In answer to https://stackoverflow.com/questions/71318333/why-is-this-permanent-trail-being-left-on-the-background-p5-canvas
The issue here is the way color blending works in canvas. The default blend mode is source-over which is defined as the following:
co = αs x Cs + αb x Cb x (1 – αs)
αo = αs + αb x (1 – αs)
Given the definitions:
| Symbol | Description |
| // ==UserScript== | |
| // @name Vim Mode for editor.p5js.org | |
| // @namespace https://gist.github.com/sflanker/85899dd893f60ff47f52efd56765d5ec#file-vim-mode-editor-p5js-org-js | |
| // @version 0.2 | |
| // @description Vim mode in code mirror (p5js.org) | |
| // @author dragulceo, sflanker | |
| // @license unlicense | |
| // @match https://editor.p5js.org/* | |
| // @grant none | |
| // ==/UserScript== |
| // ==UserScript== | |
| // @name Vim Mode for OpenProcessing | |
| // @namespace https://gist.github.com/sflanker/cab8e86bf29b221017f58ac2df42cdf7#file-openprocessing_codemirror_vim-user-js | |
| // @version 0.2 | |
| // @description Vim mode in code mirror (openprocessing) | |
| // @author dragulceo, sflanker | |
| // @license unlicense | |
| // @match https://openprocessing.org/sketch/* | |
| // @grant none | |
| // ==/UserScript== |
| (program "conway" | |
| (comment "This is an implementation of conway's game of life for a 32x32 toroidal grid.") | |
| (comment "For more information about Lizpy see: https://github.com/sflanker/lizpy/") | |
| (declarel part_ids) | |
| (declarel game_state_a) | |
| (declarel game_state_b) | |
| (declarel last_frame) |