On Tuesday, 7 April 2015 15:43:44 UTC-7, kai.p...@gmail.com wrote:
> 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)
Thanks for taking the time to give such detailed suggestions - very much
appreciated!
K
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