HP 48g Graphing Calculator - Manual (Page 111)

Turning Pixels On and Off
Two operations, D O T + a n d D Û T - . allow you to selectively turn
pixels on and off. If one of these keys is active, it displays a “bullet”
(ii) in its label.
■ If there is a ™ in the D O T + label, pixels under the cursor are
turned on.
■ If there is a ü in the D O T - label, pixels under the cursor are
turned off.
Adding Elements Using the Graphics Environment
The Picture Editor allows уюи to add three geometric elements—line
segments, boxes, and circles—to your grob:
Each of these elements requires two cursor positions. This means that
you must tell the Editor to remember the first cursor position while
you move to the second. You do this by marking the first position.
To mark the current cursor position;
■ Press MfiFiK from the second page of the Picture Editor menu
or Q. Press ITFlRK or again to remove the mark. Also, any
operation that reijuires a mark will create a mark when you first
press its key, and then execute the operation when you press its key
a second time.
To draw a line segment on the current grob:
1. From within the Picture Editor, move the cursor to where you want
one endpoint of the segment.
2. Press Q (or M A R K o r L I N E ).
3. Move the cursor to the other endpoint and press L I N E .
To draw a box on the current grob:
1. From within the Picture Editor, move the cursor to where you want
one comer of the box.
2. Press Q (or M A R R or B O N ).
3. Move the cursor to the opposite corner of the desired box and press
BON .
Graphic Objects 9-3