Class Colour

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Instance Methods

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__new__(cls, r, g, b, a=1.0)

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rgb(self)
Convert to an RGB triplet (alpha is not removed).

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__mul__(self, factor)
Scale the colour by some factor.

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opaque(self)
The same colour, but with alpha forced to 1.

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__add__(self, colour)
Overlay colours following normal composition (right on top).

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Static Methods

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from_rgb(rgb)

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Class Variables

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r = property(itemgetter(0), _replace(0))

g = property(itemgetter(1), _replace(1))

b = property(itemgetter(2), _replace(2))

a = property(itemgetter(3), _replace(3))

Method Details

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mul(self, factor)

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Scale the colour by some factor.

If factor is a single value, it is applied only to the RGB components; if it is a pair then the second value is applied to alpha (and folded in to RGB too). So 0.5 would reduce RGB by half; (1, 0.5) would reduce alpha by half (and scale RGB correspondingly); (0.5, 0.5) would scale RGB and reduce alpha (so pre-multiplied RGB would be numerically scaled by 0.25).

After scaling, values are clipped within (0, 1).