Create label image for container
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@ -20,7 +20,7 @@
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<div class="row">
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<div class="col-sm-12">
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<a class="btn btn-primary" href="{% url 'container:edit' container.id %}" role="button">Edit</a>
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<a class="btn btn-primary" href="{% url 'container:update' container.id %}" role="button">Edit</a>
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<a class="btn btn-primary" href="{% url 'container:delete' container.id %}" role="button">Delete</a>
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</div>
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@ -29,7 +29,11 @@
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<td><div>{{ container.color }}</div></td>
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<td><div>{{ container.description }}</div></td>
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<td><div>{{ container.changed_ts | date:'H:i:s d.m.Y' }}</div></td>
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<td><a class="btn btn-outline-primary btn-sm" href="{% url 'container:delete' container.id %}" role="button">Delete</a></td>
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<td>
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<a class="btn btn-outline-primary btn-sm" href="{% url 'container:delete' container.id %}" role="button">Delete</a>
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<a class="btn btn-outline-primary btn-sm" href="{% url 'container:detail' container.id %}" role="button">View</a>
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<a class="btn btn-outline-primary btn-sm" href="{% url 'container:print_label' container.id %}" role="button">Label</a>
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</td>
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</tr>
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{% endfor %}
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</tbody>
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@ -0,0 +1,22 @@
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{% extends "base.html" %}
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{% load static %}
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{% block title %}Container: {{ container.named_id }}{% endblock %}
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{% block content %}
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===== Print Label Content =====
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<!-- Action buttons -->
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<div class="row">
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<div class="col-sm-12">
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Label created for container {{ container.named_id }} of type {{ container.container_type.named_id }}
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<br />
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<img class="img-fluid shadow p-3 mb-5 bg-body rounded" src="{{ barcode_img }}">
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</div>
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</div>
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<!-- End Action buttons -->
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</div>
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{% endblock content %}
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@ -1,13 +1,15 @@
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from django.urls import path
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from container.views import ContainerListView, ContainerUpdateView, ContainerCreateView, ContainerDetailView, ContainerDeleteView
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from container.views import ContainerListView, ContainerUpdateView, ContainerCreateView, ContainerDetailView, ContainerDeleteView, ContainerPrintLabelView
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from container.views import ContainerTypeListView, ContainerTypeDetailView, ContainerTypeCreateView, ContainerTypeUpdateView, ContainerTypeDeleteView
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app_name = 'container'
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urlpatterns = [
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path('', ContainerListView.as_view(), name='list'),
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path('<int:pk>/', ContainerDetailView.as_view(), name='detail'),
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path('add/', ContainerCreateView.as_view(), name='add'),
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path('edit/<int:pk>/', ContainerUpdateView.as_view(), name='update'),
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path('label/<int:pk>/', ContainerPrintLabelView.as_view(), name='print_label'),
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path('delete/<int:pk>/', ContainerDeleteView.as_view(), name='delete'),
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path('type/', ContainerTypeListView.as_view(), name='container_type_list'),
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path('type/<int:pk>/', ContainerTypeDetailView.as_view(), name='container_type_detail'),
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@ -1,6 +1,7 @@
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from django.views import generic
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from .models import Container, ContainerType
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from blabel import LabelWriter
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from labelprinter.labels import container_label
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class ContainerListView(generic.ListView):
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model = Container
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@ -48,13 +49,36 @@ class ContainerPrintLabelView(generic.DetailView):
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model = Container
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template_name = 'container/container_print_label.html'
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def get(self, **kwargs):
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super().get(kwargs)
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def get(self, request, **kwargs):
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context = super().get(request, **kwargs)
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'''
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label_writer = LabelWriter(
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'templates/label/container_label.html',
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default_stylesheets=("templates/label/label_style.css",)
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"container/templates/label/container_label.html",
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default_stylesheets=("container/templates/label/label_style.css",)
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)
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label_writer.write_labels(kwargs['pk'], target="container_label.pdf")
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label_writer.write_labels([dict(named_id=kwargs['pk'], id=kwargs['pk'])], target="container_label.pdf")
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'''
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return context
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def get_context_data(self, **kwargs):
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context = super().get_context_data(**kwargs)
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from labelprinter.labels import container_label
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container_description = self.object.container_type.named_id
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if len(self.object.container_type.description) > 0:
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container_description += ': ' + self.object.container_type.description
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if len(self.object.description) > 0:
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container_description += ' / ' + self.object.description
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context['barcode_img'] = container_label(self.object.named_id, description=container_description, writer_options={'background': 'white',
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'font_size': 10,
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'foreground': 'black',
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'module_height': 10.0,
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'module_width': 0.2,
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'quiet_zone': 2.5,
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'text': 'This is the text',
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'text_distance': 3.0,
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'write_text': True
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})
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return context
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class ContainerTypeListView(generic.ListView):
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@ -101,4 +125,3 @@ class ContainerTypeUpdateView(generic.UpdateView):
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class ContainerTypeDeleteView(generic.DetailView):
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model = ContainerType
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@ -0,0 +1,121 @@
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"""Utilities for label generation.
