A simple module to handle colors
Project description
Verna
A simple module to handle colors
Only RGBA colors are supported at the moment.
Installation
You need Python>=3.6 to use Verna.
It can be installed from PyPI with pip using
pip install verna
Usage
Colors are represented using objects of class Color
.
The color value is essentially stored as an integer as the integer
attribute.
Alpha channel value can be set to denote opacity level.
The following properties can be used to access the different color components.
color.alpha
color.red
color.green
color.blue
where color
is an instance of Color
.
The different color components can be edited with one of the following values
- an integer from 0 to 255 (eg: 0xff, 255)
- a float from 0.0 to 1.0 (eg: 0.4)
A value outside of valid range would cause exception.
So, the following are valid:
color = Color(0x00ffff)
color.alpha = 0x80
color.alpha = 0.5
color.red = 0xff # Same as color.red = 255
color.green = 217
color.blue = 0xf5
color.blue = 0.75
whereas the following will cause error:
color = Color(0x00ffff)
color.alpha = 0x1ff # > 0xff
color.alpha = -1 # < 0.0
color.alpha = 1.2 # > 1.0
color.alpha = True # Invalid type: bool
Color component value conversions
Following functions can be used for basic inter-conversion for the color component values:
> Color.to_int()
Example:
>>> color = Color.from_name("red") # 0xff0000
>>> red_int = Color.to_int(color.red) # 255
Convert a float in the range of 0.0 till 1.0 towards an int in the range of 0 to 255.
> Color.to_float()
Example:
>>> color = Color.from_name("darkolivegreen") # 0x556b2f
>>> red_float = Color.to_float(color.red) # 0.1843137254901961
Convert an int in the range of 0 till 255 towards a float in the range of 0 to 0.1
Conversion to percentage values can be done by multiplying the float
value obtained with Color.to_float()
by 100.
>>> float_val = Color.to_float(54) # 0.21176470588235294
>>> percentage = float_val * 100 # 21.176470588235294
Creating `Color` object
A Color
object may be created in multiple ways.
From integer color code
For example, cyan (solid), which has color code 0x00ffff
can be created like
Color(0x00ffff)
which is same as
Color(65535)
From color name
Color.from_name()
can be used to create Color
objects from a CSS3 color name.
For example, cyan can be created with
Color.from_name('cyan')
From RGBA values
Color.from_rgba()
can be used to create an instance of Color
from RGBA values.
Color.from_rgba(255, 255, 0) # solid yellow
Color.from_rgba(255, 255, 0, 0.5) # translucent yellow
Other methods
Color.replace(red, green, blue, alpha)
Create a new Color
object by replacing some of the component values
of a Color
object.
Example:
>>> color = Color(0x8000ffff)
>>> color.replace(red=0x80, green=59, blue=0.5) # color with hex value 0x80803b80
Color.rgba()
Returns the color component values of red
, green
, blue
, alpha
as a tuple.
Example:
>>> color = Color(0x8000ffff)
>>> color.rgba()
(0, 255, 255, 0.5)
hex()
Return hexcode of the color value in ARGB format as a string.
Example:
>>> color = Color(0x8000ffff)
>>> hex(color)
0x8000ffff
int()
Return color of the color value in ARGB format as an integer.
Example:
>>> color = Color(0x8000ffff)
>>> int(color)
2147549183
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