Radio Shack TRS-80 Operation Manual page 31

Computer Graphics Operation Manual
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LINE
Draws a Line or Box
LINE draws a line from the starting point (xl,yl) to the
ending point (x2,y2).
If the starting point is omitted, either (~,~) is used if a
previous end coordinate has not been specified or the last
ending point of the previous command is used. If one or both
parameters are off the screen, only the part of the line
which is visible is displayed.
With over 65,5~~ line styles possible, each style is
slightly different. You'll find it's almost impossible to
detect some of the differences since they are so minute.
LINE with Box Option
The start and end coordinates are the diagonal
coordinates of the box (either a square or rectangle). When
you don't specify the B or BF options, the "diagonal"
line is drawn. When you specify the B option, the
perimeter is drawn but not the diagonal line. When you
specify the BF option, the perimeter is drawn, and the
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