sliding_clock.py

#!/usr/bin/python
# Sliding digital clock on RGB led panel
# multiple module capability added by A.Montefusco 2017, 
# requires ledpanel.ko 2.0

import time
import sys
import os
from datetime import datetime
from PIL import ImageFont
from PIL import Image
from PIL import ImageDraw
import StringIO
import probe

if len(sys.argv)<2 or len(sys.argv)>4:
	print "Syntax:"
	print "  %s r g b" % (sys.argv[0])
	quit()

print "Panel size: %d x %d\n" % (probe.panel_w, probe.panel_h)

font = ImageFont.truetype('fonts/Ubuntu-B.ttf', probe.panel_h)

r=int(sys.argv[1])
g=int(sys.argv[2])
b=int(sys.argv[3])
  
im = Image.new("RGB", (probe.panel_w, probe.panel_h), "black")
draw = ImageDraw.Draw(im)
draw.fontmode="1" #No antialias
width, height = font.getsize("88:88:88")
 
def format_time():
    d = datetime.now()
    return "{:%H:%M:%S}".format(d)
 
message = format_time()
x = probe.panel_w

out_file = open("/sys/class/ledpanel/rgb_buffer","w")
output = StringIO.StringIO()
while True:
	x = x - 1

	if x < -(width):
		x = probe.panel_w
		message = format_time()
		continue
		
	draw.rectangle((0, 0, probe.panel_w - 1, height), outline=0, fill=0)
	draw.text((x, -1), message, (r<<5,g<<5,b<<5), font=font)

	output.truncate(0)
	im.save(output, format='PPM')
	buf=output.getvalue()

	out_file.seek(0)
	out_file.write(buf[13:])

out_file.close()