2004

274 | Chapter 16 Draw Geometric Objects
4 Click the endpoint to lift the “pen” up so that you can move the cursor
around the screen without drawing. Click a new start point to resume
drawing from the new cursor position.
5 Enter r at any time to record (save) in the database the line you’re drawing
and those already drawn.
If the pen is down, you can continue drawing after recording. If the pen
is up, click to resume drawing. The freehand line starts from wherever the
cursor is when you click.
6 Press
ENTER to complete the sketch and record all unrecorded lines.
To erase freehand lines
1 While running the
SKETCH command, with the pen up or down, enter e
(Erase).
If the pen was down, it moves up.
2 Move the cursor to the end of the line you drew last and then move it back
as far along the line as you want to erase.
3 To end the erasure and return to the
SKETCH Command prompt, enter p.
To undo the erasure, enter e.
If you want to change the current viewport while sketching, make sure the
pen is up, all lines entered so far have been recorded, and Tablet mode is
off.
Draw Curved Objects
Curved objects are arcs, circles, polyline arcs, donuts, ellipses, and splines.
Draw Arcs
You can create arcs in several ways. With the exception of the first method,
arcs are drawn counterclockwise from the start point to the endpoint.
Draw Arcs by Specifying Three Points
You can draw an arc by specifying three points. In the following example, the
start point of the arc snaps to the endpoint of a line. The second point of the
arc snaps to the middle circle in the illustration.