1j01/textual-paint

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Isaiah Odhner 348d3489e3 Add to (and tweak) Known Issues

2023-05-15 00:15:49 -04:00

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Textual Paint

MS Paint in your terminal.

This is a TUI (Text User Interface) image editor, inspired by MS Paint, built with Textual.

This screenshot of Textual Paint is the terminal's screen buffer copied as HTML, wrapped in SVG, placed in HTML inside Markdown.
This might not render correctly in your browser.

Features

Open and save images
- Fancy file dialogs
- Drag and drop files to open
- Warnings when overwriting an existing file, or closing with unsaved changes
- Automatically saves a temporary .ans~ backup file alongside the file you're editing, for recovery in case of a crash
- File formats, chosen by typing a file extension in the Save As dialog:
  - ANSI (.ans) — Note that while it handles many more ANSI control codes when loading than those that it uses to save files, you may have limited success loading other ANSI files that you find on the web, or create with other tools. ANSI files can vary a lot and even encode animations!
  - Plain Text (.txt) — discards color information
  - SVG (.svg) — save only
  - HTML (.html) — save only
  - PNG (.png) — not yet
  - Bitmap (.bmp) — not yet
Tools
- Free-Form Select
- Select
- Eraser/Color Eraser
- Fill With Color
- Pick Color
- Magnifier
- Pencil
- Brush
- Airbrush
- Text
- Line
- Curve
- Rectangle
- Polygon
- Ellipse
- Rounded Rectangle
Color palette
Undo/Redo
Efficient screen updates and undo/redo history, by tracking regions affected by each action
- You could totally use this program over SSH! Haha, this "what if" project could actually be useful. Of course, it should be mentioned that you can also run graphical programs over SSH, but this might be more responsive, or just fit your vibe better.
Brush previews
Menu bar
Status bar
Keyboard shortcuts
Localization into 26 languages: Arabic, Czech, Danish, German, Greek, English, Spanish, Finnish, French, Hebrew, Hungarian, Italian, Japanese, Korean, Dutch, Norwegian, Polish, Portuguese, Brazilian Portuguese, Russian, Slovak, Slovenian, Swedish, Turkish, Chinese, Simplified Chinese

Usage

Command Line Options

$ python3 paint.py --help
usage: paint.py [options] [filename]

Paint in the terminal.

positional arguments:
  filename              Path to a file to open. File will be created if it
                        doesn't exist.

options:
  -h, --help            show this help message and exit
  --version             show program's version number and exit
  --theme {light,dark}  Theme to use, either "light" or "dark"
  --language {ar,cs,da,de,el,en,es,fi,fr,he,hu,it,ja,ko,nl,no,pl,pt,pt-br,ru,sk,sl,sv,tr,zh,zh-simplified}
                        Language to use
  --ascii-only-icons    Use only ASCII characters for tool icons
  --backup-folder FOLDER
                        Folder to save backups to. By default a backup is saved
                        alongside the edited file.
  --inspect-layout      Inspect the layout with middle click, for development
  --clear-screen        Clear the screen before starting; useful for
                        development, to avoid seeing fixed errors
  --restart-on-changes  Restart the app when the source code is changed, for
                        development
  --recode-samples      Open and save each file in samples/, for testing

Keyboard Shortcuts

Ctrl+D: Toggle Dark Mode
Ctrl+Q: Quit
Ctrl+Shift+S: Save As IF SHIFT IS DETECTED — might trigger Save instead, and overwrite the open file! ⚠️
Ctrl+Shift+Z: Redo IF SHIFT IS DETECTED — might trigger Undo instead.

The rest match MS Paint's keyboard shortcuts:

Ctrl+S: Save
Ctrl+O: Open
Ctrl+N: New
Ctrl+T: Toggle Tools Box
Ctrl+W: Toggle Colors Box
Ctrl+Z: Undo
Ctrl+Y: Redo
F4: Redo
Ctrl+A: Select All
Delete: Clear Selection
Ctrl+C: Copy
Ctrl+V: Paste
Ctrl+X: Cut
Ctrl+E: Image Attributes
Ctrl+PageUp: Large Size
Ctrl+PageDown: Normal Size

Tips

You can draw with a character by clicking the selected color display area in the palette and then typing the character, or by double clicking the same area to pick a character from a list.

You can set the text color by holding Ctrl while clicking a color in the palette, or while double clicking a color to open the Edit Colors dialog.

You can display a saved ANSI file in the terminal with cat:

