Developing Drawing Strategies: Part 1 - AutoCAD 2011 and AutoCAD LT 2011: No Experience Required - page 150

FiGuRE 4.65 Using the Midpoint osnap to select the start point of the line
7. Move the cursor over the bottom jamb line and you'll notice the
Endpoint markers appear. The Endpoint running osnap is still active,
but typing in the first three letters of an osnap or clicking an osnap
option from the context menu overrides it.
Click the Midpoint Osnap option again, and move the cursor to the
bottom jamb line. When the triangle appears at that midpoint, click
again. Press ↵ to end the LINE command.
8. Start the OFFSET command, and enter 1.5 ↵ ( 38 ↵ ) to set the offset
distance. Pick the newly drawn line, and then pick a point anywhere
to the right side.
Then, while the OFFSET command is still running, pick the original
line again and pick another point in a blank area somewhere to the
left side of the doorway opening (see Figure 4.66). Press ↵ to end
the OFFSET command.
9. In the status bar, click the Ortho Mode button to turn it on (light
blue background). Ortho mode restricts the cursor to vertical and
horizontal movements only.
10. Start the LINE command choosing the Midpoint osnap option, and
then move the cursor near the midpoint of the left vertical line.
When the triangle marker appears at the midpoint, click to set the
endpoint of the line.