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stolen from: https://github.com/Edinburgh-Genome-Foundry/blabel
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"""
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import base64
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from io import BytesIO
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import datetime
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import textwrap
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from math import floor
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import barcode as python_barcode
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from PIL import Image, ImageDraw, ImageFont
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def now(fmt="%Y-%m-%d %H:%M"):
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"""Display the current time.
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Default format is "year-month-day hour:minute" but another format can be
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provided (see ``datetime`` docs for date formatting).
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"""
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now = datetime.datetime.now()
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if fmt is not None:
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now = now.strftime(fmt)
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return now
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def pil_to_html_imgdata(img, fmt='PNG'):
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"""Convert a PIL image into HTML-displayable data.
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The result is a string ``data:image/FMT;base64,xxxxxxxxx`` which you
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can provide as a "src" parameter to a ``<img/>`` tag.
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Examples:
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---------
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>>> data = pil_to_html_imgdata(my_pil_img)
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>>> html_data = '<img src="%s"/>' % data
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"""
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buffered = BytesIO()
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img.save(buffered, format=fmt)
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img_str = base64.b64encode(buffered.getvalue())
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prefix = 'data:image/%s;charset=utf-8;base64,' % fmt.lower()
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return prefix + img_str.decode()
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def wrap(text, col_width):
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"""Breaks the text into lines with at maximum 'col_width' characters."""
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return "\n".join(textwrap.wrap(text, col_width))
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def container_label(data, barcode_class='code128', fmt='png', logo_file='./static/images/djlogo256.png',owner_name='Dirk Jahnke', description='', **writer_options):
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"""Return a barcode's image data.
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Powered by the Python library ``python-barcode``. See this library's
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documentation for more details.
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Parameters
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----------
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data
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Data to be encoded in the datamatrix.
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barcode_class
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Class/standard to use to encode the data. Different standards have
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different constraints.
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fmt
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The format to be used when rendering the resulting image
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png -> png image
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svg -> embeddable code for html img tag
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logo_file
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File path to logo file to be included
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writer_options
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Various options for the writer to tune the appearance of the barcode
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(see python-barcode documentation).
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Returns
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-------
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image_base64_data
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A string ``data:image/png;base64,xxxxxxxxx`` which you can provide as a
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"src" parameter to a ``<img/>`` tag.
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Examples:
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---------
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>>> data = barcode('EGF12134', barcode_class='code128')
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>>> html_data = '<img src="%s"/>' % data
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Examples of writer options:
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>>> { 'background': 'white',
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>>> 'font_size': 10,
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>>> 'foreground': 'black',
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>>> 'module_height': 15.0,
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>>> 'module_width': 0.2,
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>>> 'quiet_zone': 6.5,
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>>> 'text': '',
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>>> 'text_distance': 5.0,
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>>> 'write_text': True
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>>> }
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"""
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with Image.open(logo_file) as logo_img:
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font_size = 16
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logo_img = logo_img.resize((128,128))
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logo_img = logo_img.convert('L')
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threshold = 20
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logo_img = logo_img.point(lambda p: 255 if p < threshold else 0)
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logo_img = logo_img.convert('1')
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constructor = python_barcode.get_barcode_class(barcode_class)
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data = str(data).zfill(constructor.digits)
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writer = {
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'svg': python_barcode.writer.ImageWriter,
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'png': python_barcode.writer.ImageWriter
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}[fmt]
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barcode_img = constructor(data, writer=writer())
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img = barcode_img.render(writer_options=writer_options)
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barcode_xsize, barcode_ysize = img.size
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logo_xsize, logo_ysize = logo_img.size
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result_img = Image.new('1', (696, barcode_ysize+20), 1)
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result_img.paste(logo_img, (0, floor(barcode_ysize/3)-floor(logo_ysize/2)))
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start_x_for_barcode = logo_xsize + 10
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max_x_for_barcode = 696 - start_x_for_barcode
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result_img.paste(img, (start_x_for_barcode + floor((max_x_for_barcode-barcode_xsize)/2), 5))
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# fnt = ImageFont.truetype("Pillow/Tests/fonts/FreeMono.ttf", 40)
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fnt = ImageFont.truetype("./static/fonts/DejaVuSerif.ttf", font_size)
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d = ImageDraw.Draw(result_img)
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d.text((20,logo_ysize+40), owner_name, font=fnt)
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d.text((30+floor((660-fnt.getlength(description))/2),barcode_ysize), description, font=fnt)
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if fmt == 'png':
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return pil_to_html_imgdata(result_img, fmt='PNG')
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else:
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prefix = "data:image/svg+xml;charset=utf-8;base64,"
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return prefix + base64.b64encode(result_img).decode()
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