Py5Graphics.alpha()

Extracts the alpha value from a color, scaled to match current Py5Graphics.color_mode().

Description

Extracts the alpha value from a color, scaled to match current Py5Graphics.color_mode().

The alpha() function is easy to use and understand, but it is slower than a technique called bit shifting. When working in color_mode(RGB, 255), you can achieve the same results as alpha() but with greater speed by using the right shift operator (>>) with a bit mask. For example, alpha(c) and c >> 24 & 0xFF both extract the alpha value from a color variable c but the later is faster.

This method is the same as alpha() but linked to a Py5Graphics object. To see example code for how it can be used, see alpha().

Underlying Java method: PGraphics.alpha

Syntax

alpha(rgb: int, /) -> float

Parameters

  • rgb: int - any value of the color datatype

Updated on September 11, 2021 16:51:34pm UTC