Texas Instruments PLUS TI-89 - Manual (Page 500)

Appendix A: Functions and Instructions 483
8992APPA.DOC TI-89 / TI-92 Plus: Appendix A (US English) Susan Gullord Revised: 02/23/01 1:48 PM Printed: 02/23/01 2:21 PM Page 483 of 132
PtOff CATALOG
PtOff x , y
PtOff xList , yList
Displays the Graph screen and turns off the
screen pixel nearest to window coordinates
(
x , y ).
PtOff 2,4 ¸
PtOn CATALOG
PtOn x , y
PtOn xList , yList
Displays the Graph screen and turns on the
screen pixel nearest to window coordinates
(
x , y ).
PtOn 3,5 ¸
ptTest() CATALOG
ptTest ( x , y ) ⇒
Boolean constant expression
ptTest ( xList , yList ) ⇒ Boolean constant expression
Returns true or false . Returns true only if the
screen pixel nearest to window coordinates
(
x , y ) is on.
ptTest(3,5) ¸ true
PtText CATALOG
PtText string , x , y
Displays the Graph screen and places the
character string
string on the screen at the
pixel nearest the specified ( x, y ) window
coordinates.
string is positioned with the upper-left corner
of its first character at the coordinates.
PtText "sample",3,5 ¸
PxlChg CATALOG
PxlChg row , col
PxlChg rowList , colList
Displays the Graph screen and reverses the
pixel at pixel coordinates (
row , col ).
Note : Regraphing erases all drawn items.
PxlChg 2,4 ¸
PxlCrcl CATALOG
PxlCrcl row , col , r [, drawMode ]
Displays the Graph screen and draws a circle
centered at pixel coordinates (
row , col ) with a
radius of r pixels.
If drawMode = 1, draws the circle (default).
If drawMode = 0, turns off the circle.
If drawMode = -1, inverts pixels along the
circle.
Note : Regraphing erases all drawn items. See
also Circle .
TI-89: PxlCrcl 40,80,30,1 ¸
TI-92 Plus: PxlCrcl 50,125,40,1
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