jessikittyandClaude Opus 5
fbfd66d889
parse_group_spec / spec_from_groups let the page combine any parts onto one label, and plan_groups never breaks a hand-made group up. Text size now goes to 3x and means it: the name is sized first, the image shrinks out of its way, and the floor no longer rises with the setting - which is what truncated long names at large sizes. The meta line takes the leftover room instead of pushing itself off the label. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01Vunz4VLxAYDBnU5tLciLDC
884 lines
31 KiB
Python
884 lines
31 KiB
Python
"""
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Continuous-tape label rendering for the Brother VC-500W.
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Sheet labels (Avery etc.) are laid out in label_render.py as an HTML page.
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A tape printer is a different animal: one label at a time, fixed width, and
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the length is however long the content needs to be. So these are rendered as
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images at the printer's native resolution and sent to it over IPP.
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VC-500W facts this is built around:
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* 313 dpi, full colour, ZINK (no ink)
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* CZ tape in 9, 12, 19, 25 and 50mm widths
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* up to about 17 inches (431mm) per label
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* AirPrint, so it speaks IPP on port 631
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THE HOUSE LABEL SIZE
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--------------------
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Drawer labels are a fixed physical size, not "however long the text is":
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one part in the drawer 40 x 15 mm
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two parts in the drawer 40 x 20 mm
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They are laid ACROSS the tape - the 40mm spans the tape width, so each
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label only eats 15mm (or 20mm) of tape length. That needs 50mm tape, and it
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is about 2.7x cheaper than running the 40mm along the feed: 100 standard
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labels come to 1.5m of tape instead of 4m. Cut across the tape between
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labels and you get a 40 x 15mm sticker.
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"Fit tape width" keeps the older behaviour - the label is as long as its
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content needs and fills the tape width - for anyone who wants it.
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Created by: Jess Rogerson (yelling commands at Claude.AI)
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"""
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import io
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import logging
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import os
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from dataclasses import dataclass, field
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from typing import List, Optional
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from PIL import Image, ImageDraw, ImageFont
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logger = logging.getLogger(__name__)
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DPI = 313
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MAX_LENGTH_MM = 430.0
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MIN_LENGTH_MM = 12.0
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def mm_to_px(mm, dpi=DPI):
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return max(1, int(round(mm / 25.4 * dpi)))
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def px_to_mm(px, dpi=DPI):
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return px / dpi * 25.4
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@dataclass
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class TapePreset:
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key: str
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name: str
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tape_mm: float
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printable_mm: float
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note: str = ''
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@property
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def printable_px(self):
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return mm_to_px(self.printable_mm)
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# Brother CZ tape widths. printable_mm leaves a hair of margin so a slightly
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# misaligned cassette doesn't clip the text; raise it toward tape_mm from
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# the settings page if you want true edge to edge.
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TAPE_PRESETS = {
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p.key: p for p in [
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TapePreset('cz9', 'CZ tape 9mm', 9.0, 8.0,
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'Too narrow for the 40mm house label.'),
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TapePreset('cz12', 'CZ tape 12mm', 12.0, 11.0,
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'Too narrow for the 40mm house label.'),
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TapePreset('cz19', 'CZ tape 19mm', 19.0, 17.5,
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'Too narrow for the 40mm house label.'),
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TapePreset('cz25', 'CZ tape 25mm', 25.0, 23.5,
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'Too narrow for the 40mm house label.'),
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TapePreset('cz50', 'CZ tape 50mm', 50.0, 48.0,
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'The one to use. Fits the 40mm label across the tape.'),
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]
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}
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DEFAULT_TAPE = 'cz50'
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# ---------------------------------------------------------- label sizing
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LABEL_WIDTH_MM = 40.0
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ONE_PART_HEIGHT_MM = 15.0
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TWO_PART_HEIGHT_MM = 20.0
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# Three or more part types in one drawer is not a size you asked for, so
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# rather than silently dropping parts the label grows by this much each.
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EXTRA_PART_HEIGHT_MM = 5.0
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SIZE_MODES = [
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('auto', '40 x 15mm, or 40 x 20mm for a shared drawer'),
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('standard', 'Always 40 x 15mm'),
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('double', 'Always 40 x 20mm'),
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('fit', 'Fit the tape width (length follows the content)'),
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]
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DEFAULT_SIZE_MODE = 'auto'
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FIXED_MODES = ('auto', 'standard', 'double')
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# The title may take this share of the row height before Text size is even
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# applied. Generous on purpose: these are read at arm's length in a shed.
