brewery-website/config/extras.py

import labels
from django.urls import reverse

from reportlab.graphics import shapes
from reportlab.graphics.barcode import createBarcodeDrawing
from reportlab.graphics.barcode.qr import QrCodeWidget
from reportlab.lib.pagesizes import LETTER
from config.settings import DEBUG

BREWFATHER_APP_ROOT = 'https://web.brewfather.app'

class AveryLabel:
    """
    test_labels = [
        {'manufacturer':'SafAle', 'name':'S-04', 'date':'2024-05-01', 'id':'12345'},
        {'manufacturer':'SafAle', 'name':'US-05', 'date':'2024-05-15', 'id':'23456'}
    ]

    labelSheet = AveryLabel(18294, debug=True)
    labelSheet.render(test_labels, 'filelabels.pdf', 5)
    """
    
    AVERY = {
        18294: ( 4, 15, LETTER, (44.45, 16.764), (7.62, 13.97)),
        5263:  ( 2, 5,  LETTER, (101.6, 50.8),   (3.95, 12.7)),
    }

    def __init__(self, label, **kwargs):
        data = self.AVERY[label]
        self.across = data[0]
        self.down = data[1]
        self.pagesize = data[2]
        self.labelsize = data[3]
        self.margins = data[4]
        self.topDown = True
        self.debug = False
        self.position = 0
        self.previous_used = 0
        self.corner_radius = 2
        self.__dict__.update(kwargs)

        self.specs = labels.Specification(
            self.pagesize[0]*0.352778, self.pagesize[1]*0.352778, # Convert from PostScript points to mm
            self.across, self.down,
            self.labelsize[0], self.labelsize[1],
            corner_radius=self.corner_radius,
            left_margin=self.margins[0], right_margin=self.margins[0], top_margin=self.margins[1],
            left_padding=2, right_padding=1, top_padding=1, bottom_padding=0,
            row_gap=0)

    # def draw_sample(self, label, width, height, obj):
        # if not obj['blank']:
            # obj['path'] = reverse("yeast:sample", kwargs={"sample_id": obj['id']})
            # # Barcode
            # if DEBUG:
                # qrw = QrCodeWidget('https://yeast.giacofei.org/{path}'.format(**obj))
            # else:
                # qrw = QrCodeWidget('https://{host}/{path}'.format(**obj))

            # b = qrw.getBounds()
            # w=b[2]-b[0]
            # h=b[3]-b[1]
            # psSize = (self.labelsize[1]/0.352778)
            # d = shapes.Drawing(w,h, transform=[(4.5/6) * (psSize/w),0,0,(4.5/6) * (psSize/h),0,0]) 
            # d.add(qrw)
            # label.add(d)

            # # Title
            # label.add(shapes.String(
                # 0,                             # Left Position
                # 5 * height / 6,                 # Bottom Position
                # '{manufacturer} {name}'.format(**obj), # Text
                # fontName="Helvetica",
                # fontSize=10
            # ))
            
            # # Line
            # line_pos = 4.5 * height / 6
            # label.add(shapes.Line(0, line_pos, width,line_pos))
            
            # # Metadata
            # label.add(shapes.String(
                # height*.75,                   # Left Position
                # 3 * height / 6,                 # Bottom Position
                # 'ID: {id}'.format(**obj),   # Text
                # fontName="Helvetica",
                # fontSize=6
            # ))
            # label.add(shapes.String(
                # height*.75,                   # Left Position
                # 2 * height / 6,                 # Bottom Position
                # 'Packaging Date: {date}'.format(**obj),   # Text
                # fontName="Helvetica",
                # fontSize=6
            # ))

    def draw(self, label, width, height, obj):
        if not obj['blank']:
            obj['path'] = reverse(
                "{}:{}".format(obj['ns'],obj['template']), 
                kwargs={"{}_id".format(obj['template']): obj['id']}
            )

            # Barcode
            if DEBUG:
                qrw = QrCodeWidget('https://brewery.giacofei.org/{path}'.format(**obj))
            else:
                qrw = QrCodeWidget('https://{host}/{path}'.format(**obj))

            num_lines = max(len(obj['data']) + 1, 6)
            font = height/num_lines

            b = qrw.getBounds()
            w=b[2]-b[0]
            h=b[3]-b[1]
            psSize = (self.labelsize[1]/0.352778)
            d = shapes.Drawing(w,h, transform=[(psSize/w),0,0,(psSize/h),0,0]) 
            d.add(qrw)
            label.add(d)

            # Line
            line_pos = (num_lines - 1) * height / num_lines
            label.add(shapes.Line(height, line_pos, width,line_pos))
            
            # Title
            label.add(shapes.String(
                height,                       # Left Position
                line_pos * 1.05,               # Bottom Position
                '{title}'.format(**obj), # Text
                fontName="Helvetica",
                fontSize=font
            ))

            for x, line in enumerate(obj['data']):
                x=x+1
                label.add(shapes.String(
                    height,                       # Left Position
                    line_pos - font * x,               # Bottom Position
                    line, # Text
                    fontName="Helvetica",
                    fontSize=font
                ))  

    def render(self, objects, render_file, labels_used=0):
        """ 
        
        # Create the HttpResponse object with the appropriate PDF headers.
            response = HttpResponse(mimetype='application/pdf')
            response['Content-Disposition'] = 'attachment; filename=somefilename.pdf'
        """

        # Create the sheet.
        # if render_type == 'sample':
            # sheet = labels.Sheet(self.specs, self.draw_sample, border=self.debug)

        sheet = labels.Sheet(self.specs, self.draw, border=self.debug)  

        # Add a couple of labels.
        for i in range(int(labels_used)):
            sheet.add_label({'blank':True})

        for entry in objects:
            sheet.add_label(entry)

        # Save the file and we are done.
        sheet.save(render_file)