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A experimental mouse based 1-bit pixel art editor, written
in Rust and SDL2. It reads and writes to a homemade image
format, [OBI](https://git.peppe.rs/graphics/obi).
### Run
Requires SDL2 and SDL2_ttf.
```shell
# creates a new file if it dosen't exist
cargo run -- <filename>.obi
```
### Usage
`z/c`: zoom in/out
`w/a/s/d`: pan up/left/down/right
`Shift-c`: fit iamge to window
`q/e`: increase/decrease brush size
`1/3`: increase/decrease dither level
`x`: flip color
`tab`: show/hide grid
`i`: invert pixmap (breaks undo for now)
`f`: draw line from last point of contact with grid
`v`: cycle symmetry options, horizontal, vertical, radial, none
`u/r`: undo/redo
### Lisp REPL
Enter the REPL by pressing `(` on the keyboard. Complete the
lisp expression with a closing parenthesis and hit enter to
execute it. The REPL supports basic readline operations.
```lisp
(define (fac n) (if (<= n 1) 1 (* n (fac (- n 1)))))
(fac 5)
```
#### Supported commands:
`(toggle-grid)`: similar to pressing `tab` on the keyboard
`(save <filename>)`: saves the current file. optional
argument to save to a different filename than the one opened
from.
`(quit)`: quit the editor.
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