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tidy up

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This commit is contained in:
James Wah 2021-07-02 20:43:14 +10:00
parent 992a81425c
commit d52ef4b755
1 changed files with 7 additions and 10 deletions
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17
tspl.py
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@ -2,7 +2,7 @@
import tempfile import tempfile
import subprocess import subprocess
from PIL import Image, ImageOps from PIL import Image
def convert_pdf(pdfname, args=[]): def convert_pdf(pdfname, args=[]):
pbmfile = tempfile.NamedTemporaryFile(suffix='.pbm') pbmfile = tempfile.NamedTemporaryFile(suffix='.pbm')
@ -30,26 +30,23 @@ def convert_pdf_scaled(pdfname, max_width, max_height):
return im return im
def label_to_command(image, labelwidth_mm=100, labelheight_mm=150, dpi=203): def pdf2tspl(filename, labelwidth_mm=100, labelheight_mm=150, dpi=203):
"Centre the image on the label and generate a print command" labelwidth = int(round(labelwidth_mm / 25.4 * dpi))
labelwidth = labelwidth_mm / 25.4 * dpi labelheight = int(round(labelheight_mm / 25.4 * dpi))
labelheight = labelheight_mm / 25.4 * dpi
assert image.size[0] <= labelwidth + 5 image = convert_pdf_scaled(filename, labelwidth, labelheight)
assert image.size[1] <= labelheight + 5
paste_x = (labelwidth - image.size[0]) // 2 paste_x = (labelwidth - image.size[0]) // 2
paste_y = (labelheight - image.size[1]) // 2 paste_y = (labelheight - image.size[1]) // 2
row_bytes = (image.size[0] + 7) // 8 row_bytes = (image.size[0] + 7) // 8
command = b"SIZE %d mm\r\nCLS\r\nBITMAP %d,%d,%d,%d,0," % (labelwidth_mm, paste_x, paste_y, row_bytes, image.size[1]) command = b"\r\n\r\nSIZE %d mm\r\nCLS\r\nBITMAP %d,%d,%d,%d,0," % (labelwidth_mm, paste_x, paste_y, row_bytes, image.size[1])
command += image.tobytes() command += image.tobytes()
command += b"\r\nPRINT 1,1\r\n" command += b"\r\nPRINT 1,1\r\n"
return command return command
def print_pdf(filename): def print_pdf(filename):
im = convert_pdf_scaled(filename, 800, 1200) cmd = pdf2tspl(filename)
cmd = label_to_command(im)
with open("/dev/usb/lp0", "r+b") as prn: with open("/dev/usb/lp0", "r+b") as prn:
prn.write(cmd) prn.write(cmd)