Texas Instruments PLUS TI-89 - Manual (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 ¸
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 ¸
TI-89: "
TI-92 Plus: ¥ "
PxlTest(25,50) ¸ true
PxlOff 25,50 ¸
TI-89: "
TI-92 Plus: ¥ "
PxlTest(25,50) ¸ false