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TITLE_MAX_SHARE = 0.55
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def label_height_mm(part_count, size_mode=DEFAULT_SIZE_MODE):
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"""The physical height of a label holding this many part types."""
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if size_mode == 'standard':
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return ONE_PART_HEIGHT_MM
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if size_mode == 'double':
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return TWO_PART_HEIGHT_MM
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if part_count <= 1:
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return ONE_PART_HEIGHT_MM
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if part_count == 2:
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return TWO_PART_HEIGHT_MM
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return TWO_PART_HEIGHT_MM + EXTRA_PART_HEIGHT_MM * (part_count - 2)
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def parse_group_spec(spec, labels):
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"""
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Turn "1,2|3" into [[label1, label2], [label3]].
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This is how the page says "put these parts on one label" explicitly,
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which matters for customs and MOC drawers where the parts have nothing
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in common for auto-grouping to latch onto. Unknown or repeated ids are
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ignored, and anything the spec never mentions keeps a label of its own,
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so a stale spec can never silently drop a part.
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"""
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by_id = {label.id: label for label in labels}
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groups = []
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used = set()
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for chunk in (spec or '').split('|'):
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group = []
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for value in chunk.split(','):
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if not value.strip().isdigit():
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continue
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wanted = int(value)
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if wanted in by_id and wanted not in used:
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group.append(by_id[wanted])
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used.add(wanted)
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if group:
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groups.append(group)
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for label in labels:
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if label.id not in used:
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groups.append([label])
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return groups
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def spec_from_groups(groups):
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"""The inverse: [[l1,l2],[l3]] -> '1,2|3'."""
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return '|'.join(','.join(str(l.id) for l in group) for group in groups)
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def group_by_drawer(labels, enabled=True):
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"""
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One physical label per drawer.
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Labels sharing a location are the same drawer, so they go on one taller
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label. A label with no location can't be grouped - it gets its own.
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Order is preserved: a group sits where its first member was.
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"""
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if not enabled:
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return [[label] for label in labels]
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groups = []
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by_location = {}
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for label in labels:
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key = (label.location or '').strip().lower()
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if not key:
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groups.append([label])
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continue
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if key in by_location:
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by_location[key].append(label)
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else:
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group = [label]
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by_location[key] = group
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groups.append(group)
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return groups
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# ------------------------------------------------------------------ fonts
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FONT_CANDIDATES = {
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False: [ # regular
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'C:\\Windows\\Fonts\\segoeui.ttf',
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'C:\\Windows\\Fonts\\arial.ttf',
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'/usr/share/fonts/truetype/dejavu/DejaVuSans.ttf',
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'/usr/share/fonts/truetype/liberation/LiberationSans-Regular.ttf',
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'/Library/Fonts/Arial.ttf',
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],
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True: [ # bold
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'C:\\Windows\\Fonts\\segoeuib.ttf',
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'C:\\Windows\\Fonts\\arialbd.ttf',
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'/usr/share/fonts/truetype/dejavu/DejaVuSans-Bold.ttf',
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'/usr/share/fonts/truetype/liberation/LiberationSans-Bold.ttf',
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'/Library/Fonts/Arial Bold.ttf',
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],
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}
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_font_cache = {}
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def load_font(size_px, bold=False):
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"""Best available sans font at this pixel size. Never raises."""
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key = (int(size_px), bool(bold))
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if key in _font_cache:
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return _font_cache[key]
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for path in FONT_CANDIDATES[bool(bold)]:
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if os.path.exists(path):
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try:
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font = ImageFont.truetype(path, int(size_px))
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_font_cache[key] = font
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return font
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except Exception:
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continue
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# Pillow's built-in bitmap font: ugly at 313dpi but never fails.
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font = ImageFont.load_default()
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_font_cache[key] = font
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return font
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# ---------------------------------------------------------------- options
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DEFAULT_TAPE_FIELDS = ['image', 'name', 'dimensions', 'part_number', 'accent']
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# Hidden marker every options form submits. Its presence is how we tell
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# "submitted with the box unticked" from "arrived here with no options at
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# all" - an unticked checkbox sends nothing, so without this they look
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# identical and a default-on box can never be turned off.
