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Diffstat (limited to 'bruder.py')
| -rw-r--r-- | bruder.py | 169 |
1 files changed, 169 insertions, 0 deletions
diff --git a/bruder.py b/bruder.py new file mode 100644 index 0000000..b774f4e --- /dev/null +++ b/bruder.py @@ -0,0 +1,169 @@ +#!/usr/bin/env python3 + +import tempfile +import re +import copy +import subprocess +import shlex +import os +import sys +import math +from pathlib import Path + +import click +from bs4 import BeautifulSoup + +from svg_util import setup_svg, Tag, parse_path_d, Transform + + +def run_cargo_command(binary, *args, **kwargs): + cmd_args = [] + for key, value in kwargs.items(): + if value is not None: + if value is False: + continue + + cmd_args.append(f'--{key.replace("_", "-")}') + + if value is not True: + cmd_args.append(value) + cmd_args.extend(map(str, args)) + + # By default, try a number of options: + candidates = [ + # somewhere in $PATH + binary, + # wasi-wrapper in $PATH + f'wasi-{binary}', + # in user-local cargo installation + Path.home() / '.cargo' / 'bin' / binary, + # wasi-wrapper in user-local pip installation + Path.home() / '.local' / 'bin' / f'wasi-{binary}', + # next to our current python interpreter (e.g. in virtualenv) + str(Path(sys.executable).parent / f'wasi-{binary}') + ] + + # if envvar is set, try that first. + if (env_var := os.environ.get(binary.upper())): + candidates = [env_var, *candidates] + + for cand in candidates: + try: + res = subprocess.run([cand, *cmd_args], check=True) + break + except FileNotFoundError: + continue + else: + raise SystemError(f'{binary} executable not found') + + +@click.group() +def cli(): + pass + +@cli.command() +@click.option('--num-rows', type=int, default=5, help='Number of tapes') +@click.option('--tape-width', type=float, default=24, help='Width of tape') +@click.option('--tape-border', type=float, default=3, help='Width of empty border at the edges of the tape in mm') +@click.option('--tape-spacing', type=float, default=2, help='Space between tapes') +@click.option('--tape-length', type=float, default=250, help='Length of tape segments') +@click.option('--magic-color', type=str, default='#cc0000', help='SVG color of tape') +@click.argument('output_svg', type=click.File(mode='w'), default='-') +def template(num_rows, tape_width, tape_border, tape_spacing, tape_length, magic_color, output_svg): + pitch = tape_width + tape_spacing + tags = [Tag('g', inkscape__layer='Layer 1', inkscape__groupmode='layer', id='layer1', children=[ + Tag('g', id='g1', children=[ + Tag('g', id=f'tape{i}', children=[ + Tag('path', id=f'tape{i}_outline', fill='none', stroke='black', opacity='0.3', stroke_width=f'{tape_width}px', + d=f'M 0 {tape_width/2 + i*pitch} {tape_length} {tape_width/2 + i*pitch}'), + Tag('path', id=f'tape{i}_printable_area', fill='none', stroke=magic_color, stroke_width=f'{tape_width-2*tape_border}px', + d=f'M 0 {tape_width/2 + i*pitch} {tape_length} {tape_width/2 + i*pitch}'), + ]) + for i in range(num_rows) + ]) + ])] + + bounds = (0, 0), (tape_length, num_rows*tape_width + (num_rows-1)*tape_spacing) + svg = setup_svg(tags, bounds, margin=tape_width, inkscape=True) + output_svg.write(str(svg)) + +@cli.command() +@click.option('--magic-color', type=str, default='#cc0000', help='SVG color of tape') +@click.argument('input_svg', type=click.File(mode='r'), default='-') +def