I just wrote this bit (coming from Pascal) and am wondering how seasoned Python
programmers would have done the same? Anything terribly non-python?
As always, thanks for all input.
K
"""
Creates a PNG image from EPD file
"""
import os, sys
from PIL import Image, ImageFont, ImageDraw
# -----------------------------------------------------------------------------
def RenderByte(draw, byte, x, y):
blist = list(bin(byte).lstrip('0b')) # turn byte into list with 8 elements,
c = 0 # each representing one bit
for bit in blist:
if bit:
draw.point((x + c, y), fcolor)
c += 1
return
# -----------------------------------------------------------------------------
def EPD_2_Image(edpfilename, imagefilename):
# get out of here if EPD file not present
if not os.path.isfile(epdfilename):
print 'file not found: ' + edpfilename
return
# is this a valid EPD file?
filesize = os.path.getsize(epdfilename)
if (((xdim / 8) * ydim) + header) <> filesize:
print 'incorrect file size: ' + edpfilename
return
# blow old destination file away
if os.path.isfile(imagefilename):
print 'deleting old dest. file: ' + imagefilename
os.remove(imagefilename)
print 'processing...'
# set up PIL objects
img = Image.new('1', (xdim, ydim), bcolor) # '1' = Bi-tonal image
draw = ImageDraw.Draw(img)
# read entire EPD file into byte array (without the header)
content = bytearray(open(epdfilename, 'rb').read())[16:]
# image coord origin at top/left according to PIL documentation
pos = 0
for y in range(ydim):
x = 0
for byte in range(xdim / 8): # 8 pixels 'stuffed' into one byte
RenderByte(draw, content[pos], x, y)
pos += 1
x += 8
img.save(imagefilename) # format is inferred from given extension
print 'done.'
return
# -----------------------------------------------------------------------------
xdim = 1024
ydim = 1280
header = 16
black = 0
white = 1
bcolor = black
fcolor = white
epdfilename = 'c:\\temp\\drawtest2.epd'
imagefilename = 'c:\\temp\\drawtest2.png'
EPD_2_Image(epdfilename, imagefilename)
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