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FORM_MARKER = '_opts'
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@dataclass
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class TapeOptions:
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tape: str = DEFAULT_TAPE
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size_mode: str = DEFAULT_SIZE_MODE
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# Combine labels that share a drawer onto one taller label.
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group_drawers: bool = True
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fields: List[str] = field(
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default_factory=lambda: list(DEFAULT_TAPE_FIELDS))
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# Fixed sizes always lie across the tape - that is the point of them.
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# This only applies to 'fit' mode.
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rotate: bool = True
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copies: int = 1
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# 'fit' mode only: a fixed length in mm instead of sizing to content.
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fixed_length_mm: Optional[float] = None
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padding_mm: float = 1.5
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font_scale: float = 1.0
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image_percent: int = 30
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align: str = 'left' # left | center
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outline: bool = False # hairline box, for checking alignment
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@property
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def is_fixed(self):
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return self.size_mode in FIXED_MODES
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def get_tape(key):
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return TAPE_PRESETS.get(key or DEFAULT_TAPE, TAPE_PRESETS[DEFAULT_TAPE])
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def tape_fits_label(tape):
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"""Can the 40mm label lie across this tape?"""
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return get_tape(tape).printable_mm >= LABEL_WIDTH_MM
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def options_from_form(form, rotate_default=True, size_default=None,
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tape_default=None):
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"""
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Build TapeOptions from request.form / request.args.
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An unticked checkbox is simply absent from a form submission - the
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browser sends nothing for it. So "rotate unticked" and "rotate never
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mentioned" arrive here looking exactly the same, and a box that
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defaults to on could never be turned off. FORM_MARKER is a hidden
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field the options form always sends: when it is present we know every
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checkbox was on screen, so absent means the user unticked it.
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The *_default arguments apply only when the form was NOT submitted (a
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fresh arrival), so saved site-wide preferences are honoured there
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without ever overriding an explicit choice on the page.
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"""
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submitted = FORM_MARKER in form
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def number(key, default, cast=float):
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try:
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return cast(form.get(key, default))
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except (TypeError, ValueError):
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return default
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def flag(key, default=False):
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if key in form:
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return str(form.get(key, '')).lower() in ('1', 'true', 'on', 'yes')
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# Submitted without it: the user unticked it. Not submitted: default.
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return False if submitted else default
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fields = list(form.getlist('fields')) if hasattr(form, 'getlist') else []
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if not fields and not submitted:
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fields = list(DEFAULT_TAPE_FIELDS)
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length = (form.get('fixed_length_mm') or '').strip() if hasattr(form, 'get') else ''
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try:
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fixed = float(length) if length else None
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except ValueError:
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fixed = None
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valid_modes = {key for key, _ in SIZE_MODES}
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size_mode = form.get('size_mode') or size_default or DEFAULT_SIZE_MODE
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if size_mode not in valid_modes:
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size_mode = DEFAULT_SIZE_MODE
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return TapeOptions(
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tape=form.get('tape') or tape_default or DEFAULT_TAPE,
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size_mode=size_mode,
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group_drawers=flag('group_drawers', True),
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fields=fields,
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rotate=flag('rotate', rotate_default),
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copies=max(1, min(99, number('copies', 1, int))),
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fixed_length_mm=fixed,
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padding_mm=max(0.0, min(10.0, number('padding_mm', 1.5))),
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font_scale=max(0.5, min(3.0, number('font_scale', 1.0))),
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image_percent=max(0, min(60, number('image_percent', 30, int))),
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align=form.get('align') or 'left',
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outline=flag('outline', False),
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)
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# ------------------------------------------------------------ text pieces
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def _label_lines(label, fields):
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"""The text that goes on the tape, as (text, weight) pairs."""
