HP 39g Graphing Calculator - Manual (Page 228)

FREEZE
LINE
PIXOFF
PIXON
TUNE
Halts the program, freezing the curi'ent display. Execution
resumes when any key is pressed.
Draws a line from (.i7, yl) to (.v2, y2).
LINE A7;y7;x2;y2;
Turns off the pixel at the specified coordinates (x,y).
PIXOFF A ;y:
Turns on the pixel at the specified coordinates (x,y).
PIXON a ;>’:
Toggles the pixels along the line from
( a /,
yl) to ( a 2, y2) on
and off. Any pixel that was turned off, is turned on; any pixel
that was turned on, is turned off. TLINE can be used to erase
a line.
T h l N E
xl ;yl ;x2;y2:
Example
TLINE 0 ; 0 ; 3 ; 3 :
Erases previously drawn 45 degree line from (0,0) to
(3,3), or draws that line if it doesn’t already exist.
Graphic commands
The Graphic commands use the graphics variables GO through
G9—or the Page variable from Sketch—as graphicname
arguments. The position argument takes the form
( a , v ).
Position coordinates depend on the cun'ent aplet's scale,
which is specified by Xmin, Xmax, Ymin, and Ymax. The
upper left comer of the target graphic {graphic!) is at
(Xmin, Ymax).
You can capture the current display and store it in GO by
simultaneously pressing
fONl+| PLOT|.
DISPLAY-^
^DISPLAY
Stores the current display in graphicname.
DISPLAY—> graphicname
Displays graphic from graphicname in the display.
—^DISPLAY graphicname
15-20 Programming