dither(input_svg, magic_color): + tmpdir = Path('/tmp/foo') # FIXME debug + with tempfile.NamedTemporaryFile('w', suffix='.svg') as tmp_in_svg,\ + tempfile.NamedTemporaryFile('r', suffix='.svg') as tmp_out_svg: + tmp_in_svg.write(input_svg.read()) + tmp_in_svg.flush() + + try: + run_cargo_command('usvg', *shlex.split(os.environ.get('USVG_OPTIONS', '')), tmp_in_svg.name, tmp_out_svg.name) + except SystemError: + raise ClickException('Cannot find usvg. Please install usvg using cargo, or pass the full path to the usvg binary in the USVG environment variable.') + + soup = BeautifulSoup(tmp_out_svg.read(), 'xml') + + print(soup.prettify()) + for i, path in enumerate(list(soup.find_all('path'))): + if path.get('stroke').lower() != magic_color: + continue + path_id = path.get('id', '<no id?>') + + commands = list(parse_path_d(path.get('d', ''))) + if len(commands) != 2: + print('Path', path_id, 'has magic color, but has more than two nodes. Ignoring.', file=sys.stderr) + continue + if commands[1][0] != 'L': + print('Path', path_id, 'has magic color, but has a curve. Ignoring.', file=sys.stderr) + continue + if commands[0][0] != 'M': + print('Path', path_id, 'has magic color, but is malformed (does not start with M command). Ignoring.', file=sys.stderr) + continue + (_c1, (x1, y1)), (_c2, (x2, y2)) = commands + + mat = Transform.parse_svg(path.get('transform', '')) + for parent in path.parents: + xf = Transform.parse_svg(parent.get('transform', '')) + mat = xf * mat # make sure we apply the parent transform from the left, i.e. after the child transform + x1, y1 = mat.transform_point(x1, y1) + x2, y2 = mat.transform_point(x2, y2) + path_len = math.dist((x1, y1), (x2, y2)) + + if math.isclose(path_len, 0, abs_tol=1e-3): + print('Path', path_id, 'has magic color, but has (almost) zero length. Ignoring.', file=sys.stderr) + continue + + if not (stroke_w := path.get('stroke-width')): + print('Path', path_id, 'has magic color, but has no defined stroke width. Ignoring.', file=sys.stderr) + continue + stroke_w = float(re.match('[-0-9.]+', stroke_w).group(0)) + + path_angle = math.atan2((y2-y1), (x2-x1)) + dx, dy = (x2-x1)/path_len, (y2-y1)/path_len + + sx1, sy1 = mat.transform_point(x1-dy*stroke_w/2, y1+dx*stroke_w/2) + sx2, sy2 = mat.transform_point(x1+dy*stroke_w/2, y1-dx*stroke_w/2) + stroke_w = round(math.dist((sx1, sy1), (sx2, sy2)), 3) + + out_soup = copy.copy(soup) + + print(f'found path {path_id} of length {path_len:2f} and angle {math.degrees(path_angle):.1f} deg with physical stroke width {stroke_w:.2f} from ({x1:.2f}, {y1:.2f}) to ({x2:.2f}, {y2:.2f})', file=sys.stderr) + out_soup.find('svg').append(out_soup.new_tag('path', fill='none', stroke='blue', stroke_width=f'24px', + d=f'M {x1} {y1} L {x2} {y2}')) + xf = Transform.translate(0, stroke_w/2) * Transform.rotate(-path_angle) * Transform.translate(-x1, -y1) + g = out_soup.new_tag('g', id='transform-group', transform=xf.as_svg()) + k = list(out_soup.find('svg').contents) + for c in k: + g.append(c.extract()) + out_soup.find('svg').append(g) + out_soup.find('svg')['viewBox'] = f'0 0 {path_len} {stroke_w}' + out_soup.find('svg')['width'] = f'{path_len}mm' + out_soup.find('svg')['height'] = f'{stroke_w}mm' + + with open(f'/tmp/baz-{i}.svg', 'w') as f: + f.write(out_soup.prettify()) + + +if __name__ == '__main__': + cli() |