810 Appendix A: Functions and Instructions
Line CATALOG
Line
xStart
,
yStart
,
xEnd
,
yEnd
[,
drawMode
]
Displays the Graph screen and draws, erases, or
inverts a line segment between the window
coordinates (
xStart
,
yStart
) and (
xEnd
,
yEnd
),
including both endpoints.
If
drawMode
= 1, draws the line (default).
If
drawMode
= 0, turns off the line.
If
drawMode
=
ë
1, turns a line that is on to off or off
to on (inverts pixels along the line).
Note: Regraphing erases all drawn items. See also
PxlLine
.
In the
ZoomStd
window, draw a line and then
erase it.
Line 0,0,6,9
¸
@ "
H ¥ "
Line 0,0,6,9,0
¸
LineHorz CATALOG
LineHorz
y
[,
drawMode
]
Displays the Graph screen and draws, erases, or
inverts a horizontal line at window position
y
.
If
drawMode
= 1, draws the line (default).
If
drawMode
= 0, turns off the line.
If
drawMode
=
ë
1, turns a line that is on to off or off
to on (inverts pixels along the line).
Note: Regraphing erases all drawn items. See also
PxlHorz
.
In a
ZoomStd
window:
LineHorz 2.5 ¸
LineTan CATALOG
LineTan
expression1
,
expression2
Displays the Graph screen and draws a line tangent
to
expression1
at the point specified.
expression1
is an expression or the name of a
function, where
x
is assumed to be the independent
variable, and
expression2
is the
x
value of the point
that is tangent.
Note: In the example shown,
expression1
is graphed
separately.
LineTan
does not graph
expression1.
In function graphing mode and a
ZoomTrig
window:
Graph cos(x)
@ "
H ¥ "
LineTan cos(x),p/4
¸
LineVert CATALOG
LineVert
x
[,
drawMode
]
Displays the Graph screen and draws, erases, or
inverts a vertical line at window position
x
.
If
drawMode
= 1, draws the line (default).
If
drawMode
= 0, turns off the line.
If
drawMode
=
ë
1, turns a line that is on to off or off
to on (inverts pixels along the line).
Note: Regraphing erases all drawn items. See also
PxlVert
.
In a
ZoomStd
window:
LineVert ë 2.5
¸
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