HSL

import introcs

This class represents an HSL color value. As an additive color, it has conversion methods for tkinter, kivy and PIL. However, most of these methods require conversion to RGB color space before use.

HSL colors are represented by a double cone. Pure color values such as red or green are positioned at the vertical center of the cone, with a lightness value of 0.5.

Constructor

class introcs.HSL(h, s, l)

An instance is a HSL color value.

The hue range is not inclusive on the high end. So 359.99999 is a valid hue, but 360.0 is not. All other color values are inclusive.

Parameters

• h (float 0.0..360.0, not including 360.0) – the initial hue

• s (float 0.0..1.0) – the initial saturation

• l (float 0.0..1.0) – the initial lightness

Attributes

HSL.hue

The hue channel.

Invariant: Value must be a float between 0.0 and 360.0, not including 360.0.

HSL.saturation

The staturation channel.

Invariant: Value must be a float between 0.0 and 1.0, inclusive.

HSL.lightness

The lightness channel.

Invariant: Lightness must be a float between 0.0 and 1.0, inclusive.

Methods

HSL.glColor()

Converts thie color to an OpenGL value.

This conversion allows this object to be used by graphics libraries that depend on OpenGL (e.g. Kivy). The conversion first converts this object to the RGB color space.

Returns

a 4 element list of the attributes in the range 0 to 1

Return type

list

HSL.webColor()

Converts this color to a web color string.

This conversion allows this object to be used by graphics libraries that depend on Tkinter (e.g. the drawing turtle). The conversion first converts this object to the RGB color space.

Returns

a string representing a web color

Return type

str

HSL.rgba()

Converts this color to an rgba value.

This conversion allows this object to be used by graphics libraries that want integer color representation like PIL. The conversion first converts this object to the RGB color space.

Returns

a 4 element tuple of the attributes in the range 0 to 255

Return type

tuple