Bitmap/Read a PPM file: Difference between revisions
Added 11l
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Alextretyak (talk | contribs) (Added 11l) |
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'''Task''': Use [[write ppm file]] solution and [[grayscale image]] solution with this one in order to convert a color image to grayscale one.
=={{header|11l}}==
{{trans|Python}}
<lang 11l>T Colour
Byte r, g, b
F (r, g, b)
.r = r
.g = g
.b = b
F ==(other)
R .r == other.r & .g == other.g & .b == other.b
V black = Colour(0, 0, 0)
V white = Colour(255, 255, 255)
T Bitmap
Int width, height
Colour background
[[Colour]] map
F (width = 40, height = 40, background = white)
assert(width > 0 & height > 0)
.width = width
.height = height
.background = background
.map = (0 .< height).map(h -> (0 .< @width).map(w -> @@background))
F fillrect(x, y, width, height, colour = black)
assert(x >= 0 & y >= 0 & width > 0 & height > 0)
L(h) 0 .< height
L(w) 0 .< width
.map[y + h][x + w] = colour
F set(x, y, colour = black)
.map[y][x] = colour
F get(x, y)
R .map[y][x]
F togreyscale()
L(h) 0 .< .height
L(w) 0 .< .width
V (r, g, b) = .get(w, h)
V l = Int(0.2126 * r + 0.7152 * g + 0.0722 * b)
.set(w, h, Colour(l, l, l))
F writeppmp3()
V magic = "P3\n"
V comment = "# generated from Bitmap.writeppm3\n"
V s = magic‘’comment‘’("#. #.\n#.\n".format(.width, .height, 255))
L(h) (.height - 1 .< -1).step(-1)
L(w) 0 .< .width
V (r, g, b) = .get(w, h)
s ‘’= ‘ #3 #3 #3’.format(r, g, b)
s ‘’= "\n"
R s
F tokenize(fstr)
[String] tokens
L(line) fstr.split("\n")
I !line.starts_with(‘#’)
L(t) line.split(‘ ’, group_delimiters' 1B)
tokens.append(t)
R tokens
F ppmp3tobitmap(fstr)
V tokens = tokenize(fstr)
V tokeni = -1
F nexttoken()
@tokeni++
R @tokens[@tokeni]
assert(‘P3’ == nexttoken(), ‘Wrong filetype’)
V width = Int(nexttoken())
V height = Int(nexttoken())
V maxval = Int(nexttoken())
V bitmap = Bitmap(width, height, Colour(0, 0, 0))
L(h) (height - 1 .< -1).step(-1)
L(w) 0 .< width
V r = Int(nexttoken())
V g = Int(nexttoken())
V b = Int(nexttoken())
bitmap.set(w, h, Colour(r, g, b))
R bitmap
V ppmtxt = |‘P3
# feep.ppm
4 4
15
0 0 0 0 0 0 0 0 0 15 0 15
0 0 0 0 15 7 0 0 0 0 0 0
0 0 0 0 0 0 0 15 7 0 0 0
15 0 15 0 0 0 0 0 0 0 0 0
’
V bitmap = ppmp3tobitmap(ppmtxt)
print(‘Grey PPM:’)
bitmap.togreyscale()
print(bitmap.writeppmp3())</lang>
{{out}}
<pre>
Grey PPM:
P3
# generated from Bitmap.writeppm3
4 4
255
0 0 0 0 0 0 0 0 0 4 4 4
0 0 0 11 11 11 0 0 0 0 0 0
0 0 0 0 0 0 11 11 11 0 0 0
4 4 4 0 0 0 0 0 0 0 0 0
</pre>
=={{header|Ada}}==
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