Learning ObjectivessevitcejbO
This chapter introduces a variety of fundamental drawing and editing concepts
and processes. You will learn to specify the location of points, draw lines, select
objects, and erase objects. You will also use basic drawing aids and explore several
other primary AutoCAD commands and operations.
Responding to Prompts Re s ponding to Prompt s
AutoCAD commands prompt, or ask, you to perform a specific task. For example, fi
when you draw a line, prompts ask you to specify line endpoints. When you erase
an object, a prompt asks you to select objects to erase. You must understand how to
respond to prompts before you begin drawing. Many prompts provide options that
you can select instead of responding to the immediate request. For example, after you
pick the first point of a line, a prompt asks you to select the next point, or you can fi
choose the
Undo
option to remove the previous selection.
Responding with Numbers
Many commands require you to enter specific numerical data, such as the location fi
of a point or the radius of a circle. Acceptable values vary depending on the command
and prompt. AutoCAD understands that a number is positive without the plus sign
(+) in front of the value. However, you must add a hyphen (-) in front of a negative
number, such as -6.375. Do not include a space when responding to a prompt, because
the space bar functions like
[Enter]
to enter the input.
79
Learning L L e a r n i i n n g g O b j e c t i v v e
After completing this chapter, you will be able to:
✓ Use Us e appropriate ap pr op ri at e values va lu es when w he n responding r n to promp om pt s.
✓ Apply basic viewing methods.
✓ Draw given objects using the
LINE
command.
✓ Describe and use several point entry methods.
✓ Describe and use basic drawing aids.
✓ Use the ERASE, UNDO,
O
U, REDO, and
O OOPS
commands.
✓ Create selection sets using various selection options.
Introduction to Drawing
and Editing
3 3