Copyright | Will Thompson Iñaki García Etxebarria and Jonas Platte |
---|---|
License | LGPL-2.1 |
Maintainer | Iñaki García Etxebarria (garetxe@gmail.com) |
Safe Haskell | None |
Language | Haskell2010 |
A RGBA
is used to represent a (possibly translucent)
color, in a way that is compatible with cairos notion of color.
- newtype RGBA = RGBA (ManagedPtr RGBA)
- newZeroRGBA :: MonadIO m => m RGBA
- noRGBA :: Maybe RGBA
- rGBACopy :: (HasCallStack, MonadIO m) => RGBA -> m RGBA
- rGBAEqual :: (HasCallStack, MonadIO m) => RGBA -> RGBA -> m Bool
- rGBAFree :: (HasCallStack, MonadIO m) => RGBA -> m ()
- rGBAHash :: (HasCallStack, MonadIO m) => RGBA -> m Word32
- rGBAParse :: (HasCallStack, MonadIO m) => RGBA -> Text -> m Bool
- rGBAToString :: (HasCallStack, MonadIO m) => RGBA -> m Text
- getRGBAAlpha :: MonadIO m => RGBA -> m Double
- setRGBAAlpha :: MonadIO m => RGBA -> Double -> m ()
- getRGBABlue :: MonadIO m => RGBA -> m Double
- setRGBABlue :: MonadIO m => RGBA -> Double -> m ()
- getRGBAGreen :: MonadIO m => RGBA -> m Double
- setRGBAGreen :: MonadIO m => RGBA -> Double -> m ()
- getRGBARed :: MonadIO m => RGBA -> m Double
- setRGBARed :: MonadIO m => RGBA -> Double -> m ()
Exported types
BoxedObject RGBA Source # | |
(~) AttrOpTag tag AttrSet => Constructible RGBA tag Source # | |
Methods
copy
equal
:: (HasCallStack, MonadIO m) | |
=> RGBA |
|
-> RGBA |
|
-> m Bool | Returns: |
Compares two RGBA colors.
Since: 3.0
free
:: (HasCallStack, MonadIO m) | |
=> RGBA |
|
-> m () |
hash
:: (HasCallStack, MonadIO m) | |
=> RGBA |
|
-> m Word32 | Returns: The hash value for |
A hash function suitable for using for a hash
table that stores GdkRGBAs
.
Since: 3.0
parse
:: (HasCallStack, MonadIO m) | |
=> RGBA |
|
-> Text |
|
-> m Bool | Returns: |
Parses a textual representation of a color, filling in
the red
, green
, blue
and alpha
fields of the rgba
RGBA
.
The string can be either one of:
- A standard name (Taken from the X11 rgb.txt file).
- A hexadecimal value in the form “rrggbb”, “rrrrggggbbbb”
- A RGB color in the form “rgb(r,g,b)” (In this case the color will have full opacity)
- A RGBA color in the form “rgba(r,g,b,a)”
Where “r”, “g”, “b” and “a” are respectively the red, green, blue and alpha color values. In the last two cases, r g and b are either integers in the range 0 to 255 or percentage values in the range 0% to 100%, and a is a floating point value in the range 0 to 1.
Since: 3.0
toString
:: (HasCallStack, MonadIO m) | |
=> RGBA |
|
-> m Text | Returns: A newly allocated text string |
Returns a textual specification of rgba
in the form
rgb (r, g, b)
or
rgba (r, g, b, a)
,
where “r”, “g”, “b” and “a” represent the red, green,
blue and alpha values respectively. r, g, and b are
represented as integers in the range 0 to 255, and a
is represented as floating point value in the range 0 to 1.
These string forms are string forms those supported by
the CSS3 colors module, and can be parsed by rGBAParse
.
Note that this string representation may lose some precision, since r, g and b are represented as 8-bit integers. If this is a concern, you should use a different representation.
Since: 3.0