I just built a quick Python Azure Function that generates a barcode. The response is ONLY the rendered barcode in .png format. I also need the barcode VALUE to be displayed below it.
Example:
import logging
import azure.functions as func
import code128
import io
from PIL import Image
barcode_param = '1234'
barcode_bytes = io.BytesIO()
logging.info('##### Generating barcode... #####')
barcode = code128.image(barcode_param, height=100).save(barcode_bytes, "PNG")
barcode_bytes.seek(0)
logging.info('##### Barcode successfully generated #####')
return func.HttpResponse(
barcode_bytes.getvalue(),
status_code=200,
mimetype='image/png'
)
barcode_bytes.close()
How can I add the barcode value to the barcode with the code128
library?
There are no options shown in the docs.
EDIT 1: After @Furas great example, I now have:
Code to produce:
import code128
import io
from PIL import Image, ImageDraw, ImageFont
# Get barcode value
barcode_param = 'SUFFERINSUCCOTASH'
# Create barcode image
barcode_image = code128.image(barcode_param, height=100)
# Create empty image for barcode + text
top_bott_margin = 70
l_r_margin = 10
new_height = barcode_image.height + (2 * top_bott_margin)
new_width = barcode_image.width + (2 * l_r_margin)
new_image = Image.new( 'RGB', (new_width, new_height), (255, 255, 255))
# put barcode on new image
barcode_y = 100
new_image.paste(barcode_image, (0, barcode_y))
# object to draw text
draw = ImageDraw.Draw(new_image)
# Define custom text size and font
h1_size = 28
h2_size = 28
h3_size = 16
footer_size = 21
h1_font = ImageFont.truetype("DejaVuSans-Bold.ttf", h1_size)
h2_font = ImageFont.truetype("Ubuntu-Th.ttf", h2_size)
h3_font = ImageFont.truetype("Ubuntu-Th.ttf", h3_size)
footer_font = ImageFont.truetype("UbuntuMono-R.ttf", footer_size)
# Define custom text
company_name = 'YAY! CORP.'
id1 = '11-22-33-44'
license_num = 'WHY SOYNTENLY!'
product_type = 'GRADE A GREATNESS'
center_product_type = (barcode_image.width / 2) - len(product_type) * 5
center_barcode_value = (barcode_image.width / 2) - len(barcode_param) * 8
# Draw text on picture
draw.text( (l_r_margin, 0), company_name, fill=(0, 0, 0), font=h1_font)
draw.text( (l_r_margin, h1_size), id1, fill=(0, 0, 0), font=h2_font)
draw.text( (l_r_margin + 2, (h1_size + h2_size + 5)), license_num, fill=(0, 0, 0), font=h3_font)
draw.text( (center_product_type, (h1_size + h2_size + h3_size)), product_type, fill=(0, 0, 0), font=footer_font)
draw.text( (center_barcode_value, (new_height - footer_size - 15)), barcode_param, fill=(0, 0, 0), font=h2_font)
# save in file
new_image.save('barcode_image.png', 'PNG')
# show in default viewer
import webbrowser
webbrowser.open('barcode_image.png')
Thanks mate!
You get code as Pillow image so you can use Pillow to add margin for text and to draw this text.
You can get original size
w, h = barcode_image.size
calculate new size
new_w = w # the same
margin = 20
new_h = h + (2*margin)
create empty image with white background
new_image = Image.new('RGB', (new_w, new_h), (255, 255, 255))
put original barcode in the middle of height
new_image.paste(barcode_image, (0, margin))
Next you can use ImageDraw
to create object which can draw objects or put text on image
draw = ImageDraw.Draw(new_image)
and you can put some text using text()
. You may need to use ImageFont
to load font and set size. I use default font and size.
#fnt = ImageFont.truetype("arial.ttf", 40)
draw.text( (10, new_h - 10), barcode_text, fill=(0, 0, 0))#, font=fnt)
and you have image with text in new_image
. And you can save it in file and check directly in web browser or you can convert to bytes and send to client.
In example I use standard module webbrowser
only to check image.
EDIT
As @RufusVS noted in comment I could use image_new.show()
instead of webbrowser
import code128
import io
from PIL import Image, ImageDraw, ImageFont
barcode_param = '1234'
barcode_text = 'theseahawksarewinning'
# original image
barcode_image = code128.image(barcode_param, height=100)
# empty image for code and text - it needs margins for text
w, h = barcode_image.size
margin = 20
new_h = h +(2*margin)
new_image = Image.new( 'RGB', (w, new_h), (255, 255, 255))
# put barcode on new image
new_image.paste(barcode_image, (0, margin))
# object to draw text
draw = ImageDraw.Draw(new_image)
# draw text
#fnt = ImageFont.truetype("arial.ttf", 40)
draw.text( (10, new_h - 10), barcode_text, fill=(0, 0, 0))#, font=fnt) #
# save in file
new_image.save('barcode_image.png', 'PNG')
# show in default viewer
import webbrowser
webbrowser.open('barcode_image.png')
# --- later send it---
barcode_bytes = io.BytesIO()
new_image.save(barcode_bytes, "PNG")
barcode_bytes.seek(0)
data = barcode_bytes.getvalue()
Doc: Image Image.new(), ImageDraw, ImageDraw.text() ImageFont