Lines Are Beautiful

A C++ file API for the reMarkable e-ink tablet.

Warning: The libraries and tools in this project are not (yet) hardened for malicious input. Only process files that you can trust with it!

Dependencies

• A C++11 capable compiler such as
  • GCC 4.8+ (tested)
  • Clang 3.9+ (tested)
• CMake 3.7+
• PNGwriter 0.7.0+ (optional for png converts; extend environment variable CMAKE_PREFIX_PATH with its install location)

Install

Spack

spack install rmlab
spack load rmlab

From Source

If one of the popular user-level package managers above is not already satisfying your needs, install from source via:

git clone https://github.com/ax3l/lines-are-beautiful.git

mkdir lines-are-beautiful/build
cd lines-are-beautiful/build

# for own install prefix append: -DCMAKE_INSTALL_PREFIX=$HOME/somepath
cmake ..

make -j

# optional
make test

# sudo is only required for system paths
sudo make install

Usage CLI

Lines Are Beautiful comes with several tools to handle files produced by the tablet. Try them on your own files inside $HOME/.local/share/remarkable/xochitl/ :-)

PNG renderer

This is a small example implementing a renderer for PNG while changing the brush type.

# path to the directory containing the notebook
lines2png share/rmlab/examples/aa90b0e7-5c1a-42fe-930f-dad9cf3363cc
#   creates files "test-0.png", "test-1.png", ... per page in the current directory

Note: this tool depends on an installed PNGwriter dependency.

SVG renderer

This notebook renderer creates a set of SVG files, one for each page. Implementation status:

• [x] Basic strokes.
• [x] Initial brush size.
• [x] Brush color.
• [x] Highlighter.
• [x] Normal eraser.
• [x] Region eraser.
• [x] Layers.
• [ ] Brush size variation based on pressure/tilt.
• [ ] Brush texture.

# path to the directory containing the notebook
lines2svg share/rmlab/examples/e09e6bd4-3647-41e7-98be-b9c3b53d80c8
#   creates files "test-0.svg", "test-1.svg", ... per page in the current directory

Usage API

Set environment hints:

# optional: only needed if installed outside of system paths
export CMAKE_PREFIX_PATH=/your/path/to/installed/path:$CMAKE_PREFIX_PATH

Add to your CMakeLists.txt:

# supports:                     COMPONENTS PNG
find_package(Rmlab 0.1.0 CONFIG)

target_link_libraries(YourTarget PRIVATE Rmlab::Rmlab)

Alternatively, add whole repository directly to your project and add it via:

add_subdirectory("path/to/source/of/lines-are-beautiful")

target_link_libraries(YourTarget PRIVATE Rmlab::Rmlab)

In your C++ files (see Doxygen):

#include <rmlab/rmlab.hpp>
#include <iostream>

// ...

rmlab::Notebook myNotebook("share/rmlab/examples/aa90b0e7-5c1a-42fe-930f-dad9cf3363cc");

for( auto & page : myNotebook.pages )
    for( auto & layer : page.layers )
        for( auto & line : layer.lines )
            for( auto & point : line.points )
                std::cout << point.x << " " << point.y << std::endl;

Resources

Blog Articles, Talks

• general
• file format
• 5' talk at 34C3 [en]:
  • slides
  • video (around minute 23+)
• talk at Datenspuren 2018 [de]:
  • slides
  • video

Experimental Implementation in Rust

• every C++ programmer likes to learn Rust: lines-are-rusty

Disclaimer

This is a hobby project.

The author(s) and contributor(s) are not associated with reMarkable AS, Norway. reMarkable is a registered trademark of reMarkable AS in some countries. Please see https://remarkable.com for their product.