Commands for Sweeper [general] * escape: quit * f: toggle fullscreen * space: toggle play/pause * backspace: set line to init [line size] * down arrow: make line thinner * up arrow: make line fatter [speed control] * right arrow: speed up * down arrow: speed low [direction] * h: horizontal line (vertical movement) * v: vertical line (horizontal movement) [sense] * i: invert (top-bottom -> bottom-top; left-right -> right:left) [repeat] * r: repeat (when reaches end, goes to the begining) * l: special loop (reaches end, inverts direction) [colour] * b: black line, white background * w: white line, black background