cat samples/ship.ans

Known Issues

When saving as a TXT file, color information is discarded without warning. It is considered saved, so the backup will be discarded, even though the saved file doesn't match the visible document.
Undo/Redo doesn't work inside the Text tool's textbox. Ctrl+Z will delete the textbox. (Also note that the Text tool works differently from MS Paint; it will overwrite characters and the cursor can move freely, which makes it better for ASCII art and worse for prose.)
The selection box border appears inside instead of outside (and lacks dashes). For the text box, I hid the border because it was too visually confusing, but it should also have an outer border.
Pick Color can't be cancelled (with Esc or by pressing both mouse buttons), since it samples the color continuously.
Pressing both mouse buttons stops the current tool, but doesn't undo the current action.
Due to limitations of the terminal, shortcuts using Shift or Alt might not work.
Menus are not keyboard navigable.
The Zoom submenu flickers as it opens, and may not always open in the right place.
The canvas flickers when zooming in with the Magnifier tool.
Some languages don't display correctly.
Large files can make the program very slow, as can magnifying the canvas. There is a 500 KB limit when opening files to prevent it from freezing.
Free-Form Select stamping/finalizing is incorrect when the selection is off-screen to the left or top.
Moving the selection with the arrow keys does not cut out the selection from the canvas, it only moves the selection box.
Status bar description can be left blank when selecting a menu item
Menu items like Copy/Cut/Paste are not grayed out when inapplicable. Only unimplemented items are grayed out.
Set As Wallpaper may not work on your system. For me, on Ubuntu, the wallpaper setting is updated but the picture is not, unless I manually pick it. There is however untested support for many platforms, and you may have better luck than me.
If you paste and then stamp the selection with Ctrl+Click, the stamp(s) can't be undone. An undo state is only created when finalizing the selection, for pasted selections.
Pasting with middle click can crash the program if the clipboard is empty. See textual issue #2563
Clicking a folder in the file dialogs can cause the program to exit if there's a permission error. See textual issue #2564
The Open dialog's file tree view doesn't scroll down to the initially selected file/folder.
ANSI files (.ans) are treated as UTF-8 when saving and loading, rather than CP437 or Windows-1252 or any other encodings. Unicode is nice and modern terminals support it, but it's not the standard for ANSI files. There isn't really a standard for ANSI files.
ANSI files are loaded with a white background. This may make sense as a default for text files, but ANSI files either draw a background or assume a black background, being designed for terminals.

The program has only been tested on Linux. Issues on other platforms are as-yet unknown :)

Development

Install Textual and other dependencies:

pip install "textual[dev]" stransi psutil watchdog pyperclip pyright

Run via Textual's CLI for live-reloading CSS support, and enable other development features:

textual run --dev "src/textual_paint/paint.py --clear-screen --inspect-layout --restart-on-changes"

Or run more basically:

python src/textual_paint/paint.py

--clear-screen is useful for development, because it's sometimes jarring to see error messages that have actually been fixed, when exiting the program.

--inspect-layout lets you middle click to visualize the layout breakdown by labeling each widget in the hierarchy, and coloring their regions. The labels affect the layout, so you can also hold Ctrl to only colorize, and you can remember how the colors correspond to the labels, to build a mental model of the layout.

--restart-on-changes automatically restarts the program when any Python files change. This works by the program restarting itself directly. (Programs like modd or nodemon that run your program in a subprocess don't work well with Textual's escape sequences.)

There are also launch tasks configured for VS Code, so you can run the program from the Run and Debug panel. Note that it runs slower in VS Code's debugger.

To see logs, run textual console and then run the program via textual run --dev. This also makes it run slower.

Often it's useful to exclude events with textual console -x EVENT.

To test file encoding, run textual run --dev "src/textual_paint/paint.py --recode-samples".

If there are differences in the ANSI files, you can set up a special diff like this:

git config --local "diff.cat-show-all.textconv" "cat --show-all"

but you should check that cat --show-all samples/2x2.ans works on your system first. Also, note that it might not work with your Git GUI of choice; you may need to use the command line.

Linting

pyright  # type checking
cspell-cli lint .  # spell checking

Update Dependencies

python -m pipreqs.pipreqs --ignore .history --force

License

MIT

Unicode Symbols and Emojis for Paint Tools

The first thing I did in this project was to collect possible characters to represent all the tool icons in MS Paint, to gauge how good of a recreation it would be possible to achieve, starting from looks. Unfortunately, I haven't run into any significant roadblocks, so I'm apparently recreating MS Paint. Again.

These are the symbols I've found so far:

Free-Form Select: ✂️📐🆓🕸✨⚝🫥🇫/🇸◌⁛⁘ ⢼⠮
Select: ⬚▧🔲 ⣏⣹
Eraser/Color Eraser: 🧼🧽🧹🚫👋🗑️▰▱
Fill With Color: 🌊💦💧🌈🎉🎊🪣🫗
Pick Color: 🎨💉💅💧📌📍⤤𝀃🝯🍶
Magnifier: 🔍🔎👀🔬🔭🧐🕵️‍♂️🕵️‍♀️
Pencil: ✏️✎✍️🖎🖊️🖋️✒️🖆📝🖍️
Brush: 🖌️🖌👨‍🎨🧑‍🎨💅
Airbrush: 💨ᖜ╔🧴🥤🫠
Text: 🆎📝📄📃🔤📜AＡ
Line: 📏📉📈⟍𝈏╲⧹\⧵∖
Curve: ↪️🪝🌙〰️◡◠~∼≈∽∿〜〰﹋﹏≈≋～⁓
Rectangle: ▭▬▮▯🟥🟧🟨🟩🟦🟪🟫⬛⬜◼️◻️◾◽▪️▫️
Polygon: ▙𝗟𝙇﹄』⬣⬟🔶🔷🔸🔹🔺🔻△▲
Ellipse: ⬭⭕🔴🟠🟡🟢🔵🟣🟤⚫⚪🫧
Rounded Rectangle: ▢⬜⬛

The default symbols used may not be the best on your particular system, so I may add some kind of configuration for this in the future.

Cursor

A crosshair cursor could use one of +✜✛✚╋╬, but whilst that imitates the look, it might be better to show the pixel under the cursor, i.e. character cell, surrounded by dashes, like this:

 ╻
╺█╸
 ╹

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