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lines = []
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if 'name' in fields:
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title = (label.display_title if 'dimensions' in fields
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else label.name)
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if title:
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lines.append((title, 'title'))
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elif 'dimensions' in fields and label.dimensions:
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lines.append((label.dimensions, 'title'))
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if 'colour' in fields and label.colour_name:
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lines.append((label.colour_name, 'sub'))
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if 'category' in fields and label.category:
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lines.append((label.category.full_name, 'sub'))
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meta = []
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if 'part_number' in fields and label.part_number:
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meta.append(label.part_number)
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if 'alt_numbers' in fields and label.alt_part_numbers:
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meta.append(label.alt_part_numbers)
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if 'category_code' in fields and label.category and label.category.display_code:
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meta.append(label.category.display_code)
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if meta:
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lines.append((' \u00b7 '.join(meta), 'meta'))
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if 'location' in fields and label.location:
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lines.append((label.location, 'meta'))
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return lines
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def _text_width(draw, text, font):
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try:
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box = draw.textbbox((0, 0), text, font=font)
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return box[2] - box[0]
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except Exception:
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return draw.textlength(text, font=font)
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def _fit_text(draw, text, font, available):
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"""Trim with an ellipsis until it fits."""
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shown = text
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while _text_width(draw, shown, font) > available and len(shown) > 2:
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shown = shown[:-2]
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if shown != text and len(shown) > 1:
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shown = shown[:-1] + '\u2026'
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return shown
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def wrap_text(draw, text, font, available):
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"""Greedy word wrap. A word longer than the line gets its own line."""
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words = (text or '').split()
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if not words:
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return []
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lines = [words[0]]
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for word in words[1:]:
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trial = lines[-1] + ' ' + word
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if _text_width(draw, trial, font) <= available:
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lines[-1] = trial
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else:
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lines.append(word)
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return lines
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def _title_size_for(draw, text, available, inner_h, padding, options):
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"""What size the title would come out at in this much room."""
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if not text or available <= 0:
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return 0
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_font, _lines, _h, size = layout_title(
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draw, text, available, inner_h - 2 * padding,
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inner_h * TITLE_MAX_SHARE * options.font_scale,
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inner_h * 0.13, bold=True)
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return size
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def layout_title(draw, text, available, max_h, max_px, min_px,
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bold=True, max_lines=2):
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"""
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Largest type at which the title fits the box, wrapping if that helps.
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"Plate, Modified with Clip" will not fit one line of a 40mm label at a
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readable size, but it fits two comfortably. Prefer wrapping over
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shrinking, and shrinking over truncating - the whole name is the point
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of the label.
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"""
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size = int(max_px)
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floor = max(6, int(min_px))
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best = None
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while size >= floor:
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font = load_font(size, bold=bold)
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lines = wrap_text(draw, text, font, available)
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if lines and len(lines) <= max_lines:
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widest = max(_text_width(draw, line, font) for line in lines)
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height = len(lines) * size * 1.12
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if widest <= available and height <= max_h:
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return font, lines, height, size
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if best is None:
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best = (font, lines, height, size)
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size -= 1
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font = load_font(floor, bold=bold)
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return font, [text], floor * 1.12, floor
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def fit_font(draw, text, available, max_px, min_px, bold=False):
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"""
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The largest font size at which `text` still fits in `available`.
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A 40mm label has very little room once the artwork is on it, and part
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names vary from "Tile" to "Plate, Modified with Clip". Shrinking the
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type keeps the whole name readable; truncating it to "Plate, Mod..."
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does not. Below min_px it stops shrinking and the caller ellipsises.
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"""
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size = int(max_px)
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floor = max(6, int(min_px))
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while size > floor:
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font = load_font(size, bold=bold)
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if _text_width(draw, text, font) <= available:
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return font, size
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size -= 1
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return load_font(floor, bold=bold), floor
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def _load_art(label, upload_folder, box_px):
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if not label.image:
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return None
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path = os.path.join(upload_folder, label.image.replace('/', os.sep))
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if not os.path.exists(path):
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return None
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try:
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art = Image.open(path).convert('RGBA')
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art.thumbnail((box_px, box_px), Image.LANCZOS)
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return art
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except Exception as exc:
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logger.warning('Could not load part image %s: %s', path, exc)
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return None
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# -------------------------------------------------------- fixed-size draw
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def render_fixed(labels, options, upload_folder):
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"""
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One drawer label at the house size, drawn flat and reading normally:
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40mm wide, 15mm tall for one part, 20mm for two, taller beyond that.
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`labels` is every part type in that drawer - one row each.
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"""
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# Whatever is handed in gets drawn. Deciding how many parts belong on
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# one label is plan_groups' job - doing it here too once meant a part
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# was quietly dropped instead of getting a label of its own.
