HSLColor class
A color represented using alpha, hue, saturation, and lightness.
An HSLColor is represented in a parameter space that's based up human perception of colored light. The representation is useful for some color computations (e.g., combining colors of light), because interpolation and picking of colors as red, green, and blue channels doesn't always produce intuitive results.
HSL is a perceptual color model, placing fully saturated colors around a circle (conceptually) at a lightness of 0.5, with a lightness of 0.0 being completely black, and a lightness of 1.0 being completely white. As the lightness increases or decreases from 0.5, the apparent saturation decreases proportionally (even though the saturation parameter hasn't changed).
See also:
- HSVColor, a color that uses a color space based on human perception of pigments (e.g. paint and printer's ink).
- HSV and HSL Wikipedia article, which this implementation is based upon.
- Annotations
- @immutable
Constructors
Properties
- alpha → double
-
Alpha, from 0.0 to 1.0. The describes the transparency of the color.
A value of 0.0 is fully transparent, and 1.0 is fully opaque.
final
- hashCode → int
-
The hash code for this object. [...]
read-only, override
- hue → double
-
Hue, from 0.0 to 360.0. Describes which color of the spectrum is
represented. A value of 0.0 represents red, as does 360.0. Values in
between go through all the hues representable in RGB. You can think of
this as selecting which color filter is placed over a light.
final
- lightness → double
-
Lightness, from 0.0 to 1.0. The lightness of a color describes how bright
a color is. A value of 0.0 indicates black, and 1.0 indicates white. You
can think of this as the intensity of the light behind the filter. As the
lightness approaches 0.5, the colors get brighter and appear more
saturated, and over 0.5, the colors start to become less saturated and
approach white at 1.0.
final
- saturation → double
-
Saturation, from 0.0 to 1.0. This describes how colorful the color is.
0.0 implies a shade of grey (i.e. no pigment), and 1.0 implies a color as
vibrant as that hue gets. You can think of this as the purity of the
color filter over the light.
final
- runtimeType → Type
-
A representation of the runtime type of the object.
read-only, inherited
Methods
-
toColor(
) → Color - Returns this HSL color in RGB.
-
toString(
) → String -
Returns a string representation of this object.
override
-
withAlpha(
double alpha) → HSLColor - Returns a copy of this color with the alpha parameter replaced with the given value.
-
withHue(
double hue) → HSLColor -
Returns a copy of this color with the
hue
parameter replaced with the given value. -
withLightness(
double lightness) → HSLColor -
Returns a copy of this color with the
lightness
parameter replaced with the given value. -
withSaturation(
double saturation) → HSLColor -
Returns a copy of this color with the
saturation
parameter replaced with the given value. -
noSuchMethod(
Invocation invocation) → dynamic -
Invoked when a non-existent method or property is accessed. [...]
inherited
Operators
-
operator ==(
dynamic other) → bool -
The equality operator. [...]
override