Added.
It compiles and runs now!
Started implementing the GUI.
Started gluing everything together.
Implemented a bunch more stuff, including friction and drag.
I think drag is working now.
The grapple is working!
It's working!
Switched to a prettier method for drawing the rope (at minimal CPU expense).
Implemented garbage collecting and also genericised the grapple body.
Hacked together motion tracking for the grapple, and also distance displaying.
Added keyboard control.
Implemented the person!
Implemented grapple angling.
Added.
Started abstracting the user interface.
Implemented a keyboard interface.
Added.
The command line interface is almost working now!
The keyboard is now completely implemented in the curses interface.  Lines are now also drawn prettier.