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labels = list(labels) or []
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rows = max(1, len(labels))
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|
|
|
width_px = mm_to_px(LABEL_WIDTH_MM)
|
|
height_mm = label_height_mm(len(labels), options.size_mode)
|
|
height_px = mm_to_px(height_mm)
|
|
|
|
canvas = Image.new('RGB', (width_px, height_px), 'white')
|
|
draw = ImageDraw.Draw(canvas)
|
|
|
|
if options.outline:
|
|
draw.rectangle([0, 0, width_px - 1, height_px - 1],
|
|
outline=(190, 190, 190), width=max(1, mm_to_px(0.2)))
|
|
|
|
fields = set(options.fields)
|
|
# Deliberately tighter than the fit-tape padding: 1.5mm top and bottom
|
|
# would eat a third of a two-part label's 10mm row.
|
|
padding = mm_to_px(min(options.padding_mm, 0.8))
|
|
row_h = height_px / rows
|
|
|
|
for index, label in enumerate(labels):
|
|
top = int(index * row_h)
|
|
bottom = int((index + 1) * row_h)
|
|
inner_h = bottom - top
|
|
|
|
# A hairline between parts so the two halves read as separate.
|
|
if index:
|
|
draw.line([(padding, top), (width_px - padding, top)],
|
|
fill=(205, 205, 205), width=max(1, mm_to_px(0.15)))
|
|
|
|
cursor_x = padding
|
|
if 'accent' in fields and label.category:
|
|
accent_w = mm_to_px(1.2)
|
|
colour = label.category.accent_colour()
|
|
try:
|
|
rgb = tuple(int(colour.lstrip('#')[i:i + 2], 16)
|
|
for i in (0, 2, 4))
|
|
except Exception:
|
|
rgb = (209, 16, 19)
|
|
draw.rectangle([cursor_x, top + padding,
|
|
cursor_x + accent_w, bottom - padding], fill=rgb)
|
|
cursor_x += accent_w + padding
|
|
|
|
lines = _label_lines(label, fields)
|
|
title = next((t for t, w in lines if w == 'title'), None)
|
|
rest = [t for t, w in lines if w != 'title']
|
|
meta_text = ' \u00b7 '.join(rest) if rest else None
|
|
|
|
# Text beats artwork. The picture is a hint; the name is the label.
|
|
# Try the full-size image first and give room back to the type until
|
|
# the title reaches the size the Text size setting asked for - that
|
|
# is what makes turning Text size up actually do something on a
|
|
# label this small.
|
|
text_left = cursor_x
|
|
art = None
|
|
wanted_px = inner_h * 0.34 * options.font_scale
|
|
base_box = min(inner_h - 2 * padding,
|
|
int(width_px * options.image_percent / 100.0))
|
|
|
|
if 'image' in fields and options.image_percent and label.image:
|
|
for share in (1.0, 0.75, 0.5, 0.0):
|
|
candidate = _load_art(label, upload_folder,
|
|
int(base_box * share)) if share else None
|
|
used = (candidate.width + padding) if candidate else 0
|
|
room = width_px - cursor_x - used - padding
|
|
probe_size = _title_size_for(draw, title, room, inner_h,
|
|
padding, options) if title else 0
|
|
art = candidate
|
|
text_left = cursor_x + used
|
|
if not title or probe_size >= wanted_px or share == 0.0:
|
|
break
|
|
|
|
if art is not None:
|
|
canvas.paste(art, (cursor_x, top + (inner_h - art.height) // 2),
|
|
art)
|
|
cursor_x = text_left
|
|
|
|
available = width_px - cursor_x - padding
|
|
|
|
# The name comes first and takes what it needs; the meta line gets
|
|
# the leftover. Sizing the meta line first (and letting Text size
|
|
# inflate it) pushed the part number off the bottom of the label and
|
|
# squeezed the name smaller the higher you turned the setting.
|
|
room = inner_h - 2 * padding
|
|
reserve = min(room * 0.30, inner_h * 0.26) if meta_text else 0
|
|
|
|
title_font = title_lines = None
|
|
title_h = 0
|
|
title_px = 0
|
|
if title:
