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should have a straight angle traced by a horizontal and a vertical segments.
The cursor is still active. To deactivate it, without moving it at all, press @LINE.
The cursor returns to its normal shape (a cross) and the LINE function is no
longer active.
TLINE
(Toggle LINE) Move the cursor to the second quadrant to see this function in
action. Press @TLINE. A MARK is placed at the start of the toggle line. Move
the cursor with the arrow keys away from this point, and press @TLINE. A line is
drawn from the current cursor position to the reference point selected earlier.
Pixels that are on in the line path will be turned off, and vice versa. To remove
the most recent line traced, press @TLINE again. To deactivate TLINE, move the
cursor to the original point where TLINE was activated, and press @LINE @LINE.
BOX
This command is used to draw a box in the graph. Move the cursor to a clear
area of the graph, and press @BOX@. This highlights the cursor. Move the cursor
with the arrow keys to a point away, and in a diagonal direction, from the
current cursor position. Press @BOX@ again. A rectangle is drawn whose
diagonal joins the initial and ending cursor positions. The initial position of the
box is still marked with and x. Moving the cursor to another position and
pressing @BOX@ will generate a new box containing the initial point. To deselect
BOX, move the cursor to the original point where BOX was activated, then press
@LINE @LINE.
CIRCL
This command produces a circle. Mark the center of the circle with a MARK
command, then move the cursor to a point that will be part of the periphery of
the circle, and press @CIRCL. To deactivate CIRCL, return the cursor to the
MARK position and press @LINE.
Try this command by moving the cursor to a clear part of the graph, press @MARK.
Move the cursor to another point, then press @CIRCL. A circle centered at the
MARK, and passing through the last point will be drawn.
LABEL
Pressing @LABEL places the labels in the x- and y-axes of the current plot. This
feature has been used extensively through this chapter.