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Language	Haskell2010

WeekDaze.Colour.HTMLColour

Contents

Description

Synopsis

unitIntervalToHTMLColourCode :: (RealFrac unitInterval, Show unitInterval) => unitInterval -> HTMLColourCode
unitIntervalToRGB :: (Fractional alpha, Fractional unitInterval, Real alpha, Real unitInterval, Show alpha, Show unitInterval) => alpha -> alpha -> unitInterval -> unitInterval -> RGB unitInterval
htmlColourCodeToRGB :: (Integral i, Show i) => HTMLColourCode -> RGB i
rgbUnitIntervalToHTMLColourCode :: RealFrac unitInterval => RGB unitInterval -> HTMLColourCode

Functions

Calls unitIntervalToRGB, with default parameters to make 0 map to blue & 1 to red, & with a moderately high saturation.
Calls rgbUnitIntervalToHTMLColourCode to convert to an HTML colour-code.

Arguments

:: (Fractional alpha, Fractional unitInterval, Real alpha, Real unitInterval, Show alpha, Show unitInterval)
=> alpha	The angular span in the range [0 .. 2 * pi radians], to which the unit-interval is mapped.
-> alpha	The angular offset in radians.
-> unitInterval	The saturation in the unit-interval; 0 will always result in black.
-> unitInterval	The value in the unit-interval which is to be represented by a colour.
-> RGB unitInterval

Maps the specified value from the unit-interval to the corresponding spectral colour represented as RGB.
The mapping from the spectrum to RGB is performed by modeling the spectrum as a circular arc drawn on the colour triangle, of radius equal to the specified saturation, & centered on green. CAVEAT: this algorithm has no solid basis.
One may specify the angular span & angular offset of this arc, to define the values to which 0 & 1 map.

Translation

Represents the specified HTML colour-code as RGB 24-bit.

Arguments

:: RealFrac unitInterval
=> RGB unitInterval	Red, green & blue component-colours, each in the unit-interval.
-> HTMLColourCode

Represents the specified RGB as an HTML colour-code.