From: Harold Hausman <hhausman@...>
Date: 2005-10-12T10:23:09+09:00
Subject: Re: [QUIZ] [Solution] Text Image (#50)

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Hi,

Best quiz yet. Er, well, quiz which held my attention longest anyway. :)

My solution is um, less... elegant, than some of the others, but in a lot o=
f
ways, like a parent who mistakenly thinks their ugly child is cute I kinda
like it. I don't really share my code a lot (maybe for obvious reasons) but
I'm just so pleased with how easily ruby lets me hack things to high heaven
and this one in particular makes me smile. Take special note that it only
works on 24 bit .bmp files and put your hard hat on if you think you're
going to feed anything but that into it. ;) Okay, enough blather, without
further ado, the first code I've shared with you guys:

#It only supports 24bit bmp files, and it even chokes on most of them ;)
#It creates one character per pixel (which has obvious implications)
#But it's 40 lines of pure ruby no lib use binary file up-hackery...
#And quite frankly, thats what I do.

MyPixel =3D Struct.new( 'MyPixel', :r, :g, :b )

the_gradient =3D %w|D Y 8 S 6 5 J j t c + i ! ; : .|
###############PUT YOUR FILENAME
HERE#########################################
the_file =3D File.new('ducky.bmp', 'rb')
the_file.read(2) #BM
the_file.read(4).unpack('V')[0] #filesize
the_file.read(4) #unused
the_file.read(4).unpack('V')[0] #offset from beginning to bitmap data
the_file.read(4).unpack('V')[0] #size of bitmap header
image_x =3D the_file.read(4).unpack('V')[0] #width x in pixels
image_y =3D the_file.read(4).unpack('V')[0] #height y in pixels
the_file.read(2).unpack('v')[0] #planes?
the_file.read(2).unpack('v')[0] #bits per pixel
the_file.read(24) #unused

the_bitmap =3D []
puts "CRRRRUNCHHHH --- please wait, reading file..."
image_y.times do |row|
the_bitmap[row] =3D []
image_x.times do |col|
the_bitmap[row][col] =3D MyPixel.new( 0, 0, 0 )
the_bitmap[row][col].b =3D the_file.read(1).unpack('c')[0]
the_bitmap[row][col].g =3D the_file.read(1).unpack('c')[0]
the_bitmap[row][col].r =3D the_file.read(1).unpack('c')[0]
end
end

puts "output coming:"
the_output =3D File.new('output.asciiart', 'w')
(image_y-1).downto(0) do |row|
image_x.times do |col|
the_avg =3D
(the_bitmap[row][col].b+the_bitmap[row][col].g+the_bitmap[row][col].r)/3
the_output.write(the_gradient[the_avg>>4])
end
the_output.write("\n")
end

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