Data.CG.Minus.Colour

Colour related functions

Documentation

type C = Colour Double

Opaque colour.

type Ca = AlphaColour Double

Colour with alpha channel.

mk_grey :: (Ord a, Floating a) => a -> Colour a

Grey Colour.

to_greyscale :: (Ord a, Floating a) => Colour a -> a

Reduce Colour to grey. Constants are 0.3, 0.59 and 0.11.

to_greyscale_c :: (Ord a, Floating a) => Colour a -> Colour a

mk_grey . to_greyscale.

pureColour :: (Ord a, Fractional a) => AlphaColour a -> Colour a

Discard alpha channel, if possible.

Tuples

toC :: (Double, Double, Double) -> C

Tuple to C, inverse of unC.

unC :: C -> (Double, Double, Double)

C to (red,green,blue) tuple.

toCa :: (Double, Double, Double, Double) -> Ca

Tuple to Ca, inverse of unCa.

unCa :: Ca -> (Double, Double, Double, Double)

Ca to (red,green,blue,alpha) tuple

Constants

venetianRed :: C

Venetian red (#c80815).

swedishAzureBlue :: C

Swedish azure blue (#005b99).

safetyOrange :: C

Safety orange (#ff6600).

dyeMagenta :: C

Dye magenta (#ca1f7b).

candlelightYellow :: C

Candlelight yellow (#fcd116).

subtractivePrimaryCyan :: C

Subtractive primary cyan (#00B7EB).

fernGreen :: C

Fern green (#009246).

sepiaBrown :: C

Sepia brown (#704214).

non_svg_colour_set :: [C]

The set of named colours defined in this module.

SVG colours

svg_colour_set :: [C]

The set of named colours in the SVG specification (in alphabetical order).