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#!/usr/bin/env python3
import math
import itertools
import textwrap
import click
from reedmuller import reedmuller
class Tag:
""" Helper class to ease creation of SVG. All API functions that create SVG allow you to substitute this with your
own implementation by passing a ``tag`` parameter. """
def __init__(self, name, children=None, root=False, **attrs):
if (fill := attrs.get('fill')) and isinstance(fill, tuple):
attrs['fill'], attrs['fill-opacity'] = fill
if (stroke := attrs.get('stroke')) and isinstance(stroke, tuple):
attrs['stroke'], attrs['stroke-opacity'] = stroke
self.name, self.attrs = name, attrs
self.children = children or []
self.root = root
def __str__(self):
prefix = '<?xml version="1.0" encoding="utf-8"?>\n' if self.root else ''
opening = ' '.join([self.name] + [f'{key.replace("__", ":").replace("_", "-")}="{value}"' for key, value in self.attrs.items()])
if self.children:
children = '\n'.join(textwrap.indent(str(c), ' ') for c in self.children)
return f'{prefix}<{opening}>\n{children}\n</{self.name}>'
else:
return f'{prefix}<{opening}/>'
@classmethod
def setup_svg(kls, tags, bounds, margin=0, unit='mm', pagecolor='white', inkscape=False):
(min_x, min_y), (max_x, max_y) = bounds
if margin:
min_x -= margin
min_y -= margin
max_x += margin
max_y += margin
w, h = max_x - min_x, max_y - min_y
w = 1.0 if math.isclose(w, 0.0) else w
h = 1.0 if math.isclose(h, 0.0) else h
if inkscape:
tags.insert(0, kls('sodipodi:namedview', [], id='namedview1', pagecolor=pagecolor,
inkscape__document_units=unit))
namespaces = dict(
xmlns="http://www.w3.org/2000/svg",
xmlns__xlink="http://www.w3.org/1999/xlink",
xmlns__sodipodi='http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd',
xmlns__inkscape='http://www.inkscape.org/namespaces/inkscape')
else:
namespaces = dict(
xmlns="http://www.w3.org/2000/svg",
xmlns__xlink="http://www.w3.org/1999/xlink")
return kls('svg', tags,
width=f'{w}{unit}', height=f'{h}{unit}',
viewBox=f'{min_x} {min_y} {w} {h}',
style=f'background-color:{pagecolor}',
**namespaces,
root=True)
@click.command()
@click.option('-h', '--height', type=float, default=20, help='Bar height in mm')
@click.option('-t/-n', '--text/--no-text', default=True, help='Whether to add text containing the data under the bar code')
@click.option('-f', '--font', default='sans-serif', help='Font for the text underneath the bar code')
@click.option('-s', '--font-size', type=float, default=12, help='Font size for the text underneath the bar code in points (pt)')
@click.option('-b', '--bar-width', type=float, default=1.0, help='Bar width in mm')
@click.option('-m', '--margin', type=float, default=3.0, help='Margin around bar code in mm')
@click.option('-c', '--color', default='black', help='SVG color for the bar code')
@click.option('--text-color', default=None, help='SVG color for the text (defaults to the bar code\'s color)')
@click.option('--dpi', type=float, default=96, help='DPI value to assume for internal SVG unit conversions')
@click.argument('data')
@click.argument('outfile', type=click.File('w'), default='-')
def cli(data, outfile, height, text, font, font_size, bar_width, margin, color, text_color, dpi):
data = int(data, 16)
text_color = text_color or color
NUM_BITS = 26
data_bits = [bool(data & (1<<i)) for i in range(NUM_BITS)]
data_encoded = itertools.chain(*[
(a, not a) for a in data_bits
])
data_encoded = [True, False, True, False, *data_encoded, False, True, True, False, True]
width = len(data_encoded) * bar_width
# 1 px = 0.75 pt
pt_to_mm = lambda pt: pt / 0.75 /dpi * 25.4
font_size = pt_to_mm(font_size)
total_height = height + font_size*2
tags = []
for key, group in itertools.groupby(enumerate(data_encoded), key=lambda x: x[1]):
if key:
group = list(group)
x0, _key = group[0]
w = len(group)
tags.append(Tag('path', stroke=color, stroke_width=w, d=f'M {(x0 + w/2)*bar_width} 0 l 0 {height}'))
if text:
tags.append(Tag('text', children=[f'{data:07x}'],
x=width/2, y=height + 0.5*font_size,
font_family=font, font_size=f'{font_size:.3f}px',
text_anchor='middle', dominant_baseline='hanging',
fill=text_color))
outfile.write(str(Tag.setup_svg(tags, bounds=((0, 0), (width, total_height)), margin=margin)))
if __name__ == '__main__':
cli()
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