Mercurial > parpg-source
comparison bGrease/color.py @ 41:ff3e395abf91
Renamed grease to bGrease (Basic Grease) to get rid of conflicts with an already installed grease.
| author | KarstenBock@gmx.net |
|---|---|
| date | Mon, 05 Sep 2011 15:00:34 +0200 |
| parents | grease/color.py@bc88f7d5ca8b |
| children | a6bbb732b27b |
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| 40:2e3ab06a2f47 | 41:ff3e395abf91 |
|---|---|
| 1 | |
| 2 class RGBA(object): | |
| 3 """Four channel color representation. | |
| 4 | |
| 5 RGBA colors are floating point color representations with color channel | |
| 6 values between (0..1). Colors may be initialized from 3 or 4 floating | |
| 7 point numbers or a hex string:: | |
| 8 | |
| 9 RGBA(1.0, 1.0, 1.0) # Alpha defaults to 1.0 | |
| 10 RGBA(1.0, 1.0, 0, 0.5) | |
| 11 RGBA("#333") | |
| 12 RGBA("#7F7F7F") | |
| 13 | |
| 14 Individual color channels can be accessed by attribute name, or the | |
| 15 color object can be treated as a sequence of 4 floats. | |
| 16 """ | |
| 17 | |
| 18 def __init__(self, r_or_colorstr, g=None, b=None, a=None): | |
| 19 if isinstance(r_or_colorstr, str): | |
| 20 assert g is b is a is None, "Ambiguous color arguments" | |
| 21 self.r, self.g, self.b, self.a = self._parse_colorstr(r_or_colorstr) | |
| 22 elif g is b is a is None: | |
| 23 try: | |
| 24 self.r, self.g, self.b, self.a = r_or_colorstr | |
| 25 except ValueError: | |
| 26 self.r, self.g, self.b = r_or_colorstr | |
| 27 self.a = 1.0 | |
| 28 else: | |
| 29 self.r = r_or_colorstr | |
| 30 self.g = g | |
| 31 self.b = b | |
| 32 self.a = a | |
| 33 if self.a is None: | |
| 34 self.a = 1.0 | |
| 35 | |
| 36 def _parse_colorstr(self, colorstr): | |
| 37 length = len(colorstr) | |
| 38 if not colorstr.startswith("#") or length not in (4, 5, 7, 9): | |
| 39 raise ValueError("Invalid color string: " + colorstr) | |
| 40 if length <= 5: | |
| 41 parsed = [int(c*2, 16) / 255.0 for c in colorstr[1:]] | |
| 42 else: | |
| 43 parsed = [int(colorstr[i:i+2], 16) / 255.0 for i in range(1, length, 2)] | |
| 44 if len(parsed) == 3: | |
| 45 parsed.append(1.0) | |
| 46 return parsed | |
| 47 | |
| 48 def __len__(self): | |
| 49 return 4 | |
| 50 | |
| 51 def __getitem__(self, item): | |
| 52 return (self.r, self.g, self.b, self.a)[item] | |
| 53 | |
| 54 def __iter__(self): | |
| 55 return iter((self.r, self.g, self.b, self.a)) | |
| 56 | |
| 57 def __eq__(self, other): | |
| 58 return tuple(self) == tuple(other) | |
| 59 | |
| 60 def __repr__(self): | |
| 61 return "%s(%.2f, %.2f, %.2f, %.2f)" % (self.__class__.__name__, | |
| 62 self.r, self.g, self.b, self.a) | |
| 63 | |
| 64 |