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Label creation and print

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This commit is contained in:
Dirk Jahnke
2022-04-01 10:19:41 +02:00
parent 734598a379
commit 8b48741816
3 changed files with 138 additions and 30 deletions
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57
labelprinter/labels.py
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@@ -6,8 +6,11 @@ from io import BytesIO
import datetime
import textwrap
from math import floor
import PIL.Image
import barcode as python_barcode
from PIL import Image, ImageDraw, ImageFont
import labelprinter
def now(fmt="%Y-%m-%d %H:%M"):
@@ -43,7 +46,8 @@ def wrap(text, col_width):
return "\n".join(textwrap.wrap(text, col_width))
def container_label(data, barcode_class='code128', fmt='png', logo_file='./static/images/djlogo256.png',owner_name='Dirk Jahnke', description='', **writer_options):
def container_label(data, barcode_class='code128', fmt='png', logo_file='./static/images/djlogo256.png',
owner_name='Dirk Jahnke', description='', description_line2='', **options):
"""Return a barcode's image data.
Powered by the Python library ``python-barcode``. See this library's
documentation for more details.
@@ -60,6 +64,10 @@ def container_label(data, barcode_class='code128', fmt='png', logo_file='./stati
svg -> embeddable code for html img tag
logo_file
File path to logo file to be included
owner_name
Name of owner printed underneath the logo
description
Text to be printed on bottom of the label
writer_options
Various options for the writer to tune the appearance of the barcode
(see python-barcode documentation).
@@ -86,8 +94,10 @@ def container_label(data, barcode_class='code128', fmt='png', logo_file='./stati
"""
with Image.open(logo_file) as logo_img:
font_size = 16
logo_img = logo_img.resize((128,128))
font_size = 22
font_size_small = 16
owner_name_font_size = 26
logo_img = logo_img.resize((128, 128))
logo_img = logo_img.convert('L')
threshold = 20
logo_img = logo_img.point(lambda p: 255 if p < threshold else 0)
@@ -96,26 +106,47 @@ def container_label(data, barcode_class='code128', fmt='png', logo_file='./stati
data = str(data).zfill(constructor.digits)
writer = {
'svg': python_barcode.writer.ImageWriter,
'png': python_barcode.writer.ImageWriter
'png': python_barcode.writer.ImageWriter,
'image': python_barcode.writer.ImageWriter
}[fmt]
barcode_img = constructor(data, writer=writer())
img = barcode_img.render(writer_options=writer_options)
img = barcode_img.render(writer_options=options['writer_options'])
barcode_xsize, barcode_ysize = img.size
logo_xsize, logo_ysize = logo_img.size
result_img = Image.new('1', (696, barcode_ysize+20), 1)
result_img.paste(logo_img, (0, floor(barcode_ysize/3)-floor(logo_ysize/2)))
label_xsize = 696
label_ysize = barcode_ysize + font_size if description_line2 == '' else barcode_ysize + 2 * font_size
result_img = Image.new('1', (label_xsize, label_ysize), 1)
result_img.paste(logo_img, (owner_name_font_size + 10, floor(barcode_ysize / 2) - 20 - floor(logo_ysize / 2)))
start_x_for_barcode = logo_xsize + 10
max_x_for_barcode = 696 - start_x_for_barcode
result_img.paste(img, (start_x_for_barcode + floor((max_x_for_barcode-barcode_xsize)/2), 5))
# fnt = ImageFont.truetype("Pillow/Tests/fonts/FreeMono.ttf", 40)
result_img.paste(img, (start_x_for_barcode + floor((max_x_for_barcode - barcode_xsize) / 2), 5))
fnt = ImageFont.truetype("./static/fonts/DejaVuSerif.ttf", font_size)
d = ImageDraw.Draw(result_img)
d.text((20,logo_ysize+40), owner_name, font=fnt)
d.text((30+floor((660-fnt.getlength(description))/2),barcode_ysize), description, font=fnt)
owner_name_fnt = ImageFont.truetype("./static/fonts/DejaVuSerif.ttf", owner_name_font_size)
owner_text_img = Image.new('1', (floor(owner_name_fnt.getlength(owner_name)+1), owner_name_font_size+5), 1)
d = ImageDraw.Draw(owner_text_img)
d.text((0,0), owner_name, font=owner_name_fnt)
owner_text_img = owner_text_img.transpose(PIL.Image.ROTATE_90)
result_img.paste(owner_text_img, (0, 10))
if fmt == 'png':
d = ImageDraw.Draw(result_img)
#d.text((20, logo_ysize), owner_name, font=fnt)
if fnt.getlength(description) > 660:
fnt_small = ImageFont.truetype("./static/fonts/DejaVuSerif.ttf", font_size_small)
d.text((0, barcode_ysize), description, font=fnt_small)
if description_line2 != '':
d.text((0, barcode_ysize + font_size), description_line2, font=fnt_small)
else:
#d.text((30 + floor((660 - fnt.getlength(description)) / 2), barcode_ysize), description, font=fnt)
d.text((0, barcode_ysize), description, font=fnt)
if description_line2 != '':
d.text((0, barcode_ysize + font_size), description_line2, font=fnt)
if fmt == 'image':
return result_img
elif fmt == 'png':
return pil_to_html_imgdata(result_img, fmt='PNG')
else:
prefix = "data:image/svg+xml;charset=utf-8;base64,"
return prefix + base64.b64encode(result_img).decode()