This project requires documentation, testing procedures and coverage reports urgently. As of now, methods and classes are not tested, and this is a potential cause for unexpected issues.

The main difficulty regarding testing implementations is the nature of the project, which is designed for the user to interact with via click and key press events, which might be hard to replicate.

The canvas should implement a functionality that allows the user to call the program from any Python script/interpreter as a function call, such as canvas.open(width, height, number_of_lines). The output could then be stored in a variable via return statement. After the coordinates have been generated, the program should continue execution.

The canvas should implement new per-line output formats, which could be chosen via command line argument, additional input or additional sources.

Proposed formats:

• Split-component series: {"x": [x_1, ..., x_n], "y": [y_1, ..., y_n]}
• Sequence of dictionaries: [{"x": x_1, "y": y_1}, ..., {"x": x_n, "y": y_n}]
• Sequence of tuples: [[x_1, y_1], ..., [x_n, y_n]]
• Sequence of Coordinate objects: [Coordinate(x_1, y_1), ..., Coordinate(x_n, y_n)]¹

Furthermore, an output format selection procedure must be designed.

An interesting functionality would be to be able to remove coordinates from the canvas. This operation could be performed in two ways:

1. Last coordinate removal upon DEL key press (easiest to implement).
   • Certain limits must be taken into account, such as no coordinates left in the line.
2. Any coordinate removal upon rigth-click press (hardest to implement).
   • This method must take into account a valid interaction area, since coordinates do not have "width" or "height" and thus do not represent areas to be clicked. Maybe a distance-to-coordinate function could be implemented to support this implementation.
   • Clicks must only be valid in a certain distance range to the coordinate, in order to avoid strange behavior.

It would be great if stored canvas data (as of now, JSON files) could be passed as argument in order to be read¹. This would allow the user to retrieve data and modify² it as they wish.