158 lines
7.1 KiB
Python
158 lines
7.1 KiB
Python
import os
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from io import BytesIO
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from typing import List
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from reportlab.graphics.barcode import code128
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from reportlab.lib.pagesizes import mm
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from reportlab.lib.styles import getSampleStyleSheet, ParagraphStyle
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from reportlab.pdfbase import pdfmetrics
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from reportlab.pdfbase.ttfonts import TTFont
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from reportlab.platypus import SimpleDocTemplate, Paragraph, Spacer, PageBreak
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from constants import APP_PATH
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from schemas.barcode import PdfBarcodeGenData
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class PDFGenerator:
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def __init__(self):
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ASSETS_FOLDER = os.path.join(APP_PATH, 'assets')
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FONTS_FOLDER = os.path.join(ASSETS_FOLDER, 'fonts')
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FONT_FILE_PATH = os.path.join(FONTS_FOLDER, 'DejaVuSans.ttf')
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self.page_width = 58 * mm
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self.page_height = 40 * mm
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pdfmetrics.registerFont(TTFont('DejaVuSans', FONT_FILE_PATH))
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# Get standard styles and create a new style with a smaller font size
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styles = getSampleStyleSheet()
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self.small_style = ParagraphStyle(
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'Small',
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parent=styles['Normal'],
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fontName='DejaVuSans', # Specify the new font
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fontSize=6,
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leading=7,
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spaceAfter=2,
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leftIndent=2,
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rightIndent=2
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)
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def generate_small_text(self, barcode_value, text, num_duplicates=1):
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buffer = BytesIO()
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# Create document with specified page size
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doc = SimpleDocTemplate(buffer,
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pagesize=(self.page_width, self.page_height),
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rightMargin=1 * mm,
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leftMargin=1 * mm,
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topMargin=1 * mm,
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bottomMargin=1 * mm)
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# Create paragraph with new style
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paragraph = Paragraph(text, self.small_style)
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# Get the width and height of the paragraph
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paragraph_width, paragraph_height = paragraph.wrap(self.page_width - 2 * mm, self.page_height)
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# Create barcode
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barcode_height = (self.page_height - paragraph_height * mm)
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available_width = self.page_width - 2 * mm # Adjust for margins
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# Approximate number of elements in a Code 128 barcode for average length
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num_elements = 11 * len(barcode_value) # Rough estimate: 11 elements per character
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# Calculate barWidth
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bar_width = available_width / num_elements
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barcode = code128.Code128(barcode_value,
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barWidth=bar_width,
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barHeight=barcode_height,
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humanReadable=True)
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# Function to draw barcode on canvas
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def add_barcode(canvas, doc):
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barcode_width = barcode.width
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barcode_x = (self.page_width - barcode_width) / 2 # Center the barcode
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barcode.drawOn(canvas, barcode_x, self.page_height - barcode.height - 5)
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# Create list of elements to add to the document
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elements = []
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for _ in range(num_duplicates):
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elements.append(Spacer(1, barcode_height + 2 * mm))
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elements.append(paragraph)
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elements.append(PageBreak())
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# Build document
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doc.build(elements[:-1], onFirstPage=add_barcode, onLaterPages=add_barcode) # Remove the last PageBreak
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buffer.seek(0)
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return buffer
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def generate(self, barcodes_data: List[PdfBarcodeGenData]):
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buffer = BytesIO()
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# Создаем документ с указанным размером страницы
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doc = SimpleDocTemplate(buffer,
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pagesize=(self.page_width, self.page_height),
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rightMargin=1 * mm,
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leftMargin=1 * mm,
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topMargin=1 * mm,
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bottomMargin=1 * mm)
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# Список элементов для добавления в документ
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elements = []
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product_barcode_canvases = []
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product_counter = 0
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product_barcodes_counter = 0
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for barcode_data in barcodes_data:
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# Создаем абзац с новым стилем
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paragraph = Paragraph(barcode_data.text, self.small_style)
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# Получаем ширину и высоту абзаца
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paragraph_width, paragraph_height = paragraph.wrap(self.page_width - 2 * mm, self.page_height)
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# Рассчитываем доступное пространство для штрихкода
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human_readable_height = 6 * mm # Высота human-readable текста
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space_between_text_and_barcode = 4 * mm # Отступ между текстом и штрихкодом
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barcode_height = self.page_height - paragraph_height - human_readable_height - space_between_text_and_barcode - 4 * mm # Учитываем поля и отступы
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# Создаем штрихкод
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available_width = self.page_width - 2 * mm # Учитываем поля
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# Приблизительное количество элементов в штрихкоде Code 128 для средней длины
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num_elements = 11 * len(barcode_data.barcode_value) # Примерная оценка: 11 элементов на символ
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# Рассчитываем ширину штриха
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bar_width = available_width / num_elements
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barcode = code128.Code128(barcode_data.barcode_value,
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barWidth=bar_width,
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barHeight=barcode_height,
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humanReadable=True)
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product_barcode_canvases.append(barcode)
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# Добавление штрихкодов в список элементов документа
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for _ in range(barcode_data.num_duplicates):
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elements.append(paragraph)
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elements.append(Spacer(1, space_between_text_and_barcode)) # Отступ между текстом и штрихкодом
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elements.append(PageBreak())
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# Функция для отрисовки штрихкода на canvas
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def add_barcode(canvas, doc):
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nonlocal product_barcodes_counter, product_counter
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barcode_canvas = product_barcode_canvases[product_counter]
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barcode_width = barcode_canvas.width
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barcode_x = (self.page_width - barcode_width) / 2 # Центрируем штрихкод
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barcode_y = human_readable_height + 2 * mm # Размещаем штрихкод снизу с учетом отступа
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barcode_canvas.drawOn(canvas, barcode_x, barcode_y)
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product_barcodes_counter += 1
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if product_barcodes_counter >= barcodes_data[product_counter].num_duplicates:
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product_barcodes_counter = 0
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product_counter += 1
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# Создаем документ
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doc.build(elements[:-1], onFirstPage=add_barcode, onLaterPages=add_barcode) # Убираем последний PageBreak
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buffer.seek(0)
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return buffer
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