Home / Autocad Tutorial / Using Point Filters to Finish the Deck

Using Point Filters to Finish the Deck

To complete the back deck, you need to align the center of the stair with the
center of the door. To do this, we’ll combine what you already know about object snaps with the STRETCH command and a feature named point filters. Point filters,also called coordinate filters, are tools that allow you to use only the X, Y, or Z value of a selected point in the drawing area.
For example, suppose you want to stretch an object to the center of a rectangle but you don’t know where that center is located. You could draw a bunch of construction lines, only to erase them in a few minutes, or you could forgo all of that with point filters. In this scenario, you would use the X point filter and pick the midpoint of a horizontal line from the rectangle; then you’d use the Y point filter and pick the midpoint of a vertical line from the rectangle.

The resulting location is at the intersection of the midpoints of the two sides of
the rectangle at the center point. More important, you didn’t spend any unnecessary
time drawing and then erasing construction lines. Let’s take a look at how
you can employ this same method to finish the back deck. Follow these steps:
1. Make sure I05-09-StretchDeck.dwg (M05-09-StretchDeck.dwg) is open.
2. Verify that Polar Tracking and Object Snap are still enabled, and then
turn on the Endpoint and Midpoint object snaps from the Drafting
Settings dialog box, as shown in Figure 5.32.

Using Point Filters to Finish the Deck 1
F igu re 5 . 3 2 : Enabling the Endpoint and Midpoint object snaps from the
Drafting Settings dialog box
3. Create a crossing selection window around the stairs, stair handrails,
and stair posts, as shown in Figure 5.33.

Using Point Filters to Finish the Deck 2

F igu re 5 . 3 3 : Select the stairs for the next STRETCH command.
4. At the Specify base point or: prompt, use the Midpoint osnap and
pick the midpoint of the top step.
5. At the Specify second point or: prompt, hold the Shift key down
and right-click to open the Osnap context menu. Choose Point
Filters ➢ .X (see Figure 5.34).

Using Point Filters to Finish the Deck 3
F igu re 5 . 3 4 : Select the X point filter from the Object Snap context menu

same location as the point you selected in step 4 and vertically (Y)
equal to the midpoint of the threshold.
The prompt in the command-line interface has .X appended to
indicate that AutoCAD will use only the X component of the next
location picked.
6. Click either endpoint of the top step. This point is in line with the
midpoint you picked in step 4, so the stretch will move the stairs vertically,
not horizontally.
Move the cursor around in the drawing area, and you’ll see that
the movement of the stairs is now restricted to the y-axis. In the
command-line interface, the notation (need YZ) is appended to the
prompt, indicating that AutoCAD will use only the Y and Z components
of the next location picked. (Only the y-axis is referenced if you
are using the Autodesk® AutoCAD LT® program.)
7. Click the Snap To Midpoint button in the Object Snap toolbar, and
then click the midpoint of the threshold (see Figure 5.35).

Using Point Filters to Finish the Deck 4
F igu re 5 . 3 5 : Select the midpoint of the threshold as the Y and Z
components of the second point.

8. The stairs are moved vertically and centered on the back door. Zoom
to the drawing’s extents. Your drawing should look like Figure 5.36.

Using Point Filters to Finish the Deck 5
F igu re 5 . 3 6 : The cabin after completing the back deck
9. Save your file as I05-10-PointFilter.dwg (M05-10-PointFilter.dwg).

Leave a Reply

Your email address will not be published. Required fields are marked *