Texas Instruments Titanium TI-89 - Pxloff;On Catalog; Pxltest Catalog; Pxltext Catalog; Pxlvert Catalog

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 ¸