Texas Instruments TI-89 - Page 501

484 Appendix A: Functions and Instructions
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 484 of 132
PxlHorz
CATALOG
PxlHorz
row
[
,
drawMode
]
Displays the Graph screen and draws a
horizontal line at pixel position
row
.
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
LineHorz
.
PxlHorz 25,1
¸
PxlLine
CATALOG
PxlLine
rowStart
,
colStart
,
rowEnd
,
colEnd
[
,
drawMode
]
Displays the Graph screen and draws a line
between pixel coordinates (
rowStart
,
colStart
)
and (
rowEnd
,
colEnd
), including both
endpoints.
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
Line.
TI-89:
PxlLine 50,15,20,90,1
¸
TI-92 Plus:
PxlLine 80,20,30,150,1
¸
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
¸
Px
l
Off 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
¸
TI-89:
"
TI-92 Plus:
¥"
PxlTest(25,50)
¸
true
PxlOff 25,50
¸
TI-89:
"
TI-92 Plus:
¥"
PxlTest(25,50)
¸
false