tweet-printer/test.py

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Python
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2018-05-11 08:40:35 +00:00
#!/usr/bin/env python3
import math
import PIL
from PIL import Image
def line(w, h=1):
out = [0x1d, 0x76, 0x30, 0x00]
out += [math.ceil(w/8), (w//8)//256]
out += [h%256, h//256]
print(w,h,out)
data = [0xFF]*(w//8)
last = 0
for i in range(w%8):
last += 2**(7-i)
if last != 0:
data.append(last)
print(len(data))
for i in range(h):
out += data
print(len(out))
return bytes(out)
def size_for_printer(w,h):
return [math.ceil(w/8), (w//8)//256, h%256, h//256]
def print_image(filename):
img = Image.open(filename)
w, h = img.size
needs_resize = False
if w>576:
f = 576/w
nw = int(w*f)
nh = int(h*f)
needs_resize=True
img = img.convert("1")
if needs_resize:
img = img.resize((nw, nh), PIL.Image.NEAREST)
data = [0x1d, 0x76, 0x30, 0x00] + size_for_printer(*img.size)
for y in range(img.height):
current_byte = 0
current_bit = 0
for x in range(img.width):
l = img.getpixel((x, y))
to_add = 1<<(7-current_bit)
current_byte += to_add if l<127 else 0
current_bit += 1
if current_bit>7:
data.append(current_byte)
current_bit = 0
current_byte = 0
if current_bit != 0:
data.append(current_byte)
return bytes(data)
def main():
with open("/dev/usb/lp1", "wb") as lp:
lp.write(bytes([0x1b, 0x40]))
lp.write(bytes([0x1b, 0x74, 0x06]))
lp.write(" 0123456789ABCDEF0123456789ABCDEF".encode("latin-1"))
lp.write(bytes([13,10]))
for offs in range(7):
lp.write((hex(2+2*offs)[-1]+" ").encode("latin-1"))
for c in range(32):
lp.write(bytes([(1+offs)*0x20+c]))
lp.write(bytes([13,10]))
#lp.write("Hier kommt ein ".encode("latin-1"))
#lp.write(print_image("inline.bmp"))
#lp.write("-Emoji".encode("latin-1"))
#lp.write(bytes([0x0d, 0x0a]))
#lp.write(print_image("test6.bmp"))
#lp.write(bytes([0x0d, 0x0a]))
lp.write(bytes([0x1d, 0x56, 0x42, 25]))
lp.flush();
if __name__ == "__main__":
main()