Pixel art editor for the js1k competition in 2019

Controls

• Click on the palette to switch color.
• Click on the toolbar items to switch tool or undo/redo.
• Keyboard: 1,2,3 activates paint, fill, rectangle.
• Keyboard: 0 cycles through the palette.

Other features

• CGA Color palette
• Preview mini-image
• Infinite undo/redo.

Notes

• Uses hacks to reduce the final crushed size. Most of the hacks are documented directly in the code.
• I didn't try to be smarter than the closure compiler. It does an excellent job, and all I did is helping it a bit.
• The coding style is not consistent. Sometimes using a function reduces binary size, and sometimes inlining the code wins. This is because the code runs through regpack which is good at reducing code size in presence of duplication.

Minimizing

1. Replace const and let with var. For example, with sed: sed -e s/const\ /var\ /g -e s/let\ /var\ /g pixel-editor.js.
2. Run Closure compiler with the following flags: -O advanced --rewrite_polyfills=false --language_out ES6 --charset UTF-8 --strict_mode_input=false.
3. Run after-closure.js with nodejs.
4. Run regpack with the following flags: --crushGainFactor 1 --crushLengthFactor 0 --crushCopiesFactor 0

These are the minimizers and flags that worked well for this particular code. I aways ran multiple minimizers on every build (including uglify-es and jscrush) and picked the combination that produced the smallest result.

License

GPL v3

What can you use this code for.

By default, whatever the GPL v3 allows. If you need to use it for something not allowed by GPL v3, please contact me.