|
|
# The floor stays put as Text size rises: the setting lifts the
|
|
# ceiling, and the fitter takes the largest size the whole name
|
|
# fits at. Raising the floor too meant a long name could not
|
|
# shrink far enough to wrap and got truncated instead.
|
|
title_font, title_lines, title_h, title_px = layout_title(
|
|
draw, title, available, room - reserve,
|
|
inner_h * TITLE_MAX_SHARE * options.font_scale,
|
|
inner_h * 0.13, bold=True)
|
|
|
|
meta_font = meta_px = None
|
|
meta_h = 0
|
|
leftover = room - title_h
|
|
if meta_text and leftover > mm_to_px(1.2):
|
|
meta_font, meta_px = fit_font(
|
|
draw, meta_text, available,
|
|
min(inner_h * 0.26 * options.font_scale, leftover / 1.15),
|
|
min(inner_h * 0.15, leftover / 1.15), bold=False)
|
|
meta_h = meta_px * 1.15
|
|
|
|
block_h = title_h + meta_h
|
|
y = top + max(padding, (inner_h - block_h) / 2)
|
|
|
|
if title_lines:
|
|
for line in title_lines:
|
|
shown = _fit_text(draw, line, title_font, available)
|
|
x = cursor_x
|
|
if options.align == 'center':
|
|
x += max(0, (available - _text_width(draw, shown, title_font)) / 2)
|
|
draw.text((x, y), shown, font=title_font, fill=(0, 0, 0))
|
|
y += title_px * 1.12
|
|
|
|
if meta_text:
|
|
shown = _fit_text(draw, meta_text, meta_font, available)
|
|
x = cursor_x
|
|
if options.align == 'center':
|
|
x += max(0, (available - _text_width(draw, shown, meta_font)) / 2)
|
|
draw.text((x, y), shown, font=meta_font, fill=(70, 70, 70))
|
|
|
|
return canvas
|
|
|
|
|
|
# ------------------------------------------------------- fit-tape drawing
|
|
|
|
def render_fit(label, options, upload_folder):
|
|
"""
|
|
The older behaviour: the label fills the tape width and runs as long as
|
|
its content needs. Drawn flat, reading left to right.
|
|
"""
|
|
tape = get_tape(options.tape)
|
|
height = tape.printable_px
|
|
padding = mm_to_px(options.padding_mm)
|
|
|
|
fields = set(options.fields)
|
|
lines = _label_lines(label, fields)
|
|
|
|
base = height * 0.34 * options.font_scale
|
|
if len(lines) > 2:
|
|
base *= 0.78
|
|
sizes = {
|
|
'title': max(8, int(base)),
|
|
'sub': max(7, int(base * 0.72)),
|
|
'meta': max(6, int(base * 0.62)),
|
|
}
|
|
fonts = {
|
|
'title': load_font(sizes['title'], bold=True),
|
|
'sub': load_font(sizes['sub'], bold=False),
|
|
'meta': load_font(sizes['meta'], bold=False),
|
|
}
|
|
|
|
art = None
|
|
art_width = 0
|
|
if 'image' in fields and options.image_percent:
|
|
art = _load_art(label, upload_folder, height - 2 * padding)
|
|
if art is not None:
|
|
art_width = art.width + padding
|
|
|
|
accent_width = mm_to_px(1.2) if ('accent' in fields and label.category) else 0
|
|
|
|
probe = ImageDraw.Draw(Image.new('RGB', (10, 10)))
|
|
text_width = 0
|
|
for text, weight in lines:
|
|
text_width = max(text_width, _text_width(probe, text, fonts[weight]))
|
|
|
|
natural = accent_width + padding + art_width + text_width + 2 * padding
|
|
if options.fixed_length_mm:
|
|
width = mm_to_px(min(MAX_LENGTH_MM, max(MIN_LENGTH_MM,
|
|
options.fixed_length_mm)))
|
|
else:
|
|
width = max(mm_to_px(MIN_LENGTH_MM),
|
|
min(mm_to_px(MAX_LENGTH_MM), int(natural)))
|
|
|
|
canvas = Image.new('RGB', (width, height), 'white')
|
|
draw = ImageDraw.Draw(canvas)
|
|
|
|
if options.outline:
|
|
draw.rectangle([0, 0, width - 1, height - 1], outline=(190, 190, 190),
|
|
width=max(1, mm_to_px(0.2)))
|
|
|
|
cursor_x = 0
|
|
if accent_width:
|
|
colour = label.category.accent_colour()
|
|
try:
|
|
rgb = tuple(int(colour.lstrip('#')[i:i + 2], 16) for i in (0, 2, 4))
|
|
except Exception:
|
|
rgb = (209, 16, 19)
|
|
draw.rectangle([0, 0, accent_width, height], fill=rgb)
|
|
cursor_x = accent_width + padding
|
|
|
|
if art is not None:
|
|
canvas.paste(art, (cursor_x, (height - art.height) // 2), art)
|
|
cursor_x += art.width + padding
|
|
|
|
total_text = sum(sizes[w] * 1.22 for _, w in lines)
|
|
y = max(padding, (height - total_text) / 2)
|
|
available = width - cursor_x - padding
|
|
|
|
for text, weight in lines:
|
|
font = fonts[weight]
|
|
shown = _fit_text(draw, text, font, available)
|
|
x = cursor_x
|
|
if options.align == 'center':
|
|
x = cursor_x + max(0, (available - _text_width(draw, shown, font)) / 2)
|
|
draw.text((x, y), shown, font=font, fill=(0, 0, 0))
|
|
y += sizes[weight] * 1.22
|
|
|
|
return canvas
|
|
|
|
|
|
# --------------------------------------------------------- tape composing
|
|
|
|
def compose_for_tape(flat, options):
|
|
"""
|
|
Place a flat label onto the tape raster.
