HP 40gs User Manual page 368

hp40g+.book Page 20 Friday, December 9, 2005 1:03 AM
BOX
ERASE
FREEZE
LINE
PIXOFF
PIXON
TLINE
21-20
Example
ARC 0;0;2;0;2π:
FREEZE:
Draws a circle centered
at (0,0) of radius 2. The
FREEZE command
causes the circle to
remain displayed on the screen until you press a key.
Draws a box with diagonally opposite corners (x1,y1) and
(x2,y2).
BOX x1;y1;x2;y2:
Example
BOX -1;-1;1;1:
FREEZE:
Draws a box, lower
corner at (–1,–1),
upper corner at (1,1)
Clears the display
ERASE:
Halts the program, freezing the current display.
Execution resumes when any key is pressed.
Draws a line from (x1, y1) to (x2, y2).
LINE x1;y1;x2;y2:
Turns off the pixel at the specified coordinates (x,y).
PIXOFF x;y:
Turns on the pixel at the specified coordinates (x,y).
PIXON x;y:
Toggles the pixels along the line from (x1, y1) to (x2, 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.
TLINE x1;y1;x2;y2:
Programming