Texas Instruments TI-89 Titanium - Page 229

Appendix A: Functions and Instructions 223
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.
@ PxlLine 50,15,20,90,1 ¸
H 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 ¸
@ "
H ¥ "
PxlTest(25,50)
¸ true
PxlOff 25,50
¸
@ "
H ¥ "
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
¸
H PxlText "sample
text",20,50
¸