|
|
|
|
Convention: the returned image's WIDTH is the across-tape dimension and
|
|
its HEIGHT is how much tape length the label consumes.
|
|
|
|
Fixed sizes always lie across the tape - the 40mm spans the tape width,
|
|
which is the whole point of them - so the flat image goes on as-is,
|
|
centred, and each label only costs 15mm of tape. In 'fit' mode the
|
|
rotate option still chooses between reading along the tape or across it.
|
|
|
|
The raster is the full printable tape width even though the label is
|
|
40mm: AirPrint scales a job to the media width, so sending a 40mm-wide
|
|
image would be stretched to 48 and print oversize. Full width at 1:1
|
|
keeps the printed label exactly 40mm.
|
|
"""
|
|
tape = get_tape(options.tape)
|
|
tape_px = tape.printable_px
|
|
|
|
if options.is_fixed:
|
|
placed = flat
|
|
# Too narrow a tape would clip the label; scale to fit and let the
|
|
# caller warn, rather than printing something cut off.
|
|
if placed.width > tape_px:
|
|
ratio = tape_px / placed.width
|
|
placed = placed.resize(
|
|
(tape_px, max(1, int(placed.height * ratio))), Image.LANCZOS)
|
|
canvas = Image.new('RGB', (tape_px, placed.height), 'white')
|
|
canvas.paste(placed, ((tape_px - placed.width) // 2, 0))
|
|
return canvas
|
|
|
|
# 'fit' mode: rotate so the label reads along the tape as it feeds.
|
|
return flat.rotate(90, expand=True) if options.rotate else flat
|
|
|
|
|
|
def render_group(labels, options, upload_folder):
|
|
"""A finished tape raster for one drawer (one or more part types)."""
|
|
labels = list(labels)
|
|
if options.is_fixed:
|
|
flat = render_fixed(labels, options, upload_folder)
|
|
else:
|
|
flat = render_fit(labels[0], options, upload_folder)
|
|
return compose_for_tape(flat, options)
|
|
|
|
|
|
def render_label(label, options, upload_folder):
|
|
"""Single-label convenience wrapper (previews, one-off prints)."""
|
|
group = label if isinstance(label, (list, tuple)) else [label]
|
|
return render_group(group, options, upload_folder)
|
|
|
|
|
|
def plan_groups(labels, options, group_spec=None):
|
|
"""
|
|
How the selection turns into physical labels.
|
|
|
|
Returns a list of dicts: the parts on each label, its size in mm, and
|
|
whether it will fit the loaded tape.
|
|
|
|
An explicit group_spec from the page wins over auto-grouping - that is
|
|
how you combine parts by hand for a custom drawer.
