A reimplementation of The Binding of Isaac: Rebirth's proprietary animation editor. Manipulates the XML-based ".anm2" format, used for in-game tweened animations.

Features

Most things present in the original IsaacAnimationEditor.exe, except some stuff like drawing (why not use an art program!)
Smooth Dear ImGui interface; docking, dragging and dropping, etc.
Keybinds/keyboard control for common actions(see src/input.h)

To do

Windows release
Undo queue
GIF export
Some other things I can't think of

Known Issues

Root Transform doesn't work for scale/rotation (matrix math is hard; if you can help me fix it I will give you $100.)
Some .anm2 files used in Rebirth might not render correctly due to the ordering of layers; just drag and drop to fix the ordering and save, they will work fine afterwards.
On startup, you will have to configure the windows yourself.
Probably several bugs that elude me

Dependencies

Download these from your package manager:

SDL3
GLEW

Build

After cloning and enter the repository's directory, make sure to initialize the submodules:

git submodules update --init

Then:

mkdir build

cd build

cmake ..

make -j