Texas Instruments TI-89 Voyage 200, User Manual

Page: 858 / 1008

858 Appendix A: Functions and Instructions
PxlOff
CATALOG
PxlOff
row
,
col
PxlOff
rowList
,
colList
Displays the Graph screen and turns off the pixel
at pixel coordinates (
row
,
col
).
Note : Regraphing erases all drawn items.
PxlHorz 25,1
¸
PxlOff 25,50
¸
25,50
PxlOn
CATALOG
PxlOn
row
,
col
PxlOn
rowList
,
colList
Displays the Graph screen and turns on the pixel
at pixel coordinates (
row
,
col
).
Note : Regraphing erases all drawn items.
PxlOn 25,50
¸
pxlTest()
CATALOG
pxlTest (
row
,
col
)
⇒ ⇒ ⇒ ⇒
Boolean expression
pxlTest (
rowList
,
colList
)
⇒ ⇒ ⇒ ⇒
Boolean expression
Returns
true
if the pixel at pixel coordinates (
row
,
col
) is on. Returns
false
if the pixel is off.
Note : Regraphing erases all drawn items.
PxlOn 25,50
¸
"
PxlTest(25,50)
¸
true
PxlOff 25,50
¸
"
PxlTest(25,50)
¸
false
PxlText
CATALOG
PxlText
string
,
row
,
col
Displays the Graph screen and places character
string
string
on the screen, starting at pixel
coordinates (
row
,
col
).
string
is positioned with the upper-left corner of
its first character at the coordinates.
Note : Regraphing erases all drawn items.
PxlText "sample text",20,10
¸
PxlVert
CATALOG
PxlVert
col
[ ,
drawMode
]
Draws a vertical line down the screen at pixel
position
col .
If drawMode = 1, draws the line (default).
If drawMode = 0, turns off the line.
If drawMode = -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
LineVert
.
PxlVert 50,1
¸