Examples: draw lines of lines: (connect?).cpp, forever/forever.cpp, qmag/qmag.cpp, scribble/scribble.cpp, splitter/splitter.cpp, t8/cannon.cpp, and t9/cannon.cpp.
Examples: drawlines/connect.cpp, forever/forever.cpp, qmag/qmag.cpp, scribble/scribble.cpp, splitter/splitter.cpp, t8/cannon.cpp, and t9/cannon.cpp.