|
|
"""
|
|
tape = get_tape(options.tape)
|
|
if group_spec:
|
|
groups = parse_group_spec(group_spec, labels)
|
|
else:
|
|
groups = group_by_drawer(
|
|
labels, enabled=options.group_drawers and options.is_fixed)
|
|
|
|
# How many part types one label may carry. 'standard' is a one-part
|
|
# label, so a drawer with two parts gets two labels rather than losing
|
|
# one; 'double' spills a third part onto a second label.
|
|
per_label = {'standard': 1, 'double': 2}.get(options.size_mode)
|
|
|
|
# Groups the user built by hand are never broken up: asking for these
|
|
# parts together outranks the size setting, so the label grows instead.
|
|
explicit = bool(group_spec)
|
|
|
|
plan = []
|
|
for group in groups:
|
|
chunks = [group]
|
|
if options.is_fixed and per_label and not explicit:
|
|
chunks = [group[i:i + per_label]
|
|
for i in range(0, len(group), per_label)] or [[]]
|
|
|
|
for chunk in chunks:
|
|
if not chunk:
|
|
continue
|
|
if options.is_fixed:
|
|
width_mm = LABEL_WIDTH_MM
|
|
mode = options.size_mode
|
|
if explicit and per_label and len(chunk) > per_label:
|
|
mode = 'auto'
|
|
height_mm = label_height_mm(len(chunk), mode)
|
|
fits = tape.printable_mm >= width_mm
|
|
else:
|
|
width_mm = height_mm = None
|
|
fits = True
|
|
plan.append({
|
|
'labels': chunk,
|
|
'width_mm': width_mm,
|
|
'height_mm': height_mm,
|
|
'fits': fits,
|
|
'drawer': (chunk[0].location or '').strip(),
|
|
})
|
|
return plan
|
|
|
|
|
|
def tape_used_mm(plan, copies=1):
|
|
"""Total tape length a print run will consume, in mm."""
|
|
total = 0.0
|
|
for item in plan:
|
|
total += (item['height_mm'] or 0) * copies
|
|
return total
|
|
|
|
|
|
# --------------------------------------------------------------- outputs
|
|
|
|
def image_to_bytes(image, mime_type):
|
|
"""Serialise a rendered label in whatever format the printer accepts."""
|
|
buffer = io.BytesIO()
|
|
if mime_type == 'image/jpeg':
|
|
image.convert('RGB').save(buffer, 'JPEG', quality=95, dpi=(DPI, DPI))
|
|
elif mime_type == 'image/png':
|
|
image.save(buffer, 'PNG', dpi=(DPI, DPI))
|
|
elif mime_type == 'application/pdf':
|
|
image.convert('RGB').save(buffer, 'PDF', resolution=DPI)
|
|
else:
|
|
raise ValueError(f'Cannot produce {mime_type}')
|
|
buffer.seek(0)
|
|
return buffer.getvalue()
|
|
|
|
|
|
def render_batch_pdf(labels, options, upload_folder, group_spec=None):
|
|
"""Every label as one multi-page PDF, one tape label per page."""
|
|
plan = plan_groups(labels, options, group_spec)
|
|
images = []
|
|
for item in plan:
|
|
for _ in range(options.copies):
|
|
images.append(render_group(item['labels'], options, upload_folder)
|
|
.convert('RGB'))
|
|
if not images:
|
|
return None
|
|
buffer = io.BytesIO()
|
|
images[0].save(buffer, 'PDF', resolution=DPI, save_all=True,
|
|
append_images=images[1:])
|
|
buffer.seek(0)
|
|
return buffer
|
|
|
|
|
|
def preview_png(labels, options, upload_folder, scale=11.0):
|
|
"""
|
|
A screen preview of one physical label, shown flat so it is readable.
|
|
|
|
Scale is px per mm on screen, so a 40 x 15mm label previews at roughly
|
|
440 x 165 - close enough to actual size on a typical monitor to judge.
|
|
"""
|
|
group = labels if isinstance(labels, (list, tuple)) else [labels]
|
|
|
|
if options.is_fixed:
|
|
flat = render_fixed(group, options, upload_folder)
|
|
else:
|
|
saved = options.rotate
|
|
options.rotate = False
|
|
try:
|
|
flat = render_fit(group[0], options, upload_folder)
|
|
finally:
|
|
options.rotate = saved
|
|
|
|
target_w = max(1, int(px_to_mm(flat.width) * scale))
|
|
target_h = max(1, int(px_to_mm(flat.height) * scale))
|
|
preview = flat.resize((target_w, target_h), Image.LANCZOS)
|
|
|
|
buffer = io.BytesIO()
|
|
preview.save(buffer, 'PNG')
|
|
buffer.seek(0)
|
|
return buffer
|