Copyright	(c) Daniel Winograd-Cort 2015
License	see the LICENSE file in the distribution
Maintainer	dwc@cs.yale.edu
Stability	experimental
Safe Haskell	Safe-Inferred
Language	Haskell98

FRP.UISF.Graphics.Color

Description

Synopsis

Documentation

data Color Source

We provide a data type for colors to allow users to easily and clearly specify common colors. Primary and secondary RGB colors are represented along with a few beige colors for use in many GUI elements.

Constructors

Black
Blue
Green
Cyan
Red
Magenta
Yellow
White
Gray
VLightBeige
LightBeige	This is the default background color for the UI window.
MediumBeige
DarkBeige

Instances

Bounded Color
Enum Color
Eq Color
Ord Color
Read Color
Show Color
Ix Color
NFData Color

data RGB Source

RGB can be used to specify colors more precisely. Create them with one of the two smart constructors rgb or rgbE.

Instances

Eq RGB
Show RGB
NFData RGB

colorToRGB :: Color -> RGB Source

Generally used as an internal function for converting Color to RGB, but can be used by anyone.

rgb :: (Integral r, Integral g, Integral b) => r -> g -> b -> Maybe RGB Source

This function takes three integral values between 0 and 255 inclusive and create an RGB value with them. If any of the values fall outside the acceptable range, Nothing is returned.

rgbE :: (Integral r, Integral g, Integral b, Show r, Show g, Show b) => r -> g -> b -> RGB Source

This is a version of rgb that throws an error when a given value falls outside the acceptable 0-255 range. The error message shows the bad input, so the extra Show constraint is necessary.

extractRGB :: (Integral r, Integral g, Integral b) => RGB -> (r, g, b) Source

Use this to extract the values from an RGB color.