Graphics.Curves.Colour

RGBA colour values.

Documentation

type Colour = Colour' Scalar

RGBA values in the range 0.0 to 1.0.

data Colour' a

RGBA values parameterised on the colour value type.

Constructors

Colour

Fields

getRed :: !a

getGreen :: !a

getBlue :: !a

getAlpha :: !a

Instances

Functor Colour'

Applicative Colour'

Foldable Colour'

Traversable Colour'

Eq a => Eq (Colour' a)

(Ord a, Num a) => Num (Colour' a)

Ord a => Ord (Colour' a)

Show a => Show (Colour' a)

truncColour :: (Ord a, Num a) => Colour' a -> Colour' a

opacity :: Scalar -> Colour -> Colour

 opacity a c = setAlpha (a * getAlpha c) c

opaque :: Colour -> Colour

 opaque = setAlpha 1

setAlpha :: Scalar -> Colour -> Colour

Set the alpha value of a colour.

isTransparent :: Colour -> Bool

Check if a colour is completely transparent.

visible :: Colour -> Maybe Colour

visible c == Nothing iff isTransparent c

transparent :: Colour

Completely transparent (and black) colour.

white :: Colour

blue :: Colour

green :: Colour

red :: Colour

black :: Colour

blend :: Colour -> Colour -> Colour

Alpha blending two colours.