Graphics Programs Reference
In-Depth Information
6.
Draw the arc defi ning the front edge of the chair (Figure 20.31). Use the Endpoint Osnap
override to pick the top endpoints of the chair legs as the endpoints of the arc. (If you
need help with the Arc command, refer to the section “Using the Layout” in Chapter 3,
“Setting Up and Using AutoCAD's Drafting Tools.”)
FIGURE 20.31
Drawing the front
and back seat edge
using arcs and a
polyline spline
Endpoint 1
Endpoint 2
Endpoint 2
Direction
Endpoint 1
Direction
Drawing the front arc
Drawing the back arc
The polyline spline
7.
Repeat steps 3 through 6 for the UCS named Back—each time using the top endpoints of
the legs for the endpoints of the arc.
8.
Restore the UCS for the side, but instead of drawing an arc, use the Polyline tool and
draw a polyline spline similar to the one in Figure 20.31. If you need help with polyline
splines, see Chapter 17, “Drawing Curves.”
Next, you'll mirror the side-edge spline to the opposite side. This will save you from having
to defi ne a UCS for that side:
1.
Click the World UCS tool on the Coordinates tool group of the Tool Sets palette to restore
the WCS. You do this because you want to mirror the arc along an axis that is parallel to
the plane of the WCS. Remember that you must use the coordinate system that defi nes
the plane in which you want to work.
2.
Click the polyline you drew for the side of the chair (the one drawn on the Side UCS).
3.
Click the Midpoint grip of the arc in the Side UCS; then right-click and choose Mirror
from the shortcut menu.
4.
Enter
C
↵ to select the Copy option.
5.
Enter
B
↵ to select a new base point for the mirror axis.
6.
At the Specify base point: prompt, use the Midpoint override to pick the midpoints
of the rectangle at the bottom of the model. Refer to Figure 20.32 for help. The polyline
should mirror to the opposite side, and your chair should look like Figure 20.33.
7.
Press the Esc key to clear the grips.
