Developing Drawing Strategies: Part 2 - AutoCAD 2011 and AutoCAD LT 2011: No Experience Required - page 187

You can now mirror the post and railing to draw them on the opposite side
of the stairway. You can't use the midpoint of the deck's perimeter line as one
point of the mirror line, because the stair is centered on the front door and not
on the deck. You can, however, use the midpoint of the front door's threshold.
1. Make sure 05A-FPLAY1.dwg is open.
2. Select the 4 ″ (102 mm) post and all three lines that make up the
handrail.
Try using a window selection (drag from left to right) to select the
objects rather than picking them one at a time.
3. Start the MIRROR command.
4. Use the Midpoint osnap and then specify the midpoint of the verti-
cal threshold line as the first point of the mirror line, as shown in
Figure 5.24.
FiGuRE 5.24 Using the midpoint of the threshold as the first mirror point
5. Move the cursor to the right; then click to specify the second point of
the mirror line. Press ↵ to retain the source objects.
Your deck should look like Figure 5.25.
6. Zoom in until you can see both stair handrails and posts.
7. Start the ARRAY command from the Home tab ➢ Modify panel.
The Array dialog box (Figure 5.26) appears, asking you to specify a
number of parameters about your array.