.pow(yc - y, 2.0)) / 2.0
schotter_factor = 1.0 / max(xc, yc) * d
elif user_input.schotter_falloff == 'box':
md = min(x, (user_input.columns - 1) - x, y, (user_input.rows - 1) - y) * 2.0
schotter_factor = 1.0 / max(user_input.columns - 1, user_input.rows - 1) * md
else:
schotter_factor = 0
#if schotter_factor > 1.0:
# print('WARNING: schotter_factor too big: {}'.format(schotter_factor), file=sys.stderr)
if user_input.schotter_inverse:
schotter_factor = 1.0 - schotter_factor
#schotter_factor = -(math.cos(math.pi * schotter_factor) - 1.0) / 2.0 # ease-in-out-sine
schotter_factor = schotter_factor * schotter_factor # ease-in-quad
if schotter_factor:
xoffset = chaos.uniform(-scale, scale) * schotter_factor * user_input.schotter_offset
yoffset = chaos.uniform(-scale, scale) * schotter_factor * user_input.schotter_offset
angle = chaos.uniform( -90, 90) * schotter_factor * user_input.schotter_rotation
rows[y].append(DLine(slope, hue,
(x * scale + frame) + xoffset,
(y * scale + frame) + yoffset,
(x * scale + scale + frame) + xoffset,
(y * scale + scale + frame) + yoffset,
angle
))
# Primitive path walking…
#
bestwalker = None
circle_pos = None
if user_input.best_path_width:
coords = []
for x in range(0, user_input.columns):
coords.append((x, -1, Direction.SOUTH))
coords.append((x, user_input.rows, Direction.NORTH))
for y in range(0, user_input.rows):
coords.append((-1, y, Direction.EAST))
coords.append((user_input.columns, y, Direction.WEST))
chaos.shuffle(coords)
offset = scale / 2.0
for pos in coords:
wx, wy, wd = pos
cx = (wx * scale) + frame + offset
cy = (wy * scale) + frame + offset
tempwalker = ['M{} {}{}{}'.format(cx, cy,
'v' if wd in (Direction.SOUTH, Direction.NORTH) else 'h',
offset if wd in (Direction.SOUTH, Direction.EAST) else -offset
)]
tx, ty = 1, 1
while True:
if wd == Direction.SOUTH:
wy += 1
if wy >= user_input.rows:
break
wd, tx, ty = (Direction.EAST, 1, 1) if (rows[wy][wx].slope == Slope.DOWN) else (Direction.WEST, -1, 1)
elif wd == Direction.WEST:
wx -= 1
if wx < 0:
break
wd, tx, ty = (Direction.NORTH, -1, -1) if (rows[wy][wx].slope == Slope.DOWN) else (Direction.SOUTH, -1, 1)
elif wd == Direction.EAST:
wx += 1
if wx >= user_input.columns:
break
wd, tx, ty = (Direction.SOUTH, 1, 1) if (rows[wy][wx].slope == Slope.DOWN) else (Direction.NORTH, 1, -1)
else: # wd == Direction.NORTH
wy -= 1
if wy < 0:
break
wd, tx, ty = (Direction.WEST, -1, -1) if (rows[wy][wx].slope == Slope.DOWN) else (Direction.EAST, 1, -1)
tempwalker.append('l{} {}'.format((offset * tx), (offset * ty)))
logging.debug('New position <%u×%u>, direction <%s>', wx, wy, wd)
logging.debug(tempwalker)
if bestwalker is None or len(tempwalker) > len(bestwalker):
bestwalker = tempwalker.copy()
circle_pos = (cx, cy)
# Generate SVG…
#
vbw = int((scale * user_input.columns) + (frame * 2.0))
vbh = int((scale * user_input.rows ) + (frame * 2.0))
svg = xtree.Element('svg', {'width':'100%', 'height':'100%', 'xmlns':'http://www.w3.org/2000/svg', 'viewBox':'0 0 {} {}'.format(vbw, vbh)})
title = xtree.SubElement(svg, 'title')
title.text = 'A Temo Artwork'
if user_input.background_color:
xtree.SubElement(svg, 'rect', {'id':'background', 'x':'0', 'y':'0', 'width':str(vbw), 'height':str(vbh), 'fill':user_input.background_color})
svg_g = xtree.SubElement(svg, 'g', {'id':'goto10', 'stroke-width':str(user_input.stroke_width), 'stroke-linecap':'round'})
for row_id, row in enumerate(rows):
for col_id, element in enumerate(row):
xtree.SubElement(svg_g, 'line', {
'id': 'line-{}x{}'.format(col_id + 1, row_id + 1),
'x1': str(element.x1),
'y1': str(element.y1),
'x2': str(element.x2),
'y2': str(element.y2),
'stroke': hls_to_hex(element.hue, 0.6, 0.5),
})
if bestwalker:
svg_g = xtree.SubElement(svg, 'g', {'id':'best_walker'})
wcolor = hls_to_hex(chaos.uniform(0, 360), 0.5, 0.8)
xtree.SubElement(svg_g, 'path', {
'd': ''.join(bestwalker),
'stroke-width': str(user_input.best_path_width),
'stroke': wcolor,
'stroke-linecap': 'round',
'stroke-linejoin': 'round',
'fill': 'none',
})
xtree.SubElement(svg_g, 'circle', {
'id': 'start_point',
'cx': str(circle_pos[0]),
'cy': str(circle_pos[1]),
'r': str(user_input.best_path_width),
'fill': wcolor,
})
rawxml = xtree.tostring(svg, encoding='unicode')
# Output…
#
if not user_input.output:
print(rawxml)
else:
try:
import os
from cairosvg import svg2png
svg2png(
bytestring = rawxml,
write_to = os.path.realpath(os.path.expanduser(user_input.output)),
output_width = user_input.output_size,
output_height = int(user_input.output_size * vbh / vbw) if user_input.output_size is not None else None
)
except ImportError as e:
print('Couldn\'t rasterize nor write a PNG file. Required Python module \'cairosvg\' is not available: {}'.format(str(e)), file=sys.stderr)
if __name__ == '__main__':
main()