Texas Instruments TI-89 Manual Book page 500

PtOff
CATALOG
PtOff x, y
PtOff xList, yList
Displays the Graph screen and turns off the
screen pixel nearest to window coordinates
( , ).
x y
PtOn
CATALOG
PtOn x, y
PtOn xList, yList
Displays the Graph screen and turns on the
screen pixel nearest to window coordinates
( , ).
x y
ptTest()
CATALOG
ptTest (x, y)
ptTest (xList, yList)
Returns
screen pixel nearest to window coordinates
( , ) is on.
x y
PtText
CATALOG
PtText string, x, y
Displays the Graph screen and places the
character string
pixel nearest the specified (
coordinates.
is positioned with the upper-left corner
string
of its first character at the coordinates.
PxlChg
CATALOG
PxlChg row, col
PxlChg rowList, colList
Displays the Graph screen and reverses the
pixel at pixel coordinates (
Note: Regraphing erases all drawn items.
PxlCrcl
CATALOG
PxlCrcl row, col, r [, drawMode]
Displays the Graph screen and draws a circle
centered at pixel coordinates (
radius of
If
drawMode
If
drawMode
If
drawMode
circle.
Note: Regraphing erases all drawn items. See
also
Circle
Boolean constant expression
Boolean constant expression
or . Returns
true false true
on the screen at the
string
) window
x, y
,
row col
row
pixels.
r
= 1, draws the circle (default).
= 0, turns off the circle.
= -1, inverts pixels along the
.
PtOff 2,4 ¸
PtOn 3,5 ¸
ptTest(3,5) ¸
only if the
PtText "sample",3,5 ¸
PxlChg 2,4 ¸
).
PxlCrcl 40,80,30,1 ¸
TI-89:
TI-92 Plus:
¸
, ) with a
col
Appendix A: Functions and Instructions
PxlCrcl 50,125,40,1
true
483