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